Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_SCHED_H |
2 | #define _LINUX_SCHED_H | |
3 | ||
607ca46e | 4 | #include <uapi/linux/sched.h> |
b7b3c76a | 5 | |
5c228079 DY |
6 | #include <linux/sched/prio.h> |
7 | ||
b7b3c76a DW |
8 | |
9 | struct sched_param { | |
10 | int sched_priority; | |
11 | }; | |
12 | ||
1da177e4 LT |
13 | #include <asm/param.h> /* for HZ */ |
14 | ||
1da177e4 LT |
15 | #include <linux/capability.h> |
16 | #include <linux/threads.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/timex.h> | |
20 | #include <linux/jiffies.h> | |
fb00aca4 | 21 | #include <linux/plist.h> |
1da177e4 LT |
22 | #include <linux/rbtree.h> |
23 | #include <linux/thread_info.h> | |
24 | #include <linux/cpumask.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/nodemask.h> | |
c92ff1bd | 27 | #include <linux/mm_types.h> |
00d1a39e | 28 | #include <linux/preempt_mask.h> |
1da177e4 | 29 | |
1da177e4 LT |
30 | #include <asm/page.h> |
31 | #include <asm/ptrace.h> | |
bfc3f028 | 32 | #include <linux/cputime.h> |
1da177e4 LT |
33 | |
34 | #include <linux/smp.h> | |
35 | #include <linux/sem.h> | |
36 | #include <linux/signal.h> | |
1da177e4 LT |
37 | #include <linux/compiler.h> |
38 | #include <linux/completion.h> | |
39 | #include <linux/pid.h> | |
40 | #include <linux/percpu.h> | |
41 | #include <linux/topology.h> | |
3e26c149 | 42 | #include <linux/proportions.h> |
1da177e4 | 43 | #include <linux/seccomp.h> |
e56d0903 | 44 | #include <linux/rcupdate.h> |
05725f7e | 45 | #include <linux/rculist.h> |
23f78d4a | 46 | #include <linux/rtmutex.h> |
1da177e4 | 47 | |
a3b6714e DW |
48 | #include <linux/time.h> |
49 | #include <linux/param.h> | |
50 | #include <linux/resource.h> | |
51 | #include <linux/timer.h> | |
52 | #include <linux/hrtimer.h> | |
7c3ab738 | 53 | #include <linux/task_io_accounting.h> |
9745512c | 54 | #include <linux/latencytop.h> |
9e2b2dc4 | 55 | #include <linux/cred.h> |
fa14ff4a | 56 | #include <linux/llist.h> |
7b44ab97 | 57 | #include <linux/uidgid.h> |
21caf2fc | 58 | #include <linux/gfp.h> |
a3b6714e DW |
59 | |
60 | #include <asm/processor.h> | |
36d57ac4 | 61 | |
d50dde5a DF |
62 | #define SCHED_ATTR_SIZE_VER0 48 /* sizeof first published struct */ |
63 | ||
64 | /* | |
65 | * Extended scheduling parameters data structure. | |
66 | * | |
67 | * This is needed because the original struct sched_param can not be | |
68 | * altered without introducing ABI issues with legacy applications | |
69 | * (e.g., in sched_getparam()). | |
70 | * | |
71 | * However, the possibility of specifying more than just a priority for | |
72 | * the tasks may be useful for a wide variety of application fields, e.g., | |
73 | * multimedia, streaming, automation and control, and many others. | |
74 | * | |
75 | * This variant (sched_attr) is meant at describing a so-called | |
76 | * sporadic time-constrained task. In such model a task is specified by: | |
77 | * - the activation period or minimum instance inter-arrival time; | |
78 | * - the maximum (or average, depending on the actual scheduling | |
79 | * discipline) computation time of all instances, a.k.a. runtime; | |
80 | * - the deadline (relative to the actual activation time) of each | |
81 | * instance. | |
82 | * Very briefly, a periodic (sporadic) task asks for the execution of | |
83 | * some specific computation --which is typically called an instance-- | |
84 | * (at most) every period. Moreover, each instance typically lasts no more | |
85 | * than the runtime and must be completed by time instant t equal to | |
86 | * the instance activation time + the deadline. | |
87 | * | |
88 | * This is reflected by the actual fields of the sched_attr structure: | |
89 | * | |
90 | * @size size of the structure, for fwd/bwd compat. | |
91 | * | |
92 | * @sched_policy task's scheduling policy | |
93 | * @sched_flags for customizing the scheduler behaviour | |
94 | * @sched_nice task's nice value (SCHED_NORMAL/BATCH) | |
95 | * @sched_priority task's static priority (SCHED_FIFO/RR) | |
96 | * @sched_deadline representative of the task's deadline | |
97 | * @sched_runtime representative of the task's runtime | |
98 | * @sched_period representative of the task's period | |
99 | * | |
100 | * Given this task model, there are a multiplicity of scheduling algorithms | |
101 | * and policies, that can be used to ensure all the tasks will make their | |
102 | * timing constraints. | |
aab03e05 DF |
103 | * |
104 | * As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the | |
105 | * only user of this new interface. More information about the algorithm | |
106 | * available in the scheduling class file or in Documentation/. | |
d50dde5a DF |
107 | */ |
108 | struct sched_attr { | |
109 | u32 size; | |
110 | ||
111 | u32 sched_policy; | |
112 | u64 sched_flags; | |
113 | ||
114 | /* SCHED_NORMAL, SCHED_BATCH */ | |
115 | s32 sched_nice; | |
116 | ||
117 | /* SCHED_FIFO, SCHED_RR */ | |
118 | u32 sched_priority; | |
119 | ||
120 | /* SCHED_DEADLINE */ | |
121 | u64 sched_runtime; | |
122 | u64 sched_deadline; | |
123 | u64 sched_period; | |
124 | }; | |
125 | ||
1da177e4 | 126 | struct exec_domain; |
c87e2837 | 127 | struct futex_pi_state; |
286100a6 | 128 | struct robust_list_head; |
bddd87c7 | 129 | struct bio_list; |
5ad4e53b | 130 | struct fs_struct; |
cdd6c482 | 131 | struct perf_event_context; |
73c10101 | 132 | struct blk_plug; |
c4ad8f98 | 133 | struct filename; |
1da177e4 | 134 | |
615d6e87 DB |
135 | #define VMACACHE_BITS 2 |
136 | #define VMACACHE_SIZE (1U << VMACACHE_BITS) | |
137 | #define VMACACHE_MASK (VMACACHE_SIZE - 1) | |
138 | ||
1da177e4 LT |
139 | /* |
140 | * These are the constant used to fake the fixed-point load-average | |
141 | * counting. Some notes: | |
142 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
143 | * a load-average precision of 10 bits integer + 11 bits fractional | |
144 | * - if you want to count load-averages more often, you need more | |
145 | * precision, or rounding will get you. With 2-second counting freq, | |
146 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
147 | * 11 bit fractions. | |
148 | */ | |
149 | extern unsigned long avenrun[]; /* Load averages */ | |
2d02494f | 150 | extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); |
1da177e4 LT |
151 | |
152 | #define FSHIFT 11 /* nr of bits of precision */ | |
153 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 154 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
155 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
156 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
157 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
158 | ||
159 | #define CALC_LOAD(load,exp,n) \ | |
160 | load *= exp; \ | |
161 | load += n*(FIXED_1-exp); \ | |
162 | load >>= FSHIFT; | |
163 | ||
164 | extern unsigned long total_forks; | |
165 | extern int nr_threads; | |
1da177e4 LT |
166 | DECLARE_PER_CPU(unsigned long, process_counts); |
167 | extern int nr_processes(void); | |
168 | extern unsigned long nr_running(void); | |
1da177e4 | 169 | extern unsigned long nr_iowait(void); |
8c215bd3 | 170 | extern unsigned long nr_iowait_cpu(int cpu); |
69d25870 AV |
171 | extern unsigned long this_cpu_load(void); |
172 | ||
173 | ||
0f004f5a | 174 | extern void calc_global_load(unsigned long ticks); |
5aaa0b7a | 175 | extern void update_cpu_load_nohz(void); |
1da177e4 | 176 | |
7e49fcce SR |
177 | extern unsigned long get_parent_ip(unsigned long addr); |
178 | ||
b637a328 PM |
179 | extern void dump_cpu_task(int cpu); |
180 | ||
43ae34cb IM |
181 | struct seq_file; |
182 | struct cfs_rq; | |
4cf86d77 | 183 | struct task_group; |
43ae34cb IM |
184 | #ifdef CONFIG_SCHED_DEBUG |
185 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
186 | extern void proc_sched_set_task(struct task_struct *p); | |
187 | extern void | |
5cef9eca | 188 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
43ae34cb | 189 | #endif |
1da177e4 | 190 | |
4a8342d2 LT |
191 | /* |
192 | * Task state bitmask. NOTE! These bits are also | |
193 | * encoded in fs/proc/array.c: get_task_state(). | |
194 | * | |
195 | * We have two separate sets of flags: task->state | |
196 | * is about runnability, while task->exit_state are | |
197 | * about the task exiting. Confusing, but this way | |
198 | * modifying one set can't modify the other one by | |
199 | * mistake. | |
200 | */ | |
1da177e4 LT |
201 | #define TASK_RUNNING 0 |
202 | #define TASK_INTERRUPTIBLE 1 | |
203 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
204 | #define __TASK_STOPPED 4 |
205 | #define __TASK_TRACED 8 | |
4a8342d2 | 206 | /* in tsk->exit_state */ |
ad86622b ON |
207 | #define EXIT_DEAD 16 |
208 | #define EXIT_ZOMBIE 32 | |
abd50b39 | 209 | #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) |
4a8342d2 | 210 | /* in tsk->state again */ |
af927232 | 211 | #define TASK_DEAD 64 |
f021a3c2 | 212 | #define TASK_WAKEKILL 128 |
e9c84311 | 213 | #define TASK_WAKING 256 |
f2530dc7 TG |
214 | #define TASK_PARKED 512 |
215 | #define TASK_STATE_MAX 1024 | |
f021a3c2 | 216 | |
ad0f614e | 217 | #define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWP" |
73342151 | 218 | |
e1781538 PZ |
219 | extern char ___assert_task_state[1 - 2*!!( |
220 | sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; | |
f021a3c2 MW |
221 | |
222 | /* Convenience macros for the sake of set_task_state */ | |
223 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
224 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
225 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 226 | |
92a1f4bc MW |
227 | /* Convenience macros for the sake of wake_up */ |
228 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 229 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
230 | |
231 | /* get_task_state() */ | |
232 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 | 233 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
74e37200 | 234 | __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD) |
92a1f4bc | 235 | |
f021a3c2 MW |
236 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
237 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
92a1f4bc | 238 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 239 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 240 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 241 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
376fede8 | 242 | (task->flags & PF_FROZEN) == 0) |
1da177e4 LT |
243 | |
244 | #define __set_task_state(tsk, state_value) \ | |
245 | do { (tsk)->state = (state_value); } while (0) | |
246 | #define set_task_state(tsk, state_value) \ | |
247 | set_mb((tsk)->state, (state_value)) | |
248 | ||
498d0c57 AM |
249 | /* |
250 | * set_current_state() includes a barrier so that the write of current->state | |
251 | * is correctly serialised wrt the caller's subsequent test of whether to | |
252 | * actually sleep: | |
253 | * | |
254 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
255 | * if (do_i_need_to_sleep()) | |
256 | * schedule(); | |
257 | * | |
258 | * If the caller does not need such serialisation then use __set_current_state() | |
259 | */ | |
1da177e4 LT |
260 | #define __set_current_state(state_value) \ |
261 | do { current->state = (state_value); } while (0) | |
262 | #define set_current_state(state_value) \ | |
263 | set_mb(current->state, (state_value)) | |
264 | ||
265 | /* Task command name length */ | |
266 | #define TASK_COMM_LEN 16 | |
267 | ||
1da177e4 LT |
268 | #include <linux/spinlock.h> |
269 | ||
270 | /* | |
271 | * This serializes "schedule()" and also protects | |
272 | * the run-queue from deletions/modifications (but | |
273 | * _adding_ to the beginning of the run-queue has | |
274 | * a separate lock). | |
275 | */ | |
276 | extern rwlock_t tasklist_lock; | |
277 | extern spinlock_t mmlist_lock; | |
278 | ||
36c8b586 | 279 | struct task_struct; |
1da177e4 | 280 | |
db1466b3 PM |
281 | #ifdef CONFIG_PROVE_RCU |
282 | extern int lockdep_tasklist_lock_is_held(void); | |
283 | #endif /* #ifdef CONFIG_PROVE_RCU */ | |
284 | ||
1da177e4 LT |
285 | extern void sched_init(void); |
286 | extern void sched_init_smp(void); | |
2d07b255 | 287 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
36c8b586 | 288 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 289 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 | 290 | |
89f19f04 | 291 | extern int runqueue_is_locked(int cpu); |
017730c1 | 292 | |
3451d024 | 293 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) |
c1cc017c | 294 | extern void nohz_balance_enter_idle(int cpu); |
69e1e811 | 295 | extern void set_cpu_sd_state_idle(void); |
6201b4d6 | 296 | extern int get_nohz_timer_target(int pinned); |
46cb4b7c | 297 | #else |
c1cc017c | 298 | static inline void nohz_balance_enter_idle(int cpu) { } |
fdaabd80 | 299 | static inline void set_cpu_sd_state_idle(void) { } |
6201b4d6 VK |
300 | static inline int get_nohz_timer_target(int pinned) |
301 | { | |
302 | return smp_processor_id(); | |
303 | } | |
46cb4b7c | 304 | #endif |
1da177e4 | 305 | |
e59e2ae2 | 306 | /* |
39bc89fd | 307 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
308 | */ |
309 | extern void show_state_filter(unsigned long state_filter); | |
310 | ||
311 | static inline void show_state(void) | |
312 | { | |
39bc89fd | 313 | show_state_filter(0); |
e59e2ae2 IM |
314 | } |
315 | ||
1da177e4 LT |
316 | extern void show_regs(struct pt_regs *); |
317 | ||
318 | /* | |
319 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
320 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
321 | * trace (or NULL if the entire call-chain of the task should be shown). | |
322 | */ | |
323 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
324 | ||
325 | void io_schedule(void); | |
326 | long io_schedule_timeout(long timeout); | |
327 | ||
328 | extern void cpu_init (void); | |
329 | extern void trap_init(void); | |
330 | extern void update_process_times(int user); | |
331 | extern void scheduler_tick(void); | |
332 | ||
82a1fcb9 IM |
333 | extern void sched_show_task(struct task_struct *p); |
334 | ||
19cc36c0 | 335 | #ifdef CONFIG_LOCKUP_DETECTOR |
8446f1d3 | 336 | extern void touch_softlockup_watchdog(void); |
d6ad3e28 | 337 | extern void touch_softlockup_watchdog_sync(void); |
04c9167f | 338 | extern void touch_all_softlockup_watchdogs(void); |
332fbdbc DZ |
339 | extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, |
340 | void __user *buffer, | |
341 | size_t *lenp, loff_t *ppos); | |
9c44bc03 | 342 | extern unsigned int softlockup_panic; |
004417a6 | 343 | void lockup_detector_init(void); |
8446f1d3 | 344 | #else |
8446f1d3 IM |
345 | static inline void touch_softlockup_watchdog(void) |
346 | { | |
347 | } | |
d6ad3e28 JW |
348 | static inline void touch_softlockup_watchdog_sync(void) |
349 | { | |
350 | } | |
04c9167f JF |
351 | static inline void touch_all_softlockup_watchdogs(void) |
352 | { | |
353 | } | |
004417a6 PZ |
354 | static inline void lockup_detector_init(void) |
355 | { | |
356 | } | |
8446f1d3 IM |
357 | #endif |
358 | ||
8b414521 MT |
359 | #ifdef CONFIG_DETECT_HUNG_TASK |
360 | void reset_hung_task_detector(void); | |
361 | #else | |
362 | static inline void reset_hung_task_detector(void) | |
363 | { | |
364 | } | |
365 | #endif | |
366 | ||
1da177e4 LT |
367 | /* Attach to any functions which should be ignored in wchan output. */ |
