Commit | Line | Data |
---|---|---|
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> | |
5ad4e53b | 73 | #include <linux/path.h> |
1da177e4 LT |
74 | #include <linux/compiler.h> |
75 | #include <linux/completion.h> | |
76 | #include <linux/pid.h> | |
77 | #include <linux/percpu.h> | |
78 | #include <linux/topology.h> | |
3e26c149 | 79 | #include <linux/proportions.h> |
1da177e4 | 80 | #include <linux/seccomp.h> |
e56d0903 | 81 | #include <linux/rcupdate.h> |
05725f7e | 82 | #include <linux/rculist.h> |
23f78d4a | 83 | #include <linux/rtmutex.h> |
1da177e4 | 84 | |
a3b6714e DW |
85 | #include <linux/time.h> |
86 | #include <linux/param.h> | |
87 | #include <linux/resource.h> | |
88 | #include <linux/timer.h> | |
89 | #include <linux/hrtimer.h> | |
7c3ab738 | 90 | #include <linux/task_io_accounting.h> |
5cb350ba | 91 | #include <linux/kobject.h> |
9745512c | 92 | #include <linux/latencytop.h> |
9e2b2dc4 | 93 | #include <linux/cred.h> |
a3b6714e DW |
94 | |
95 | #include <asm/processor.h> | |
36d57ac4 | 96 | |
1da177e4 | 97 | struct exec_domain; |
c87e2837 | 98 | struct futex_pi_state; |
286100a6 | 99 | struct robust_list_head; |
d89d8796 | 100 | struct bio; |
5ad4e53b | 101 | struct fs_struct; |
e2b371f0 | 102 | struct bts_context; |
cdd6c482 | 103 | struct perf_event_context; |
1da177e4 | 104 | |
1da177e4 LT |
105 | /* |
106 | * List of flags we want to share for kernel threads, | |
107 | * if only because they are not used by them anyway. | |
108 | */ | |
109 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) | |
110 | ||
111 | /* | |
112 | * These are the constant used to fake the fixed-point load-average | |
113 | * counting. Some notes: | |
114 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
115 | * a load-average precision of 10 bits integer + 11 bits fractional | |
116 | * - if you want to count load-averages more often, you need more | |
117 | * precision, or rounding will get you. With 2-second counting freq, | |
118 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
119 | * 11 bit fractions. | |
120 | */ | |
121 | extern unsigned long avenrun[]; /* Load averages */ | |
2d02494f | 122 | extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); |
1da177e4 LT |
123 | |
124 | #define FSHIFT 11 /* nr of bits of precision */ | |
125 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 126 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
127 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
128 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
129 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
130 | ||
131 | #define CALC_LOAD(load,exp,n) \ | |
132 | load *= exp; \ | |
133 | load += n*(FIXED_1-exp); \ | |
134 | load >>= FSHIFT; | |
135 | ||
136 | extern unsigned long total_forks; | |
137 | extern int nr_threads; | |
1da177e4 LT |
138 | DECLARE_PER_CPU(unsigned long, process_counts); |
139 | extern int nr_processes(void); | |
140 | extern unsigned long nr_running(void); | |
141 | extern unsigned long nr_uninterruptible(void); | |
142 | extern unsigned long nr_iowait(void); | |
69d25870 AV |
143 | extern unsigned long nr_iowait_cpu(void); |
144 | extern unsigned long this_cpu_load(void); | |
145 | ||
146 | ||
dce48a84 | 147 | extern void calc_global_load(void); |
23a185ca | 148 | extern u64 cpu_nr_migrations(int cpu); |
1da177e4 | 149 | |
7e49fcce SR |
150 | extern unsigned long get_parent_ip(unsigned long addr); |
151 | ||
43ae34cb IM |
152 | struct seq_file; |
153 | struct cfs_rq; | |
4cf86d77 | 154 | struct task_group; |
43ae34cb IM |
155 | #ifdef CONFIG_SCHED_DEBUG |
156 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
157 | extern void proc_sched_set_task(struct task_struct *p); | |
158 | extern void | |
5cef9eca | 159 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
43ae34cb IM |
160 | #else |
161 | static inline void | |
162 | proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
163 | { | |
164 | } | |
165 | static inline void proc_sched_set_task(struct task_struct *p) | |
166 | { | |
167 | } | |
168 | static inline void | |
5cef9eca | 169 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
43ae34cb IM |
170 | { |
171 | } | |
172 | #endif | |
1da177e4 | 173 | |
690229a0 IM |
174 | extern unsigned long long time_sync_thresh; |
175 | ||
4a8342d2 LT |
176 | /* |
177 | * Task state bitmask. NOTE! These bits are also | |
