Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_SCHED_H |
2 | #define _LINUX_SCHED_H | |
3 | ||
b7b3c76a DW |
4 | /* |
5 | * cloning flags: | |
6 | */ | |
7 | #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ | |
8 | #define CLONE_VM 0x00000100 /* set if VM shared between processes */ | |
9 | #define CLONE_FS 0x00000200 /* set if fs info shared between processes */ | |
10 | #define CLONE_FILES 0x00000400 /* set if open files shared between processes */ | |
11 | #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ | |
12 | #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ | |
13 | #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ | |
14 | #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ | |
15 | #define CLONE_THREAD 0x00010000 /* Same thread group? */ | |
16 | #define CLONE_NEWNS 0x00020000 /* New namespace group? */ | |
17 | #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ | |
18 | #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ | |
19 | #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ | |
20 | #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ | |
21 | #define CLONE_DETACHED 0x00400000 /* Unused, ignored */ | |
22 | #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ | |
23 | #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ | |
24 | #define CLONE_STOPPED 0x02000000 /* Start in stopped state */ | |
071df104 | 25 | #define CLONE_NEWUTS 0x04000000 /* New utsname group? */ |
25b21cb2 | 26 | #define CLONE_NEWIPC 0x08000000 /* New ipcs */ |
77ec739d | 27 | #define CLONE_NEWUSER 0x10000000 /* New user namespace */ |
30e49c26 | 28 | #define CLONE_NEWPID 0x20000000 /* New pid namespace */ |
169e3674 | 29 | #define CLONE_NEWNET 0x40000000 /* New network namespace */ |
fadad878 | 30 | #define CLONE_IO 0x80000000 /* Clone io context */ |
b7b3c76a DW |
31 | |
32 | /* | |
33 | * Scheduling policies | |
34 | */ | |
35 | #define SCHED_NORMAL 0 | |
36 | #define SCHED_FIFO 1 | |
37 | #define SCHED_RR 2 | |
38 | #define SCHED_BATCH 3 | |
0e6aca43 IM |
39 | /* SCHED_ISO: reserved but not implemented yet */ |
40 | #define SCHED_IDLE 5 | |
ca94c442 LP |
41 | /* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */ |
42 | #define SCHED_RESET_ON_FORK 0x40000000 | |
b7b3c76a | 43 | |
a3b6714e | 44 | #ifdef __KERNEL__ |
b7b3c76a DW |
45 | |
46 | struct sched_param { | |
47 | int sched_priority; | |
48 | }; | |
49 | ||
1da177e4 LT |
50 | #include <asm/param.h> /* for HZ */ |
51 | ||
1da177e4 LT |
52 | #include <linux/capability.h> |
53 | #include <linux/threads.h> | |
54 | #include <linux/kernel.h> | |
55 | #include <linux/types.h> | |
56 | #include <linux/timex.h> | |
57 | #include <linux/jiffies.h> | |
58 | #include <linux/rbtree.h> | |
59 | #include <linux/thread_info.h> | |
60 | #include <linux/cpumask.h> | |
61 | #include <linux/errno.h> | |
62 | #include <linux/nodemask.h> | |
c92ff1bd | 63 | #include <linux/mm_types.h> |
1da177e4 LT |
64 | |
65 | #include <asm/system.h> | |
1da177e4 LT |
66 | #include <asm/page.h> |
67 | #include <asm/ptrace.h> | |
1da177e4 LT |
68 | #include <asm/cputime.h> |
69 | ||
70 | #include <linux/smp.h> | |
71 | #include <linux/sem.h> | |
72 | #include <linux/signal.h> | |
1da177e4 LT |
73 | #include <linux/compiler.h> |
74 | #include <linux/completion.h> | |
75 | #include <linux/pid.h> | |
76 | #include <linux/percpu.h> | |
77 | #include <linux/topology.h> | |
3e26c149 | 78 | #include <linux/proportions.h> |
1da177e4 | 79 | #include <linux/seccomp.h> |
e56d0903 | 80 | #include <linux/rcupdate.h> |
05725f7e | 81 | #include <linux/rculist.h> |
23f78d4a | 82 | #include <linux/rtmutex.h> |
1da177e4 | 83 | |
a3b6714e DW |
84 | #include <linux/time.h> |
85 | #include <linux/param.h> | |
86 | #include <linux/resource.h> | |
87 | #include <linux/timer.h> | |
88 | #include <linux/hrtimer.h> | |
7c3ab738 | 89 | #include <linux/task_io_accounting.h> |
9745512c | 90 | #include <linux/latencytop.h> |
9e2b2dc4 | 91 | #include <linux/cred.h> |
a3b6714e DW |
92 | |
93 | #include <asm/processor.h> | |
36d57ac4 | 94 | |
1da177e4 | 95 | struct exec_domain; |
c87e2837 | 96 | struct futex_pi_state; |
286100a6 | 97 | struct robust_list_head; |
bddd87c7 | 98 | struct bio_list; |
5ad4e53b | 99 | struct fs_struct; |
cdd6c482 | 100 | struct perf_event_context; |
1da177e4 | 101 | |
1da177e4 LT |
102 | /* |
103 | * List of flags we want to share for kernel threads, | |
104 | * if only because they are not used by them anyway. | |
105 | */ | |
106 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) | |
107 | ||
108 | /* | |
109 | * These are the constant used to fake the fixed-point load-average | |
110 | * counting. Some notes: | |
111 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
112 | * a load-average precision of 10 bits integer + 11 bits fractional | |
113 | * - if you want to count load-averages more often, you need more | |
114 | * precision, or rounding will get you. With 2-second counting freq, | |
115 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
116 | * 11 bit fractions. | |
117 | */ | |
118 | extern unsigned long avenrun[]; /* Load averages */ | |
2d02494f | 119 | extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); |
1da177e4 LT |
120 | |
121 | #define FSHIFT 11 /* nr of bits of precision */ | |
122 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 123 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
124 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
125 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
126 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
127 | ||
128 | #define CALC_LOAD(load,exp,n) \ | |
129 | load *= exp; \ | |
130 | load += n*(FIXED_1-exp); \ | |
131 | load >>= FSHIFT; | |
132 | ||
133 | extern unsigned long total_forks; | |
134 | extern int nr_threads; | |
1da177e4 LT |
135 | DECLARE_PER_CPU(unsigned long, process_counts); |
136 | extern int nr_processes(void); | |
137 | extern unsigned long nr_running(void); | |
138 | extern unsigned long nr_uninterruptible(void); | |
139 | extern unsigned long nr_iowait(void); | |
8c215bd3 | 140 | extern unsigned long nr_iowait_cpu(int cpu); |
69d25870 AV |
141 | extern unsigned long this_cpu_load(void); |
142 | ||
143 | ||
0f004f5a | 144 | extern void calc_global_load(unsigned long ticks); |
1da177e4 | 145 | |
7e49fcce SR |
146 | extern unsigned long get_parent_ip(unsigned long addr); |
147 | ||
43ae34cb IM |
148 | struct seq_file; |
149 | struct cfs_rq; | |
4cf86d77 | 150 | struct task_group; |
43ae34cb IM |
151 | #ifdef CONFIG_SCHED_DEBUG |
152 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
153 | extern void proc_sched_set_task(struct task_struct *p); | |
154 | extern void | |
5cef9eca | 155 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
43ae34cb IM |
156 | #else |
157 | static inline void | |
158 | proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
159 | { | |
160 | } | |
161 | static inline void proc_sched_set_task(struct task_struct *p) | |
162 | { | |
163 | } | |
164 | static inline void | |
5cef9eca | 165 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
43ae34cb IM |
166 | { |
167 | } | |
168 | #endif | |
1da177e4 | 169 | |
4a8342d2 LT |
170 | /* |
171 | * Task state bitmask. NOTE! These bits are also | |
172 | * encoded in fs/proc/array.c: get_task_state(). | |
173 | * | |
174 | * We have two separate sets of flags: task->state | |
175 | * is about runnability, while task->exit_state are | |
176 | * about the task exiting. Confusing, but this way | |
177 | * modifying one set can't modify the other one by | |
178 | * mistake. | |
179 | */ | |
1da177e4 LT |
180 | #define TASK_RUNNING 0 |
181 | #define TASK_INTERRUPTIBLE 1 | |
182 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
183 | #define __TASK_STOPPED 4 |
184 | #define __TASK_TRACED 8 | |
4a8342d2 LT |
185 | /* in tsk->exit_state */ |
186 | #define EXIT_ZOMBIE 16 | |
187 | #define EXIT_DEAD 32 | |
188 | /* in tsk->state again */ | |
af927232 | 189 | #define TASK_DEAD 64 |
f021a3c2 | 190 | #define TASK_WAKEKILL 128 |
e9c84311 | 191 | #define TASK_WAKING 256 |
e1781538 | 192 | #define TASK_STATE_MAX 512 |
f021a3c2 | 193 | |
44d90df6 | 194 | #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW" |
73342151 | 195 | |
e1781538 PZ |
196 | extern char ___assert_task_state[1 - 2*!!( |
197 | sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; | |
f021a3c2 MW |
198 | |
199 | /* Convenience macros for the sake of set_task_state */ | |
200 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
201 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
202 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 203 | |
92a1f4bc MW |
204 | /* Convenience macros for the sake of wake_up */ |
205 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 206 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
207 | |
208 | /* get_task_state() */ | |
209 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 MW |
210 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
211 | __TASK_TRACED) | |
92a1f4bc | 212 | |
f021a3c2 MW |
213 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
214 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
8f92054e | 215 | #define task_is_dead(task) ((task)->exit_state != 0) |
92a1f4bc | 216 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 217 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 218 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 219 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
6301cb95 | 220 | (task->flags & PF_FREEZING) == 0) |
1da177e4 LT |
221 | |
222 | #define __set_task_state(tsk, state_value) \ | |
223 | do { (tsk)->state = (state_value); } while (0) | |
224 | #define set_task_state(tsk, state_value) \ | |
225 | set_mb((tsk)->state, (state_value)) | |
226 | ||
498d0c57 AM |
227 | /* |
228 | * set_current_state() includes a barrier so that the write of current->state | |
229 | * is correctly serialised wrt the caller's subsequent test of whether to | |
230 | * actually sleep: | |
231 | * | |
232 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
233 | * if (do_i_need_to_sleep()) | |
234 | * schedule(); | |
235 | * | |
236 | * If the caller does not need such serialisation then use __set_current_state() | |
237 | */ | |
1da177e4 LT |
238 | #define __set_current_state(state_value) \ |
239 | do { current->state = (state_value); } while (0) | |
240 | #define set_current_state(state_value) \ | |
241 | set_mb(current->state, (state_value)) | |
242 | ||
243 | /* Task command name length */ | |
244 | #define TASK_COMM_LEN 16 | |
245 | ||
1da177e4 LT |
246 | #include <linux/spinlock.h> |
247 | ||
248 | /* | |
249 | * This serializes "schedule()" and also protects | |
250 | * the run-queue from deletions/modifications (but | |
251 | * _adding_ to the beginning of the run-queue has | |
252 | * a separate lock). | |
253 | */ | |
254 | extern rwlock_t tasklist_lock; | |
255 | extern spinlock_t mmlist_lock; | |
256 | ||
36c8b586 | 257 | struct task_struct; |
1da177e4 | 258 | |
db1466b3 PM |
259 | #ifdef CONFIG_PROVE_RCU |
260 | extern int lockdep_tasklist_lock_is_held(void); | |
261 | #endif /* #ifdef CONFIG_PROVE_RCU */ | |
262 | ||
1da177e4 LT |
263 | extern void sched_init(void); |
264 | extern void sched_init_smp(void); | |
2d07b255 | 265 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
36c8b586 | 266 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 267 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 | 268 | |
89f19f04 | 269 | extern int runqueue_is_locked(int cpu); |
017730c1 | 270 | |
6a7b3dc3 | 271 | extern cpumask_var_t nohz_cpu_mask; |
46cb4b7c | 272 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) |
83cd4fe2 VP |
273 | extern void select_nohz_load_balancer(int stop_tick); |
274 | extern int get_nohz_timer_target(void); | |
46cb4b7c | 275 | #else |
83cd4fe2 | 276 | static inline void select_nohz_load_balancer(int stop_tick) { } |
46cb4b7c | 277 | #endif |
1da177e4 | 278 | |
e59e2ae2 | 279 | /* |
39bc89fd | 280 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
281 | */ |
282 | extern void show_state_filter(unsigned long state_filter); | |
283 | ||
284 | static inline void show_state(void) | |
285 | { | |
39bc89fd | 286 | show_state_filter(0); |
e59e2ae2 IM |
287 | } |
288 | ||
1da177e4 LT |
289 | extern void show_regs(struct pt_regs *); |
290 | ||
291 | /* | |
292 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
293 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
294 | * trace (or NULL if the entire call-chain of the task should be shown). | |
295 | */ | |
296 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
297 | ||
298 | void io_schedule(void); | |
299 | long io_schedule_timeout(long timeout); | |
300 | ||
301 | extern void cpu_init (void); | |
302 | extern void trap_init(void); | |
303 | extern void update_process_times(int user); | |
304 | extern void scheduler_tick(void); | |
305 | ||
82a1fcb9 IM |
306 | extern void sched_show_task(struct task_struct *p); |
307 | ||
19cc36c0 | 308 | #ifdef CONFIG_LOCKUP_DETECTOR |
8446f1d3 | 309 | extern void touch_softlockup_watchdog(void); |
d6ad3e28 | 310 | extern void touch_softlockup_watchdog_sync(void); |
04c9167f | 311 | extern void touch_all_softlockup_watchdogs(void); |
332fbdbc DZ |
312 | extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, |