368 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
369 | |
370 | /* Linker adds these: start and end of __sched functions */ | |
371 | extern char __sched_text_start[], __sched_text_end[]; | |
372 | ||
1da177e4 LT |
373 | /* Is this address in the __sched functions? */ |
374 | extern int in_sched_functions(unsigned long addr); | |
375 | ||
376 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
b3c97528 | 377 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 378 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 379 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 380 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
1da177e4 | 381 | asmlinkage void schedule(void); |
c5491ea7 | 382 | extern void schedule_preempt_disabled(void); |
1da177e4 | 383 | |
ab516013 | 384 | struct nsproxy; |
acce292c | 385 | struct user_namespace; |
1da177e4 | 386 | |
efc1a3b1 DH |
387 | #ifdef CONFIG_MMU |
388 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1da177e4 LT |
389 | extern unsigned long |
390 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
391 | unsigned long, unsigned long); | |
392 | extern unsigned long | |
393 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
394 | unsigned long len, unsigned long pgoff, | |
395 | unsigned long flags); | |
efc1a3b1 DH |
396 | #else |
397 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} | |
398 | #endif | |
1da177e4 | 399 | |
d049f74f KC |
400 | #define SUID_DUMP_DISABLE 0 /* No setuid dumping */ |
401 | #define SUID_DUMP_USER 1 /* Dump as user of process */ | |
402 | #define SUID_DUMP_ROOT 2 /* Dump as root */ | |
403 | ||
6c5d5238 | 404 | /* mm flags */ |
f8af4da3 | 405 | |
7288e118 | 406 | /* for SUID_DUMP_* above */ |
3cb4a0bb | 407 | #define MMF_DUMPABLE_BITS 2 |
f8af4da3 | 408 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
3cb4a0bb | 409 | |
942be387 ON |
410 | extern void set_dumpable(struct mm_struct *mm, int value); |
411 | /* | |
412 | * This returns the actual value of the suid_dumpable flag. For things | |
413 | * that are using this for checking for privilege transitions, it must | |
414 | * test against SUID_DUMP_USER rather than treating it as a boolean | |
415 | * value. | |
416 | */ | |
417 | static inline int __get_dumpable(unsigned long mm_flags) | |
418 | { | |
419 | return mm_flags & MMF_DUMPABLE_MASK; | |
420 | } | |
421 | ||
422 | static inline int get_dumpable(struct mm_struct *mm) | |
423 | { | |
424 | return __get_dumpable(mm->flags); | |
425 | } | |
426 | ||
3cb4a0bb KH |
427 | /* coredump filter bits */ |
428 | #define MMF_DUMP_ANON_PRIVATE 2 | |
429 | #define MMF_DUMP_ANON_SHARED 3 | |
430 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
431 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 432 | #define MMF_DUMP_ELF_HEADERS 6 |
e575f111 KM |
433 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
434 | #define MMF_DUMP_HUGETLB_SHARED 8 | |
f8af4da3 | 435 | |
3cb4a0bb | 436 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
e575f111 | 437 | #define MMF_DUMP_FILTER_BITS 7 |
3cb4a0bb KH |
438 | #define MMF_DUMP_FILTER_MASK \ |
439 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
440 | #define MMF_DUMP_FILTER_DEFAULT \ | |
e575f111 | 441 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
656eb2cd RM |
442 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
443 | ||
444 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS | |
445 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) | |
446 | #else | |
447 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 | |
448 | #endif | |
f8af4da3 HD |
449 | /* leave room for more dump flags */ |
450 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ | |
ba76149f | 451 | #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ |
bafb282d | 452 | #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */ |
f8af4da3 | 453 | |
9f68f672 ON |
454 | #define MMF_HAS_UPROBES 19 /* has uprobes */ |
455 | #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */ | |
f8ac4ec9 | 456 | |
f8af4da3 | 457 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) |
6c5d5238 | 458 | |
1da177e4 LT |
459 | struct sighand_struct { |
460 | atomic_t count; | |
461 | struct k_sigaction action[_NSIG]; | |
462 | spinlock_t siglock; | |
b8fceee1 | 463 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
464 | }; |
465 | ||
0e464814 | 466 | struct pacct_struct { |
f6ec29a4 KK |
467 | int ac_flag; |
468 | long ac_exitcode; | |
0e464814 | 469 | unsigned long ac_mem; |
77787bfb KK |
470 | cputime_t ac_utime, ac_stime; |
471 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
472 | }; |
473 | ||
42c4ab41 SG |
474 | struct cpu_itimer { |
475 | cputime_t expires; | |
476 | cputime_t incr; | |
8356b5f9 SG |
477 | u32 error; |
478 | u32 incr_error; | |
42c4ab41 SG |
479 | }; |
480 | ||
d37f761d FW |
481 | /** |
482 | * struct cputime - snaphsot of system and user cputime | |
483 | * @utime: time spent in user mode | |
484 | * @stime: time spent in system mode | |
485 | * | |
486 | * Gathers a generic snapshot of user and system time. | |
487 | */ | |
488 | struct cputime { | |
489 | cputime_t utime; | |
490 | cputime_t stime; | |
491 | }; | |
492 | ||
f06febc9 FM |
493 | /** |
494 | * struct task_cputime - collected CPU time counts | |
495 | * @utime: time spent in user mode, in &cputime_t units | |
496 | * @stime: time spent in kernel mode, in &cputime_t units | |
497 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds | |
5ce73a4a | 498 | * |
d37f761d FW |
499 | * This is an extension of struct cputime that includes the total runtime |
500 | * spent by the task from the scheduler point of view. | |
501 | * | |
502 | * As a result, this structure groups together three kinds of CPU time | |
503 | * that are tracked for threads and thread groups. Most things considering | |
f06febc9 FM |
504 | * CPU time want to group these counts together and treat all three |
505 | * of them in parallel. | |
506 | */ | |
507 | struct task_cputime { | |
508 | cputime_t utime; | |
509 | cputime_t stime; | |
510 | unsigned long long sum_exec_runtime; | |
511 | }; | |
512 | /* Alternate field names when used to cache expirations. */ | |
513 | #define prof_exp stime | |
514 | #define virt_exp utime | |
515 | #define sched_exp sum_exec_runtime | |
516 | ||
4cd4c1b4 PZ |
517 | #define INIT_CPUTIME \ |
518 | (struct task_cputime) { \ | |
64861634 MS |
519 | .utime = 0, \ |
520 | .stime = 0, \ | |
4cd4c1b4 PZ |
521 | .sum_exec_runtime = 0, \ |
522 | } | |
523 | ||
a233f112 PZ |
524 | #ifdef CONFIG_PREEMPT_COUNT |
525 | #define PREEMPT_DISABLED (1 + PREEMPT_ENABLED) | |
526 | #else | |
527 | #define PREEMPT_DISABLED PREEMPT_ENABLED | |
528 | #endif | |
529 | ||
c99e6efe PZ |
530 | /* |
531 | * Disable preemption until the scheduler is running. | |
532 | * Reset by start_kernel()->sched_init()->init_idle(). | |
d86ee480 PZ |
533 | * |
534 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working | |
535 | * before the scheduler is active -- see should_resched(). | |
c99e6efe | 536 | */ |
a233f112 | 537 | #define INIT_PREEMPT_COUNT (PREEMPT_DISABLED + PREEMPT_ACTIVE) |
c99e6efe | 538 | |
f06febc9 | 539 | /** |
4cd4c1b4 PZ |
540 | * struct thread_group_cputimer - thread group interval timer counts |
541 | * @cputime: thread group interval timers. | |
542 | * @running: non-zero when there are timers running and | |
543 | * @cputime receives updates. | |
544 | * @lock: lock for fields in this struct. | |
f06febc9 FM |
545 | * |
546 | * This structure contains the version of task_cputime, above, that is | |
4cd4c1b4 | 547 | * used for thread group CPU timer calculations. |
f06febc9 | 548 | */ |
4cd4c1b4 PZ |
549 | struct thread_group_cputimer { |
550 | struct task_cputime cputime; | |
551 | int running; | |
ee30a7b2 | 552 | raw_spinlock_t lock; |
f06febc9 | 553 | }; |
f06febc9 | 554 | |
4714d1d3 | 555 | #include <linux/rwsem.h> |
5091faa4 MG |
556 | struct autogroup; |
557 | ||
1da177e4 | 558 | /* |
e815f0a8 | 559 | * NOTE! "signal_struct" does not have its own |
1da177e4 LT |
560 | * locking, because a shared signal_struct always |
561 | * implies a shared sighand_struct, so locking | |
562 | * sighand_struct is always a proper superset of | |
563 | * the locking of signal_struct. | |
564 | */ | |
565 | struct signal_struct { | |
ea6d290c | 566 | atomic_t sigcnt; |
1da177e4 | 567 | atomic_t live; |
b3ac022c | 568 | int nr_threads; |
0c740d0a | 569 | struct list_head thread_head; |
1da177e4 LT |
570 | |
571 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
572 | ||
573 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 574 | struct task_struct *curr_target; |
1da177e4 LT |
575 | |
576 | /* shared signal handling: */ | |
577 | struct sigpending shared_pending; | |
578 | ||
579 | /* thread group exit support */ | |
580 | int group_exit_code; | |
581 | /* overloaded: | |
582 | * - notify group_exit_task when ->count is equal to notify_count | |
583 | * - everyone except group_exit_task is stopped during signal delivery | |
584 | * of fatal signals, group_exit_task processes the signal. | |
585 | */ | |
1da177e4 | 586 | int notify_count; |
07dd20e0 | 587 | struct task_struct *group_exit_task; |
1da177e4 LT |
588 | |
589 | /* thread group stop support, overloads group_exit_code too */ | |
590 | int group_stop_count; | |
591 | unsigned int flags; /* see SIGNAL_* flags below */ | |
592 | ||
ebec18a6 LP |
593 | /* |
594 | * PR_SET_CHILD_SUBREAPER marks a process, like a service | |
595 | * manager, to re-parent orphan (double-forking) child processes | |
596 | * to this process instead of 'init'. The service manager is | |
597 | * able to receive SIGCHLD signals and is able to investigate | |
598 | * the process until it calls wait(). All children of this | |
599 | * process will inherit a flag if they should look for a | |
600 | * child_subreaper process at exit. | |
601 | */ | |
602 | unsigned int is_child_subreaper:1; | |
603 | unsigned int has_child_subreaper:1; | |
604 | ||
1da177e4 | 605 | /* POSIX.1b Interval Timers */ |
5ed67f05 PE |
606 | int posix_timer_id; |
607 | struct list_head posix_timers; | |
1da177e4 LT |
608 | |
609 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 610 | struct hrtimer real_timer; |
fea9d175 | 611 | struct pid *leader_pid; |
2ff678b8 | 612 | ktime_t it_real_incr; |
1da177e4 | 613 | |
42c4ab41 SG |
614 | /* |
615 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use | |
616 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these | |
617 | * values are defined to 0 and 1 respectively | |
618 | */ | |
619 | struct cpu_itimer it[2]; | |
1da177e4 | 620 | |
f06febc9 | 621 | /* |
4cd4c1b4 PZ |
622 | * Thread group totals for process CPU timers. |
623 | * See thread_group_cputimer(), et al, for details. | |
f06febc9 | 624 | */ |
4cd4c1b4 | 625 | struct thread_group_cputimer cputimer; |
f06febc9 FM |
626 | |
627 | /* Earliest-expiration cache. */ | |
628 | struct task_cputime cputime_expires; | |
629 | ||
630 | struct list_head cpu_timers[3]; | |
631 | ||
ab521dc0 | 632 | struct pid *tty_old_pgrp; |
1ec320af | 633 | |
1da177e4 LT |
634 | /* boolean value for session group leader */ |
635 | int leader; | |
636 | ||
637 | struct tty_struct *tty; /* NULL if no tty */ | |
638 | ||
5091faa4 MG |
639 | #ifdef CONFIG_SCHED_AUTOGROUP |
640 | struct autogroup *autogroup; | |
641 | #endif | |
1da177e4 LT |
642 | /* |
643 | * Cumulative resource counters for dead threads in the group, | |
644 | * and for reaped dead child processes forked by this group. | |
645 | * Live threads maintain their own counters and add to these | |
646 | * in __exit_signal, except for the group leader. | |
647 | */ | |
32bd671d | 648 | cputime_t utime, stime, cutime, cstime; |
9ac52315 LV |
649 | cputime_t gtime; |
650 | cputime_t cgtime; | |
9fbc42ea | 651 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
d37f761d | 652 | struct cputime prev_cputime; |
0cf55e1e | 653 | #endif |
1da177e4 LT |
654 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
655 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 656 | unsigned long inblock, oublock, cinblock, coublock; |
1f10206c | 657 | unsigned long maxrss, cmaxrss; |
940389b8 | 658 | struct task_io_accounting ioac; |
1da177e4 | 659 | |
32bd671d PZ |
660 | /* |
661 | * Cumulative ns of schedule CPU time fo dead threads in the | |
662 | * group, not including a zombie group leader, (This only differs | |
663 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
664 | * other than jiffies.) | |
665 | */ | |
666 | unsigned long long sum_sched_runtime; | |
667 | ||
1da177e4 LT |
668 | /* |
669 | * We don't bother to synchronize most readers of this at all, | |
670 | * because there is no reader checking a limit that actually needs | |
671 | * to get both rlim_cur and rlim_max atomically, and either one | |
672 | * alone is a single word that can safely be read normally. | |
673 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
674 | * protect this instead of the siglock, because they really | |
675 | * have no need to disable irqs. | |
676 | */ | |
677 | struct rlimit rlim[RLIM_NLIMITS]; | |
678 | ||
0e464814 KK |
679 | #ifdef CONFIG_BSD_PROCESS_ACCT |
680 | struct pacct_struct pacct; /* per-process accounting information */ | |
681 | #endif | |
ad4ecbcb | 682 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
683 | struct taskstats *stats; |
684 | #endif | |
522ed776 MT |
685 | #ifdef CONFIG_AUDIT |
686 | unsigned audit_tty; | |
46e959ea | 687 | unsigned audit_tty_log_passwd; |
522ed776 MT |
688 | struct tty_audit_buf *tty_audit_buf; |
689 | #endif | |
4714d1d3 BB |
690 | #ifdef CONFIG_CGROUPS |
691 | /* | |
77e4ef99 TH |
692 | * group_rwsem prevents new tasks from entering the threadgroup and |
693 | * member tasks from exiting,a more specifically, setting of | |
694 | * PF_EXITING. fork and exit paths are protected with this rwsem | |
695 | * using threadgroup_change_begin/end(). Users which require | |
696 | * threadgroup to remain stable should use threadgroup_[un]lock() | |
697 | * which also takes care of exec path. Currently, cgroup is the | |
698 | * only user. | |
4714d1d3 | 699 | */ |
257058ae | 700 | struct rw_semaphore group_rwsem; |
4714d1d3 | 701 | #endif |
28b83c51 | 702 | |
e1e12d2f | 703 | oom_flags_t oom_flags; |
a9c58b90 DR |
704 | short oom_score_adj; /* OOM kill score adjustment */ |
705 | short oom_score_adj_min; /* OOM kill score adjustment min value. | |
706 | * Only settable by CAP_SYS_RESOURCE. */ | |
9b1bf12d KM |
707 | |
708 | struct mutex cred_guard_mutex; /* guard against foreign influences on | |
709 | * credential calculations | |
710 | * (notably. ptrace) */ | |
1da177e4 LT |
711 | }; |
712 | ||
713 | /* | |
714 | * Bits in flags field of signal_struct. | |
715 | */ | |
716 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
ee77f075 ON |
717 | #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ |
718 | #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ | |
403bad72 | 719 | #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */ |
e4420551 ON |
720 | /* |
721 | * Pending notifications to parent. | |
722 | */ | |
723 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
724 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
725 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
1da177e4 | 726 | |
fae5fa44 ON |
727 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