178 | * encoded in fs/proc/array.c: get_task_state(). | |
179 | * | |
180 | * We have two separate sets of flags: task->state | |
181 | * is about runnability, while task->exit_state are | |
182 | * about the task exiting. Confusing, but this way | |
183 | * modifying one set can't modify the other one by | |
184 | * mistake. | |
185 | */ | |
1da177e4 LT |
186 | #define TASK_RUNNING 0 |
187 | #define TASK_INTERRUPTIBLE 1 | |
188 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
189 | #define __TASK_STOPPED 4 |
190 | #define __TASK_TRACED 8 | |
4a8342d2 LT |
191 | /* in tsk->exit_state */ |
192 | #define EXIT_ZOMBIE 16 | |
193 | #define EXIT_DEAD 32 | |
194 | /* in tsk->state again */ | |
af927232 | 195 | #define TASK_DEAD 64 |
f021a3c2 | 196 | #define TASK_WAKEKILL 128 |
e9c84311 | 197 | #define TASK_WAKING 256 |
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) | |
92a1f4bc | 215 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 216 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 217 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 218 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
6301cb95 | 219 | (task->flags & PF_FREEZING) == 0) |
1da177e4 LT |
220 | |
221 | #define __set_task_state(tsk, state_value) \ | |
222 | do { (tsk)->state = (state_value); } while (0) | |
223 | #define set_task_state(tsk, state_value) \ | |
224 | set_mb((tsk)->state, (state_value)) | |
225 | ||
498d0c57 AM |
226 | /* |
227 | * set_current_state() includes a barrier so that the write of current->state | |
228 | * is correctly serialised wrt the caller's subsequent test of whether to | |
229 | * actually sleep: | |
230 | * | |
231 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
232 | * if (do_i_need_to_sleep()) | |
233 | * schedule(); | |
234 | * | |
235 | * If the caller does not need such serialisation then use __set_current_state() | |
236 | */ | |
1da177e4 LT |
237 | #define __set_current_state(state_value) \ |
238 | do { current->state = (state_value); } while (0) | |
239 | #define set_current_state(state_value) \ | |
240 | set_mb(current->state, (state_value)) | |
241 | ||
242 | /* Task command name length */ | |
243 | #define TASK_COMM_LEN 16 | |
244 | ||
1da177e4 LT |
245 | #include <linux/spinlock.h> |
246 | ||
247 | /* | |
248 | * This serializes "schedule()" and also protects | |
249 | * the run-queue from deletions/modifications (but | |
250 | * _adding_ to the beginning of the run-queue has | |
251 | * a separate lock). | |
252 | */ | |
253 | extern rwlock_t tasklist_lock; | |
254 | extern spinlock_t mmlist_lock; | |
255 | ||
36c8b586 | 256 | struct task_struct; |
1da177e4 LT |
257 | |
258 | extern void sched_init(void); | |
259 | extern void sched_init_smp(void); | |
2d07b255 | 260 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
36c8b586 | 261 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 262 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 | 263 | |
89f19f04 | 264 | extern int runqueue_is_locked(int cpu); |
ad474cac | 265 | extern void task_rq_unlock_wait(struct task_struct *p); |
017730c1 | 266 | |
6a7b3dc3 | 267 | extern cpumask_var_t nohz_cpu_mask; |
46cb4b7c SS |
268 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) |
269 | extern int select_nohz_load_balancer(int cpu); | |
eea08f32 | 270 | extern int get_nohz_load_balancer(void); |
46cb4b7c SS |
271 | #else |
272 | static inline int select_nohz_load_balancer(int cpu) | |
273 | { | |
274 | return 0; | |
275 | } | |
276 | #endif | |
1da177e4 | 277 | |
e59e2ae2 | 278 | /* |
39bc89fd | 279 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
280 | */ |
281 | extern void show_state_filter(unsigned long state_filter); | |
282 | ||
283 | static inline void show_state(void) | |
284 | { | |
39bc89fd | 285 | show_state_filter(0); |
e59e2ae2 IM |
286 | } |
287 | ||
1da177e4 LT |
288 | extern void show_regs(struct pt_regs *); |
289 | ||
290 | /* | |
291 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
292 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
293 | * trace (or NULL if the entire call-chain of the task should be shown). | |
294 | */ | |
295 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
296 | ||
297 | void io_schedule(void); | |
298 | long io_schedule_timeout(long timeout); | |
299 | ||
300 | extern void cpu_init (void); | |
301 | extern void trap_init(void); | |
302 | extern void update_process_times(int user); | |