313 | void __user *buffer, | |
314 | size_t *lenp, loff_t *ppos); | |
9c44bc03 | 315 | extern unsigned int softlockup_panic; |
9383d967 | 316 | extern int softlockup_thresh; |
004417a6 | 317 | void lockup_detector_init(void); |
8446f1d3 | 318 | #else |
8446f1d3 IM |
319 | static inline void touch_softlockup_watchdog(void) |
320 | { | |
321 | } | |
d6ad3e28 JW |
322 | static inline void touch_softlockup_watchdog_sync(void) |
323 | { | |
324 | } | |
04c9167f JF |
325 | static inline void touch_all_softlockup_watchdogs(void) |
326 | { | |
327 | } | |
004417a6 PZ |
328 | static inline void lockup_detector_init(void) |
329 | { | |
330 | } | |
8446f1d3 IM |
331 | #endif |
332 | ||
e162b39a MSB |
333 | #ifdef CONFIG_DETECT_HUNG_TASK |
334 | extern unsigned int sysctl_hung_task_panic; | |
335 | extern unsigned long sysctl_hung_task_check_count; | |
336 | extern unsigned long sysctl_hung_task_timeout_secs; | |
337 | extern unsigned long sysctl_hung_task_warnings; | |
338 | extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, | |
8d65af78 | 339 | void __user *buffer, |
e162b39a | 340 | size_t *lenp, loff_t *ppos); |
e4ecda1b ML |
341 | #else |
342 | /* Avoid need for ifdefs elsewhere in the code */ | |
343 | enum { sysctl_hung_task_timeout_secs = 0 }; | |
e162b39a | 344 | #endif |
8446f1d3 | 345 | |
1da177e4 LT |
346 | /* Attach to any functions which should be ignored in wchan output. */ |
347 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
348 | |
349 | /* Linker adds these: start and end of __sched functions */ | |
350 | extern char __sched_text_start[], __sched_text_end[]; | |
351 | ||
1da177e4 LT |
352 | /* Is this address in the __sched functions? */ |
353 | extern int in_sched_functions(unsigned long addr); | |
354 | ||
355 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
b3c97528 | 356 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 357 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 358 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 359 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
1da177e4 | 360 | asmlinkage void schedule(void); |
0d66bf6d | 361 | extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner); |
1da177e4 | 362 | |
ab516013 | 363 | struct nsproxy; |
acce292c | 364 | struct user_namespace; |
1da177e4 | 365 | |
341c87bf KH |
366 | /* |
367 | * Default maximum number of active map areas, this limits the number of vmas | |
368 | * per mm struct. Users can overwrite this number by sysctl but there is a | |
369 | * problem. | |
370 | * | |
371 | * When a program's coredump is generated as ELF format, a section is created | |
372 | * per a vma. In ELF, the number of sections is represented in unsigned short. | |
373 | * This means the number of sections should be smaller than 65535 at coredump. | |
374 | * Because the kernel adds some informative sections to a image of program at | |
375 | * generating coredump, we need some margin. The number of extra sections is | |
376 | * 1-3 now and depends on arch. We use "5" as safe margin, here. | |
377 | */ | |
378 | #define MAPCOUNT_ELF_CORE_MARGIN (5) | |
4be929be | 379 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) |
1da177e4 LT |
380 | |
381 | extern int sysctl_max_map_count; | |
382 | ||
383 | #include <linux/aio.h> | |
384 | ||
efc1a3b1 DH |
385 | #ifdef CONFIG_MMU |
386 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1da177e4 LT |
387 | extern unsigned long |
388 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
389 | unsigned long, unsigned long); | |
390 | extern unsigned long | |
391 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
392 | unsigned long len, unsigned long pgoff, | |
393 | unsigned long flags); | |
1363c3cd WW |
394 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
395 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); | |
efc1a3b1 DH |
396 | #else |
397 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} | |
398 | #endif | |
1da177e4 | 399 | |
901608d9 | 400 | |
6c5d5238 KH |
401 | extern void set_dumpable(struct mm_struct *mm, int value); |
402 | extern int get_dumpable(struct mm_struct *mm); | |
403 | ||
404 | /* mm flags */ | |
3cb4a0bb | 405 | /* dumpable bits */ |
6c5d5238 KH |
406 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
407 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ | |
f8af4da3 | 408 | |
3cb4a0bb | 409 | #define MMF_DUMPABLE_BITS 2 |
f8af4da3 | 410 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
3cb4a0bb KH |
411 | |
412 | /* coredump filter bits */ | |
413 | #define MMF_DUMP_ANON_PRIVATE 2 | |
414 | #define MMF_DUMP_ANON_SHARED 3 | |
415 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
416 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 417 | #define MMF_DUMP_ELF_HEADERS 6 |
e575f111 KM |
418 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
419 | #define MMF_DUMP_HUGETLB_SHARED 8 | |
f8af4da3 | 420 | |
3cb4a0bb | 421 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
e575f111 | 422 | #define MMF_DUMP_FILTER_BITS 7 |
3cb4a0bb KH |
423 | #define MMF_DUMP_FILTER_MASK \ |
424 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
425 | #define MMF_DUMP_FILTER_DEFAULT \ | |
e575f111 | 426 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
656eb2cd RM |
427 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
428 | ||
429 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS | |
430 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) | |
431 | #else | |
432 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 | |
433 | #endif | |
f8af4da3 HD |
434 | /* leave room for more dump flags */ |
435 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ | |
436 | ||
437 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) | |
6c5d5238 | 438 | |
1da177e4 LT |
439 | struct sighand_struct { |
440 | atomic_t count; | |
441 | struct k_sigaction action[_NSIG]; | |
442 | spinlock_t siglock; | |
b8fceee1 | 443 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
444 | }; |
445 | ||
0e464814 | 446 | struct pacct_struct { |
f6ec29a4 KK |
447 | int ac_flag; |
448 | long ac_exitcode; | |
0e464814 | 449 | unsigned long ac_mem; |
77787bfb KK |
450 | cputime_t ac_utime, ac_stime; |
451 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
452 | }; |
453 | ||
42c4ab41 SG |
454 | struct cpu_itimer { |
455 | cputime_t expires; | |
456 | cputime_t incr; | |
8356b5f9 SG |
457 | u32 error; |
458 | u32 incr_error; | |
42c4ab41 SG |
459 | }; |
460 | ||
f06febc9 FM |
461 | /** |
462 | * struct task_cputime - collected CPU time counts | |
463 | * @utime: time spent in user mode, in &cputime_t units | |
464 | * @stime: time spent in kernel mode, in &cputime_t units | |
465 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds | |
5ce73a4a | 466 | * |
f06febc9 FM |
467 | * This structure groups together three kinds of CPU time that are |
468 | * tracked for threads and thread groups. Most things considering | |
469 | * CPU time want to group these counts together and treat all three | |
470 | * of them in parallel. | |
471 | */ | |
472 | struct task_cputime { | |
473 | cputime_t utime; | |
474 | cputime_t stime; | |
475 | unsigned long long sum_exec_runtime; | |
476 | }; | |
477 | /* Alternate field names when used to cache expirations. */ | |
478 | #define prof_exp stime | |
479 | #define virt_exp utime | |
480 | #define sched_exp sum_exec_runtime | |
481 | ||
4cd4c1b4 PZ |
482 | #define INIT_CPUTIME \ |
483 | (struct task_cputime) { \ | |
484 | .utime = cputime_zero, \ | |
485 | .stime = cputime_zero, \ | |
486 | .sum_exec_runtime = 0, \ | |
487 | } | |
488 | ||
c99e6efe PZ |
489 | /* |
490 | * Disable preemption until the scheduler is running. | |
491 | * Reset by start_kernel()->sched_init()->init_idle(). | |
d86ee480 PZ |
492 | * |
493 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working | |
494 | * before the scheduler is active -- see should_resched(). | |
c99e6efe | 495 | */ |
d86ee480 | 496 | #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) |
c99e6efe | 497 | |
f06febc9 | 498 | /** |
4cd4c1b4 PZ |
499 | * struct thread_group_cputimer - thread group interval timer counts |
500 | * @cputime: thread group interval timers. | |
501 | * @running: non-zero when there are timers running and | |
502 | * @cputime receives updates. | |
503 | * @lock: lock for fields in this struct. | |
f06febc9 FM |
504 | * |
505 | * This structure contains the version of task_cputime, above, that is | |
4cd4c1b4 | 506 | * used for thread group CPU timer calculations. |
f06febc9 | 507 | */ |
4cd4c1b4 PZ |
508 | struct thread_group_cputimer { |
509 | struct task_cputime cputime; | |
510 | int running; | |
511 | spinlock_t lock; | |
f06febc9 | 512 | }; |
f06febc9 | 513 | |
5091faa4 MG |
514 | struct autogroup; |
515 | ||
1da177e4 LT |
516 | /* |
517 | * NOTE! "signal_struct" does not have it's own | |
518 | * locking, because a shared signal_struct always | |
519 | * implies a shared sighand_struct, so locking | |
520 | * sighand_struct is always a proper superset of | |
521 | * the locking of signal_struct. | |
522 | */ | |
523 | struct signal_struct { | |
ea6d290c | 524 | atomic_t sigcnt; |
1da177e4 | 525 | atomic_t live; |
b3ac022c | 526 | int nr_threads; |
1da177e4 LT |
527 | |
528 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
529 | ||
530 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 531 | struct task_struct *curr_target; |
1da177e4 LT |
532 | |
533 | /* shared signal handling: */ | |
534 | struct sigpending shared_pending; | |
535 | ||
536 | /* thread group exit support */ | |
537 | int group_exit_code; | |
538 | /* overloaded: | |
539 | * - notify group_exit_task when ->count is equal to notify_count | |
540 | * - everyone except group_exit_task is stopped during signal delivery | |
541 | * of fatal signals, group_exit_task processes the signal. | |
542 | */ | |
1da177e4 | 543 | int notify_count; |
07dd20e0 | 544 | struct task_struct *group_exit_task; |
1da177e4 LT |
545 | |
546 | /* thread group stop support, overloads group_exit_code too */ | |
547 | int group_stop_count; | |
548 | unsigned int flags; /* see SIGNAL_* flags below */ | |
549 | ||
550 | /* POSIX.1b Interval Timers */ | |
551 | struct list_head posix_timers; | |
552 | ||
553 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 554 | struct hrtimer real_timer; |
fea9d175 | 555 | struct pid *leader_pid; |
2ff678b8 | 556 | ktime_t it_real_incr; |
1da177e4 | 557 | |
42c4ab41 SG |
558 | /* |
559 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use | |
560 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these | |
561 | * values are defined to 0 and 1 respectively | |
562 | */ | |
563 | struct cpu_itimer it[2]; | |
1da177e4 | 564 | |
f06febc9 | 565 | /* |
4cd4c1b4 PZ |
566 | * Thread group totals for process CPU timers. |
567 | * See thread_group_cputimer(), et al, for details. | |
f06febc9 | 568 | */ |
4cd4c1b4 | 569 | struct thread_group_cputimer cputimer; |
f06febc9 FM |
570 | |
571 | /* Earliest-expiration cache. */ | |
572 | struct task_cputime cputime_expires; | |
573 | ||
574 | struct list_head cpu_timers[3]; | |
575 | ||
ab521dc0 | 576 | struct pid *tty_old_pgrp; |
1ec320af | 577 | |
1da177e4 LT |
578 | /* boolean value for session group leader */ |
579 | int leader; | |
580 | ||
581 | struct tty_struct *tty; /* NULL if no tty */ | |
582 | ||
5091faa4 MG |
583 | #ifdef CONFIG_SCHED_AUTOGROUP |
584 | struct autogroup *autogroup; | |
585 | #endif | |
1da177e4 LT |
586 | /* |
587 | * Cumulative resource counters for dead threads in the group, | |
588 | * and for reaped dead child processes forked by this group. | |
589 | * Live threads maintain their own counters and add to these | |
590 | * in __exit_signal, except for the group leader. | |
591 | */ | |
32bd671d | 592 | cputime_t utime, stime, cutime, cstime; |
9ac52315 LV |
593 | cputime_t gtime; |
594 | cputime_t cgtime; | |
0cf55e1e HS |
595 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
596 | cputime_t prev_utime, prev_stime; | |
597 | #endif | |
1da177e4 LT |
598 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
599 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 600 | unsigned long inblock, oublock, cinblock, coublock; |
1f10206c | 601 | unsigned long maxrss, cmaxrss; |
940389b8 | 602 | struct task_io_accounting ioac; |
1da177e4 | 603 | |
32bd671d PZ |
604 | /* |
605 | * Cumulative ns of schedule CPU time fo dead threads in the | |
606 | * group, not including a zombie group leader, (This only differs | |
607 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
608 | * other than jiffies.) | |
609 | */ | |
610 | unsigned long long sum_sched_runtime; | |
611 | ||
1da177e4 LT |
612 | /* |
613 | * We don't bother to synchronize most readers of this at all, | |
614 | * because there is no reader checking a limit that actually needs | |
615 | * to get both rlim_cur and rlim_max atomically, and either one | |
616 | * alone is a single word that can safely be read normally. | |
617 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
618 | * protect this instead of the siglock, because they really | |
619 | * have no need to disable irqs. | |
620 | */ | |
621 | struct rlimit rlim[RLIM_NLIMITS]; | |
622 | ||
0e464814 KK |
623 | #ifdef CONFIG_BSD_PROCESS_ACCT |