728 | ||
ed5d2cac ON |
729 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
730 | static inline int signal_group_exit(const struct signal_struct *sig) | |
731 | { | |
732 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
733 | (sig->group_exit_task != NULL); | |
734 | } | |
735 | ||
1da177e4 LT |
736 | /* |
737 | * Some day this will be a full-fledged user tracking system.. | |
738 | */ | |
739 | struct user_struct { | |
740 | atomic_t __count; /* reference count */ | |
741 | atomic_t processes; /* How many processes does this user have? */ | |
1da177e4 | 742 | atomic_t sigpending; /* How many pending signals does this user have? */ |
2d9048e2 | 743 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
744 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
745 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
746 | #endif | |
4afeff85 EP |
747 | #ifdef CONFIG_FANOTIFY |
748 | atomic_t fanotify_listeners; | |
749 | #endif | |
7ef9964e | 750 | #ifdef CONFIG_EPOLL |
52bd19f7 | 751 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
7ef9964e | 752 | #endif |
970a8645 | 753 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
754 | /* protected by mq_lock */ |
755 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 756 | #endif |
1da177e4 LT |
757 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
758 | ||
759 | #ifdef CONFIG_KEYS | |
760 | struct key *uid_keyring; /* UID specific keyring */ | |
761 | struct key *session_keyring; /* UID's default session keyring */ | |
762 | #endif | |
763 | ||
764 | /* Hash table maintenance information */ | |
735de223 | 765 | struct hlist_node uidhash_node; |
7b44ab97 | 766 | kuid_t uid; |
24e377a8 | 767 | |
cdd6c482 | 768 | #ifdef CONFIG_PERF_EVENTS |
789f90fc PZ |
769 | atomic_long_t locked_vm; |
770 | #endif | |
1da177e4 LT |
771 | }; |
772 | ||
eb41d946 | 773 | extern int uids_sysfs_init(void); |
5cb350ba | 774 | |
7b44ab97 | 775 | extern struct user_struct *find_user(kuid_t); |
1da177e4 LT |
776 | |
777 | extern struct user_struct root_user; | |
778 | #define INIT_USER (&root_user) | |
779 | ||
b6dff3ec | 780 | |
1da177e4 LT |
781 | struct backing_dev_info; |
782 | struct reclaim_state; | |
783 | ||
52f17b6c | 784 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
785 | struct sched_info { |
786 | /* cumulative counters */ | |
2d72376b | 787 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 788 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
789 | |
790 | /* timestamps */ | |
172ba844 BS |
791 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
792 | last_queued; /* when we were last queued to run */ | |
1da177e4 | 793 | }; |
52f17b6c | 794 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 795 | |
ca74e92b SN |
796 | #ifdef CONFIG_TASK_DELAY_ACCT |
797 | struct task_delay_info { | |
798 | spinlock_t lock; | |
799 | unsigned int flags; /* Private per-task flags */ | |
800 | ||
801 | /* For each stat XXX, add following, aligned appropriately | |
802 | * | |
803 | * struct timespec XXX_start, XXX_end; | |
804 | * u64 XXX_delay; | |
805 | * u32 XXX_count; | |
806 | * | |
807 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
808 | * single lock above (split into XXX_lock if contention is an issue). | |
809 | */ | |
0ff92245 SN |
810 | |
811 | /* | |
812 | * XXX_count is incremented on every XXX operation, the delay | |
813 | * associated with the operation is added to XXX_delay. | |
814 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
815 | */ | |
816 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ | |
817 | u64 blkio_delay; /* wait for sync block io completion */ | |
818 | u64 swapin_delay; /* wait for swapin block io completion */ | |
819 | u32 blkio_count; /* total count of the number of sync block */ | |
820 | /* io operations performed */ | |
821 | u32 swapin_count; /* total count of the number of swapin block */ | |
822 | /* io operations performed */ | |
873b4771 KK |
823 | |
824 | struct timespec freepages_start, freepages_end; | |
825 | u64 freepages_delay; /* wait for memory reclaim */ | |
826 | u32 freepages_count; /* total count of memory reclaim */ | |
ca74e92b | 827 | }; |
52f17b6c CS |
828 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
829 | ||
830 | static inline int sched_info_on(void) | |
831 | { | |
832 | #ifdef CONFIG_SCHEDSTATS | |
833 | return 1; | |
834 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
835 | extern int delayacct_on; | |
836 | return delayacct_on; | |
837 | #else | |
838 | return 0; | |
ca74e92b | 839 | #endif |
52f17b6c | 840 | } |
ca74e92b | 841 | |
d15bcfdb IM |
842 | enum cpu_idle_type { |
843 | CPU_IDLE, | |
844 | CPU_NOT_IDLE, | |
845 | CPU_NEWLY_IDLE, | |
846 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
847 | }; |
848 | ||
1399fa78 | 849 | /* |
ca8ce3d0 | 850 | * Increase resolution of cpu_capacity calculations |
1399fa78 | 851 | */ |
ca8ce3d0 NP |
852 | #define SCHED_CAPACITY_SHIFT 10 |
853 | #define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT) | |
1da177e4 | 854 | |
1399fa78 NR |
855 | /* |
856 | * sched-domains (multiprocessor balancing) declarations: | |
857 | */ | |
2dd73a4f | 858 | #ifdef CONFIG_SMP |
b5d978e0 PZ |
859 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
860 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ | |
861 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ | |
862 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ | |
c88d5910 | 863 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
b5d978e0 | 864 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
5d4dfddd | 865 | #define SD_SHARE_CPUCAPACITY 0x0080 /* Domain members share cpu power */ |
d77b3ed5 | 866 | #define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */ |
b5d978e0 PZ |
867 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ |
868 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ | |
532cb4c4 | 869 | #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ |
b5d978e0 | 870 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
e3589f6c | 871 | #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ |
3a7053b3 | 872 | #define SD_NUMA 0x4000 /* cross-node balancing */ |
5c45bf27 | 873 | |
143e1e28 | 874 | #ifdef CONFIG_SCHED_SMT |
b6220ad6 | 875 | static inline int cpu_smt_flags(void) |
143e1e28 | 876 | { |
5d4dfddd | 877 | return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES; |
143e1e28 VG |
878 | } |
879 | #endif | |
880 | ||
881 | #ifdef CONFIG_SCHED_MC | |
b6220ad6 | 882 | static inline int cpu_core_flags(void) |
143e1e28 VG |
883 | { |
884 | return SD_SHARE_PKG_RESOURCES; | |
885 | } | |
886 | #endif | |
887 | ||
888 | #ifdef CONFIG_NUMA | |
b6220ad6 | 889 | static inline int cpu_numa_flags(void) |
143e1e28 VG |
890 | { |
891 | return SD_NUMA; | |
892 | } | |
893 | #endif | |
532cb4c4 | 894 | |
1d3504fc HS |
895 | struct sched_domain_attr { |
896 | int relax_domain_level; | |
897 | }; | |
898 | ||
899 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ | |
900 | .relax_domain_level = -1, \ | |
901 | } | |
902 | ||
60495e77 PZ |
903 | extern int sched_domain_level_max; |
904 | ||
5e6521ea LZ |
905 | struct sched_group; |
906 | ||
1da177e4 LT |
907 | struct sched_domain { |
908 | /* These fields must be setup */ | |
909 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 910 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 | 911 | struct sched_group *groups; /* the balancing groups of the domain */ |
1da177e4 LT |
912 | unsigned long min_interval; /* Minimum balance interval ms */ |
913 | unsigned long max_interval; /* Maximum balance interval ms */ | |
914 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
915 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 916 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
917 | unsigned int busy_idx; |
918 | unsigned int idle_idx; | |
919 | unsigned int newidle_idx; | |
920 | unsigned int wake_idx; | |
147cbb4b | 921 | unsigned int forkexec_idx; |
a52bfd73 | 922 | unsigned int smt_gain; |
25f55d9d VG |
923 | |
924 | int nohz_idle; /* NOHZ IDLE status */ | |
1da177e4 | 925 | int flags; /* See SD_* */ |
60495e77 | 926 | int level; |
1da177e4 LT |
927 | |
928 | /* Runtime fields. */ | |
929 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
930 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
931 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
932 | ||
f48627e6 | 933 | /* idle_balance() stats */ |
9bd721c5 | 934 | u64 max_newidle_lb_cost; |
f48627e6 | 935 | unsigned long next_decay_max_lb_cost; |
2398f2c6 | 936 | |
1da177e4 LT |
937 | #ifdef CONFIG_SCHEDSTATS |
938 | /* load_balance() stats */ | |
480b9434 KC |
939 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
940 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; | |
941 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; | |
942 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; | |
943 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; | |
944 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; | |
945 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; | |
946 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; | |
1da177e4 LT |
947 | |
948 | /* Active load balancing */ | |
480b9434 KC |
949 | unsigned int alb_count; |
950 | unsigned int alb_failed; | |
951 | unsigned int alb_pushed; | |
1da177e4 | 952 | |
68767a0a | 953 | /* SD_BALANCE_EXEC stats */ |
480b9434 KC |
954 | unsigned int sbe_count; |
955 | unsigned int sbe_balanced; | |
956 | unsigned int sbe_pushed; | |
1da177e4 | 957 | |
68767a0a | 958 | /* SD_BALANCE_FORK stats */ |
480b9434 KC |
959 | unsigned int sbf_count; |
960 | unsigned int sbf_balanced; | |
961 | unsigned int sbf_pushed; | |
68767a0a | 962 | |
1da177e4 | 963 | /* try_to_wake_up() stats */ |
480b9434 KC |
964 | unsigned int ttwu_wake_remote; |
965 | unsigned int ttwu_move_affine; | |
966 | unsigned int ttwu_move_balance; | |
1da177e4 | 967 | #endif |
a5d8c348 IM |
968 | #ifdef CONFIG_SCHED_DEBUG |
969 | char *name; | |
970 | #endif | |
dce840a0 PZ |
971 | union { |
972 | void *private; /* used during construction */ | |
973 | struct rcu_head rcu; /* used during destruction */ | |
974 | }; | |
6c99e9ad | 975 | |
669c55e9 | 976 | unsigned int span_weight; |
4200efd9 IM |
977 | /* |
978 | * Span of all CPUs in this domain. | |
979 | * | |
980 | * NOTE: this field is variable length. (Allocated dynamically | |
981 | * by attaching extra space to the end of the structure, | |
982 | * depending on how many CPUs the kernel has booted up with) | |
4200efd9 IM |
983 | */ |
984 | unsigned long span[0]; | |
1da177e4 LT |
985 | }; |
986 | ||
758b2cdc RR |
987 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
988 | { | |
6c99e9ad | 989 | return to_cpumask(sd->span); |
758b2cdc RR |
990 | } |
991 | ||
acc3f5d7 | 992 | extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1d3504fc | 993 | struct sched_domain_attr *dattr_new); |
029190c5 | 994 | |
acc3f5d7 RR |
995 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
996 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); | |
997 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); | |
998 | ||
39be3501 PZ |
999 | bool cpus_share_cache(int this_cpu, int that_cpu); |
1000 | ||
143e1e28 | 1001 | typedef const struct cpumask *(*sched_domain_mask_f)(int cpu); |
b6220ad6 | 1002 | typedef int (*sched_domain_flags_f)(void); |
143e1e28 VG |
1003 | |
1004 | #define SDTL_OVERLAP 0x01 | |
1005 | ||
1006 | struct sd_data { | |
1007 | struct sched_domain **__percpu sd; | |
1008 | struct sched_group **__percpu sg; | |
63b2ca30 | 1009 | struct sched_group_capacity **__percpu sgc; |
143e1e28 VG |
1010 | }; |
1011 | ||
1012 | struct sched_domain_topology_level { | |
1013 | sched_domain_mask_f mask; | |
1014 | sched_domain_flags_f sd_flags; | |
1015 | int flags; | |
1016 | int numa_level; | |
1017 | struct sd_data data; | |
1018 | #ifdef CONFIG_SCHED_DEBUG | |
1019 | char *name; | |
1020 | #endif | |
1021 | }; | |
1022 | ||
1023 | extern struct sched_domain_topology_level *sched_domain_topology; | |
1024 | ||
1025 | extern void set_sched_topology(struct sched_domain_topology_level *tl); | |
1026 | ||
1027 | #ifdef CONFIG_SCHED_DEBUG | |
1028 | # define SD_INIT_NAME(type) .name = #type | |
1029 | #else | |
1030 | # define SD_INIT_NAME(type) | |
1031 | #endif | |
1032 | ||
1b427c15 | 1033 | #else /* CONFIG_SMP */ |
1da177e4 | 1034 | |
1b427c15 | 1035 | struct sched_domain_attr; |
d02c7a8c | 1036 | |
1b427c15 | 1037 | static inline void |
acc3f5d7 | 1038 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1b427c15 IM |
1039 | struct sched_domain_attr *dattr_new) |
1040 | { | |
d02c7a8c | 1041 | } |
39be3501 PZ |
1042 | |
1043 | static inline bool cpus_share_cache(int this_cpu, int that_cpu) | |
1044 | { | |
1045 | return true; | |
1046 | } | |
1047 | ||
1b427c15 | 1048 | #endif /* !CONFIG_SMP */ |
1da177e4 | 1049 | |
47fe38fc | 1050 | |
1da177e4 | 1051 | struct io_context; /* See blkdev.h */ |
1da177e4 | 1052 | |
1da177e4 | 1053 | |
383f2835 | 1054 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 1055 | extern void prefetch_stack(struct task_struct *t); |
383f2835 CK |
1056 | #else |
1057 | static inline void prefetch_stack(struct task_struct *t) { } | |
1058 | #endif | |
1da177e4 LT |
1059 | |
1060 | struct audit_context; /* See audit.c */ | |
1061 | struct mempolicy; | |
b92ce558 | 1062 | struct pipe_inode_info; |
4865ecf1 | 1063 | struct uts_namespace; |
1da177e4 | 1064 | |
20b8a59f | 1065 | struct load_weight { |
9dbdb155 PZ |
1066 | unsigned long weight; |
1067 | u32 inv_weight; | |
20b8a59f IM |
1068 | }; |
1069 | ||
9d85f21c PT |
1070 | struct sched_avg { |
1071 | /* | |
1072 | * These sums represent an infinite geometric series and so are bound | |
239003ea | 1073 | * above by 1024/(1-y). Thus we only need a u32 to store them for all |
9d85f21c PT |
1074 | * choices of y < 1-2^(-32)*1024. |
1075 | */ | |
1076 | u32 runnable_avg_sum, runnable_avg_period; | |
1077 | u64 last_runnable_update; | |
9ee474f5 | 1078 | s64 decay_count; |
2dac754e | 1079 | unsigned long load_avg_contrib; |
9d85f21c PT |
1080 | }; |
1081 | ||
94c18227 | 1082 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 1083 | struct sched_statistics { |
20b8a59f | 1084 | u64 wait_start; |
94c18227 | 1085 | u64 wait_max; |
6d082592 AV |
1086 | u64 wait_count; |
1087 | u64 wait_sum; | |
8f0dfc34 AV |
1088 | u64 iowait_count; |
1089 | u64 iowait_sum; | |
94c18227 | 1090 | |
20b8a59f | 1091 | u64 sleep_start; |
20b8a59f | 1092 | u64 sleep_max; |
94c18227 IM |
1093 | s64 sum_sleep_runtime; |
1094 | ||
1095 | u64 block_start; | |
20b8a59f IM |
1096 | u64 block_max; |
1097 | u64 exec_max; | |
eba1ed4b | 1098 | u64 slice_max; |
cc367732 | 1099 | |
cc367732 IM |
1100 | u64 nr_migrations_cold; |
1101 | u64 nr_failed_migrations_affine; | |
1102 | u64 nr_failed_migrations_running; | |
1103 | u64 nr_failed_migrations_hot; | |
1104 | u64 nr_forced_migrations; | |
cc367732 IM |
1105 | |
1106 | u64 nr_wakeups; | |
1107 | u64 nr_wakeups_sync; | |
1108 | u64 nr_wakeups_migrate; | |
1109 | u64 nr_wakeups_local; | |
1110 | u64 nr_wakeups_remote; | |
1111 | u64 nr_wakeups_affine; | |
1112 | u64 nr_wakeups_affine_attempts; | |
1113 | u64 nr_wakeups_passive; | |
1114 | u64 nr_wakeups_idle; | |
41acab88 LDM |
1115 | }; |
1116 | #endif | |
1117 | ||
1118 | struct sched_entity { | |