303 | extern void scheduler_tick(void); | |
304 | ||
82a1fcb9 IM |
305 | extern void sched_show_task(struct task_struct *p); |
306 | ||
8446f1d3 | 307 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
6687a97d | 308 | extern void softlockup_tick(void); |
8446f1d3 | 309 | extern void touch_softlockup_watchdog(void); |
04c9167f | 310 | extern void touch_all_softlockup_watchdogs(void); |
baf48f65 MSB |
311 | extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write, |
312 | struct file *filp, void __user *buffer, | |
313 | size_t *lenp, loff_t *ppos); | |
9c44bc03 | 314 | extern unsigned int softlockup_panic; |
9383d967 | 315 | extern int softlockup_thresh; |
8446f1d3 | 316 | #else |
6687a97d | 317 | static inline void softlockup_tick(void) |
8446f1d3 IM |
318 | { |
319 | } | |
8446f1d3 IM |
320 | static inline void touch_softlockup_watchdog(void) |
321 | { | |
322 | } | |
04c9167f JF |
323 | static inline void touch_all_softlockup_watchdogs(void) |
324 | { | |
325 | } | |
8446f1d3 IM |
326 | #endif |
327 | ||
e162b39a MSB |
328 | #ifdef CONFIG_DETECT_HUNG_TASK |
329 | extern unsigned int sysctl_hung_task_panic; | |
330 | extern unsigned long sysctl_hung_task_check_count; | |
331 | extern unsigned long sysctl_hung_task_timeout_secs; | |
332 | extern unsigned long sysctl_hung_task_warnings; | |
333 | extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, | |
334 | struct file *filp, void __user *buffer, | |
335 | size_t *lenp, loff_t *ppos); | |
336 | #endif | |
8446f1d3 | 337 | |
1da177e4 LT |
338 | /* Attach to any functions which should be ignored in wchan output. */ |
339 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
340 | |
341 | /* Linker adds these: start and end of __sched functions */ | |
342 | extern char __sched_text_start[], __sched_text_end[]; | |
343 | ||
1da177e4 LT |
344 | /* Is this address in the __sched functions? */ |
345 | extern int in_sched_functions(unsigned long addr); | |
346 | ||
347 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
b3c97528 | 348 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 349 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 350 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 351 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
41719b03 | 352 | asmlinkage void __schedule(void); |
1da177e4 | 353 | asmlinkage void schedule(void); |
0d66bf6d | 354 | extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner); |
1da177e4 | 355 | |
ab516013 | 356 | struct nsproxy; |
acce292c | 357 | struct user_namespace; |
1da177e4 | 358 | |
341c87bf KH |
359 | /* |
360 | * Default maximum number of active map areas, this limits the number of vmas | |
361 | * per mm struct. Users can overwrite this number by sysctl but there is a | |
362 | * problem. | |
363 | * | |
364 | * When a program's coredump is generated as ELF format, a section is created | |
365 | * per a vma. In ELF, the number of sections is represented in unsigned short. | |
366 | * This means the number of sections should be smaller than 65535 at coredump. | |
367 | * Because the kernel adds some informative sections to a image of program at | |
368 | * generating coredump, we need some margin. The number of extra sections is | |
369 | * 1-3 now and depends on arch. We use "5" as safe margin, here. | |
370 | */ | |
371 | #define MAPCOUNT_ELF_CORE_MARGIN (5) | |
372 | #define DEFAULT_MAX_MAP_COUNT (USHORT_MAX - MAPCOUNT_ELF_CORE_MARGIN) | |
1da177e4 LT |
373 | |
374 | extern int sysctl_max_map_count; | |
375 | ||
376 | #include <linux/aio.h> | |
377 | ||
378 | extern unsigned long | |
379 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
380 | unsigned long, unsigned long); | |
381 | extern unsigned long | |
382 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
383 | unsigned long len, unsigned long pgoff, | |
384 | unsigned long flags); | |
1363c3cd WW |
385 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
386 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); | |
1da177e4 | 387 | |
f7d0b926 | 388 | #if USE_SPLIT_PTLOCKS |
f412ac08 HD |
389 | /* |
390 | * The mm counters are not protected by its page_table_lock, | |
391 | * so must be incremented atomically. | |
392 | */ | |
d3cb4871 CL |
393 | #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) |
394 | #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) | |