624 | struct pacct_struct pacct; /* per-process accounting information */ | |
625 | #endif | |
ad4ecbcb | 626 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
627 | struct taskstats *stats; |
628 | #endif | |
522ed776 MT |
629 | #ifdef CONFIG_AUDIT |
630 | unsigned audit_tty; | |
631 | struct tty_audit_buf *tty_audit_buf; | |
632 | #endif | |
28b83c51 | 633 | |
a63d83f4 DR |
634 | int oom_adj; /* OOM kill score adjustment (bit shift) */ |
635 | int oom_score_adj; /* OOM kill score adjustment */ | |
9b1bf12d KM |
636 | |
637 | struct mutex cred_guard_mutex; /* guard against foreign influences on | |
638 | * credential calculations | |
639 | * (notably. ptrace) */ | |
1da177e4 LT |
640 | }; |
641 | ||
4866cde0 NP |
642 | /* Context switch must be unlocked if interrupts are to be enabled */ |
643 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW | |
644 | # define __ARCH_WANT_UNLOCKED_CTXSW | |
645 | #endif | |
646 | ||
1da177e4 LT |
647 | /* |
648 | * Bits in flags field of signal_struct. | |
649 | */ | |
650 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
651 | #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ | |
652 | #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ | |
653 | #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ | |
e4420551 ON |
654 | /* |
655 | * Pending notifications to parent. | |
656 | */ | |
657 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
658 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
659 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
1da177e4 | 660 | |
fae5fa44 ON |
661 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
662 | ||
ed5d2cac ON |
663 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
664 | static inline int signal_group_exit(const struct signal_struct *sig) | |
665 | { | |
666 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
667 | (sig->group_exit_task != NULL); | |
668 | } | |
669 | ||
1da177e4 LT |
670 | /* |
671 | * Some day this will be a full-fledged user tracking system.. | |
672 | */ | |
673 | struct user_struct { | |
674 | atomic_t __count; /* reference count */ | |
675 | atomic_t processes; /* How many processes does this user have? */ | |
676 | atomic_t files; /* How many open files does this user have? */ | |
677 | atomic_t sigpending; /* How many pending signals does this user have? */ | |
2d9048e2 | 678 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
679 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
680 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
681 | #endif | |
4afeff85 EP |
682 | #ifdef CONFIG_FANOTIFY |
683 | atomic_t fanotify_listeners; | |
684 | #endif | |
7ef9964e | 685 | #ifdef CONFIG_EPOLL |
52bd19f7 | 686 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
7ef9964e | 687 | #endif |
970a8645 | 688 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
689 | /* protected by mq_lock */ |
690 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 691 | #endif |
1da177e4 LT |
692 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
693 | ||
694 | #ifdef CONFIG_KEYS | |
695 | struct key *uid_keyring; /* UID specific keyring */ | |
696 | struct key *session_keyring; /* UID's default session keyring */ | |
697 | #endif | |
698 | ||
699 | /* Hash table maintenance information */ | |
735de223 | 700 | struct hlist_node uidhash_node; |
1da177e4 | 701 | uid_t uid; |
18b6e041 | 702 | struct user_namespace *user_ns; |
24e377a8 | 703 | |
cdd6c482 | 704 | #ifdef CONFIG_PERF_EVENTS |
789f90fc PZ |
705 | atomic_long_t locked_vm; |
706 | #endif | |
1da177e4 LT |
707 | }; |
708 | ||
eb41d946 | 709 | extern int uids_sysfs_init(void); |
5cb350ba | 710 | |
1da177e4 LT |
711 | extern struct user_struct *find_user(uid_t); |
712 | ||
713 | extern struct user_struct root_user; | |
714 | #define INIT_USER (&root_user) | |
715 | ||
b6dff3ec | 716 | |
1da177e4 LT |
717 | struct backing_dev_info; |
718 | struct reclaim_state; | |
719 | ||
52f17b6c | 720 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
721 | struct sched_info { |
722 | /* cumulative counters */ | |
2d72376b | 723 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 724 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
725 | |
726 | /* timestamps */ | |
172ba844 BS |
727 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
728 | last_queued; /* when we were last queued to run */ | |
b8efb561 IM |
729 | #ifdef CONFIG_SCHEDSTATS |
730 | /* BKL stats */ | |
480b9434 | 731 | unsigned int bkl_count; |
b8efb561 | 732 | #endif |
1da177e4 | 733 | }; |
52f17b6c | 734 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 735 | |
ca74e92b SN |
736 | #ifdef CONFIG_TASK_DELAY_ACCT |
737 | struct task_delay_info { | |
738 | spinlock_t lock; | |
739 | unsigned int flags; /* Private per-task flags */ | |
740 | ||
741 | /* For each stat XXX, add following, aligned appropriately | |
742 | * | |
743 | * struct timespec XXX_start, XXX_end; | |
744 | * u64 XXX_delay; | |
745 | * u32 XXX_count; | |
746 | * | |
747 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
748 | * single lock above (split into XXX_lock if contention is an issue). | |
749 | */ | |
0ff92245 SN |
750 | |
751 | /* | |
752 | * XXX_count is incremented on every XXX operation, the delay | |
753 | * associated with the operation is added to XXX_delay. | |
754 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
755 | */ | |
756 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ | |
757 | u64 blkio_delay; /* wait for sync block io completion */ | |
758 | u64 swapin_delay; /* wait for swapin block io completion */ | |
759 | u32 blkio_count; /* total count of the number of sync block */ | |
760 | /* io operations performed */ | |
761 | u32 swapin_count; /* total count of the number of swapin block */ | |
762 | /* io operations performed */ | |
873b4771 KK |
763 | |
764 | struct timespec freepages_start, freepages_end; | |
765 | u64 freepages_delay; /* wait for memory reclaim */ | |
766 | u32 freepages_count; /* total count of memory reclaim */ | |
ca74e92b | 767 | }; |
52f17b6c CS |
768 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
769 | ||
770 | static inline int sched_info_on(void) | |
771 | { | |
772 | #ifdef CONFIG_SCHEDSTATS | |
773 | return 1; | |
774 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
775 | extern int delayacct_on; | |
776 | return delayacct_on; | |
777 | #else | |
778 | return 0; | |
ca74e92b | 779 | #endif |
52f17b6c | 780 | } |
ca74e92b | 781 | |
d15bcfdb IM |
782 | enum cpu_idle_type { |
783 | CPU_IDLE, | |
784 | CPU_NOT_IDLE, | |
785 | CPU_NEWLY_IDLE, | |
786 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
787 | }; |
788 | ||
789 | /* | |
790 | * sched-domains (multiprocessor balancing) declarations: | |
791 | */ | |
9aa7b369 IM |
792 | |
793 | /* | |
794 | * Increase resolution of nice-level calculations: | |
795 | */ | |
796 | #define SCHED_LOAD_SHIFT 10 | |
797 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) | |
798 | ||
f8700df7 | 799 | #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE |
1da177e4 | 800 | |
2dd73a4f | 801 | #ifdef CONFIG_SMP |
b5d978e0 PZ |
802 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
803 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ | |
804 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ | |
805 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ | |
c88d5910 | 806 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
b5d978e0 | 807 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
59abf026 | 808 | #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */ |
b5d978e0 PZ |
809 | #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ |
810 | #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */ | |
811 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ | |
812 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ | |
532cb4c4 | 813 | #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ |
b5d978e0 | 814 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
5c45bf27 | 815 | |
afb8a9b7 GS |
816 | enum powersavings_balance_level { |
817 | POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ | |
818 | POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package | |
819 | * first for long running threads | |
820 | */ | |
821 | POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle | |
822 | * cpu package for power savings | |
823 | */ | |
824 | MAX_POWERSAVINGS_BALANCE_LEVELS | |
825 | }; | |
89c4710e | 826 | |
716707b2 | 827 | extern int sched_mc_power_savings, sched_smt_power_savings; |
89c4710e | 828 | |
716707b2 VS |
829 | static inline int sd_balance_for_mc_power(void) |
830 | { | |
831 | if (sched_smt_power_savings) | |
832 | return SD_POWERSAVINGS_BALANCE; | |
5c45bf27 | 833 | |
28f53181 VS |
834 | if (!sched_mc_power_savings) |
835 | return SD_PREFER_SIBLING; | |
836 | ||
837 | return 0; | |
716707b2 | 838 | } |
89c4710e | 839 | |
716707b2 VS |
840 | static inline int sd_balance_for_package_power(void) |
841 | { | |
842 | if (sched_mc_power_savings | sched_smt_power_savings) | |
843 | return SD_POWERSAVINGS_BALANCE; | |
844 | ||
b5d978e0 | 845 | return SD_PREFER_SIBLING; |
716707b2 | 846 | } |
5c45bf27 | 847 | |
532cb4c4 MN |
848 | extern int __weak arch_sd_sibiling_asym_packing(void); |
849 | ||
100fdaee VS |
850 | /* |
851 | * Optimise SD flags for power savings: | |
852 | * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings. | |
853 | * Keep default SD flags if sched_{smt,mc}_power_saving=0 | |
854 | */ | |
855 | ||
856 | static inline int sd_power_saving_flags(void) | |
857 | { | |
858 | if (sched_mc_power_savings | sched_smt_power_savings) | |
859 | return SD_BALANCE_NEWIDLE; | |
860 | ||
861 | return 0; | |
862 | } | |
1da177e4 LT |
863 | |
864 | struct sched_group { | |
865 | struct sched_group *next; /* Must be a circular list */ | |
1da177e4 LT |
866 | |
867 | /* | |
868 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a | |
18a3885f | 869 | * single CPU. |
5517d86b | 870 | */ |
9d5efe05 | 871 | unsigned int cpu_power, cpu_power_orig; |
aae6d3dd | 872 | unsigned int group_weight; |
6c99e9ad | 873 | |
4200efd9 IM |
874 | /* |
875 | * The CPUs this group covers. | |
876 | * | |
877 | * NOTE: this field is variable length. (Allocated dynamically | |
878 | * by attaching extra space to the end of the structure, | |
879 | * depending on how many CPUs the kernel has booted up with) | |
880 | * | |
881 | * It is also be embedded into static data structures at build | |
882 | * time. (See 'struct static_sched_group' in kernel/sched.c) | |
883 | */ | |
884 | unsigned long cpumask[0]; | |
1da177e4 LT |
885 | }; |
886 | ||
758b2cdc RR |
887 | static inline struct cpumask *sched_group_cpus(struct sched_group *sg) |
888 | { | |
6c99e9ad | 889 | return to_cpumask(sg->cpumask); |
758b2cdc RR |
890 | } |
891 | ||
1d3504fc HS |
892 | enum sched_domain_level { |
893 | SD_LV_NONE = 0, | |
894 | SD_LV_SIBLING, | |
895 | SD_LV_MC, | |
01a08546 | 896 | SD_LV_BOOK, |
1d3504fc HS |
897 | SD_LV_CPU, |
898 | SD_LV_NODE, | |
899 | SD_LV_ALLNODES, | |
900 | SD_LV_MAX | |
901 | }; | |
902 | ||
903 | struct sched_domain_attr { | |
904 | int relax_domain_level; | |
905 | }; | |
906 | ||
907 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ | |
908 | .relax_domain_level = -1, \ | |
909 | } | |
910 | ||
1da177e4 LT |
911 | struct sched_domain { |
912 | /* These fields must be setup */ | |
913 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 914 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 | 915 | struct sched_group *groups; /* the balancing groups of the domain */ |
1da177e4 LT |
916 | unsigned long min_interval; /* Minimum balance interval ms */ |
917 | unsigned long max_interval; /* Maximum balance interval ms */ | |
918 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
919 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 920 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
921 | unsigned int busy_idx; |
922 | unsigned int idle_idx; | |
923 | unsigned int newidle_idx; | |
924 | unsigned int wake_idx; | |
147cbb4b | 925 | unsigned int forkexec_idx; |
a52bfd73 | 926 | unsigned int smt_gain; |
1da177e4 | 927 | int flags; /* See SD_* */ |
1d3504fc | 928 | enum sched_domain_level level; |
1da177e4 LT |
929 | |
930 | /* Runtime fields. */ | |
931 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
932 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
933 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
934 | ||
2398f2c6 PZ |
935 | u64 last_update; |
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 | |
6c99e9ad | 971 | |
669c55e9 | 972 | unsigned int span_weight; |
4200efd9 IM |
973 | /* |
974 | * Span of all CPUs in this domain. | |
975 | * | |
976 | * NOTE: this field is variable length. (Allocated dynamically | |
977 | * by attaching extra space to the end of the structure, | |
978 | * depending on how many CPUs the kernel has booted up with) | |
979 | * | |
980 | * It is also be embedded into static data structures at build | |
981 | * time. (See 'struct static_sched_domain' in kernel/sched.c) | |
982 | */ | |
983 | unsigned long span[0]; | |
1da177e4 LT |
984 | }; |
985 | ||
758b2cdc RR |
986 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
987 | { | |
6c99e9ad | 988 | return to_cpumask(sd->span); |
758b2cdc RR |
989 | } |
990 | ||