1119 | struct load_weight load; /* for load-balancing */ | |
1120 | struct rb_node run_node; | |
1121 | struct list_head group_node; | |
1122 | unsigned int on_rq; | |
1123 | ||
1124 | u64 exec_start; | |
1125 | u64 sum_exec_runtime; | |
1126 | u64 vruntime; | |
1127 | u64 prev_sum_exec_runtime; | |
1128 | ||
41acab88 LDM |
1129 | u64 nr_migrations; |
1130 | ||
41acab88 LDM |
1131 | #ifdef CONFIG_SCHEDSTATS |
1132 | struct sched_statistics statistics; | |
94c18227 IM |
1133 | #endif |
1134 | ||
20b8a59f | 1135 | #ifdef CONFIG_FAIR_GROUP_SCHED |
fed14d45 | 1136 | int depth; |
20b8a59f IM |
1137 | struct sched_entity *parent; |
1138 | /* rq on which this entity is (to be) queued: */ | |
1139 | struct cfs_rq *cfs_rq; | |
1140 | /* rq "owned" by this entity/group: */ | |
1141 | struct cfs_rq *my_q; | |
1142 | #endif | |
8bd75c77 | 1143 | |
141965c7 | 1144 | #ifdef CONFIG_SMP |
f4e26b12 | 1145 | /* Per-entity load-tracking */ |
9d85f21c PT |
1146 | struct sched_avg avg; |
1147 | #endif | |
20b8a59f | 1148 | }; |
70b97a7f | 1149 | |
fa717060 PZ |
1150 | struct sched_rt_entity { |
1151 | struct list_head run_list; | |
78f2c7db | 1152 | unsigned long timeout; |
57d2aa00 | 1153 | unsigned long watchdog_stamp; |
bee367ed | 1154 | unsigned int time_slice; |
6f505b16 | 1155 | |
58d6c2d7 | 1156 | struct sched_rt_entity *back; |
052f1dc7 | 1157 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
1158 | struct sched_rt_entity *parent; |
1159 | /* rq on which this entity is (to be) queued: */ | |
1160 | struct rt_rq *rt_rq; | |
1161 | /* rq "owned" by this entity/group: */ | |
1162 | struct rt_rq *my_q; | |
1163 | #endif | |
fa717060 PZ |
1164 | }; |
1165 | ||
aab03e05 DF |
1166 | struct sched_dl_entity { |
1167 | struct rb_node rb_node; | |
1168 | ||
1169 | /* | |
1170 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 1171 | * during sched_setattr(), they will remain the same until |
1172 | * the next sched_setattr(). | |
aab03e05 DF |
1173 | */ |
1174 | u64 dl_runtime; /* maximum runtime for each instance */ | |
1175 | u64 dl_deadline; /* relative deadline of each instance */ | |
755378a4 | 1176 | u64 dl_period; /* separation of two instances (period) */ |
332ac17e | 1177 | u64 dl_bw; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
1178 | |
1179 | /* | |
1180 | * Actual scheduling parameters. Initialized with the values above, | |
1181 | * they are continously updated during task execution. Note that | |
1182 | * the remaining runtime could be < 0 in case we are in overrun. | |
1183 | */ | |
1184 | s64 runtime; /* remaining runtime for this instance */ | |
1185 | u64 deadline; /* absolute deadline for this instance */ | |
1186 | unsigned int flags; /* specifying the scheduler behaviour */ | |
1187 | ||
1188 | /* | |
1189 | * Some bool flags: | |
1190 | * | |
1191 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
1192 | * task has to wait for a replenishment to be performed at the | |
1193 | * next firing of dl_timer. | |
1194 | * | |
1195 | * @dl_new tells if a new instance arrived. If so we must | |
1196 | * start executing it with full runtime and reset its absolute | |
1197 | * deadline; | |
2d3d891d DF |
1198 | * |
1199 | * @dl_boosted tells if we are boosted due to DI. If so we are | |
1200 | * outside bandwidth enforcement mechanism (but only until we | |
5bfd126e JL |
1201 | * exit the critical section); |
1202 | * | |
1203 | * @dl_yielded tells if task gave up the cpu before consuming | |
1204 | * all its available runtime during the last job. | |
aab03e05 | 1205 | */ |
5bfd126e | 1206 | int dl_throttled, dl_new, dl_boosted, dl_yielded; |
aab03e05 DF |
1207 | |
1208 | /* | |
1209 | * Bandwidth enforcement timer. Each -deadline task has its | |
1210 | * own bandwidth to be enforced, thus we need one timer per task. | |
1211 | */ | |
1212 | struct hrtimer dl_timer; | |
1213 | }; | |
8bd75c77 | 1214 | |
86848966 PM |
1215 | struct rcu_node; |
1216 | ||
8dc85d54 PZ |
1217 | enum perf_event_task_context { |
1218 | perf_invalid_context = -1, | |
1219 | perf_hw_context = 0, | |
89a1e187 | 1220 | perf_sw_context, |
8dc85d54 PZ |
1221 | perf_nr_task_contexts, |
1222 | }; | |
1223 | ||
1da177e4 LT |
1224 | struct task_struct { |
1225 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 1226 | void *stack; |
1da177e4 | 1227 | atomic_t usage; |
97dc32cd WC |
1228 | unsigned int flags; /* per process flags, defined below */ |
1229 | unsigned int ptrace; | |
1da177e4 | 1230 | |
2dd73a4f | 1231 | #ifdef CONFIG_SMP |
fa14ff4a | 1232 | struct llist_node wake_entry; |
3ca7a440 | 1233 | int on_cpu; |
62470419 MW |
1234 | struct task_struct *last_wakee; |
1235 | unsigned long wakee_flips; | |
1236 | unsigned long wakee_flip_decay_ts; | |
ac66f547 PZ |
1237 | |
1238 | int wake_cpu; | |
2dd73a4f | 1239 | #endif |
fd2f4419 | 1240 | int on_rq; |
50e645a8 | 1241 | |
b29739f9 | 1242 | int prio, static_prio, normal_prio; |
c7aceaba | 1243 | unsigned int rt_priority; |
5522d5d5 | 1244 | const struct sched_class *sched_class; |
20b8a59f | 1245 | struct sched_entity se; |
fa717060 | 1246 | struct sched_rt_entity rt; |
8323f26c PZ |
1247 | #ifdef CONFIG_CGROUP_SCHED |
1248 | struct task_group *sched_task_group; | |
1249 | #endif | |
aab03e05 | 1250 | struct sched_dl_entity dl; |
1da177e4 | 1251 | |
e107be36 AK |
1252 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1253 | /* list of struct preempt_notifier: */ | |
1254 | struct hlist_head preempt_notifiers; | |
1255 | #endif | |
1256 | ||
6c5c9341 | 1257 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 1258 | unsigned int btrace_seq; |
6c5c9341 | 1259 | #endif |
1da177e4 | 1260 | |
97dc32cd | 1261 | unsigned int policy; |
29baa747 | 1262 | int nr_cpus_allowed; |
1da177e4 | 1263 | cpumask_t cpus_allowed; |
1da177e4 | 1264 | |
a57eb940 | 1265 | #ifdef CONFIG_PREEMPT_RCU |
e260be67 | 1266 | int rcu_read_lock_nesting; |
f41d911f | 1267 | char rcu_read_unlock_special; |
f41d911f | 1268 | struct list_head rcu_node_entry; |
a57eb940 PM |
1269 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
1270 | #ifdef CONFIG_TREE_PREEMPT_RCU | |
1271 | struct rcu_node *rcu_blocked_node; | |
f41d911f | 1272 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
24278d14 PM |
1273 | #ifdef CONFIG_RCU_BOOST |
1274 | struct rt_mutex *rcu_boost_mutex; | |
1275 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
e260be67 | 1276 | |
52f17b6c | 1277 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
1278 | struct sched_info sched_info; |
1279 | #endif | |
1280 | ||
1281 | struct list_head tasks; | |
806c09a7 | 1282 | #ifdef CONFIG_SMP |
917b627d | 1283 | struct plist_node pushable_tasks; |
1baca4ce | 1284 | struct rb_node pushable_dl_tasks; |
806c09a7 | 1285 | #endif |
1da177e4 LT |
1286 | |
1287 | struct mm_struct *mm, *active_mm; | |
4471a675 JK |
1288 | #ifdef CONFIG_COMPAT_BRK |
1289 | unsigned brk_randomized:1; | |
1290 | #endif | |
615d6e87 DB |
1291 | /* per-thread vma caching */ |
1292 | u32 vmacache_seqnum; | |
1293 | struct vm_area_struct *vmacache[VMACACHE_SIZE]; | |
34e55232 KH |
1294 | #if defined(SPLIT_RSS_COUNTING) |
1295 | struct task_rss_stat rss_stat; | |
1296 | #endif | |
1da177e4 | 1297 | /* task state */ |
97dc32cd | 1298 | int exit_state; |
1da177e4 LT |
1299 | int exit_code, exit_signal; |
1300 | int pdeath_signal; /* The signal sent when the parent dies */ | |
a8f072c1 | 1301 | unsigned int jobctl; /* JOBCTL_*, siglock protected */ |
9b89f6ba AE |
1302 | |
1303 | /* Used for emulating ABI behavior of previous Linux versions */ | |
97dc32cd | 1304 | unsigned int personality; |
9b89f6ba | 1305 | |
f9ce1f1c KT |
1306 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
1307 | * execve */ | |
8f0dfc34 AV |
1308 | unsigned in_iowait:1; |
1309 | ||
259e5e6c AL |
1310 | /* task may not gain privileges */ |
1311 | unsigned no_new_privs:1; | |
ca94c442 LP |
1312 | |
1313 | /* Revert to default priority/policy when forking */ | |
1314 | unsigned sched_reset_on_fork:1; | |
a8e4f2ea | 1315 | unsigned sched_contributes_to_load:1; |
ca94c442 | 1316 | |
1da177e4 LT |
1317 | pid_t pid; |
1318 | pid_t tgid; | |
0a425405 | 1319 | |
1314562a | 1320 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
1321 | /* Canary value for the -fstack-protector gcc feature */ |
1322 | unsigned long stack_canary; | |
1314562a | 1323 | #endif |
4d1d61a6 | 1324 | /* |
1da177e4 | 1325 | * pointers to (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 1326 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 1327 | * p->real_parent->pid) |
1da177e4 | 1328 | */ |
abd63bc3 KC |
1329 | struct task_struct __rcu *real_parent; /* real parent process */ |
1330 | struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 1331 | /* |
f470021a | 1332 | * children/sibling forms the list of my natural children |
1da177e4 LT |
1333 | */ |
1334 | struct list_head children; /* list of my children */ | |
1335 | struct list_head sibling; /* linkage in my parent's children list */ | |
1336 | struct task_struct *group_leader; /* threadgroup leader */ | |
1337 | ||
f470021a RM |
1338 | /* |
1339 | * ptraced is the list of tasks this task is using ptrace on. | |
1340 | * This includes both natural children and PTRACE_ATTACH targets. | |
1341 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
1342 | */ | |
1343 | struct list_head ptraced; | |
1344 | struct list_head ptrace_entry; | |
1345 | ||
1da177e4 | 1346 | /* PID/PID hash table linkage. */ |
92476d7f | 1347 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1348 | struct list_head thread_group; |
0c740d0a | 1349 | struct list_head thread_node; |
1da177e4 LT |
1350 | |
1351 | struct completion *vfork_done; /* for vfork() */ | |
1352 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1353 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1354 | ||
c66f08be | 1355 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1356 | cputime_t gtime; |
9fbc42ea | 1357 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
d37f761d | 1358 | struct cputime prev_cputime; |
6a61671b FW |
1359 | #endif |
1360 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN | |
1361 | seqlock_t vtime_seqlock; | |
1362 | unsigned long long vtime_snap; | |
1363 | enum { | |
1364 | VTIME_SLEEPING = 0, | |
1365 | VTIME_USER, | |
1366 | VTIME_SYS, | |
1367 | } vtime_snap_whence; | |
d99ca3b9 | 1368 | #endif |
1da177e4 | 1369 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
924b42d5 TJ |
1370 | struct timespec start_time; /* monotonic time */ |
1371 | struct timespec real_start_time; /* boot based time */ | |
1da177e4 LT |
1372 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1373 | unsigned long min_flt, maj_flt; | |
1374 | ||
f06febc9 | 1375 | struct task_cputime cputime_expires; |
1da177e4 LT |
1376 | struct list_head cpu_timers[3]; |
1377 | ||
1378 | /* process credentials */ | |
1b0ba1c9 | 1379 | const struct cred __rcu *real_cred; /* objective and real subjective task |
3b11a1de | 1380 | * credentials (COW) */ |
1b0ba1c9 | 1381 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
3b11a1de | 1382 | * credentials (COW) */ |
36772092 PBG |
1383 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1384 | - access with [gs]et_task_comm (which lock | |
1385 | it with task_lock()) | |
221af7f8 | 1386 | - initialized normally by setup_new_exec */ |
1da177e4 LT |
1387 | /* file system info */ |
1388 | int link_count, total_link_count; | |
3d5b6fcc | 1389 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1390 | /* ipc stuff */ |
1391 | struct sysv_sem sysvsem; | |
3d5b6fcc | 1392 | #endif |
e162b39a | 1393 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 1394 | /* hung task detection */ |
82a1fcb9 IM |
1395 | unsigned long last_switch_count; |
1396 | #endif | |
1da177e4 LT |
1397 | /* CPU-specific state of this task */ |
1398 | struct thread_struct thread; | |
1399 | /* filesystem information */ | |
1400 | struct fs_struct *fs; | |
1401 | /* open file information */ | |
1402 | struct files_struct *files; | |
1651e14e | 1403 | /* namespaces */ |
ab516013 | 1404 | struct nsproxy *nsproxy; |
1da177e4 LT |
1405 | /* signal handlers */ |
1406 | struct signal_struct *signal; | |
1407 | struct sighand_struct *sighand; | |
1408 | ||
1409 | sigset_t blocked, real_blocked; | |
f3de272b | 1410 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
1411 | struct sigpending pending; |
1412 | ||
1413 | unsigned long sas_ss_sp; | |
1414 | size_t sas_ss_size; | |
1415 | int (*notifier)(void *priv); | |
1416 | void *notifier_data; | |
1417 | sigset_t *notifier_mask; | |
67d12145 | 1418 | struct callback_head *task_works; |
e73f8959 | 1419 | |
1da177e4 | 1420 | struct audit_context *audit_context; |
bfef93a5 | 1421 | #ifdef CONFIG_AUDITSYSCALL |
e1760bd5 | 1422 | kuid_t loginuid; |
4746ec5b | 1423 | unsigned int sessionid; |
bfef93a5 | 1424 | #endif |
932ecebb | 1425 | struct seccomp seccomp; |
1da177e4 LT |
1426 | |
1427 | /* Thread group tracking */ | |
1428 | u32 parent_exec_id; | |
1429 | u32 self_exec_id; | |
58568d2a MX |
1430 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1431 | * mempolicy */ | |
1da177e4 | 1432 | spinlock_t alloc_lock; |
1da177e4 | 1433 | |
b29739f9 | 1434 | /* Protection of the PI data structures: */ |
1d615482 | 1435 | raw_spinlock_t pi_lock; |
b29739f9 | 1436 | |
23f78d4a IM |
1437 | #ifdef CONFIG_RT_MUTEXES |
1438 | /* PI waiters blocked on a rt_mutex held by this task */ | |
fb00aca4 PZ |
1439 | struct rb_root pi_waiters; |
1440 | struct rb_node *pi_waiters_leftmost; | |
23f78d4a IM |
1441 | /* Deadlock detection and priority inheritance handling */ |
1442 | struct rt_mutex_waiter *pi_blocked_on; | |
2d3d891d DF |
1443 | /* Top pi_waiters task */ |
1444 | struct task_struct *pi_top_task; | |
23f78d4a IM |
1445 | #endif |
1446 | ||
408894ee IM |
1447 | #ifdef CONFIG_DEBUG_MUTEXES |
1448 | /* mutex deadlock detection */ | |
1449 | struct mutex_waiter *blocked_on; | |
1450 | #endif | |
de30a2b3 IM |
1451 | #ifdef CONFIG_TRACE_IRQFLAGS |
1452 | unsigned int irq_events; | |
de30a2b3 | 1453 | unsigned long hardirq_enable_ip; |
de30a2b3 | 1454 | unsigned long hardirq_disable_ip; |
fa1452e8 | 1455 | unsigned int hardirq_enable_event; |
de30a2b3 | 1456 | unsigned int hardirq_disable_event; |
fa1452e8 HS |
1457 | int hardirqs_enabled; |
1458 | int hardirq_context; | |
de30a2b3 | 1459 | unsigned long softirq_disable_ip; |
de30a2b3 | 1460 | unsigned long softirq_enable_ip; |
fa1452e8 | 1461 | unsigned int softirq_disable_event; |
de30a2b3 | 1462 | unsigned int softirq_enable_event; |
fa1452e8 | 1463 | int softirqs_enabled; |
de30a2b3 IM |
1464 | int softirq_context; |
1465 | #endif | |
fbb9ce95 | 1466 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 1467 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
1468 | u64 curr_chain_key; |
1469 | int lockdep_depth; | |
fbb9ce95 | 1470 | unsigned int lockdep_recursion; |
c7aceaba | 1471 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 1472 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 1473 | #endif |
408894ee | 1474 | |
1da177e4 LT |
1475 | /* journalling filesystem info */ |
1476 | void *journal_info; | |
1477 | ||
d89d8796 | 1478 | /* stacked block device info */ |
bddd87c7 | 1479 | struct bio_list *bio_list; |
d89d8796 | 1480 | |
73c10101 JA |
1481 | #ifdef CONFIG_BLOCK |
1482 | /* stack plugging */ | |
1483 | struct blk_plug *plug; | |
1484 | #endif | |