395 | #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) | |
396 | #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) | |
397 | #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) | |
f412ac08 | 398 | |
f7d0b926 | 399 | #else /* !USE_SPLIT_PTLOCKS */ |
f412ac08 HD |
400 | /* |
401 | * The mm counters are protected by its page_table_lock, | |
402 | * so can be incremented directly. | |
403 | */ | |
1da177e4 LT |
404 | #define set_mm_counter(mm, member, value) (mm)->_##member = (value) |
405 | #define get_mm_counter(mm, member) ((mm)->_##member) | |
406 | #define add_mm_counter(mm, member, value) (mm)->_##member += (value) | |
407 | #define inc_mm_counter(mm, member) (mm)->_##member++ | |
408 | #define dec_mm_counter(mm, member) (mm)->_##member-- | |
f412ac08 | 409 | |
f7d0b926 | 410 | #endif /* !USE_SPLIT_PTLOCKS */ |
4294621f | 411 | |
f412ac08 HD |
412 | #define get_mm_rss(mm) \ |
413 | (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) | |
365e9c87 HD |
414 | #define update_hiwater_rss(mm) do { \ |
415 | unsigned long _rss = get_mm_rss(mm); \ | |
416 | if ((mm)->hiwater_rss < _rss) \ | |
417 | (mm)->hiwater_rss = _rss; \ | |
418 | } while (0) | |
419 | #define update_hiwater_vm(mm) do { \ | |
420 | if ((mm)->hiwater_vm < (mm)->total_vm) \ | |
421 | (mm)->hiwater_vm = (mm)->total_vm; \ | |
422 | } while (0) | |
423 | ||
9de1581e ON |
424 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) |
425 | { | |
426 | return max(mm->hiwater_rss, get_mm_rss(mm)); | |
427 | } | |
428 | ||
429 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) | |
430 | { | |
431 | return max(mm->hiwater_vm, mm->total_vm); | |
432 | } | |
901608d9 | 433 | |
6c5d5238 KH |
434 | extern void set_dumpable(struct mm_struct *mm, int value); |
435 | extern int get_dumpable(struct mm_struct *mm); | |
436 | ||
437 | /* mm flags */ | |
3cb4a0bb | 438 | /* dumpable bits */ |
6c5d5238 KH |
439 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
440 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ | |
f8af4da3 | 441 | |
3cb4a0bb | 442 | #define MMF_DUMPABLE_BITS 2 |
f8af4da3 | 443 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
3cb4a0bb KH |
444 | |
445 | /* coredump filter bits */ | |
446 | #define MMF_DUMP_ANON_PRIVATE 2 | |
447 | #define MMF_DUMP_ANON_SHARED 3 | |
448 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
449 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 450 | #define MMF_DUMP_ELF_HEADERS 6 |
e575f111 KM |
451 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
452 | #define MMF_DUMP_HUGETLB_SHARED 8 | |
f8af4da3 | 453 | |
3cb4a0bb | 454 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
e575f111 | 455 | #define MMF_DUMP_FILTER_BITS 7 |
3cb4a0bb KH |
456 | #define MMF_DUMP_FILTER_MASK \ |
457 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
458 | #define MMF_DUMP_FILTER_DEFAULT \ | |
e575f111 | 459 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
656eb2cd RM |
460 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
461 | ||
462 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS | |
463 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) | |
464 | #else | |
465 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 | |
466 | #endif | |
f8af4da3 HD |
467 | /* leave room for more dump flags */ |
468 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ | |
469 | ||
470 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) | |
6c5d5238 | 471 | |
1da177e4 LT |
472 | struct sighand_struct { |
473 | atomic_t count; | |
474 | struct k_sigaction action[_NSIG]; | |
475 | spinlock_t siglock; | |
b8fceee1 | 476 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
477 | }; |
478 | ||
0e464814 | 479 | struct pacct_struct { |
f6ec29a4 KK |
480 | int ac_flag; |
481 | long ac_exitcode; | |
0e464814 | 482 | unsigned long ac_mem; |
77787bfb KK |
483 | cputime_t ac_utime, ac_stime; |
484 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
485 | }; |
486 | ||
f06febc9 FM |
487 | /** |
488 | * struct task_cputime - collected CPU time counts | |
489 | * @utime: time spent in user mode, in &cputime_t units | |
490 | * @stime: time spent in kernel mode, in &cputime_t units | |
491 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds | |
5ce73a4a | 492 | * |
f06febc9 FM |
493 | * This structure groups together three kinds of CPU time that are |