acc3f5d7 | 991 | extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1d3504fc | 992 | struct sched_domain_attr *dattr_new); |
029190c5 | 993 | |
acc3f5d7 RR |
994 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
995 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); | |
996 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); | |
997 | ||
06aaf76a IM |
998 | /* Test a flag in parent sched domain */ |
999 | static inline int test_sd_parent(struct sched_domain *sd, int flag) | |
1000 | { | |
1001 | if (sd->parent && (sd->parent->flags & flag)) | |
1002 | return 1; | |
1003 | ||
1004 | return 0; | |
1005 | } | |
029190c5 | 1006 | |
47fe38fc PZ |
1007 | unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); |
1008 | unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); | |
1009 | ||
1b427c15 | 1010 | #else /* CONFIG_SMP */ |
1da177e4 | 1011 | |
1b427c15 | 1012 | struct sched_domain_attr; |
d02c7a8c | 1013 | |
1b427c15 | 1014 | static inline void |
acc3f5d7 | 1015 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1b427c15 IM |
1016 | struct sched_domain_attr *dattr_new) |
1017 | { | |
d02c7a8c | 1018 | } |
1b427c15 | 1019 | #endif /* !CONFIG_SMP */ |
1da177e4 | 1020 | |
47fe38fc | 1021 | |
1da177e4 | 1022 | struct io_context; /* See blkdev.h */ |
1da177e4 | 1023 | |
1da177e4 | 1024 | |
383f2835 | 1025 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 1026 | extern void prefetch_stack(struct task_struct *t); |
383f2835 CK |
1027 | #else |
1028 | static inline void prefetch_stack(struct task_struct *t) { } | |
1029 | #endif | |
1da177e4 LT |
1030 | |
1031 | struct audit_context; /* See audit.c */ | |
1032 | struct mempolicy; | |
b92ce558 | 1033 | struct pipe_inode_info; |
4865ecf1 | 1034 | struct uts_namespace; |
1da177e4 | 1035 | |
20b8a59f IM |
1036 | struct rq; |
1037 | struct sched_domain; | |
1038 | ||
7d478721 PZ |
1039 | /* |
1040 | * wake flags | |
1041 | */ | |
1042 | #define WF_SYNC 0x01 /* waker goes to sleep after wakup */ | |
a7558e01 | 1043 | #define WF_FORK 0x02 /* child wakeup after fork */ |
7d478721 | 1044 | |
371fd7e7 PZ |
1045 | #define ENQUEUE_WAKEUP 1 |
1046 | #define ENQUEUE_WAKING 2 | |
1047 | #define ENQUEUE_HEAD 4 | |
1048 | ||
1049 | #define DEQUEUE_SLEEP 1 | |
1050 | ||
20b8a59f | 1051 | struct sched_class { |
5522d5d5 | 1052 | const struct sched_class *next; |
20b8a59f | 1053 | |
371fd7e7 PZ |
1054 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); |
1055 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); | |
4530d7ab | 1056 | void (*yield_task) (struct rq *rq); |
20b8a59f | 1057 | |
7d478721 | 1058 | void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); |
20b8a59f | 1059 | |
fb8d4724 | 1060 | struct task_struct * (*pick_next_task) (struct rq *rq); |
31ee529c | 1061 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
20b8a59f | 1062 | |
681f3e68 | 1063 | #ifdef CONFIG_SMP |
0017d735 PZ |
1064 | int (*select_task_rq)(struct rq *rq, struct task_struct *p, |
1065 | int sd_flag, int flags); | |
4ce72a2c | 1066 | |
9a897c5a SR |
1067 | void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); |
1068 | void (*post_schedule) (struct rq *this_rq); | |
efbbd05a PZ |
1069 | void (*task_waking) (struct rq *this_rq, struct task_struct *task); |
1070 | void (*task_woken) (struct rq *this_rq, struct task_struct *task); | |
e1d1484f | 1071 | |
cd8ba7cd | 1072 | void (*set_cpus_allowed)(struct task_struct *p, |
96f874e2 | 1073 | const struct cpumask *newmask); |
57d885fe | 1074 | |
1f11eb6a GH |
1075 | void (*rq_online)(struct rq *rq); |
1076 | void (*rq_offline)(struct rq *rq); | |
4ce72a2c LZ |
1077 | #endif |
1078 | ||
1079 | void (*set_curr_task) (struct rq *rq); | |
1080 | void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); | |
cd29fe6f | 1081 | void (*task_fork) (struct task_struct *p); |
cb469845 SR |
1082 | |
1083 | void (*switched_from) (struct rq *this_rq, struct task_struct *task, | |
1084 | int running); | |
1085 | void (*switched_to) (struct rq *this_rq, struct task_struct *task, | |
1086 | int running); | |
1087 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, | |
1088 | int oldprio, int running); | |
810b3817 | 1089 | |
dba091b9 TG |
1090 | unsigned int (*get_rr_interval) (struct rq *rq, |
1091 | struct task_struct *task); | |
0d721cea | 1092 | |
810b3817 | 1093 | #ifdef CONFIG_FAIR_GROUP_SCHED |
b2b5ce02 | 1094 | void (*task_move_group) (struct task_struct *p, int on_rq); |
810b3817 | 1095 | #endif |
20b8a59f IM |
1096 | }; |
1097 | ||
1098 | struct load_weight { | |
1099 | unsigned long weight, inv_weight; | |
1100 | }; | |
1101 | ||
94c18227 | 1102 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 1103 | struct sched_statistics { |
20b8a59f | 1104 | u64 wait_start; |
94c18227 | 1105 | u64 wait_max; |
6d082592 AV |
1106 | u64 wait_count; |
1107 | u64 wait_sum; | |
8f0dfc34 AV |
1108 | u64 iowait_count; |
1109 | u64 iowait_sum; | |
94c18227 | 1110 | |
20b8a59f | 1111 | u64 sleep_start; |
20b8a59f | 1112 | u64 sleep_max; |
94c18227 IM |
1113 | s64 sum_sleep_runtime; |
1114 | ||
1115 | u64 block_start; | |
20b8a59f IM |
1116 | u64 block_max; |
1117 | u64 exec_max; | |
eba1ed4b | 1118 | u64 slice_max; |
cc367732 | 1119 | |
cc367732 IM |
1120 | u64 nr_migrations_cold; |
1121 | u64 nr_failed_migrations_affine; | |
1122 | u64 nr_failed_migrations_running; | |
1123 | u64 nr_failed_migrations_hot; | |
1124 | u64 nr_forced_migrations; | |
cc367732 IM |
1125 | |
1126 | u64 nr_wakeups; | |
1127 | u64 nr_wakeups_sync; | |
1128 | u64 nr_wakeups_migrate; | |
1129 | u64 nr_wakeups_local; | |
1130 | u64 nr_wakeups_remote; | |
1131 | u64 nr_wakeups_affine; | |
1132 | u64 nr_wakeups_affine_attempts; | |
1133 | u64 nr_wakeups_passive; | |
1134 | u64 nr_wakeups_idle; | |
41acab88 LDM |
1135 | }; |
1136 | #endif | |
1137 | ||
1138 | struct sched_entity { | |
1139 | struct load_weight load; /* for load-balancing */ | |
1140 | struct rb_node run_node; | |
1141 | struct list_head group_node; | |
1142 | unsigned int on_rq; | |
1143 | ||
1144 | u64 exec_start; | |
1145 | u64 sum_exec_runtime; | |
1146 | u64 vruntime; | |
1147 | u64 prev_sum_exec_runtime; | |
1148 | ||
41acab88 LDM |
1149 | u64 nr_migrations; |
1150 | ||
41acab88 LDM |
1151 | #ifdef CONFIG_SCHEDSTATS |
1152 | struct sched_statistics statistics; | |
94c18227 IM |
1153 | #endif |
1154 | ||
20b8a59f IM |
1155 | #ifdef CONFIG_FAIR_GROUP_SCHED |
1156 | struct sched_entity *parent; | |
1157 | /* rq on which this entity is (to be) queued: */ | |
1158 | struct cfs_rq *cfs_rq; | |
1159 | /* rq "owned" by this entity/group: */ | |
1160 | struct cfs_rq *my_q; | |
1161 | #endif | |
1162 | }; | |
70b97a7f | 1163 | |
fa717060 PZ |
1164 | struct sched_rt_entity { |
1165 | struct list_head run_list; | |
78f2c7db | 1166 | unsigned long timeout; |
bee367ed | 1167 | unsigned int time_slice; |
6f505b16 PZ |
1168 | int nr_cpus_allowed; |
1169 | ||
58d6c2d7 | 1170 | struct sched_rt_entity *back; |
052f1dc7 | 1171 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
1172 | struct sched_rt_entity *parent; |
1173 | /* rq on which this entity is (to be) queued: */ | |
1174 | struct rt_rq *rt_rq; | |
1175 | /* rq "owned" by this entity/group: */ | |
1176 | struct rt_rq *my_q; | |
1177 | #endif | |
fa717060 PZ |
1178 | }; |
1179 | ||
86848966 PM |
1180 | struct rcu_node; |
1181 | ||
8dc85d54 PZ |
1182 | enum perf_event_task_context { |
1183 | perf_invalid_context = -1, | |
1184 | perf_hw_context = 0, | |
89a1e187 | 1185 | perf_sw_context, |
8dc85d54 PZ |
1186 | perf_nr_task_contexts, |
1187 | }; | |
1188 | ||
1da177e4 LT |
1189 | struct task_struct { |
1190 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 1191 | void *stack; |
1da177e4 | 1192 | atomic_t usage; |
97dc32cd WC |
1193 | unsigned int flags; /* per process flags, defined below */ |
1194 | unsigned int ptrace; | |
1da177e4 | 1195 | |
36772092 | 1196 | int lock_depth; /* BKL lock depth */ |
1da177e4 | 1197 | |
2dd73a4f PW |
1198 | #ifdef CONFIG_SMP |
1199 | #ifdef __ARCH_WANT_UNLOCKED_CTXSW | |
4866cde0 NP |
1200 | int oncpu; |
1201 | #endif | |
2dd73a4f | 1202 | #endif |
50e645a8 | 1203 | |
b29739f9 | 1204 | int prio, static_prio, normal_prio; |
c7aceaba | 1205 | unsigned int rt_priority; |
5522d5d5 | 1206 | const struct sched_class *sched_class; |
20b8a59f | 1207 | struct sched_entity se; |
fa717060 | 1208 | struct sched_rt_entity rt; |
1da177e4 | 1209 | |
e107be36 AK |
1210 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1211 | /* list of struct preempt_notifier: */ | |
1212 | struct hlist_head preempt_notifiers; | |
1213 | #endif | |
1214 | ||
18796aa0 AD |
1215 | /* |
1216 | * fpu_counter contains the number of consecutive context switches | |
1217 | * that the FPU is used. If this is over a threshold, the lazy fpu | |
1218 | * saving becomes unlazy to save the trap. This is an unsigned char | |
1219 | * so that after 256 times the counter wraps and the behavior turns | |
1220 | * lazy again; this to deal with bursty apps that only use FPU for | |
1221 | * a short time | |
1222 | */ | |
1223 | unsigned char fpu_counter; | |
6c5c9341 | 1224 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 1225 | unsigned int btrace_seq; |
6c5c9341 | 1226 | #endif |
1da177e4 | 1227 | |
97dc32cd | 1228 | unsigned int policy; |
1da177e4 | 1229 | cpumask_t cpus_allowed; |
1da177e4 | 1230 | |
a57eb940 | 1231 | #ifdef CONFIG_PREEMPT_RCU |
e260be67 | 1232 | int rcu_read_lock_nesting; |
f41d911f | 1233 | char rcu_read_unlock_special; |
f41d911f | 1234 | struct list_head rcu_node_entry; |
a57eb940 PM |
1235 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
1236 | #ifdef CONFIG_TREE_PREEMPT_RCU | |
1237 | struct rcu_node *rcu_blocked_node; | |
f41d911f | 1238 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
24278d14 PM |
1239 | #ifdef CONFIG_RCU_BOOST |
1240 | struct rt_mutex *rcu_boost_mutex; | |
1241 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
e260be67 | 1242 | |
52f17b6c | 1243 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
1244 | struct sched_info sched_info; |
1245 | #endif | |
1246 | ||
1247 | struct list_head tasks; | |
806c09a7 | 1248 | #ifdef CONFIG_SMP |
917b627d | 1249 | struct plist_node pushable_tasks; |
806c09a7 | 1250 | #endif |
1da177e4 LT |
1251 | |
1252 | struct mm_struct *mm, *active_mm; | |
34e55232 KH |
1253 | #if defined(SPLIT_RSS_COUNTING) |
1254 | struct task_rss_stat rss_stat; | |
1255 | #endif | |
1da177e4 | 1256 | /* task state */ |
97dc32cd | 1257 | int exit_state; |
1da177e4 LT |
1258 | int exit_code, exit_signal; |
1259 | int pdeath_signal; /* The signal sent when the parent dies */ | |
1260 | /* ??? */ | |
97dc32cd | 1261 | unsigned int personality; |
1da177e4 | 1262 | unsigned did_exec:1; |
f9ce1f1c KT |
1263 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
1264 | * execve */ | |
8f0dfc34 AV |
1265 | unsigned in_iowait:1; |
1266 | ||
ca94c442 LP |
1267 | |
1268 | /* Revert to default priority/policy when forking */ | |
1269 | unsigned sched_reset_on_fork:1; | |
1270 | ||
1da177e4 LT |
1271 | pid_t pid; |
1272 | pid_t tgid; | |
0a425405 | 1273 | |
1314562a | 1274 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
1275 | /* Canary value for the -fstack-protector gcc feature */ |
1276 | unsigned long stack_canary; | |
1314562a | 1277 | #endif |
e0032087 | 1278 | |
1da177e4 LT |
1279 | /* |
1280 | * pointers to (original) parent process, youngest child, younger sibling, | |
1281 | * older sibling, respectively. (p->father can be replaced with | |
f470021a | 1282 | * p->real_parent->pid) |
1da177e4 | 1283 | */ |
f470021a RM |
1284 | struct task_struct *real_parent; /* real parent process */ |
1285 | struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 1286 | /* |
f470021a | 1287 | * children/sibling forms the list of my natural children |
1da177e4 LT |
1288 | */ |
1289 | struct list_head children; /* list of my children */ | |
1290 | struct list_head sibling; /* linkage in my parent's children list */ | |
1291 | struct task_struct *group_leader; /* threadgroup leader */ | |
1292 | ||
f470021a RM |
1293 | /* |
1294 | * ptraced is the list of tasks this task is using ptrace on. | |
1295 | * This includes both natural children and PTRACE_ATTACH targets. | |
1296 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
1297 | */ | |
1298 | struct list_head ptraced; | |
1299 | struct list_head ptrace_entry; | |
1300 | ||
1da177e4 | 1301 | /* PID/PID hash table linkage. */ |
92476d7f | 1302 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1303 | struct list_head thread_group; |
1da177e4 LT |
1304 | |
1305 | struct completion *vfork_done; /* for vfork() */ | |
1306 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1307 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1308 | ||
c66f08be | 1309 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1310 | cputime_t gtime; |
d99ca3b9 | 1311 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
9301899b | 1312 | cputime_t prev_utime, prev_stime; |
d99ca3b9 | 1313 | #endif |
1da177e4 | 1314 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
924b42d5 TJ |
1315 | struct timespec start_time; /* monotonic time */ |
1316 | struct timespec real_start_time; /* boot based time */ | |
1da177e4 LT |
1317 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1318 | unsigned long min_flt, maj_flt; | |