1485 | ||
1da177e4 LT |
1486 | /* VM state */ |
1487 | struct reclaim_state *reclaim_state; | |
1488 | ||
1da177e4 LT |
1489 | struct backing_dev_info *backing_dev_info; |
1490 | ||
1491 | struct io_context *io_context; | |
1492 | ||
1493 | unsigned long ptrace_message; | |
1494 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 1495 | struct task_io_accounting ioac; |
8f0ab514 | 1496 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1497 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1498 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
49b5cf34 | 1499 | cputime_t acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
1500 | #endif |
1501 | #ifdef CONFIG_CPUSETS | |
58568d2a | 1502 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
cc9a6c87 | 1503 | seqcount_t mems_allowed_seq; /* Seqence no to catch updates */ |
825a46af | 1504 | int cpuset_mem_spread_rotor; |
6adef3eb | 1505 | int cpuset_slab_spread_rotor; |
1da177e4 | 1506 | #endif |
ddbcc7e8 | 1507 | #ifdef CONFIG_CGROUPS |
817929ec | 1508 | /* Control Group info protected by css_set_lock */ |
2c392b8c | 1509 | struct css_set __rcu *cgroups; |
817929ec PM |
1510 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
1511 | struct list_head cg_list; | |
ddbcc7e8 | 1512 | #endif |
42b2dd0a | 1513 | #ifdef CONFIG_FUTEX |
0771dfef | 1514 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1515 | #ifdef CONFIG_COMPAT |
1516 | struct compat_robust_list_head __user *compat_robust_list; | |
1517 | #endif | |
c87e2837 IM |
1518 | struct list_head pi_state_list; |
1519 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1520 | #endif |
cdd6c482 | 1521 | #ifdef CONFIG_PERF_EVENTS |
8dc85d54 | 1522 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
cdd6c482 IM |
1523 | struct mutex perf_event_mutex; |
1524 | struct list_head perf_event_list; | |
a63eaf34 | 1525 | #endif |
8f47b187 TG |
1526 | #ifdef CONFIG_DEBUG_PREEMPT |
1527 | unsigned long preempt_disable_ip; | |
1528 | #endif | |
c7aceaba | 1529 | #ifdef CONFIG_NUMA |
58568d2a | 1530 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 1531 | short il_next; |
207205a2 | 1532 | short pref_node_fork; |
42b2dd0a | 1533 | #endif |
cbee9f88 PZ |
1534 | #ifdef CONFIG_NUMA_BALANCING |
1535 | int numa_scan_seq; | |
cbee9f88 | 1536 | unsigned int numa_scan_period; |
598f0ec0 | 1537 | unsigned int numa_scan_period_max; |
de1c9ce6 | 1538 | int numa_preferred_nid; |
6b9a7460 | 1539 | unsigned long numa_migrate_retry; |
cbee9f88 | 1540 | u64 node_stamp; /* migration stamp */ |
7e2703e6 RR |
1541 | u64 last_task_numa_placement; |
1542 | u64 last_sum_exec_runtime; | |
cbee9f88 | 1543 | struct callback_head numa_work; |
f809ca9a | 1544 | |
8c8a743c PZ |
1545 | struct list_head numa_entry; |
1546 | struct numa_group *numa_group; | |
1547 | ||
745d6147 MG |
1548 | /* |
1549 | * Exponential decaying average of faults on a per-node basis. | |
1550 | * Scheduling placement decisions are made based on the these counts. | |
1551 | * The values remain static for the duration of a PTE scan | |
1552 | */ | |
ff1df896 | 1553 | unsigned long *numa_faults_memory; |
83e1d2cd | 1554 | unsigned long total_numa_faults; |
745d6147 MG |
1555 | |
1556 | /* | |
1557 | * numa_faults_buffer records faults per node during the current | |
ff1df896 RR |
1558 | * scan window. When the scan completes, the counts in |
1559 | * numa_faults_memory decay and these values are copied. | |
745d6147 | 1560 | */ |
ff1df896 | 1561 | unsigned long *numa_faults_buffer_memory; |
745d6147 | 1562 | |
50ec8a40 RR |
1563 | /* |
1564 | * Track the nodes the process was running on when a NUMA hinting | |
1565 | * fault was incurred. | |
1566 | */ | |
1567 | unsigned long *numa_faults_cpu; | |
1568 | unsigned long *numa_faults_buffer_cpu; | |
1569 | ||
04bb2f94 RR |
1570 | /* |
1571 | * numa_faults_locality tracks if faults recorded during the last | |
1572 | * scan window were remote/local. The task scan period is adapted | |
1573 | * based on the locality of the faults with different weights | |
1574 | * depending on whether they were shared or private faults | |
1575 | */ | |
1576 | unsigned long numa_faults_locality[2]; | |
1577 | ||
b32e86b4 | 1578 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
1579 | #endif /* CONFIG_NUMA_BALANCING */ |
1580 | ||
e56d0903 | 1581 | struct rcu_head rcu; |
b92ce558 JA |
1582 | |
1583 | /* | |
1584 | * cache last used pipe for splice | |
1585 | */ | |
1586 | struct pipe_inode_info *splice_pipe; | |
5640f768 ED |
1587 | |
1588 | struct page_frag task_frag; | |
1589 | ||
ca74e92b SN |
1590 | #ifdef CONFIG_TASK_DELAY_ACCT |
1591 | struct task_delay_info *delays; | |
f4f154fd AM |
1592 | #endif |
1593 | #ifdef CONFIG_FAULT_INJECTION | |
1594 | int make_it_fail; | |
ca74e92b | 1595 | #endif |
9d823e8f WF |
1596 | /* |
1597 | * when (nr_dirtied >= nr_dirtied_pause), it's time to call | |
1598 | * balance_dirty_pages() for some dirty throttling pause | |
1599 | */ | |
1600 | int nr_dirtied; | |
1601 | int nr_dirtied_pause; | |
83712358 | 1602 | unsigned long dirty_paused_when; /* start of a write-and-pause period */ |
9d823e8f | 1603 | |
9745512c AV |
1604 | #ifdef CONFIG_LATENCYTOP |
1605 | int latency_record_count; | |
1606 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1607 | #endif | |
6976675d AV |
1608 | /* |
1609 | * time slack values; these are used to round up poll() and | |
1610 | * select() etc timeout values. These are in nanoseconds. | |
1611 | */ | |
1612 | unsigned long timer_slack_ns; | |
1613 | unsigned long default_timer_slack_ns; | |
f8d570a4 | 1614 | |
fb52607a | 1615 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
3ad2f3fb | 1616 | /* Index of current stored address in ret_stack */ |
f201ae23 FW |
1617 | int curr_ret_stack; |
1618 | /* Stack of return addresses for return function tracing */ | |
1619 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
1620 | /* time stamp for last schedule */ |
1621 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
1622 | /* |
1623 | * Number of functions that haven't been traced | |
1624 | * because of depth overrun. | |
1625 | */ | |
1626 | atomic_t trace_overrun; | |
380c4b14 FW |
1627 | /* Pause for the tracing */ |
1628 | atomic_t tracing_graph_pause; | |
f201ae23 | 1629 | #endif |
ea4e2bc4 SR |
1630 | #ifdef CONFIG_TRACING |
1631 | /* state flags for use by tracers */ | |
1632 | unsigned long trace; | |
b1cff0ad | 1633 | /* bitmask and counter of trace recursion */ |
261842b7 SR |
1634 | unsigned long trace_recursion; |
1635 | #endif /* CONFIG_TRACING */ | |
c255a458 | 1636 | #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */ |
569b846d KH |
1637 | struct memcg_batch_info { |
1638 | int do_batch; /* incremented when batch uncharge started */ | |
1639 | struct mem_cgroup *memcg; /* target memcg of uncharge */ | |
7ffd4ca7 JW |
1640 | unsigned long nr_pages; /* uncharged usage */ |
1641 | unsigned long memsw_nr_pages; /* uncharged mem+swap usage */ | |
569b846d | 1642 | } memcg_batch; |
0e9d92f2 | 1643 | unsigned int memcg_kmem_skip_account; |
519e5247 | 1644 | struct memcg_oom_info { |
49426420 JW |
1645 | struct mem_cgroup *memcg; |
1646 | gfp_t gfp_mask; | |
1647 | int order; | |
519e5247 JW |
1648 | unsigned int may_oom:1; |
1649 | } memcg_oom; | |
569b846d | 1650 | #endif |
0326f5a9 SD |
1651 | #ifdef CONFIG_UPROBES |
1652 | struct uprobe_task *utask; | |
0326f5a9 | 1653 | #endif |
cafe5635 KO |
1654 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
1655 | unsigned int sequential_io; | |
1656 | unsigned int sequential_io_avg; | |
1657 | #endif | |
1da177e4 LT |
1658 | }; |
1659 | ||
76e6eee0 | 1660 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
a4636818 | 1661 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
76e6eee0 | 1662 | |
6688cc05 PZ |
1663 | #define TNF_MIGRATED 0x01 |
1664 | #define TNF_NO_GROUP 0x02 | |
dabe1d99 | 1665 | #define TNF_SHARED 0x04 |
04bb2f94 | 1666 | #define TNF_FAULT_LOCAL 0x08 |
6688cc05 | 1667 | |
cbee9f88 | 1668 | #ifdef CONFIG_NUMA_BALANCING |
6688cc05 | 1669 | extern void task_numa_fault(int last_node, int node, int pages, int flags); |
e29cf08b | 1670 | extern pid_t task_numa_group_id(struct task_struct *p); |
1a687c2e | 1671 | extern void set_numabalancing_state(bool enabled); |
82727018 | 1672 | extern void task_numa_free(struct task_struct *p); |
10f39042 RR |
1673 | extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page, |
1674 | int src_nid, int dst_cpu); | |
cbee9f88 | 1675 | #else |
ac8e895b | 1676 | static inline void task_numa_fault(int last_node, int node, int pages, |
6688cc05 | 1677 | int flags) |
cbee9f88 PZ |
1678 | { |
1679 | } | |
e29cf08b MG |
1680 | static inline pid_t task_numa_group_id(struct task_struct *p) |
1681 | { | |
1682 | return 0; | |
1683 | } | |
1a687c2e MG |
1684 | static inline void set_numabalancing_state(bool enabled) |
1685 | { | |
1686 | } | |
82727018 RR |
1687 | static inline void task_numa_free(struct task_struct *p) |
1688 | { | |
1689 | } | |
10f39042 RR |
1690 | static inline bool should_numa_migrate_memory(struct task_struct *p, |
1691 | struct page *page, int src_nid, int dst_cpu) | |
1692 | { | |
1693 | return true; | |
1694 | } | |
cbee9f88 PZ |
1695 | #endif |
1696 | ||
e868171a | 1697 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1698 | { |
1699 | return task->pids[PIDTYPE_PID].pid; | |
1700 | } | |
1701 | ||
e868171a | 1702 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1703 | { |
1704 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1705 | } | |
1706 | ||
6dda81f4 ON |
1707 | /* |
1708 | * Without tasklist or rcu lock it is not safe to dereference | |
1709 | * the result of task_pgrp/task_session even if task == current, | |
1710 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1711 | */ | |
e868171a | 1712 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1713 | { |
1714 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1715 | } | |
1716 | ||
e868171a | 1717 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1718 | { |
1719 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1720 | } | |
1721 | ||
7af57294 PE |
1722 | struct pid_namespace; |
1723 | ||
1724 | /* | |
1725 | * the helpers to get the task's different pids as they are seen | |
1726 | * from various namespaces | |
1727 | * | |
1728 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1729 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1730 | * current. | |
7af57294 PE |
1731 | * task_xid_nr_ns() : id seen from the ns specified; |
1732 | * | |
1733 | * set_task_vxid() : assigns a virtual id to a task; | |
1734 | * | |
7af57294 PE |
1735 | * see also pid_nr() etc in include/linux/pid.h |
1736 | */ | |
52ee2dfd ON |
1737 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1738 | struct pid_namespace *ns); | |
7af57294 | 1739 | |
e868171a | 1740 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1741 | { |
1742 | return tsk->pid; | |
1743 | } | |
1744 | ||
52ee2dfd ON |
1745 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1746 | struct pid_namespace *ns) | |
1747 | { | |
1748 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1749 | } | |
7af57294 PE |
1750 | |
1751 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1752 | { | |
52ee2dfd | 1753 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1754 | } |
1755 | ||
1756 | ||
e868171a | 1757 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1758 | { |
1759 | return tsk->tgid; | |
1760 | } | |
1761 | ||
2f2a3a46 | 1762 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1763 | |
1764 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1765 | { | |
1766 | return pid_vnr(task_tgid(tsk)); | |
1767 | } | |
1768 | ||
1769 | ||
80e0b6e8 | 1770 | static inline int pid_alive(const struct task_struct *p); |
ad36d282 RGB |
1771 | static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) |
1772 | { | |
1773 | pid_t pid = 0; | |
1774 | ||
1775 | rcu_read_lock(); | |
1776 | if (pid_alive(tsk)) | |
1777 | pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); | |
1778 | rcu_read_unlock(); | |
1779 | ||
1780 | return pid; | |
1781 | } | |
1782 | ||
1783 | static inline pid_t task_ppid_nr(const struct task_struct *tsk) | |
1784 | { | |
1785 | return task_ppid_nr_ns(tsk, &init_pid_ns); | |
1786 | } | |
1787 | ||
52ee2dfd ON |
1788 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1789 | struct pid_namespace *ns) | |
7af57294 | 1790 | { |
52ee2dfd | 1791 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1792 | } |
1793 | ||
7af57294 PE |
1794 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1795 | { | |
52ee2dfd | 1796 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1797 | } |
1798 | ||
1799 | ||
52ee2dfd ON |
1800 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1801 | struct pid_namespace *ns) | |
7af57294 | 1802 | { |
52ee2dfd | 1803 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1804 | } |
1805 | ||
7af57294 PE |
1806 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1807 | { | |
52ee2dfd | 1808 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1809 | } |
1810 | ||
1b0f7ffd ON |
1811 | /* obsolete, do not use */ |
1812 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1813 | { | |
1814 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1815 | } | |
7af57294 | 1816 | |
1da177e4 LT |
1817 | /** |
1818 | * pid_alive - check that a task structure is not stale | |
1819 | * @p: Task structure to be checked. | |
1820 | * | |
1821 | * Test if a process is not yet dead (at most zombie state) | |
1822 | * If pid_alive fails, then pointers within the task structure | |
1823 | * can be stale and must not be dereferenced. | |
e69f6186 YB |
1824 | * |
1825 | * Return: 1 if the process is alive. 0 otherwise. | |
1da177e4 | 1826 | */ |
ad36d282 | 1827 | static inline int pid_alive(const struct task_struct *p) |
1da177e4 | 1828 | { |
92476d7f | 1829 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1830 | } |
1831 | ||
f400e198 | 1832 | /** |
b460cbc5 | 1833 | * is_global_init - check if a task structure is init |
3260259f H |
1834 | * @tsk: Task structure to be checked. |
1835 | * | |
1836 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
1837 | * |
1838 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 1839 | */ |
e868171a | 1840 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
1841 | { |
1842 | return tsk->pid == 1; | |
1843 | } | |
b460cbc5 | 1844 | |
9ec52099 CLG |
1845 | extern struct pid *cad_pid; |
1846 | ||
1da177e4 | 1847 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1848 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1849 | |
158d9ebd | 1850 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1851 | |
1852 | static inline void put_task_struct(struct task_struct *t) | |
1853 | { | |
1854 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1855 | __put_task_struct(t); |
e56d0903 | 1856 | } |
1da177e4 | 1857 | |
6a61671b FW |
1858 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
1859 | extern void task_cputime(struct task_struct *t, | |
1860 | cputime_t *utime, cputime_t *stime); | |
1861 | extern void task_cputime_scaled(struct task_struct *t, | |
1862 | cputime_t *utimescaled, cputime_t *stimescaled); | |
1863 | extern cputime_t task_gtime(struct task_struct *t); | |
1864 | #else | |
6fac4829 FW |
1865 | static inline void task_cputime(struct task_struct *t, |