494 | * tracked for threads and thread groups. Most things considering | |
495 | * CPU time want to group these counts together and treat all three | |
496 | * of them in parallel. | |
497 | */ | |
498 | struct task_cputime { | |
499 | cputime_t utime; | |
500 | cputime_t stime; | |
501 | unsigned long long sum_exec_runtime; | |
502 | }; | |
503 | /* Alternate field names when used to cache expirations. */ | |
504 | #define prof_exp stime | |
505 | #define virt_exp utime | |
506 | #define sched_exp sum_exec_runtime | |
507 | ||
4cd4c1b4 PZ |
508 | #define INIT_CPUTIME \ |
509 | (struct task_cputime) { \ | |
510 | .utime = cputime_zero, \ | |
511 | .stime = cputime_zero, \ | |
512 | .sum_exec_runtime = 0, \ | |
513 | } | |
514 | ||
c99e6efe PZ |
515 | /* |
516 | * Disable preemption until the scheduler is running. | |
517 | * Reset by start_kernel()->sched_init()->init_idle(). | |
d86ee480 PZ |
518 | * |
519 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working | |
520 | * before the scheduler is active -- see should_resched(). | |
c99e6efe | 521 | */ |
d86ee480 | 522 | #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) |
c99e6efe | 523 | |
f06febc9 | 524 | /** |
4cd4c1b4 PZ |
525 | * struct thread_group_cputimer - thread group interval timer counts |
526 | * @cputime: thread group interval timers. | |
527 | * @running: non-zero when there are timers running and | |
528 | * @cputime receives updates. | |
529 | * @lock: lock for fields in this struct. | |
f06febc9 FM |
530 | * |
531 | * This structure contains the version of task_cputime, above, that is | |
4cd4c1b4 | 532 | * used for thread group CPU timer calculations. |
f06febc9 | 533 | */ |
4cd4c1b4 PZ |
534 | struct thread_group_cputimer { |
535 | struct task_cputime cputime; | |
536 | int running; | |
537 | spinlock_t lock; | |
f06febc9 | 538 | }; |
f06febc9 | 539 | |
1da177e4 LT |
540 | /* |
541 | * NOTE! "signal_struct" does not have it's own | |
542 | * locking, because a shared signal_struct always | |
543 | * implies a shared sighand_struct, so locking | |
544 | * sighand_struct is always a proper superset of | |
545 | * the locking of signal_struct. | |
546 | */ | |
547 | struct signal_struct { | |
548 | atomic_t count; | |
549 | atomic_t live; | |
550 | ||
551 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
552 | ||
553 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 554 | struct task_struct *curr_target; |
1da177e4 LT |
555 | |
556 | /* shared signal handling: */ | |
557 | struct sigpending shared_pending; | |
558 | ||
559 | /* thread group exit support */ | |
560 | int group_exit_code; | |
561 | /* overloaded: | |
562 | * - notify group_exit_task when ->count is equal to notify_count | |
563 | * - everyone except group_exit_task is stopped during signal delivery | |
564 | * of fatal signals, group_exit_task processes the signal. | |
565 | */ | |
1da177e4 | 566 | int notify_count; |
07dd20e0 | 567 | struct task_struct *group_exit_task; |
1da177e4 LT |
568 | |
569 | /* thread group stop support, overloads group_exit_code too */ | |
570 | int group_stop_count; | |
571 | unsigned int flags; /* see SIGNAL_* flags below */ | |
572 | ||
573 | /* POSIX.1b Interval Timers */ | |
574 | struct list_head posix_timers; | |
575 | ||
576 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 577 | struct hrtimer real_timer; |
fea9d175 | 578 | struct pid *leader_pid; |
2ff678b8 | 579 | ktime_t it_real_incr; |
1da177e4 LT |
580 | |
581 | /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ | |
582 | cputime_t it_prof_expires, it_virt_expires; | |
583 | cputime_t it_prof_incr, it_virt_incr; | |
584 | ||
f06febc9 | 585 | /* |
4cd4c1b4 PZ |
586 | * Thread group totals for process CPU timers. |
587 | * See thread_group_cputimer(), et al, for details. | |
f06febc9 | 588 | */ |
4cd4c1b4 | 589 | struct thread_group_cputimer cputimer; |
f06febc9 FM |
590 | |
591 | /* Earliest-expiration cache. */ | |
592 | struct task_cputime cputime_expires; | |
593 | ||
594 | struct list_head cpu_timers[3]; | |
595 | ||
ab521dc0 | 596 | struct pid *tty_old_pgrp; |
1ec320af | 597 | |
1da177e4 LT |
598 | /* boolean value for session group leader */ |
599 | int leader; | |
600 | ||
601 | struct tty_struct *tty; /* NULL if no tty */ | |
602 | ||
603 | /* | |
604 | * Cumulative resource counters for dead threads in the group, | |
605 | * and for reaped dead child processes forked by this group. | |