1319 | ||
f06febc9 | 1320 | struct task_cputime cputime_expires; |
1da177e4 LT |
1321 | struct list_head cpu_timers[3]; |
1322 | ||
1323 | /* process credentials */ | |
1b0ba1c9 | 1324 | const struct cred __rcu *real_cred; /* objective and real subjective task |
3b11a1de | 1325 | * credentials (COW) */ |
1b0ba1c9 | 1326 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
3b11a1de | 1327 | * credentials (COW) */ |
ee18d64c | 1328 | struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */ |
b6dff3ec | 1329 | |
36772092 PBG |
1330 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1331 | - access with [gs]et_task_comm (which lock | |
1332 | it with task_lock()) | |
221af7f8 | 1333 | - initialized normally by setup_new_exec */ |
1da177e4 LT |
1334 | /* file system info */ |
1335 | int link_count, total_link_count; | |
3d5b6fcc | 1336 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1337 | /* ipc stuff */ |
1338 | struct sysv_sem sysvsem; | |
3d5b6fcc | 1339 | #endif |
e162b39a | 1340 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 1341 | /* hung task detection */ |
82a1fcb9 IM |
1342 | unsigned long last_switch_count; |
1343 | #endif | |
1da177e4 LT |
1344 | /* CPU-specific state of this task */ |
1345 | struct thread_struct thread; | |
1346 | /* filesystem information */ | |
1347 | struct fs_struct *fs; | |
1348 | /* open file information */ | |
1349 | struct files_struct *files; | |
1651e14e | 1350 | /* namespaces */ |
ab516013 | 1351 | struct nsproxy *nsproxy; |
1da177e4 LT |
1352 | /* signal handlers */ |
1353 | struct signal_struct *signal; | |
1354 | struct sighand_struct *sighand; | |
1355 | ||
1356 | sigset_t blocked, real_blocked; | |
f3de272b | 1357 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
1358 | struct sigpending pending; |
1359 | ||
1360 | unsigned long sas_ss_sp; | |
1361 | size_t sas_ss_size; | |
1362 | int (*notifier)(void *priv); | |
1363 | void *notifier_data; | |
1364 | sigset_t *notifier_mask; | |
1da177e4 | 1365 | struct audit_context *audit_context; |
bfef93a5 AV |
1366 | #ifdef CONFIG_AUDITSYSCALL |
1367 | uid_t loginuid; | |
4746ec5b | 1368 | unsigned int sessionid; |
bfef93a5 | 1369 | #endif |
1da177e4 LT |
1370 | seccomp_t seccomp; |
1371 | ||
1372 | /* Thread group tracking */ | |
1373 | u32 parent_exec_id; | |
1374 | u32 self_exec_id; | |
58568d2a MX |
1375 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1376 | * mempolicy */ | |
1da177e4 | 1377 | spinlock_t alloc_lock; |
1da177e4 | 1378 | |
3aa551c9 TG |
1379 | #ifdef CONFIG_GENERIC_HARDIRQS |
1380 | /* IRQ handler threads */ | |
1381 | struct irqaction *irqaction; | |
1382 | #endif | |
1383 | ||
b29739f9 | 1384 | /* Protection of the PI data structures: */ |
1d615482 | 1385 | raw_spinlock_t pi_lock; |
b29739f9 | 1386 | |
23f78d4a IM |
1387 | #ifdef CONFIG_RT_MUTEXES |
1388 | /* PI waiters blocked on a rt_mutex held by this task */ | |
1389 | struct plist_head pi_waiters; | |
1390 | /* Deadlock detection and priority inheritance handling */ | |
1391 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1392 | #endif |
1393 | ||
408894ee IM |
1394 | #ifdef CONFIG_DEBUG_MUTEXES |
1395 | /* mutex deadlock detection */ | |
1396 | struct mutex_waiter *blocked_on; | |
1397 | #endif | |
de30a2b3 IM |
1398 | #ifdef CONFIG_TRACE_IRQFLAGS |
1399 | unsigned int irq_events; | |
de30a2b3 | 1400 | unsigned long hardirq_enable_ip; |
de30a2b3 | 1401 | unsigned long hardirq_disable_ip; |
fa1452e8 | 1402 | unsigned int hardirq_enable_event; |
de30a2b3 | 1403 | unsigned int hardirq_disable_event; |
fa1452e8 HS |
1404 | int hardirqs_enabled; |
1405 | int hardirq_context; | |
de30a2b3 | 1406 | unsigned long softirq_disable_ip; |
de30a2b3 | 1407 | unsigned long softirq_enable_ip; |
fa1452e8 | 1408 | unsigned int softirq_disable_event; |
de30a2b3 | 1409 | unsigned int softirq_enable_event; |
fa1452e8 | 1410 | int softirqs_enabled; |
de30a2b3 IM |
1411 | int softirq_context; |
1412 | #endif | |
fbb9ce95 | 1413 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 1414 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
1415 | u64 curr_chain_key; |
1416 | int lockdep_depth; | |
fbb9ce95 | 1417 | unsigned int lockdep_recursion; |
c7aceaba | 1418 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 1419 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 1420 | #endif |
408894ee | 1421 | |
1da177e4 LT |
1422 | /* journalling filesystem info */ |
1423 | void *journal_info; | |
1424 | ||
d89d8796 | 1425 | /* stacked block device info */ |
bddd87c7 | 1426 | struct bio_list *bio_list; |
d89d8796 | 1427 | |
1da177e4 LT |
1428 | /* VM state */ |
1429 | struct reclaim_state *reclaim_state; | |
1430 | ||
1da177e4 LT |
1431 | struct backing_dev_info *backing_dev_info; |
1432 | ||
1433 | struct io_context *io_context; | |
1434 | ||
1435 | unsigned long ptrace_message; | |
1436 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 1437 | struct task_io_accounting ioac; |
8f0ab514 | 1438 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1439 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1440 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
49b5cf34 | 1441 | cputime_t acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
1442 | #endif |
1443 | #ifdef CONFIG_CPUSETS | |
58568d2a | 1444 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
c0ff7453 | 1445 | int mems_allowed_change_disable; |
825a46af | 1446 | int cpuset_mem_spread_rotor; |
6adef3eb | 1447 | int cpuset_slab_spread_rotor; |
1da177e4 | 1448 | #endif |
ddbcc7e8 | 1449 | #ifdef CONFIG_CGROUPS |
817929ec | 1450 | /* Control Group info protected by css_set_lock */ |
2c392b8c | 1451 | struct css_set __rcu *cgroups; |
817929ec PM |
1452 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
1453 | struct list_head cg_list; | |
ddbcc7e8 | 1454 | #endif |
42b2dd0a | 1455 | #ifdef CONFIG_FUTEX |
0771dfef | 1456 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1457 | #ifdef CONFIG_COMPAT |
1458 | struct compat_robust_list_head __user *compat_robust_list; | |
1459 | #endif | |
c87e2837 IM |
1460 | struct list_head pi_state_list; |
1461 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1462 | #endif |
cdd6c482 | 1463 | #ifdef CONFIG_PERF_EVENTS |
8dc85d54 | 1464 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
cdd6c482 IM |
1465 | struct mutex perf_event_mutex; |
1466 | struct list_head perf_event_list; | |
a63eaf34 | 1467 | #endif |
c7aceaba | 1468 | #ifdef CONFIG_NUMA |
58568d2a | 1469 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 1470 | short il_next; |
42b2dd0a | 1471 | #endif |
22e2c507 | 1472 | atomic_t fs_excl; /* holding fs exclusive resources */ |
e56d0903 | 1473 | struct rcu_head rcu; |
b92ce558 JA |
1474 | |
1475 | /* | |
1476 | * cache last used pipe for splice | |
1477 | */ | |
1478 | struct pipe_inode_info *splice_pipe; | |
ca74e92b SN |
1479 | #ifdef CONFIG_TASK_DELAY_ACCT |
1480 | struct task_delay_info *delays; | |
f4f154fd AM |
1481 | #endif |
1482 | #ifdef CONFIG_FAULT_INJECTION | |
1483 | int make_it_fail; | |
ca74e92b | 1484 | #endif |
3e26c149 | 1485 | struct prop_local_single dirties; |
9745512c AV |
1486 | #ifdef CONFIG_LATENCYTOP |
1487 | int latency_record_count; | |
1488 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1489 | #endif | |
6976675d AV |
1490 | /* |
1491 | * time slack values; these are used to round up poll() and | |
1492 | * select() etc timeout values. These are in nanoseconds. | |
1493 | */ | |
1494 | unsigned long timer_slack_ns; | |
1495 | unsigned long default_timer_slack_ns; | |
f8d570a4 DM |
1496 | |
1497 | struct list_head *scm_work_list; | |
fb52607a | 1498 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
3ad2f3fb | 1499 | /* Index of current stored address in ret_stack */ |
f201ae23 FW |
1500 | int curr_ret_stack; |
1501 | /* Stack of return addresses for return function tracing */ | |
1502 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
1503 | /* time stamp for last schedule */ |
1504 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
1505 | /* |
1506 | * Number of functions that haven't been traced | |
1507 | * because of depth overrun. | |
1508 | */ | |
1509 | atomic_t trace_overrun; | |
380c4b14 FW |
1510 | /* Pause for the tracing */ |
1511 | atomic_t tracing_graph_pause; | |
f201ae23 | 1512 | #endif |
ea4e2bc4 SR |
1513 | #ifdef CONFIG_TRACING |
1514 | /* state flags for use by tracers */ | |
1515 | unsigned long trace; | |
261842b7 SR |
1516 | /* bitmask of trace recursion */ |
1517 | unsigned long trace_recursion; | |
1518 | #endif /* CONFIG_TRACING */ | |
569b846d KH |
1519 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */ |
1520 | struct memcg_batch_info { | |
1521 | int do_batch; /* incremented when batch uncharge started */ | |
1522 | struct mem_cgroup *memcg; /* target memcg of uncharge */ | |
1523 | unsigned long bytes; /* uncharged usage */ | |
1524 | unsigned long memsw_bytes; /* uncharged mem+swap usage */ | |
1525 | } memcg_batch; | |
1526 | #endif | |
1da177e4 LT |
1527 | }; |
1528 | ||
76e6eee0 | 1529 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
a4636818 | 1530 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
76e6eee0 | 1531 | |
e05606d3 IM |
1532 | /* |
1533 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT | |
1534 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH | |
1535 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority | |
1536 | * values are inverted: lower p->prio value means higher priority. | |
1537 | * | |
1538 | * The MAX_USER_RT_PRIO value allows the actual maximum | |
1539 | * RT priority to be separate from the value exported to | |
1540 | * user-space. This allows kernel threads to set their | |
1541 | * priority to a value higher than any user task. Note: | |
1542 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. | |
1543 | */ | |
1544 | ||
1545 | #define MAX_USER_RT_PRIO 100 | |
1546 | #define MAX_RT_PRIO MAX_USER_RT_PRIO | |
1547 | ||
1548 | #define MAX_PRIO (MAX_RT_PRIO + 40) | |
1549 | #define DEFAULT_PRIO (MAX_RT_PRIO + 20) | |
1550 | ||
1551 | static inline int rt_prio(int prio) | |
1552 | { | |
1553 | if (unlikely(prio < MAX_RT_PRIO)) | |
1554 | return 1; | |
1555 | return 0; | |
1556 | } | |
1557 | ||
e868171a | 1558 | static inline int rt_task(struct task_struct *p) |
e05606d3 IM |
1559 | { |
1560 | return rt_prio(p->prio); | |
1561 | } | |
1562 | ||
e868171a | 1563 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1564 | { |
1565 | return task->pids[PIDTYPE_PID].pid; | |
1566 | } | |
1567 | ||
e868171a | 1568 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1569 | { |
1570 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1571 | } | |
1572 | ||
6dda81f4 ON |
1573 | /* |
1574 | * Without tasklist or rcu lock it is not safe to dereference | |
1575 | * the result of task_pgrp/task_session even if task == current, | |
1576 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1577 | */ | |
e868171a | 1578 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1579 | { |
1580 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1581 | } | |
1582 | ||
e868171a | 1583 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1584 | { |
1585 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1586 | } | |
1587 | ||
7af57294 PE |
1588 | struct pid_namespace; |
1589 | ||
1590 | /* | |
1591 | * the helpers to get the task's different pids as they are seen | |
1592 | * from various namespaces | |
1593 | * | |
1594 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1595 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1596 | * current. | |
7af57294 PE |
1597 | * task_xid_nr_ns() : id seen from the ns specified; |
1598 | * | |
1599 | * set_task_vxid() : assigns a virtual id to a task; | |
1600 | * | |
7af57294 PE |
1601 | * see also pid_nr() etc in include/linux/pid.h |
1602 | */ | |
52ee2dfd ON |
1603 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1604 | struct pid_namespace *ns); | |
7af57294 | 1605 | |
e868171a | 1606 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1607 | { |
1608 | return tsk->pid; | |
1609 | } | |
1610 | ||
52ee2dfd ON |
1611 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1612 | struct pid_namespace *ns) | |
1613 | { | |
1614 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1615 | } | |
7af57294 PE |
1616 | |
1617 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1618 | { | |
52ee2dfd | 1619 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1620 | } |
1621 | ||
1622 | ||
e868171a | 1623 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1624 | { |
1625 | return tsk->tgid; | |
1626 | } | |
1627 | ||
2f2a3a46 | 1628 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1629 | |
1630 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1631 | { | |
1632 | return pid_vnr(task_tgid(tsk)); | |
1633 | } | |
1634 | ||
1635 | ||
52ee2dfd ON |
1636 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1637 | struct pid_namespace *ns) | |
7af57294 | 1638 | { |
52ee2dfd | 1639 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1640 | } |
1641 | ||
7af57294 PE |
1642 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1643 | { | |
52ee2dfd | 1644 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1645 | } |
1646 | ||
1647 | ||
52ee2dfd ON |