1866 | cputime_t *utime, cputime_t *stime) | |
1867 | { | |
1868 | if (utime) | |
1869 | *utime = t->utime; | |
1870 | if (stime) | |
1871 | *stime = t->stime; | |
1872 | } | |
1873 | ||
1874 | static inline void task_cputime_scaled(struct task_struct *t, | |
1875 | cputime_t *utimescaled, | |
1876 | cputime_t *stimescaled) | |
1877 | { | |
1878 | if (utimescaled) | |
1879 | *utimescaled = t->utimescaled; | |
1880 | if (stimescaled) | |
1881 | *stimescaled = t->stimescaled; | |
1882 | } | |
6a61671b FW |
1883 | |
1884 | static inline cputime_t task_gtime(struct task_struct *t) | |
1885 | { | |
1886 | return t->gtime; | |
1887 | } | |
1888 | #endif | |
e80d0a1a FW |
1889 | extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); |
1890 | extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); | |
49048622 | 1891 | |
1da177e4 LT |
1892 | /* |
1893 | * Per process flags | |
1894 | */ | |
1da177e4 | 1895 | #define PF_EXITING 0x00000004 /* getting shut down */ |
778e9a9c | 1896 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1897 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
21aa9af0 | 1898 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1da177e4 | 1899 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
4db96cf0 | 1900 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1da177e4 LT |
1901 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
1902 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1903 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1904 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
72fa5997 | 1905 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */ |
1da177e4 | 1906 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
774a1221 | 1907 | #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */ |
1da177e4 LT |
1908 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1909 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1910 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1911 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
21caf2fc | 1912 | #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */ |
1da177e4 | 1913 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 1914 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
1915 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
1916 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
1917 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ | |
1918 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ | |
14a40ffc | 1919 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */ |
4db96cf0 | 1920 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
61a87122 | 1921 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
58a69cb4 | 1922 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
2b44c4db | 1923 | #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */ |
1da177e4 LT |
1924 | |
1925 | /* | |
1926 | * Only the _current_ task can read/write to tsk->flags, but other | |
1927 | * tasks can access tsk->flags in readonly mode for example | |
1928 | * with tsk_used_math (like during threaded core dumping). | |
1929 | * There is however an exception to this rule during ptrace | |
1930 | * or during fork: the ptracer task is allowed to write to the | |
1931 | * child->flags of its traced child (same goes for fork, the parent | |
1932 | * can write to the child->flags), because we're guaranteed the | |
1933 | * child is not running and in turn not changing child->flags | |
1934 | * at the same time the parent does it. | |
1935 | */ | |
1936 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1937 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1938 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1939 | #define set_used_math() set_stopped_child_used_math(current) | |
1940 | #define conditional_stopped_child_used_math(condition, child) \ | |
1941 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1942 | #define conditional_used_math(condition) \ | |
1943 | conditional_stopped_child_used_math(condition, current) | |
1944 | #define copy_to_stopped_child_used_math(child) \ | |
1945 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1946 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1947 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1948 | #define used_math() tsk_used_math(current) | |
1949 | ||
21caf2fc ML |
1950 | /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags */ |
1951 | static inline gfp_t memalloc_noio_flags(gfp_t flags) | |
1952 | { | |
1953 | if (unlikely(current->flags & PF_MEMALLOC_NOIO)) | |
1954 | flags &= ~__GFP_IO; | |
1955 | return flags; | |
1956 | } | |
1957 | ||
1958 | static inline unsigned int memalloc_noio_save(void) | |
1959 | { | |
1960 | unsigned int flags = current->flags & PF_MEMALLOC_NOIO; | |
1961 | current->flags |= PF_MEMALLOC_NOIO; | |
1962 | return flags; | |
1963 | } | |
1964 | ||
1965 | static inline void memalloc_noio_restore(unsigned int flags) | |
1966 | { | |
1967 | current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags; | |
1968 | } | |
1969 | ||
e5c1902e | 1970 | /* |
a8f072c1 | 1971 | * task->jobctl flags |
e5c1902e | 1972 | */ |
a8f072c1 | 1973 | #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */ |
e5c1902e | 1974 | |
a8f072c1 TH |
1975 | #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */ |
1976 | #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */ | |
1977 | #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */ | |
73ddff2b | 1978 | #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */ |
fb1d910c | 1979 | #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */ |
a8f072c1 | 1980 | #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */ |
544b2c91 | 1981 | #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */ |
a8f072c1 TH |
1982 | |
1983 | #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT) | |
1984 | #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT) | |
1985 | #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT) | |
73ddff2b | 1986 | #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT) |
fb1d910c | 1987 | #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT) |
a8f072c1 | 1988 | #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT) |
544b2c91 | 1989 | #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT) |
a8f072c1 | 1990 | |
fb1d910c | 1991 | #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY) |
73ddff2b | 1992 | #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK) |
3759a0d9 | 1993 | |
7dd3db54 TH |
1994 | extern bool task_set_jobctl_pending(struct task_struct *task, |
1995 | unsigned int mask); | |
73ddff2b | 1996 | extern void task_clear_jobctl_trapping(struct task_struct *task); |
3759a0d9 TH |
1997 | extern void task_clear_jobctl_pending(struct task_struct *task, |
1998 | unsigned int mask); | |
39efa3ef | 1999 | |
a57eb940 | 2000 | #ifdef CONFIG_PREEMPT_RCU |
f41d911f PM |
2001 | |
2002 | #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ | |
1aa03f11 | 2003 | #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ |
f41d911f PM |
2004 | |
2005 | static inline void rcu_copy_process(struct task_struct *p) | |
2006 | { | |
2007 | p->rcu_read_lock_nesting = 0; | |
2008 | p->rcu_read_unlock_special = 0; | |
a57eb940 | 2009 | #ifdef CONFIG_TREE_PREEMPT_RCU |
dd5d19ba | 2010 | p->rcu_blocked_node = NULL; |
24278d14 PM |
2011 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
2012 | #ifdef CONFIG_RCU_BOOST | |
2013 | p->rcu_boost_mutex = NULL; | |
2014 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
f41d911f PM |
2015 | INIT_LIST_HEAD(&p->rcu_node_entry); |
2016 | } | |
2017 | ||
f41d911f PM |
2018 | #else |
2019 | ||
2020 | static inline void rcu_copy_process(struct task_struct *p) | |
2021 | { | |
2022 | } | |
2023 | ||
2024 | #endif | |
2025 | ||
907aed48 MG |
2026 | static inline void tsk_restore_flags(struct task_struct *task, |
2027 | unsigned long orig_flags, unsigned long flags) | |
2028 | { | |
2029 | task->flags &= ~flags; | |
2030 | task->flags |= orig_flags & flags; | |
2031 | } | |
2032 | ||
1da177e4 | 2033 | #ifdef CONFIG_SMP |
1e1b6c51 KM |
2034 | extern void do_set_cpus_allowed(struct task_struct *p, |
2035 | const struct cpumask *new_mask); | |
2036 | ||
cd8ba7cd | 2037 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 2038 | const struct cpumask *new_mask); |
1da177e4 | 2039 | #else |
1e1b6c51 KM |
2040 | static inline void do_set_cpus_allowed(struct task_struct *p, |
2041 | const struct cpumask *new_mask) | |
2042 | { | |
2043 | } | |
cd8ba7cd | 2044 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 2045 | const struct cpumask *new_mask) |
1da177e4 | 2046 | { |
96f874e2 | 2047 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
2048 | return -EINVAL; |
2049 | return 0; | |
2050 | } | |
2051 | #endif | |
e0ad9556 | 2052 | |
3451d024 | 2053 | #ifdef CONFIG_NO_HZ_COMMON |
5167e8d5 PZ |
2054 | void calc_load_enter_idle(void); |
2055 | void calc_load_exit_idle(void); | |
2056 | #else | |
2057 | static inline void calc_load_enter_idle(void) { } | |
2058 | static inline void calc_load_exit_idle(void) { } | |
3451d024 | 2059 | #endif /* CONFIG_NO_HZ_COMMON */ |
5167e8d5 | 2060 | |
e0ad9556 | 2061 | #ifndef CONFIG_CPUMASK_OFFSTACK |
cd8ba7cd MT |
2062 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
2063 | { | |
2064 | return set_cpus_allowed_ptr(p, &new_mask); | |
2065 | } | |
e0ad9556 | 2066 | #endif |
1da177e4 | 2067 | |
b342501c | 2068 | /* |
c676329a PZ |
2069 | * Do not use outside of architecture code which knows its limitations. |
2070 | * | |
2071 | * sched_clock() has no promise of monotonicity or bounded drift between | |
2072 | * CPUs, use (which you should not) requires disabling IRQs. | |
2073 | * | |
2074 | * Please use one of the three interfaces below. | |
b342501c | 2075 | */ |
1bbfa6f2 | 2076 | extern unsigned long long notrace sched_clock(void); |
c676329a | 2077 | /* |
489a71b0 | 2078 | * See the comment in kernel/sched/clock.c |
c676329a PZ |
2079 | */ |
2080 | extern u64 cpu_clock(int cpu); | |
2081 | extern u64 local_clock(void); | |
2082 | extern u64 sched_clock_cpu(int cpu); | |
2083 | ||
e436d800 | 2084 | |
c1955a3d | 2085 | extern void sched_clock_init(void); |
3e51f33f | 2086 | |
c1955a3d | 2087 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
3e51f33f PZ |
2088 | static inline void sched_clock_tick(void) |
2089 | { | |
2090 | } | |
2091 | ||
2092 | static inline void sched_clock_idle_sleep_event(void) | |
2093 | { | |
2094 | } | |
2095 | ||
2096 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) | |
2097 | { | |
2098 | } | |
2099 | #else | |
c676329a PZ |
2100 | /* |
2101 | * Architectures can set this to 1 if they have specified | |
2102 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, | |
2103 | * but then during bootup it turns out that sched_clock() | |
2104 | * is reliable after all: | |
2105 | */ | |
35af99e6 PZ |
2106 | extern int sched_clock_stable(void); |
2107 | extern void set_sched_clock_stable(void); | |
2108 | extern void clear_sched_clock_stable(void); | |
c676329a | 2109 | |
3e51f33f PZ |
2110 | extern void sched_clock_tick(void); |
2111 | extern void sched_clock_idle_sleep_event(void); | |
2112 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
2113 | #endif | |
2114 | ||
b52bfee4 VP |
2115 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
2116 | /* | |
2117 | * An i/f to runtime opt-in for irq time accounting based off of sched_clock. | |
2118 | * The reason for this explicit opt-in is not to have perf penalty with | |
2119 | * slow sched_clocks. | |
2120 | */ | |
2121 | extern void enable_sched_clock_irqtime(void); | |
2122 | extern void disable_sched_clock_irqtime(void); | |
2123 | #else | |
2124 | static inline void enable_sched_clock_irqtime(void) {} | |
2125 | static inline void disable_sched_clock_irqtime(void) {} | |
2126 | #endif | |
2127 | ||
36c8b586 | 2128 | extern unsigned long long |
41b86e9c | 2129 | task_sched_runtime(struct task_struct *task); |
1da177e4 LT |
2130 | |
2131 | /* sched_exec is called by processes performing an exec */ | |
2132 | #ifdef CONFIG_SMP | |
2133 | extern void sched_exec(void); | |
2134 | #else | |
2135 | #define sched_exec() {} | |
2136 | #endif | |
2137 | ||
2aa44d05 IM |
2138 | extern void sched_clock_idle_sleep_event(void); |
2139 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 2140 | |
1da177e4 LT |
2141 | #ifdef CONFIG_HOTPLUG_CPU |
2142 | extern void idle_task_exit(void); | |
2143 | #else | |
2144 | static inline void idle_task_exit(void) {} | |
2145 | #endif | |
2146 | ||
3451d024 | 2147 | #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP) |
1c20091e | 2148 | extern void wake_up_nohz_cpu(int cpu); |
06d8308c | 2149 | #else |
1c20091e | 2150 | static inline void wake_up_nohz_cpu(int cpu) { } |
06d8308c TG |
2151 | #endif |
2152 | ||
ce831b38 FW |
2153 | #ifdef CONFIG_NO_HZ_FULL |
2154 | extern bool sched_can_stop_tick(void); | |
265f22a9 | 2155 | extern u64 scheduler_tick_max_deferment(void); |
ce831b38 FW |
2156 | #else |
2157 | static inline bool sched_can_stop_tick(void) { return false; } | |
06d8308c TG |
2158 | #endif |
2159 | ||
5091faa4 | 2160 | #ifdef CONFIG_SCHED_AUTOGROUP |
5091faa4 MG |
2161 | extern void sched_autogroup_create_attach(struct task_struct *p); |
2162 | extern void sched_autogroup_detach(struct task_struct *p); | |
2163 | extern void sched_autogroup_fork(struct signal_struct *sig); | |
2164 | extern void sched_autogroup_exit(struct signal_struct *sig); | |
2165 | #ifdef CONFIG_PROC_FS | |
2166 | extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); | |
2e5b5b3a | 2167 | extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice); |
5091faa4 MG |
2168 | #endif |
2169 | #else | |
2170 | static inline void sched_autogroup_create_attach(struct task_struct *p) { } | |
2171 | static inline void sched_autogroup_detach(struct task_struct *p) { } | |
2172 | static inline void sched_autogroup_fork(struct signal_struct *sig) { } | |
2173 | static inline void sched_autogroup_exit(struct signal_struct *sig) { } | |
2174 | #endif | |
2175 | ||
fa93384f | 2176 | extern int yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
2177 | extern void set_user_nice(struct task_struct *p, long nice); |
2178 | extern int task_prio(const struct task_struct *p); | |
d0ea0268 DY |
2179 | /** |
2180 | * task_nice - return the nice value of a given task. | |
2181 | * @p: the task in question. | |
2182 | * | |
2183 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
2184 | */ | |
2185 | static inline int task_nice(const struct task_struct *p) | |
2186 | { | |
2187 | return PRIO_TO_NICE((p)->static_prio); | |
2188 | } | |
36c8b586 IM |
2189 | extern int can_nice(const struct task_struct *p, const int nice); |
2190 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 2191 | extern int idle_cpu(int cpu); |
fe7de49f KM |
2192 | extern int sched_setscheduler(struct task_struct *, int, |
2193 | const struct sched_param *); | |
961ccddd | 2194 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
fe7de49f | 2195 | const struct sched_param *); |
d50dde5a DF |
2196 | extern int sched_setattr(struct task_struct *, |
2197 | const struct sched_attr *); | |
36c8b586 | 2198 | extern struct task_struct *idle_task(int cpu); |
c4f30608 PM |
2199 | /** |
2200 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 2201 | * @p: the task in question. |