606 | * Live threads maintain their own counters and add to these | |
607 | * in __exit_signal, except for the group leader. | |
608 | */ | |
32bd671d | 609 | cputime_t utime, stime, cutime, cstime; |
9ac52315 LV |
610 | cputime_t gtime; |
611 | cputime_t cgtime; | |
1da177e4 LT |
612 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
613 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 614 | unsigned long inblock, oublock, cinblock, coublock; |
940389b8 | 615 | struct task_io_accounting ioac; |
1da177e4 | 616 | |
32bd671d PZ |
617 | /* |
618 | * Cumulative ns of schedule CPU time fo dead threads in the | |
619 | * group, not including a zombie group leader, (This only differs | |
620 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
621 | * other than jiffies.) | |
622 | */ | |
623 | unsigned long long sum_sched_runtime; | |
624 | ||
1da177e4 LT |
625 | /* |
626 | * We don't bother to synchronize most readers of this at all, | |
627 | * because there is no reader checking a limit that actually needs | |
628 | * to get both rlim_cur and rlim_max atomically, and either one | |
629 | * alone is a single word that can safely be read normally. | |
630 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
631 | * protect this instead of the siglock, because they really | |
632 | * have no need to disable irqs. | |
633 | */ | |
634 | struct rlimit rlim[RLIM_NLIMITS]; | |
635 | ||
0e464814 KK |
636 | #ifdef CONFIG_BSD_PROCESS_ACCT |
637 | struct pacct_struct pacct; /* per-process accounting information */ | |
638 | #endif | |
ad4ecbcb | 639 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
640 | struct taskstats *stats; |
641 | #endif | |
522ed776 MT |
642 | #ifdef CONFIG_AUDIT |
643 | unsigned audit_tty; | |
644 | struct tty_audit_buf *tty_audit_buf; | |
645 | #endif | |
28b83c51 KM |
646 | |
647 | int oom_adj; /* OOM kill score adjustment (bit shift) */ | |
1da177e4 LT |
648 | }; |
649 | ||
4866cde0 NP |
650 | /* Context switch must be unlocked if interrupts are to be enabled */ |
651 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW | |
652 | # define __ARCH_WANT_UNLOCKED_CTXSW | |
653 | #endif | |
654 | ||
1da177e4 LT |
655 | /* |
656 | * Bits in flags field of signal_struct. | |
657 | */ | |
658 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
659 | #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ | |
660 | #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ | |
661 | #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ | |
e4420551 ON |
662 | /* |
663 | * Pending notifications to parent. | |
664 | */ | |
665 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
666 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
667 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
1da177e4 | 668 | |
fae5fa44 ON |
669 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
670 | ||
ed5d2cac ON |
671 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
672 | static inline int signal_group_exit(const struct signal_struct *sig) | |
673 | { | |
674 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
675 | (sig->group_exit_task != NULL); | |
676 | } | |
677 | ||
1da177e4 LT |
678 | /* |
679 | * Some day this will be a full-fledged user tracking system.. | |
680 | */ | |
681 | struct user_struct { | |
682 | atomic_t __count; /* reference count */ | |
683 | atomic_t processes; /* How many processes does this user have? */ | |
684 | atomic_t files; /* How many open files does this user have? */ | |
685 | atomic_t sigpending; /* How many pending signals does this user have? */ | |
2d9048e2 | 686 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
687 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
688 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
689 | #endif | |
7ef9964e | 690 | #ifdef CONFIG_EPOLL |
7ef9964e DL |
691 | atomic_t epoll_watches; /* The number of file descriptors currently watched */ |
692 | #endif | |
970a8645 | 693 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
694 | /* protected by mq_lock */ |
695 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 696 | #endif |
1da177e4 LT |
697 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
698 | ||
699 | #ifdef CONFIG_KEYS | |
700 | struct key *uid_keyring; /* UID specific keyring */ | |
701 | struct key *session_keyring; /* UID's default session keyring */ | |
702 | #endif | |