1648 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1649 | struct pid_namespace *ns) | |
7af57294 | 1650 | { |
52ee2dfd | 1651 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1652 | } |
1653 | ||
7af57294 PE |
1654 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1655 | { | |
52ee2dfd | 1656 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1657 | } |
1658 | ||
1b0f7ffd ON |
1659 | /* obsolete, do not use */ |
1660 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1661 | { | |
1662 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1663 | } | |
7af57294 | 1664 | |
1da177e4 LT |
1665 | /** |
1666 | * pid_alive - check that a task structure is not stale | |
1667 | * @p: Task structure to be checked. | |
1668 | * | |
1669 | * Test if a process is not yet dead (at most zombie state) | |
1670 | * If pid_alive fails, then pointers within the task structure | |
1671 | * can be stale and must not be dereferenced. | |
1672 | */ | |
e868171a | 1673 | static inline int pid_alive(struct task_struct *p) |
1da177e4 | 1674 | { |
92476d7f | 1675 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1676 | } |
1677 | ||
f400e198 | 1678 | /** |
b460cbc5 | 1679 | * is_global_init - check if a task structure is init |
3260259f H |
1680 | * @tsk: Task structure to be checked. |
1681 | * | |
1682 | * Check if a task structure is the first user space task the kernel created. | |
b460cbc5 | 1683 | */ |
e868171a | 1684 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
1685 | { |
1686 | return tsk->pid == 1; | |
1687 | } | |
b460cbc5 SH |
1688 | |
1689 | /* | |
1690 | * is_container_init: | |
1691 | * check whether in the task is init in its own pid namespace. | |
f400e198 | 1692 | */ |
b461cc03 | 1693 | extern int is_container_init(struct task_struct *tsk); |
f400e198 | 1694 | |
9ec52099 CLG |
1695 | extern struct pid *cad_pid; |
1696 | ||
1da177e4 | 1697 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1698 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1699 | |
158d9ebd | 1700 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1701 | |
1702 | static inline void put_task_struct(struct task_struct *t) | |
1703 | { | |
1704 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1705 | __put_task_struct(t); |
e56d0903 | 1706 | } |
1da177e4 | 1707 | |
d180c5bc | 1708 | extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
0cf55e1e | 1709 | extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
49048622 | 1710 | |
1da177e4 LT |
1711 | /* |
1712 | * Per process flags | |
1713 | */ | |
6cdd5199 | 1714 | #define PF_KSOFTIRQD 0x00000001 /* I am ksoftirqd */ |
1da177e4 LT |
1715 | #define PF_STARTING 0x00000002 /* being created */ |
1716 | #define PF_EXITING 0x00000004 /* getting shut down */ | |
778e9a9c | 1717 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1718 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
21aa9af0 | 1719 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1da177e4 | 1720 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
4db96cf0 | 1721 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1da177e4 LT |
1722 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
1723 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1724 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1725 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
1da177e4 | 1726 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
6301cb95 | 1727 | #define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */ |
1da177e4 LT |
1728 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1729 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1730 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1731 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
35451bee | 1732 | #define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */ |
1da177e4 | 1733 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 1734 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
1735 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
1736 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
1737 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ | |
1738 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ | |
9985b0ba | 1739 | #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ |
4db96cf0 | 1740 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
c61afb18 | 1741 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
61a87122 | 1742 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
ba96a0c8 | 1743 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ |
ebb12db5 | 1744 | #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ |
1da177e4 LT |
1745 | |
1746 | /* | |
1747 | * Only the _current_ task can read/write to tsk->flags, but other | |
1748 | * tasks can access tsk->flags in readonly mode for example | |
1749 | * with tsk_used_math (like during threaded core dumping). | |
1750 | * There is however an exception to this rule during ptrace | |
1751 | * or during fork: the ptracer task is allowed to write to the | |
1752 | * child->flags of its traced child (same goes for fork, the parent | |
1753 | * can write to the child->flags), because we're guaranteed the | |
1754 | * child is not running and in turn not changing child->flags | |
1755 | * at the same time the parent does it. | |
1756 | */ | |
1757 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1758 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1759 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1760 | #define set_used_math() set_stopped_child_used_math(current) | |
1761 | #define conditional_stopped_child_used_math(condition, child) \ | |
1762 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1763 | #define conditional_used_math(condition) \ | |
1764 | conditional_stopped_child_used_math(condition, current) | |
1765 | #define copy_to_stopped_child_used_math(child) \ | |
1766 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1767 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1768 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1769 | #define used_math() tsk_used_math(current) | |
1770 | ||
a57eb940 | 1771 | #ifdef CONFIG_PREEMPT_RCU |
f41d911f PM |
1772 | |
1773 | #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ | |
24278d14 PM |
1774 | #define RCU_READ_UNLOCK_BOOSTED (1 << 1) /* boosted while in RCU read-side. */ |
1775 | #define RCU_READ_UNLOCK_NEED_QS (1 << 2) /* RCU core needs CPU response. */ | |
f41d911f PM |
1776 | |
1777 | static inline void rcu_copy_process(struct task_struct *p) | |
1778 | { | |
1779 | p->rcu_read_lock_nesting = 0; | |
1780 | p->rcu_read_unlock_special = 0; | |
a57eb940 | 1781 | #ifdef CONFIG_TREE_PREEMPT_RCU |
dd5d19ba | 1782 | p->rcu_blocked_node = NULL; |
24278d14 PM |
1783 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
1784 | #ifdef CONFIG_RCU_BOOST | |
1785 | p->rcu_boost_mutex = NULL; | |
1786 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
f41d911f PM |
1787 | INIT_LIST_HEAD(&p->rcu_node_entry); |
1788 | } | |
1789 | ||
f41d911f PM |
1790 | #else |
1791 | ||
1792 | static inline void rcu_copy_process(struct task_struct *p) | |
1793 | { | |
1794 | } | |
1795 | ||
1796 | #endif | |
1797 | ||
1da177e4 | 1798 | #ifdef CONFIG_SMP |
cd8ba7cd | 1799 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1800 | const struct cpumask *new_mask); |
1da177e4 | 1801 | #else |
cd8ba7cd | 1802 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1803 | const struct cpumask *new_mask) |
1da177e4 | 1804 | { |
96f874e2 | 1805 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1806 | return -EINVAL; |
1807 | return 0; | |
1808 | } | |
1809 | #endif | |
e0ad9556 RR |
1810 | |
1811 | #ifndef CONFIG_CPUMASK_OFFSTACK | |
cd8ba7cd MT |
1812 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
1813 | { | |
1814 | return set_cpus_allowed_ptr(p, &new_mask); | |
1815 | } | |
e0ad9556 | 1816 | #endif |
1da177e4 | 1817 | |
b342501c | 1818 | /* |
c676329a PZ |
1819 | * Do not use outside of architecture code which knows its limitations. |
1820 | * | |
1821 | * sched_clock() has no promise of monotonicity or bounded drift between | |
1822 | * CPUs, use (which you should not) requires disabling IRQs. | |
1823 | * | |
1824 | * Please use one of the three interfaces below. | |
b342501c | 1825 | */ |
1bbfa6f2 | 1826 | extern unsigned long long notrace sched_clock(void); |
c676329a PZ |
1827 | /* |
1828 | * See the comment in kernel/sched_clock.c | |
1829 | */ | |
1830 | extern u64 cpu_clock(int cpu); | |
1831 | extern u64 local_clock(void); | |
1832 | extern u64 sched_clock_cpu(int cpu); | |
1833 | ||
e436d800 | 1834 | |
c1955a3d | 1835 | extern void sched_clock_init(void); |
3e51f33f | 1836 | |
c1955a3d | 1837 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
3e51f33f PZ |
1838 | static inline void sched_clock_tick(void) |
1839 | { | |
1840 | } | |
1841 | ||
1842 | static inline void sched_clock_idle_sleep_event(void) | |
1843 | { | |
1844 | } | |
1845 | ||
1846 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) | |
1847 | { | |
1848 | } | |
1849 | #else | |
c676329a PZ |
1850 | /* |
1851 | * Architectures can set this to 1 if they have specified | |
1852 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, | |
1853 | * but then during bootup it turns out that sched_clock() | |
1854 | * is reliable after all: | |
1855 | */ | |
1856 | extern int sched_clock_stable; | |
1857 | ||
3e51f33f PZ |
1858 | extern void sched_clock_tick(void); |
1859 | extern void sched_clock_idle_sleep_event(void); | |
1860 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
1861 | #endif | |
1862 | ||
b52bfee4 VP |
1863 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
1864 | /* | |
1865 | * An i/f to runtime opt-in for irq time accounting based off of sched_clock. | |
1866 | * The reason for this explicit opt-in is not to have perf penalty with | |
1867 | * slow sched_clocks. | |
1868 | */ | |
1869 | extern void enable_sched_clock_irqtime(void); | |
1870 | extern void disable_sched_clock_irqtime(void); | |
1871 | #else | |
1872 | static inline void enable_sched_clock_irqtime(void) {} | |
1873 | static inline void disable_sched_clock_irqtime(void) {} | |
1874 | #endif | |
1875 | ||
36c8b586 | 1876 | extern unsigned long long |
41b86e9c | 1877 | task_sched_runtime(struct task_struct *task); |
f06febc9 | 1878 | extern unsigned long long thread_group_sched_runtime(struct task_struct *task); |
1da177e4 LT |
1879 | |
1880 | /* sched_exec is called by processes performing an exec */ | |
1881 | #ifdef CONFIG_SMP | |
1882 | extern void sched_exec(void); | |
1883 | #else | |
1884 | #define sched_exec() {} | |
1885 | #endif | |
1886 | ||
2aa44d05 IM |
1887 | extern void sched_clock_idle_sleep_event(void); |
1888 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 1889 | |
1da177e4 LT |
1890 | #ifdef CONFIG_HOTPLUG_CPU |
1891 | extern void idle_task_exit(void); | |
1892 | #else | |
1893 | static inline void idle_task_exit(void) {} | |
1894 | #endif | |
1895 | ||
06d8308c TG |
1896 | #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) |
1897 | extern void wake_up_idle_cpu(int cpu); | |
1898 | #else | |
1899 | static inline void wake_up_idle_cpu(int cpu) { } | |
1900 | #endif | |
1901 | ||
21805085 | 1902 | extern unsigned int sysctl_sched_latency; |
b2be5e96 | 1903 | extern unsigned int sysctl_sched_min_granularity; |
bf0f6f24 | 1904 | extern unsigned int sysctl_sched_wakeup_granularity; |
bf0f6f24 | 1905 | extern unsigned int sysctl_sched_child_runs_first; |
1983a922 CE |
1906 | |
1907 | enum sched_tunable_scaling { | |
1908 | SCHED_TUNABLESCALING_NONE, | |
1909 | SCHED_TUNABLESCALING_LOG, | |
1910 | SCHED_TUNABLESCALING_LINEAR, | |
1911 | SCHED_TUNABLESCALING_END, | |
1912 | }; | |
1913 | extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; | |
1914 | ||
2bba22c5 | 1915 | #ifdef CONFIG_SCHED_DEBUG |
da84d961 | 1916 | extern unsigned int sysctl_sched_migration_cost; |
b82d9fdd | 1917 | extern unsigned int sysctl_sched_nr_migrate; |
e9e9250b | 1918 | extern unsigned int sysctl_sched_time_avg; |
cd1bb94b | 1919 | extern unsigned int sysctl_timer_migration; |
a7a4f8a7 | 1920 | extern unsigned int sysctl_sched_shares_window; |
b2be5e96 | 1921 | |
1983a922 | 1922 | int sched_proc_update_handler(struct ctl_table *table, int write, |
8d65af78 | 1923 | void __user *buffer, size_t *length, |
b2be5e96 | 1924 | loff_t *ppos); |
2bd8e6d4 | 1925 | #endif |
eea08f32 AB |
1926 | #ifdef CONFIG_SCHED_DEBUG |
1927 | static inline unsigned int get_sysctl_timer_migration(void) | |
1928 | { | |
1929 | return sysctl_timer_migration; | |
1930 | } | |
1931 | #else | |
1932 | static inline unsigned int get_sysctl_timer_migration(void) | |
1933 | { | |
1934 | return 1; | |
1935 | } | |
1936 | #endif | |
9f0c1e56 PZ |
1937 | extern unsigned int sysctl_sched_rt_period; |
1938 | extern int sysctl_sched_rt_runtime; | |
2bd8e6d4 | 1939 | |
d0b27fa7 | 1940 | int sched_rt_handler(struct ctl_table *table, int write, |
8d65af78 | 1941 | void __user *buffer, size_t *lenp, |
d0b27fa7 PZ |
1942 | loff_t *ppos); |
1943 | ||
2bd8e6d4 | 1944 | extern unsigned int sysctl_sched_compat_yield; |
bf0f6f24 | 1945 | |
5091faa4 MG |
1946 | #ifdef CONFIG_SCHED_AUTOGROUP |
1947 | extern unsigned int sysctl_sched_autogroup_enabled; | |
1948 | ||
1949 | extern void sched_autogroup_create_attach(struct task_struct *p); | |