e69f6186 YB |
2202 | * |
2203 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 2204 | */ |
7061ca3b | 2205 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 PM |
2206 | { |
2207 | return p->pid == 0; | |
2208 | } | |
36c8b586 IM |
2209 | extern struct task_struct *curr_task(int cpu); |
2210 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
2211 | |
2212 | void yield(void); | |
2213 | ||
2214 | /* | |
2215 | * The default (Linux) execution domain. | |
2216 | */ | |
2217 | extern struct exec_domain default_exec_domain; | |
2218 | ||
2219 | union thread_union { | |
2220 | struct thread_info thread_info; | |
2221 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
2222 | }; | |
2223 | ||
2224 | #ifndef __HAVE_ARCH_KSTACK_END | |
2225 | static inline int kstack_end(void *addr) | |
2226 | { | |
2227 | /* Reliable end of stack detection: | |
2228 | * Some APM bios versions misalign the stack | |
2229 | */ | |
2230 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
2231 | } | |
2232 | #endif | |
2233 | ||
2234 | extern union thread_union init_thread_union; | |
2235 | extern struct task_struct init_task; | |
2236 | ||
2237 | extern struct mm_struct init_mm; | |
2238 | ||
198fe21b PE |
2239 | extern struct pid_namespace init_pid_ns; |
2240 | ||
2241 | /* | |
2242 | * find a task by one of its numerical ids | |
2243 | * | |
198fe21b PE |
2244 | * find_task_by_pid_ns(): |
2245 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
2246 | * find_task_by_vpid(): |
2247 | * finds a task by its virtual pid | |
198fe21b | 2248 | * |
e49859e7 | 2249 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
2250 | */ |
2251 | ||
228ebcbe PE |
2252 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
2253 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
2254 | struct pid_namespace *ns); | |
198fe21b | 2255 | |
1da177e4 | 2256 | /* per-UID process charging. */ |
7b44ab97 | 2257 | extern struct user_struct * alloc_uid(kuid_t); |
1da177e4 LT |
2258 | static inline struct user_struct *get_uid(struct user_struct *u) |
2259 | { | |
2260 | atomic_inc(&u->__count); | |
2261 | return u; | |
2262 | } | |
2263 | extern void free_uid(struct user_struct *); | |
1da177e4 LT |
2264 | |
2265 | #include <asm/current.h> | |
2266 | ||
f0af911a | 2267 | extern void xtime_update(unsigned long ticks); |
1da177e4 | 2268 | |
b3c97528 HH |
2269 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
2270 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 2271 | extern void wake_up_new_task(struct task_struct *tsk); |
1da177e4 LT |
2272 | #ifdef CONFIG_SMP |
2273 | extern void kick_process(struct task_struct *tsk); | |
2274 | #else | |
2275 | static inline void kick_process(struct task_struct *tsk) { } | |
2276 | #endif | |
aab03e05 | 2277 | extern int sched_fork(unsigned long clone_flags, struct task_struct *p); |
ad46c2c4 | 2278 | extern void sched_dead(struct task_struct *p); |
1da177e4 | 2279 | |
1da177e4 LT |
2280 | extern void proc_caches_init(void); |
2281 | extern void flush_signals(struct task_struct *); | |
3bcac026 | 2282 | extern void __flush_signals(struct task_struct *); |
10ab825b | 2283 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
2284 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
2285 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
2286 | ||
2287 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
2288 | { | |
2289 | unsigned long flags; | |
2290 | int ret; | |
2291 | ||
2292 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
2293 | ret = dequeue_signal(tsk, mask, info); | |
2294 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
2295 | ||
2296 | return ret; | |
53c8f9f1 | 2297 | } |
1da177e4 LT |
2298 | |
2299 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
2300 | sigset_t *mask); | |
2301 | extern void unblock_all_signals(void); | |
2302 | extern void release_task(struct task_struct * p); | |
2303 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1da177e4 LT |
2304 | extern int force_sigsegv(int, struct task_struct *); |
2305 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 | 2306 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
c4b92fc1 | 2307 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
d178bc3a SH |
2308 | extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *, |
2309 | const struct cred *, u32); | |
c4b92fc1 EB |
2310 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
2311 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 2312 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
86773473 | 2313 | extern __must_check bool do_notify_parent(struct task_struct *, int); |
a7f0765e | 2314 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); |
1da177e4 | 2315 | extern void force_sig(int, struct task_struct *); |
1da177e4 | 2316 | extern int send_sig(int, struct task_struct *, int); |
09faef11 | 2317 | extern int zap_other_threads(struct task_struct *p); |
1da177e4 LT |
2318 | extern struct sigqueue *sigqueue_alloc(void); |
2319 | extern void sigqueue_free(struct sigqueue *); | |
ac5c2153 | 2320 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
9ac95f2f | 2321 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 | 2322 | |
51a7b448 AV |
2323 | static inline void restore_saved_sigmask(void) |
2324 | { | |
2325 | if (test_and_clear_restore_sigmask()) | |
77097ae5 | 2326 | __set_current_blocked(¤t->saved_sigmask); |
51a7b448 AV |
2327 | } |
2328 | ||
b7f9a11a AV |
2329 | static inline sigset_t *sigmask_to_save(void) |
2330 | { | |
2331 | sigset_t *res = ¤t->blocked; | |
2332 | if (unlikely(test_restore_sigmask())) | |
2333 | res = ¤t->saved_sigmask; | |
2334 | return res; | |
2335 | } | |
2336 | ||
9ec52099 CLG |
2337 | static inline int kill_cad_pid(int sig, int priv) |
2338 | { | |
2339 | return kill_pid(cad_pid, sig, priv); | |
2340 | } | |
2341 | ||
1da177e4 LT |
2342 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
2343 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
2344 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
2345 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
2346 | ||
2a855dd0 SAS |
2347 | /* |
2348 | * True if we are on the alternate signal stack. | |
2349 | */ | |
1da177e4 LT |
2350 | static inline int on_sig_stack(unsigned long sp) |
2351 | { | |
2a855dd0 SAS |
2352 | #ifdef CONFIG_STACK_GROWSUP |
2353 | return sp >= current->sas_ss_sp && | |
2354 | sp - current->sas_ss_sp < current->sas_ss_size; | |
2355 | #else | |
2356 | return sp > current->sas_ss_sp && | |
2357 | sp - current->sas_ss_sp <= current->sas_ss_size; | |
2358 | #endif | |
1da177e4 LT |
2359 | } |
2360 | ||
2361 | static inline int sas_ss_flags(unsigned long sp) | |
2362 | { | |
2363 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
2364 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
2365 | } | |
2366 | ||
5a1b98d3 AV |
2367 | static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig) |
2368 | { | |
2369 | if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp)) | |
2370 | #ifdef CONFIG_STACK_GROWSUP | |
2371 | return current->sas_ss_sp; | |
2372 | #else | |
2373 | return current->sas_ss_sp + current->sas_ss_size; | |
2374 | #endif | |
2375 | return sp; | |
2376 | } | |
2377 | ||
1da177e4 LT |
2378 | /* |
2379 | * Routines for handling mm_structs | |
2380 | */ | |
2381 | extern struct mm_struct * mm_alloc(void); | |
2382 | ||
2383 | /* mmdrop drops the mm and the page tables */ | |
b3c97528 | 2384 | extern void __mmdrop(struct mm_struct *); |
1da177e4 LT |
2385 | static inline void mmdrop(struct mm_struct * mm) |
2386 | { | |
6fb43d7b | 2387 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
2388 | __mmdrop(mm); |
2389 | } | |
2390 | ||
2391 | /* mmput gets rid of the mappings and all user-space */ | |
2392 | extern void mmput(struct mm_struct *); | |
2393 | /* Grab a reference to a task's mm, if it is not already going away */ | |
2394 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
8cdb878d CY |
2395 | /* |
2396 | * Grab a reference to a task's mm, if it is not already going away | |
2397 | * and ptrace_may_access with the mode parameter passed to it | |
2398 | * succeeds. | |
2399 | */ | |
2400 | extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode); | |
1da177e4 LT |
2401 | /* Remove the current tasks stale references to the old mm_struct */ |
2402 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
2403 | ||
6f2c55b8 | 2404 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
afa86fc4 | 2405 | struct task_struct *); |
1da177e4 LT |
2406 | extern void flush_thread(void); |
2407 | extern void exit_thread(void); | |
2408 | ||
1da177e4 | 2409 | extern void exit_files(struct task_struct *); |
a7e5328a | 2410 | extern void __cleanup_sighand(struct sighand_struct *); |
cbaffba1 | 2411 | |
1da177e4 | 2412 | extern void exit_itimers(struct signal_struct *); |
cbaffba1 | 2413 | extern void flush_itimer_signals(void); |
1da177e4 | 2414 | |
9402c95f | 2415 | extern void do_group_exit(int); |
1da177e4 | 2416 | |
c4ad8f98 | 2417 | extern int do_execve(struct filename *, |
d7627467 | 2418 | const char __user * const __user *, |
da3d4c5f | 2419 | const char __user * const __user *); |
e80d6661 | 2420 | extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *); |
36c8b586 | 2421 | struct task_struct *fork_idle(int); |
2aa3a7f8 | 2422 | extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
1da177e4 | 2423 | |
82b89778 AH |
2424 | extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); |
2425 | static inline void set_task_comm(struct task_struct *tsk, const char *from) | |
2426 | { | |
2427 | __set_task_comm(tsk, from, false); | |
2428 | } | |
59714d65 | 2429 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
2430 | |
2431 | #ifdef CONFIG_SMP | |
317f3941 | 2432 | void scheduler_ipi(void); |
85ba2d86 | 2433 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 2434 | #else |
184748cc | 2435 | static inline void scheduler_ipi(void) { } |
85ba2d86 RM |
2436 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
2437 | long match_state) | |
2438 | { | |
2439 | return 1; | |
2440 | } | |
1da177e4 LT |
2441 | #endif |
2442 | ||
05725f7e JP |
2443 | #define next_task(p) \ |
2444 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
1da177e4 LT |
2445 | |
2446 | #define for_each_process(p) \ | |
2447 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
2448 | ||
5bb459bb | 2449 | extern bool current_is_single_threaded(void); |
d84f4f99 | 2450 | |
1da177e4 LT |
2451 | /* |
2452 | * Careful: do_each_thread/while_each_thread is a double loop so | |
2453 | * 'break' will not work as expected - use goto instead. | |
2454 | */ | |
2455 | #define do_each_thread(g, t) \ | |
2456 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
2457 | ||
2458 | #define while_each_thread(g, t) \ | |
2459 | while ((t = next_thread(t)) != g) | |
2460 | ||
0c740d0a ON |
2461 | #define __for_each_thread(signal, t) \ |
2462 | list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node) | |
2463 | ||
2464 | #define for_each_thread(p, t) \ | |
2465 | __for_each_thread((p)->signal, t) | |
2466 | ||
2467 | /* Careful: this is a double loop, 'break' won't work as expected. */ | |
2468 | #define for_each_process_thread(p, t) \ | |
2469 | for_each_process(p) for_each_thread(p, t) | |
2470 | ||
7e49827c ON |
2471 | static inline int get_nr_threads(struct task_struct *tsk) |
2472 | { | |
b3ac022c | 2473 | return tsk->signal->nr_threads; |
7e49827c ON |
2474 | } |
2475 | ||
087806b1 ON |
2476 | static inline bool thread_group_leader(struct task_struct *p) |
2477 | { | |
2478 | return p->exit_signal >= 0; | |
2479 | } | |
1da177e4 | 2480 | |
0804ef4b EB |
2481 | /* Do to the insanities of de_thread it is possible for a process |
2482 | * to have the pid of the thread group leader without actually being | |
2483 | * the thread group leader. For iteration through the pids in proc | |
2484 | * all we care about is that we have a task with the appropriate | |
2485 | * pid, we don't actually care if we have the right task. | |
2486 | */ | |
e1403b8e | 2487 | static inline bool has_group_leader_pid(struct task_struct *p) |
0804ef4b | 2488 | { |
e1403b8e | 2489 | return task_pid(p) == p->signal->leader_pid; |
0804ef4b EB |
2490 | } |
2491 | ||
bac0abd6 | 2492 | static inline |
e1403b8e | 2493 | bool same_thread_group(struct task_struct *p1, struct task_struct *p2) |
bac0abd6 | 2494 | { |
e1403b8e | 2495 | return p1->signal == p2->signal; |
bac0abd6 PE |
2496 | } |
2497 | ||
36c8b586 | 2498 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 | 2499 | { |
05725f7e JP |
2500 | return list_entry_rcu(p->thread_group.next, |
2501 | struct task_struct, thread_group); | |
47e65328 ON |
2502 | } |
2503 | ||
e868171a | 2504 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 2505 | { |
47e65328 | 2506 | return list_empty(&p->thread_group); |
1da177e4 LT |
2507 | } |
2508 | ||
2509 | #define delay_group_leader(p) \ | |
2510 | (thread_group_leader(p) && !thread_group_empty(p)) | |
2511 | ||
1da177e4 | 2512 | /* |
260ea101 | 2513 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 2514 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 | 2515 | * pins the final release of task.io_context. Also protects ->cpuset and |
d68b46fe | 2516 | * ->cgroup.subsys[]. And ->vfork_done. |
1da177e4 LT |
2517 | * |
2518 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
2519 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
2520 | * neither inside nor outside. | |
2521 | */ | |
2522 | static inline void task_lock(struct task_struct *p) | |
2523 | { | |
2524 | spin_lock(&p->alloc_lock); | |
2525 | } | |
2526 | ||
2527 | static inline void task_unlock(struct task_struct *p) | |
2528 | { | |
2529 | spin_unlock(&p->alloc_lock); | |
2530 | } | |
2531 | ||
b8ed374e | 2532 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, |
f63ee72e ON |
2533 | unsigned long *flags); |
2534 | ||
9388dc30 AV |
2535 | static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
2536 | unsigned long *flags) | |
2537 | { | |
2538 | struct sighand_struct *ret; | |
2539 | ||
2540 | ret = __lock_task_sighand(tsk, flags); | |
2541 | (void)__cond_lock(&tsk->sighand->siglock, ret); | |
2542 | return ret; | |
2543 | } | |
b8ed374e | 2544 | |
f63ee72e ON |
2545 | static inline void unlock_task_sighand(struct task_struct *tsk, |
2546 | unsigned long *flags) | |
2547 | { | |
2548 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
2549 | } | |
2550 | ||
4714d1d3 | 2551 | #ifdef CONFIG_CGROUPS |
257058ae | 2552 | static inline void threadgroup_change_begin(struct task_struct *tsk) |
4714d1d3 | 2553 | { |
257058ae | 2554 | down_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2555 | } |
257058ae | 2556 | static inline void threadgroup_change_end(struct task_struct *tsk) |
4714d1d3 | 2557 | { |
257058ae | 2558 | up_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2559 | } |
77e4ef99 TH |
2560 | |
2561 | /** | |
2562 | * threadgroup_lock - lock threadgroup | |
2563 | * @tsk: member task of the threadgroup to lock | |
2564 | * | |
2565 | * Lock the threadgroup @tsk belongs to. No new task is allowed to enter | |
2566 | * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or | |
e56fb287 ON |
2567 | * change ->group_leader/pid. This is useful for cases where the threadgroup |
2568 | * needs to stay stable across blockable operations. | |