1950 | extern void sched_autogroup_detach(struct task_struct *p); | |
1951 | extern void sched_autogroup_fork(struct signal_struct *sig); | |
1952 | extern void sched_autogroup_exit(struct signal_struct *sig); | |
1953 | #ifdef CONFIG_PROC_FS | |
1954 | extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); | |
1955 | extern int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice); | |
1956 | #endif | |
1957 | #else | |
1958 | static inline void sched_autogroup_create_attach(struct task_struct *p) { } | |
1959 | static inline void sched_autogroup_detach(struct task_struct *p) { } | |
1960 | static inline void sched_autogroup_fork(struct signal_struct *sig) { } | |
1961 | static inline void sched_autogroup_exit(struct signal_struct *sig) { } | |
1962 | #endif | |
1963 | ||
b29739f9 | 1964 | #ifdef CONFIG_RT_MUTEXES |
36c8b586 IM |
1965 | extern int rt_mutex_getprio(struct task_struct *p); |
1966 | extern void rt_mutex_setprio(struct task_struct *p, int prio); | |
1967 | extern void rt_mutex_adjust_pi(struct task_struct *p); | |
b29739f9 | 1968 | #else |
e868171a | 1969 | static inline int rt_mutex_getprio(struct task_struct *p) |
b29739f9 IM |
1970 | { |
1971 | return p->normal_prio; | |
1972 | } | |
95e02ca9 | 1973 | # define rt_mutex_adjust_pi(p) do { } while (0) |
b29739f9 IM |
1974 | #endif |
1975 | ||
36c8b586 IM |
1976 | extern void set_user_nice(struct task_struct *p, long nice); |
1977 | extern int task_prio(const struct task_struct *p); | |
1978 | extern int task_nice(const struct task_struct *p); | |
1979 | extern int can_nice(const struct task_struct *p, const int nice); | |
1980 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 1981 | extern int idle_cpu(int cpu); |
fe7de49f KM |
1982 | extern int sched_setscheduler(struct task_struct *, int, |
1983 | const struct sched_param *); | |
961ccddd | 1984 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
fe7de49f | 1985 | const struct sched_param *); |
36c8b586 IM |
1986 | extern struct task_struct *idle_task(int cpu); |
1987 | extern struct task_struct *curr_task(int cpu); | |
1988 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
1989 | |
1990 | void yield(void); | |
1991 | ||
1992 | /* | |
1993 | * The default (Linux) execution domain. | |
1994 | */ | |
1995 | extern struct exec_domain default_exec_domain; | |
1996 | ||
1997 | union thread_union { | |
1998 | struct thread_info thread_info; | |
1999 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
2000 | }; | |
2001 | ||
2002 | #ifndef __HAVE_ARCH_KSTACK_END | |
2003 | static inline int kstack_end(void *addr) | |
2004 | { | |
2005 | /* Reliable end of stack detection: | |
2006 | * Some APM bios versions misalign the stack | |
2007 | */ | |
2008 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
2009 | } | |
2010 | #endif | |
2011 | ||
2012 | extern union thread_union init_thread_union; | |
2013 | extern struct task_struct init_task; | |
2014 | ||
2015 | extern struct mm_struct init_mm; | |
2016 | ||
198fe21b PE |
2017 | extern struct pid_namespace init_pid_ns; |
2018 | ||
2019 | /* | |
2020 | * find a task by one of its numerical ids | |
2021 | * | |
198fe21b PE |
2022 | * find_task_by_pid_ns(): |
2023 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
2024 | * find_task_by_vpid(): |
2025 | * finds a task by its virtual pid | |
198fe21b | 2026 | * |
e49859e7 | 2027 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
2028 | */ |
2029 | ||
228ebcbe PE |
2030 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
2031 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
2032 | struct pid_namespace *ns); | |
198fe21b | 2033 | |
8520d7c7 | 2034 | extern void __set_special_pids(struct pid *pid); |
1da177e4 LT |
2035 | |
2036 | /* per-UID process charging. */ | |
acce292c | 2037 | extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); |
1da177e4 LT |
2038 | static inline struct user_struct *get_uid(struct user_struct *u) |
2039 | { | |
2040 | atomic_inc(&u->__count); | |
2041 | return u; | |
2042 | } | |
2043 | extern void free_uid(struct user_struct *); | |
28f300d2 | 2044 | extern void release_uids(struct user_namespace *ns); |
1da177e4 LT |
2045 | |
2046 | #include <asm/current.h> | |
2047 | ||
3171a030 | 2048 | extern void do_timer(unsigned long ticks); |
1da177e4 | 2049 | |
b3c97528 HH |
2050 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
2051 | extern int wake_up_process(struct task_struct *tsk); | |
2052 | extern void wake_up_new_task(struct task_struct *tsk, | |
2053 | unsigned long clone_flags); | |
1da177e4 LT |
2054 | #ifdef CONFIG_SMP |
2055 | extern void kick_process(struct task_struct *tsk); | |
2056 | #else | |
2057 | static inline void kick_process(struct task_struct *tsk) { } | |
2058 | #endif | |
ad46c2c4 IM |
2059 | extern void sched_fork(struct task_struct *p, int clone_flags); |
2060 | extern void sched_dead(struct task_struct *p); | |
1da177e4 | 2061 | |
1da177e4 LT |
2062 | extern void proc_caches_init(void); |
2063 | extern void flush_signals(struct task_struct *); | |
3bcac026 | 2064 | extern void __flush_signals(struct task_struct *); |
10ab825b | 2065 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
2066 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
2067 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
2068 | ||
2069 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
2070 | { | |
2071 | unsigned long flags; | |
2072 | int ret; | |
2073 | ||
2074 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
2075 | ret = dequeue_signal(tsk, mask, info); | |
2076 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
2077 | ||
2078 | return ret; | |
2079 | } | |
2080 | ||
2081 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
2082 | sigset_t *mask); | |
2083 | extern void unblock_all_signals(void); | |
2084 | extern void release_task(struct task_struct * p); | |
2085 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1da177e4 LT |
2086 | extern int force_sigsegv(int, struct task_struct *); |
2087 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 | 2088 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
c4b92fc1 | 2089 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
2425c08b | 2090 | extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); |
c4b92fc1 EB |
2091 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
2092 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 2093 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
2b2a1ff6 | 2094 | extern int do_notify_parent(struct task_struct *, int); |
a7f0765e | 2095 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); |
1da177e4 | 2096 | extern void force_sig(int, struct task_struct *); |
1da177e4 | 2097 | extern int send_sig(int, struct task_struct *, int); |
09faef11 | 2098 | extern int zap_other_threads(struct task_struct *p); |
1da177e4 LT |
2099 | extern struct sigqueue *sigqueue_alloc(void); |
2100 | extern void sigqueue_free(struct sigqueue *); | |
ac5c2153 | 2101 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
9ac95f2f | 2102 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 LT |
2103 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
2104 | ||
9ec52099 CLG |
2105 | static inline int kill_cad_pid(int sig, int priv) |
2106 | { | |
2107 | return kill_pid(cad_pid, sig, priv); | |
2108 | } | |
2109 | ||
1da177e4 LT |
2110 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
2111 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
2112 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
2113 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
2114 | ||
2a855dd0 SAS |
2115 | /* |
2116 | * True if we are on the alternate signal stack. | |
2117 | */ | |
1da177e4 LT |
2118 | static inline int on_sig_stack(unsigned long sp) |
2119 | { | |
2a855dd0 SAS |
2120 | #ifdef CONFIG_STACK_GROWSUP |
2121 | return sp >= current->sas_ss_sp && | |
2122 | sp - current->sas_ss_sp < current->sas_ss_size; | |
2123 | #else | |
2124 | return sp > current->sas_ss_sp && | |
2125 | sp - current->sas_ss_sp <= current->sas_ss_size; | |
2126 | #endif | |
1da177e4 LT |
2127 | } |
2128 | ||
2129 | static inline int sas_ss_flags(unsigned long sp) | |
2130 | { | |
2131 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
2132 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
2133 | } | |
2134 | ||
1da177e4 LT |
2135 | /* |
2136 | * Routines for handling mm_structs | |
2137 | */ | |
2138 | extern struct mm_struct * mm_alloc(void); | |
2139 | ||
2140 | /* mmdrop drops the mm and the page tables */ | |
b3c97528 | 2141 | extern void __mmdrop(struct mm_struct *); |
1da177e4 LT |
2142 | static inline void mmdrop(struct mm_struct * mm) |
2143 | { | |
6fb43d7b | 2144 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
2145 | __mmdrop(mm); |
2146 | } | |
2147 | ||
2148 | /* mmput gets rid of the mappings and all user-space */ | |
2149 | extern void mmput(struct mm_struct *); | |
2150 | /* Grab a reference to a task's mm, if it is not already going away */ | |
2151 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
2152 | /* Remove the current tasks stale references to the old mm_struct */ | |
2153 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
402b0862 CO |
2154 | /* Allocate a new mm structure and copy contents from tsk->mm */ |
2155 | extern struct mm_struct *dup_mm(struct task_struct *tsk); | |
1da177e4 | 2156 | |
6f2c55b8 AD |
2157 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
2158 | struct task_struct *, struct pt_regs *); | |
1da177e4 LT |
2159 | extern void flush_thread(void); |
2160 | extern void exit_thread(void); | |
2161 | ||
1da177e4 | 2162 | extern void exit_files(struct task_struct *); |
a7e5328a | 2163 | extern void __cleanup_sighand(struct sighand_struct *); |
cbaffba1 | 2164 | |
1da177e4 | 2165 | extern void exit_itimers(struct signal_struct *); |
cbaffba1 | 2166 | extern void flush_itimer_signals(void); |
1da177e4 LT |
2167 | |
2168 | extern NORET_TYPE void do_group_exit(int); | |
2169 | ||
1da177e4 LT |
2170 | extern void daemonize(const char *, ...); |
2171 | extern int allow_signal(int); | |
2172 | extern int disallow_signal(int); | |
1da177e4 | 2173 | |
d7627467 DH |
2174 | extern int do_execve(const char *, |
2175 | const char __user * const __user *, | |
2176 | const char __user * const __user *, struct pt_regs *); | |
1da177e4 | 2177 | extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); |
36c8b586 | 2178 | struct task_struct *fork_idle(int); |
1da177e4 LT |
2179 | |
2180 | extern void set_task_comm(struct task_struct *tsk, char *from); | |
59714d65 | 2181 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
2182 | |
2183 | #ifdef CONFIG_SMP | |
85ba2d86 | 2184 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 2185 | #else |
85ba2d86 RM |
2186 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
2187 | long match_state) | |
2188 | { | |
2189 | return 1; | |
2190 | } | |
1da177e4 LT |
2191 | #endif |
2192 | ||
05725f7e JP |
2193 | #define next_task(p) \ |
2194 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
1da177e4 LT |
2195 | |
2196 | #define for_each_process(p) \ | |
2197 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
2198 | ||
5bb459bb | 2199 | extern bool current_is_single_threaded(void); |
d84f4f99 | 2200 | |
1da177e4 LT |
2201 | /* |
2202 | * Careful: do_each_thread/while_each_thread is a double loop so | |
2203 | * 'break' will not work as expected - use goto instead. | |
2204 | */ | |
2205 | #define do_each_thread(g, t) \ | |
2206 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
2207 | ||
2208 | #define while_each_thread(g, t) \ | |
2209 | while ((t = next_thread(t)) != g) | |
2210 | ||
7e49827c ON |
2211 | static inline int get_nr_threads(struct task_struct *tsk) |
2212 | { | |
b3ac022c | 2213 | return tsk->signal->nr_threads; |
7e49827c ON |
2214 | } |
2215 | ||
de12a787 EB |
2216 | /* de_thread depends on thread_group_leader not being a pid based check */ |
2217 | #define thread_group_leader(p) (p == p->group_leader) | |
1da177e4 | 2218 | |
0804ef4b EB |
2219 | /* Do to the insanities of de_thread it is possible for a process |
2220 | * to have the pid of the thread group leader without actually being | |
2221 | * the thread group leader. For iteration through the pids in proc | |
2222 | * all we care about is that we have a task with the appropriate | |
2223 | * pid, we don't actually care if we have the right task. | |
2224 | */ | |
e868171a | 2225 | static inline int has_group_leader_pid(struct task_struct *p) |
0804ef4b EB |
2226 | { |
2227 | return p->pid == p->tgid; | |
2228 | } | |
2229 | ||
bac0abd6 PE |
2230 | static inline |
2231 | int same_thread_group(struct task_struct *p1, struct task_struct *p2) | |
2232 | { | |
2233 | return p1->tgid == p2->tgid; | |
2234 | } | |
2235 | ||
36c8b586 | 2236 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 | 2237 | { |
05725f7e JP |
2238 | return list_entry_rcu(p->thread_group.next, |
2239 | struct task_struct, thread_group); | |
47e65328 ON |
2240 | } |
2241 | ||
e868171a | 2242 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 2243 | { |
47e65328 | 2244 | return list_empty(&p->thread_group); |
1da177e4 LT |
2245 | } |
2246 | ||
2247 | #define delay_group_leader(p) \ | |
2248 | (thread_group_leader(p) && !thread_group_empty(p)) | |