77e4ef99 TH |
2569 | * |
2570 | * fork and exit paths explicitly call threadgroup_change_{begin|end}() for | |
2571 | * synchronization. While held, no new task will be added to threadgroup | |
2572 | * and no existing live task will have its PF_EXITING set. | |
2573 | * | |
e56fb287 ON |
2574 | * de_thread() does threadgroup_change_{begin|end}() when a non-leader |
2575 | * sub-thread becomes a new leader. | |
77e4ef99 | 2576 | */ |
257058ae | 2577 | static inline void threadgroup_lock(struct task_struct *tsk) |
4714d1d3 | 2578 | { |
257058ae | 2579 | down_write(&tsk->signal->group_rwsem); |
4714d1d3 | 2580 | } |
77e4ef99 TH |
2581 | |
2582 | /** | |
2583 | * threadgroup_unlock - unlock threadgroup | |
2584 | * @tsk: member task of the threadgroup to unlock | |
2585 | * | |
2586 | * Reverse threadgroup_lock(). | |
2587 | */ | |
257058ae | 2588 | static inline void threadgroup_unlock(struct task_struct *tsk) |
4714d1d3 | 2589 | { |
257058ae | 2590 | up_write(&tsk->signal->group_rwsem); |
4714d1d3 BB |
2591 | } |
2592 | #else | |
257058ae TH |
2593 | static inline void threadgroup_change_begin(struct task_struct *tsk) {} |
2594 | static inline void threadgroup_change_end(struct task_struct *tsk) {} | |
2595 | static inline void threadgroup_lock(struct task_struct *tsk) {} | |
2596 | static inline void threadgroup_unlock(struct task_struct *tsk) {} | |
4714d1d3 BB |
2597 | #endif |
2598 | ||
f037360f AV |
2599 | #ifndef __HAVE_THREAD_FUNCTIONS |
2600 | ||
f7e4217b RZ |
2601 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
2602 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 2603 | |
10ebffde AV |
2604 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2605 | { | |
2606 | *task_thread_info(p) = *task_thread_info(org); | |
2607 | task_thread_info(p)->task = p; | |
2608 | } | |
2609 | ||
2610 | static inline unsigned long *end_of_stack(struct task_struct *p) | |
2611 | { | |
f7e4217b | 2612 | return (unsigned long *)(task_thread_info(p) + 1); |
10ebffde AV |
2613 | } |
2614 | ||
f037360f AV |
2615 | #endif |
2616 | ||
8b05c7e6 FT |
2617 | static inline int object_is_on_stack(void *obj) |
2618 | { | |
2619 | void *stack = task_stack_page(current); | |
2620 | ||
2621 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); | |
2622 | } | |
2623 | ||
8c9843e5 BH |
2624 | extern void thread_info_cache_init(void); |
2625 | ||
7c9f8861 ES |
2626 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2627 | static inline unsigned long stack_not_used(struct task_struct *p) | |
2628 | { | |
2629 | unsigned long *n = end_of_stack(p); | |
2630 | ||
2631 | do { /* Skip over canary */ | |
2632 | n++; | |
2633 | } while (!*n); | |
2634 | ||
2635 | return (unsigned long)n - (unsigned long)end_of_stack(p); | |
2636 | } | |
2637 | #endif | |
2638 | ||
1da177e4 LT |
2639 | /* set thread flags in other task's structures |
2640 | * - see asm/thread_info.h for TIF_xxxx flags available | |
2641 | */ | |
2642 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2643 | { | |
a1261f54 | 2644 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2645 | } |
2646 | ||
2647 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2648 | { | |
a1261f54 | 2649 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2650 | } |
2651 | ||
2652 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2653 | { | |
a1261f54 | 2654 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2655 | } |
2656 | ||
2657 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2658 | { | |
a1261f54 | 2659 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2660 | } |
2661 | ||
2662 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2663 | { | |
a1261f54 | 2664 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2665 | } |
2666 | ||
2667 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2668 | { | |
2669 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2670 | } | |
2671 | ||
2672 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2673 | { | |
2674 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2675 | } | |
2676 | ||
8ae121ac GH |
2677 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2678 | { | |
2679 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2680 | } | |
2681 | ||
690cc3ff EB |
2682 | static inline int restart_syscall(void) |
2683 | { | |
2684 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
2685 | return -ERESTARTNOINTR; | |
2686 | } | |
2687 | ||
1da177e4 LT |
2688 | static inline int signal_pending(struct task_struct *p) |
2689 | { | |
2690 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
2691 | } | |
f776d12d | 2692 | |
d9588725 RM |
2693 | static inline int __fatal_signal_pending(struct task_struct *p) |
2694 | { | |
2695 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
2696 | } | |
f776d12d MW |
2697 | |
2698 | static inline int fatal_signal_pending(struct task_struct *p) | |
2699 | { | |
2700 | return signal_pending(p) && __fatal_signal_pending(p); | |
2701 | } | |
2702 | ||
16882c1e ON |
2703 | static inline int signal_pending_state(long state, struct task_struct *p) |
2704 | { | |
2705 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
2706 | return 0; | |
2707 | if (!signal_pending(p)) | |
2708 | return 0; | |
2709 | ||
16882c1e ON |
2710 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2711 | } | |
2712 | ||
1da177e4 LT |
2713 | /* |
2714 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2715 | * explicit rescheduling in places that are safe. The return | |
2716 | * value indicates whether a reschedule was done in fact. | |
2717 | * cond_resched_lock() will drop the spinlock before scheduling, | |
2718 | * cond_resched_softirq() will enable bhs before scheduling. | |
2719 | */ | |
c3921ab7 | 2720 | extern int _cond_resched(void); |
6f80bd98 | 2721 | |
613afbf8 FW |
2722 | #define cond_resched() ({ \ |
2723 | __might_sleep(__FILE__, __LINE__, 0); \ | |
2724 | _cond_resched(); \ | |
2725 | }) | |
6f80bd98 | 2726 | |
613afbf8 FW |
2727 | extern int __cond_resched_lock(spinlock_t *lock); |
2728 | ||
bdd4e85d | 2729 | #ifdef CONFIG_PREEMPT_COUNT |
716a4234 | 2730 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET |
02b67cc3 | 2731 | #else |
716a4234 | 2732 | #define PREEMPT_LOCK_OFFSET 0 |
02b67cc3 | 2733 | #endif |
716a4234 | 2734 | |
613afbf8 | 2735 | #define cond_resched_lock(lock) ({ \ |
716a4234 | 2736 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ |
613afbf8 FW |
2737 | __cond_resched_lock(lock); \ |
2738 | }) | |
2739 | ||
2740 | extern int __cond_resched_softirq(void); | |
2741 | ||
75e1056f VP |
2742 | #define cond_resched_softirq() ({ \ |
2743 | __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ | |
2744 | __cond_resched_softirq(); \ | |
613afbf8 | 2745 | }) |
1da177e4 | 2746 | |
f6f3c437 SH |
2747 | static inline void cond_resched_rcu(void) |
2748 | { | |
2749 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
2750 | rcu_read_unlock(); | |
2751 | cond_resched(); | |
2752 | rcu_read_lock(); | |
2753 | #endif | |
2754 | } | |
2755 | ||
1da177e4 LT |
2756 | /* |
2757 | * Does a critical section need to be broken due to another | |
95c354fe NP |
2758 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2759 | * but a general need for low latency) | |
1da177e4 | 2760 | */ |
95c354fe | 2761 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2762 | { |
95c354fe NP |
2763 | #ifdef CONFIG_PREEMPT |
2764 | return spin_is_contended(lock); | |
2765 | #else | |
1da177e4 | 2766 | return 0; |
95c354fe | 2767 | #endif |
1da177e4 LT |
2768 | } |
2769 | ||
ee761f62 TG |
2770 | /* |
2771 | * Idle thread specific functions to determine the need_resched | |
69dd0f84 | 2772 | * polling state. |
ee761f62 | 2773 | */ |
69dd0f84 | 2774 | #ifdef TIF_POLLING_NRFLAG |
ee761f62 TG |
2775 | static inline int tsk_is_polling(struct task_struct *p) |
2776 | { | |
2777 | return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG); | |
2778 | } | |
ea811747 PZ |
2779 | |
2780 | static inline void __current_set_polling(void) | |
3a98f871 TG |
2781 | { |
2782 | set_thread_flag(TIF_POLLING_NRFLAG); | |
2783 | } | |
2784 | ||
ea811747 PZ |
2785 | static inline bool __must_check current_set_polling_and_test(void) |
2786 | { | |
2787 | __current_set_polling(); | |
2788 | ||
2789 | /* | |
2790 | * Polling state must be visible before we test NEED_RESCHED, | |
2791 | * paired by resched_task() | |
ea811747 | 2792 | */ |
4e857c58 | 2793 | smp_mb__after_atomic(); |
ea811747 PZ |
2794 | |
2795 | return unlikely(tif_need_resched()); | |
2796 | } | |
2797 | ||
2798 | static inline void __current_clr_polling(void) | |
3a98f871 TG |
2799 | { |
2800 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
2801 | } | |
ea811747 PZ |
2802 | |
2803 | static inline bool __must_check current_clr_polling_and_test(void) | |
2804 | { | |
2805 | __current_clr_polling(); | |
2806 | ||
2807 | /* | |
2808 | * Polling state must be visible before we test NEED_RESCHED, | |
2809 | * paired by resched_task() | |
2810 | */ | |
4e857c58 | 2811 | smp_mb__after_atomic(); |
ea811747 PZ |
2812 | |
2813 | return unlikely(tif_need_resched()); | |
2814 | } | |
2815 | ||
ee761f62 TG |
2816 | #else |
2817 | static inline int tsk_is_polling(struct task_struct *p) { return 0; } | |
ea811747 PZ |
2818 | static inline void __current_set_polling(void) { } |
2819 | static inline void __current_clr_polling(void) { } | |
2820 | ||
2821 | static inline bool __must_check current_set_polling_and_test(void) | |
2822 | { | |
2823 | return unlikely(tif_need_resched()); | |
2824 | } | |
2825 | static inline bool __must_check current_clr_polling_and_test(void) | |
2826 | { | |
2827 | return unlikely(tif_need_resched()); | |
2828 | } | |
ee761f62 TG |
2829 | #endif |
2830 | ||
8cb75e0c PZ |
2831 | static inline void current_clr_polling(void) |
2832 | { | |
2833 | __current_clr_polling(); | |
2834 | ||
2835 | /* | |
2836 | * Ensure we check TIF_NEED_RESCHED after we clear the polling bit. | |
2837 | * Once the bit is cleared, we'll get IPIs with every new | |
2838 | * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also | |
2839 | * fold. | |
2840 | */ | |
2841 | smp_mb(); /* paired with resched_task() */ | |
2842 | ||
2843 | preempt_fold_need_resched(); | |
2844 | } | |
2845 | ||
75f93fed PZ |
2846 | static __always_inline bool need_resched(void) |
2847 | { | |
2848 | return unlikely(tif_need_resched()); | |
2849 | } | |
2850 | ||
f06febc9 FM |
2851 | /* |
2852 | * Thread group CPU time accounting. | |
2853 | */ | |
4cd4c1b4 | 2854 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
4da94d49 | 2855 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
f06febc9 | 2856 | |
490dea45 | 2857 | static inline void thread_group_cputime_init(struct signal_struct *sig) |
f06febc9 | 2858 | { |
ee30a7b2 | 2859 | raw_spin_lock_init(&sig->cputimer.lock); |
f06febc9 FM |
2860 | } |
2861 | ||
7bb44ade RM |
2862 | /* |
2863 | * Reevaluate whether the task has signals pending delivery. | |
2864 | * Wake the task if so. | |
2865 | * This is required every time the blocked sigset_t changes. | |
2866 | * callers must hold sighand->siglock. | |
2867 | */ | |
2868 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
2869 | extern void recalc_sigpending(void); |
2870 | ||
910ffdb1 ON |
2871 | extern void signal_wake_up_state(struct task_struct *t, unsigned int state); |
2872 | ||
2873 | static inline void signal_wake_up(struct task_struct *t, bool resume) | |
2874 | { | |
2875 | signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0); | |
2876 | } | |
2877 | static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume) | |
2878 | { | |
2879 | signal_wake_up_state(t, resume ? __TASK_TRACED : 0); | |
2880 | } | |
1da177e4 LT |
2881 | |
2882 | /* | |
2883 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2884 | */ | |
2885 | #ifdef CONFIG_SMP | |
2886 | ||
2887 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2888 | { | |
a1261f54 | 2889 | return task_thread_info(p)->cpu; |
1da177e4 LT |
2890 | } |
2891 | ||
b32e86b4 IM |
2892 | static inline int task_node(const struct task_struct *p) |
2893 | { | |
2894 | return cpu_to_node(task_cpu(p)); | |
2895 | } | |
2896 | ||
c65cc870 | 2897 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2898 | |
2899 | #else | |
2900 | ||
2901 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2902 | { | |
2903 | return 0; | |
2904 | } | |
2905 | ||
2906 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2907 | { | |
2908 | } | |
2909 | ||
2910 | #endif /* CONFIG_SMP */ | |
2911 | ||
96f874e2 RR |
2912 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2913 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2914 | |
7c941438 | 2915 | #ifdef CONFIG_CGROUP_SCHED |
07e06b01 | 2916 | extern struct task_group root_task_group; |
8323f26c | 2917 | #endif /* CONFIG_CGROUP_SCHED */ |
9b5b7751 | 2918 | |
54e99124 DG |
2919 | extern int task_can_switch_user(struct user_struct *up, |
2920 | struct task_struct *tsk); | |
2921 | ||
4b98d11b AD |
2922 | #ifdef CONFIG_TASK_XACCT |
2923 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2924 | { | |
940389b8 | 2925 | tsk->ioac.rchar += amt; |
4b98d11b AD |
2926 | } |
2927 | ||
2928 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2929 | { | |
940389b8 | 2930 | tsk->ioac.wchar += amt; |
4b98d11b AD |
2931 | } |
2932 | ||
2933 | static inline void inc_syscr(struct task_struct *tsk) | |
2934 | { | |
940389b8 | 2935 | tsk->ioac.syscr++; |
4b98d11b AD |
2936 | } |
2937 | ||
2938 | static inline void inc_syscw(struct task_struct *tsk) | |
2939 | { | |
940389b8 | 2940 | tsk->ioac.syscw++; |
4b98d11b AD |
2941 | } |
2942 | #else | |
2943 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2944 | { | |
2945 | } | |
2946 | ||
2947 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2948 | { | |
2949 | } | |
2950 | ||
2951 | static inline void inc_syscr(struct task_struct *tsk) | |
2952 | { | |
2953 | } | |
2954 | ||
2955 | static inline void inc_syscw(struct task_struct *tsk) | |
2956 | { | |
2957 | } | |
2958 | #endif | |
2959 | ||
82455257 DH |
2960 | #ifndef TASK_SIZE_OF |
2961 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2962 | #endif | |
2963 | ||
f98bafa0 | 2964 | #ifdef CONFIG_MEMCG |
cf475ad2 BS |
2965 | extern void mm_update_next_owner(struct mm_struct *mm); |
2966 | extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); | |
2967 | #else | |
2968 | static inline void mm_update_next_owner(struct mm_struct *mm) | |
2969 | { | |
2970 | } | |
2971 | ||
2972 | static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) | |
2973 | { | |
2974 | } | |
f98bafa0 | 2975 | #endif /* CONFIG_MEMCG */ |
cf475ad2 | 2976 | |
3e10e716 JS |
2977 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
2978 | unsigned int limit) | |
2979 | { | |
2980 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); | |
2981 | } | |
2982 | ||
2983 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, | |
2984 | unsigned int limit) | |
2985 | { | |
2986 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); | |
2987 | } | |
2988 | ||
2989 | static inline unsigned long rlimit(unsigned int limit) | |
2990 | { | |
2991 | return task_rlimit(current, limit); | |
2992 | } | |
2993 | ||
2994 | static inline unsigned long rlimit_max(unsigned int limit) | |
2995 | { | |
2996 | return task_rlimit_max(current, limit); | |
2997 | } | |
2998 | ||
1da177e4 | 2999 | #endif |