2249 | ||
39c626ae ON |
2250 | static inline int task_detached(struct task_struct *p) |
2251 | { | |
2252 | return p->exit_signal == -1; | |
2253 | } | |
2254 | ||
1da177e4 | 2255 | /* |
260ea101 | 2256 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 2257 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 PM |
2258 | * pins the final release of task.io_context. Also protects ->cpuset and |
2259 | * ->cgroup.subsys[]. | |
1da177e4 LT |
2260 | * |
2261 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
2262 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
2263 | * neither inside nor outside. | |
2264 | */ | |
2265 | static inline void task_lock(struct task_struct *p) | |
2266 | { | |
2267 | spin_lock(&p->alloc_lock); | |
2268 | } | |
2269 | ||
2270 | static inline void task_unlock(struct task_struct *p) | |
2271 | { | |
2272 | spin_unlock(&p->alloc_lock); | |
2273 | } | |
2274 | ||
b8ed374e | 2275 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, |
f63ee72e ON |
2276 | unsigned long *flags); |
2277 | ||
b8ed374e NK |
2278 | #define lock_task_sighand(tsk, flags) \ |
2279 | ({ struct sighand_struct *__ss; \ | |
2280 | __cond_lock(&(tsk)->sighand->siglock, \ | |
2281 | (__ss = __lock_task_sighand(tsk, flags))); \ | |
2282 | __ss; \ | |
2283 | }) \ | |
2284 | ||
f63ee72e ON |
2285 | static inline void unlock_task_sighand(struct task_struct *tsk, |
2286 | unsigned long *flags) | |
2287 | { | |
2288 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
2289 | } | |
2290 | ||
f037360f AV |
2291 | #ifndef __HAVE_THREAD_FUNCTIONS |
2292 | ||
f7e4217b RZ |
2293 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
2294 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 2295 | |
10ebffde AV |
2296 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2297 | { | |
2298 | *task_thread_info(p) = *task_thread_info(org); | |
2299 | task_thread_info(p)->task = p; | |
2300 | } | |
2301 | ||
2302 | static inline unsigned long *end_of_stack(struct task_struct *p) | |
2303 | { | |
f7e4217b | 2304 | return (unsigned long *)(task_thread_info(p) + 1); |
10ebffde AV |
2305 | } |
2306 | ||
f037360f AV |
2307 | #endif |
2308 | ||
8b05c7e6 FT |
2309 | static inline int object_is_on_stack(void *obj) |
2310 | { | |
2311 | void *stack = task_stack_page(current); | |
2312 | ||
2313 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); | |
2314 | } | |
2315 | ||
8c9843e5 BH |
2316 | extern void thread_info_cache_init(void); |
2317 | ||
7c9f8861 ES |
2318 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2319 | static inline unsigned long stack_not_used(struct task_struct *p) | |
2320 | { | |
2321 | unsigned long *n = end_of_stack(p); | |
2322 | ||
2323 | do { /* Skip over canary */ | |
2324 | n++; | |
2325 | } while (!*n); | |
2326 | ||
2327 | return (unsigned long)n - (unsigned long)end_of_stack(p); | |
2328 | } | |
2329 | #endif | |
2330 | ||
1da177e4 LT |
2331 | /* set thread flags in other task's structures |
2332 | * - see asm/thread_info.h for TIF_xxxx flags available | |
2333 | */ | |
2334 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2335 | { | |
a1261f54 | 2336 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2337 | } |
2338 | ||
2339 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2340 | { | |
a1261f54 | 2341 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2342 | } |
2343 | ||
2344 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2345 | { | |
a1261f54 | 2346 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2347 | } |
2348 | ||
2349 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2350 | { | |
a1261f54 | 2351 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2352 | } |
2353 | ||
2354 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2355 | { | |
a1261f54 | 2356 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2357 | } |
2358 | ||
2359 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2360 | { | |
2361 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2362 | } | |
2363 | ||
2364 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2365 | { | |
2366 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2367 | } | |
2368 | ||
8ae121ac GH |
2369 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2370 | { | |
2371 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2372 | } | |
2373 | ||
690cc3ff EB |
2374 | static inline int restart_syscall(void) |
2375 | { | |
2376 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
2377 | return -ERESTARTNOINTR; | |
2378 | } | |
2379 | ||
1da177e4 LT |
2380 | static inline int signal_pending(struct task_struct *p) |
2381 | { | |
2382 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
2383 | } | |
f776d12d | 2384 | |
d9588725 RM |
2385 | static inline int __fatal_signal_pending(struct task_struct *p) |
2386 | { | |
2387 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
2388 | } | |
f776d12d MW |
2389 | |
2390 | static inline int fatal_signal_pending(struct task_struct *p) | |
2391 | { | |
2392 | return signal_pending(p) && __fatal_signal_pending(p); | |
2393 | } | |
2394 | ||
16882c1e ON |
2395 | static inline int signal_pending_state(long state, struct task_struct *p) |
2396 | { | |
2397 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
2398 | return 0; | |
2399 | if (!signal_pending(p)) | |
2400 | return 0; | |
2401 | ||
16882c1e ON |
2402 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2403 | } | |
2404 | ||
1da177e4 LT |
2405 | static inline int need_resched(void) |
2406 | { | |
9404ef02 | 2407 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
1da177e4 LT |
2408 | } |
2409 | ||
2410 | /* | |
2411 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2412 | * explicit rescheduling in places that are safe. The return | |
2413 | * value indicates whether a reschedule was done in fact. | |
2414 | * cond_resched_lock() will drop the spinlock before scheduling, | |
2415 | * cond_resched_softirq() will enable bhs before scheduling. | |
2416 | */ | |
c3921ab7 | 2417 | extern int _cond_resched(void); |
6f80bd98 | 2418 | |
613afbf8 FW |
2419 | #define cond_resched() ({ \ |
2420 | __might_sleep(__FILE__, __LINE__, 0); \ | |
2421 | _cond_resched(); \ | |
2422 | }) | |
6f80bd98 | 2423 | |
613afbf8 FW |
2424 | extern int __cond_resched_lock(spinlock_t *lock); |
2425 | ||
716a4234 FW |
2426 | #ifdef CONFIG_PREEMPT |
2427 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET | |
02b67cc3 | 2428 | #else |
716a4234 | 2429 | #define PREEMPT_LOCK_OFFSET 0 |
02b67cc3 | 2430 | #endif |
716a4234 | 2431 | |
613afbf8 | 2432 | #define cond_resched_lock(lock) ({ \ |
716a4234 | 2433 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ |
613afbf8 FW |
2434 | __cond_resched_lock(lock); \ |
2435 | }) | |
2436 | ||
2437 | extern int __cond_resched_softirq(void); | |
2438 | ||
75e1056f VP |
2439 | #define cond_resched_softirq() ({ \ |
2440 | __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ | |
2441 | __cond_resched_softirq(); \ | |
613afbf8 | 2442 | }) |
1da177e4 LT |
2443 | |
2444 | /* | |
2445 | * Does a critical section need to be broken due to another | |
95c354fe NP |
2446 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2447 | * but a general need for low latency) | |
1da177e4 | 2448 | */ |
95c354fe | 2449 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2450 | { |
95c354fe NP |
2451 | #ifdef CONFIG_PREEMPT |
2452 | return spin_is_contended(lock); | |
2453 | #else | |
1da177e4 | 2454 | return 0; |
95c354fe | 2455 | #endif |
1da177e4 LT |
2456 | } |
2457 | ||
f06febc9 FM |
2458 | /* |
2459 | * Thread group CPU time accounting. | |
2460 | */ | |
4cd4c1b4 | 2461 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
4da94d49 | 2462 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
f06febc9 | 2463 | |
490dea45 | 2464 | static inline void thread_group_cputime_init(struct signal_struct *sig) |
f06febc9 | 2465 | { |
4cd4c1b4 | 2466 | spin_lock_init(&sig->cputimer.lock); |
f06febc9 FM |
2467 | } |
2468 | ||
7bb44ade RM |
2469 | /* |
2470 | * Reevaluate whether the task has signals pending delivery. | |
2471 | * Wake the task if so. | |
2472 | * This is required every time the blocked sigset_t changes. | |
2473 | * callers must hold sighand->siglock. | |
2474 | */ | |
2475 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
2476 | extern void recalc_sigpending(void); |
2477 | ||
2478 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); | |
2479 | ||
2480 | /* | |
2481 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2482 | */ | |
2483 | #ifdef CONFIG_SMP | |
2484 | ||
2485 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2486 | { | |
a1261f54 | 2487 | return task_thread_info(p)->cpu; |
1da177e4 LT |
2488 | } |
2489 | ||
c65cc870 | 2490 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2491 | |
2492 | #else | |
2493 | ||
2494 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2495 | { | |
2496 | return 0; | |
2497 | } | |
2498 | ||
2499 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2500 | { | |
2501 | } | |
2502 | ||
2503 | #endif /* CONFIG_SMP */ | |
2504 | ||
96f874e2 RR |
2505 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2506 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2507 | |
1da177e4 LT |
2508 | extern void normalize_rt_tasks(void); |
2509 | ||
7c941438 | 2510 | #ifdef CONFIG_CGROUP_SCHED |
9b5b7751 | 2511 | |
07e06b01 | 2512 | extern struct task_group root_task_group; |
9b5b7751 | 2513 | |
ec7dc8ac | 2514 | extern struct task_group *sched_create_group(struct task_group *parent); |
4cf86d77 | 2515 | extern void sched_destroy_group(struct task_group *tg); |
9b5b7751 | 2516 | extern void sched_move_task(struct task_struct *tsk); |
052f1dc7 | 2517 | #ifdef CONFIG_FAIR_GROUP_SCHED |
4cf86d77 | 2518 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); |
5cb350ba | 2519 | extern unsigned long sched_group_shares(struct task_group *tg); |
052f1dc7 PZ |
2520 | #endif |
2521 | #ifdef CONFIG_RT_GROUP_SCHED | |
9f0c1e56 PZ |
2522 | extern int sched_group_set_rt_runtime(struct task_group *tg, |
2523 | long rt_runtime_us); | |
2524 | extern long sched_group_rt_runtime(struct task_group *tg); | |
d0b27fa7 PZ |
2525 | extern int sched_group_set_rt_period(struct task_group *tg, |
2526 | long rt_period_us); | |
2527 | extern long sched_group_rt_period(struct task_group *tg); | |
54e99124 | 2528 | extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); |
052f1dc7 | 2529 | #endif |
9b5b7751 SV |
2530 | #endif |
2531 | ||
54e99124 DG |
2532 | extern int task_can_switch_user(struct user_struct *up, |
2533 | struct task_struct *tsk); | |
2534 | ||
4b98d11b AD |
2535 | #ifdef CONFIG_TASK_XACCT |
2536 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2537 | { | |
940389b8 | 2538 | tsk->ioac.rchar += amt; |
4b98d11b AD |
2539 | } |
2540 | ||
2541 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2542 | { | |
940389b8 | 2543 | tsk->ioac.wchar += amt; |
4b98d11b AD |
2544 | } |
2545 | ||
2546 | static inline void inc_syscr(struct task_struct *tsk) | |
2547 | { | |
940389b8 | 2548 | tsk->ioac.syscr++; |
4b98d11b AD |
2549 | } |
2550 | ||
2551 | static inline void inc_syscw(struct task_struct *tsk) | |
2552 | { | |
940389b8 | 2553 | tsk->ioac.syscw++; |
4b98d11b AD |
2554 | } |
2555 | #else | |
2556 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2557 | { | |
2558 | } | |
2559 | ||
2560 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2561 | { | |
2562 | } | |
2563 | ||
2564 | static inline void inc_syscr(struct task_struct *tsk) | |
2565 | { | |
2566 | } | |
2567 | ||
2568 | static inline void inc_syscw(struct task_struct *tsk) | |
2569 | { | |
2570 | } | |
2571 | #endif | |
2572 | ||
82455257 DH |
2573 | #ifndef TASK_SIZE_OF |
2574 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2575 | #endif | |
2576 | ||
0793a61d TG |
2577 | /* |
2578 | * Call the function if the target task is executing on a CPU right now: | |
2579 | */ | |
2580 | extern void task_oncpu_function_call(struct task_struct *p, | |
2581 | void (*func) (void *info), void *info); | |
2582 | ||
2583 | ||
cf475ad2 BS |
2584 | #ifdef CONFIG_MM_OWNER |
2585 | extern void mm_update_next_owner(struct mm_struct *mm); | |
2586 | extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); | |
2587 | #else | |
2588 | static inline void mm_update_next_owner(struct mm_struct *mm) | |
2589 | { | |
2590 | } | |
2591 | ||
2592 | static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) | |
2593 | { | |
2594 | } | |
2595 | #endif /* CONFIG_MM_OWNER */ | |
2596 | ||
3e10e716 JS |
2597 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
2598 | unsigned int limit) | |
2599 | { | |
2600 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); | |
2601 | } | |
2602 | ||
2603 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, | |
2604 | unsigned int limit) | |
2605 | { | |
2606 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); | |
2607 | } | |
2608 | ||
2609 | static inline unsigned long rlimit(unsigned int limit) | |
2610 | { | |
2611 | return task_rlimit(current, limit); | |
2612 | } | |
2613 | ||
2614 | static inline unsigned long rlimit_max(unsigned int limit) | |
2615 | { | |
2616 | return task_rlimit_max(current, limit); | |
2617 | } | |
2618 | ||
1da177e4 LT |
2619 | #endif /* __KERNEL__ */ |
2620 | ||
2621 | #endif |