703 | ||
704 | /* Hash table maintenance information */ | |
735de223 | 705 | struct hlist_node uidhash_node; |
1da177e4 | 706 | uid_t uid; |
18b6e041 | 707 | struct user_namespace *user_ns; |
24e377a8 | 708 | |
052f1dc7 | 709 | #ifdef CONFIG_USER_SCHED |
4cf86d77 | 710 | struct task_group *tg; |
b1a8c172 | 711 | #ifdef CONFIG_SYSFS |
eb41d946 | 712 | struct kobject kobj; |
3959214f | 713 | struct delayed_work work; |
24e377a8 | 714 | #endif |
b1a8c172 | 715 | #endif |
789f90fc | 716 | |
cdd6c482 | 717 | #ifdef CONFIG_PERF_EVENTS |
789f90fc PZ |
718 | atomic_long_t locked_vm; |
719 | #endif | |
1da177e4 LT |
720 | }; |
721 | ||
eb41d946 | 722 | extern int uids_sysfs_init(void); |
5cb350ba | 723 | |
1da177e4 LT |
724 | extern struct user_struct *find_user(uid_t); |
725 | ||
726 | extern struct user_struct root_user; | |
727 | #define INIT_USER (&root_user) | |
728 | ||
b6dff3ec | 729 | |
1da177e4 LT |
730 | struct backing_dev_info; |
731 | struct reclaim_state; | |
732 | ||
52f17b6c | 733 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
734 | struct sched_info { |
735 | /* cumulative counters */ | |
2d72376b | 736 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 737 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
738 | |
739 | /* timestamps */ | |
172ba844 BS |
740 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
741 | last_queued; /* when we were last queued to run */ | |
b8efb561 IM |
742 | #ifdef CONFIG_SCHEDSTATS |
743 | /* BKL stats */ | |
480b9434 | 744 | unsigned int bkl_count; |
b8efb561 | 745 | #endif |
1da177e4 | 746 | }; |
52f17b6c | 747 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 748 | |
ca74e92b SN |
749 | #ifdef CONFIG_TASK_DELAY_ACCT |
750 | struct task_delay_info { | |
751 | spinlock_t lock; | |
752 | unsigned int flags; /* Private per-task flags */ | |
753 | ||
754 | /* For each stat XXX, add following, aligned appropriately | |
755 | * | |
756 | * struct timespec XXX_start, XXX_end; | |
757 | * u64 XXX_delay; | |
758 | * u32 XXX_count; | |
759 | * | |
760 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
761 | * single lock above (split into XXX_lock if contention is an issue). | |
762 | */ | |
0ff92245 SN |
763 | |
764 | /* | |
765 | * XXX_count is incremented on every XXX operation, the delay | |
766 | * associated with the operation is added to XXX_delay. | |
767 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
768 | */ | |
769 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ | |
770 | u64 blkio_delay; /* wait for sync block io completion */ | |
771 | u64 swapin_delay; /* wait for swapin block io completion */ | |
772 | u32 blkio_count; /* total count of the number of sync block */ | |
773 | /* io operations performed */ | |
774 | u32 swapin_count; /* total count of the number of swapin block */ | |
775 | /* io operations performed */ | |
873b4771 KK |
776 | |
777 | struct timespec freepages_start, freepages_end; | |
778 | u64 freepages_delay; /* wait for memory reclaim */ | |
779 | u32 freepages_count; /* total count of memory reclaim */ | |
ca74e92b | 780 | }; |
52f17b6c CS |
781 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
782 | ||
783 | static inline int sched_info_on(void) | |
784 | { | |
785 | #ifdef CONFIG_SCHEDSTATS | |
786 | return 1; | |
787 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
788 | extern int delayacct_on; | |
789 | return delayacct_on; | |
790 | #else | |
791 | return 0; | |
ca74e92b | 792 | #endif |
52f17b6c | 793 | } |
ca74e92b | 794 | |
d15bcfdb IM |
795 | enum cpu_idle_type { |
796 | CPU_IDLE, | |
797 | CPU_NOT_IDLE, | |
798 | CPU_NEWLY_IDLE, | |
799 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
800 | }; |
801 | ||
802 | /* | |
803 | * sched-domains (multiprocessor balancing) declarations: | |
804 | */ | |
9aa7b369 IM |
805 | |
806 | /* | |
807 | * Increase resolution of nice-level calculations: | |
808 | */ | |
809 | #define SCHED_LOAD_SHIFT 10 | |
810 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) | |
811 | ||
f8700df7 | 812 | #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE |
1da177e4 | 813 | |
2dd73a4f | 814 | #ifdef CONFIG_SMP |
b5d978e0 PZ |
815 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
816 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ | |
817 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ | |
818 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ | |
c88d5910 | 819 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
b5d978e0 | 820 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
59abf026 | 821 | #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */ |
b5d978e0 PZ |
822 | #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ |
823 | #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */ | |
824 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ | |
825 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ | |
c88d5910 | 826 | |
b5d978e0 | 827 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
5c45bf27 | 828 | |
afb8a9b7 GS |
829 | enum powersavings_balance_level { |
830 | POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ | |
831 | POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package | |
832 | * first for long running threads | |
833 | */ | |
834 | POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle | |
835 | * cpu package for power savings | |
836 | */ | |
837 | MAX_POWERSAVINGS_BALANCE_LEVELS | |
838 | }; | |
89c4710e | 839 | |
716707b2 | 840 | extern int sched_mc_power_savings, sched_smt_power_savings; |
89c4710e | 841 | |
716707b2 VS |
842 | static inline int sd_balance_for_mc_power(void) |
843 | { | |
844 | if (sched_smt_power_savings) | |
845 | return SD_POWERSAVINGS_BALANCE; | |
5c45bf27 | 846 | |
b5d978e0 | 847 | return SD_PREFER_SIBLING; |
716707b2 | 848 | } |
89c4710e | 849 | |
716707b2 VS |
850 | static inline int sd_balance_for_package_power(void) |
851 | { | |
852 | if (sched_mc_power_savings | sched_smt_power_savings) | |
853 | return SD_POWERSAVINGS_BALANCE; | |
854 | ||
b5d978e0 | 855 | return SD_PREFER_SIBLING; |
716707b2 | 856 | } |
5c45bf27 | 857 | |
100fdaee VS |
858 | /* |
859 | * Optimise SD flags for power savings: | |
860 | * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings. | |
861 | * Keep default SD flags if sched_{smt,mc}_power_saving=0 | |
862 | */ | |
863 | ||
864 | static inline int sd_power_saving_flags(void) | |
865 | { | |
866 | if (sched_mc_power_savings | sched_smt_power_savings) | |
867 | return SD_BALANCE_NEWIDLE; | |
868 | ||
869 | return 0; | |
870 | } | |
1da177e4 LT |
871 | |
872 | struct sched_group { | |
873 | struct sched_group *next; /* Must be a circular list */ | |
1da177e4 LT |
874 | |
875 | /* | |
876 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a | |
18a3885f | 877 | * single CPU. |
5517d86b | 878 | */ |
18a3885f | 879 | unsigned int cpu_power; |
6c99e9ad | 880 | |
4200efd9 IM |
881 | /* |
882 | * The CPUs this group covers. | |
883 | * | |
884 | * NOTE: this field is variable length. (Allocated dynamically | |
885 | * by attaching extra space to the end of the structure, | |
886 | * depending on how many CPUs the kernel has booted up with) | |
887 | * | |
888 | * It is also be embedded into static data structures at build | |
889 | * time. (See 'struct static_sched_group' in kernel/sched.c) | |
890 | */ | |
891 | unsigned long cpumask[0]; | |
1da177e4 LT |
892 | }; |
893 | ||
758b2cdc RR |
894 | static inline struct cpumask *sched_group_cpus(struct sched_group *sg) |
895 | { | |
6c99e9ad | 896 | return to_cpumask(sg->cpumask); |
758b2cdc RR |
897 | } |
898 | ||
1d3504fc HS |
899 | enum sched_domain_level { |
900 | SD_LV_NONE = 0, | |
901 | SD_LV_SIBLING, | |
902 | SD_LV_MC, | |
903 | SD_LV_CPU, | |
904 | SD_LV_NODE, | |
905 | SD_LV_ALLNODES, | |
906 | SD_LV_MAX | |
907 | }; | |
908 | ||
909 | struct sched_domain_attr { | |
910 | int relax_domain_level; | |
911 | }; | |
912 | ||
913 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ | |
914 | .relax_domain_level = -1, \ | |
915 | } | |
916 | ||
1da177e4 LT |
917 | struct sched_domain { |
918 | /* These fields must be setup */ | |
919 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 920 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 | 921 | struct sched_group *groups; /* the balancing groups of the domain */ |
1da177e4 LT |
922 | unsigned long min_interval; /* Minimum balance interval ms */ |
923 | unsigned long max_interval; /* Maximum balance interval ms */ | |
924 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
925 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 926 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
927 | unsigned int busy_idx; |
928 | unsigned int idle_idx; | |
929 | unsigned int newidle_idx; | |
930 | unsigned int wake_idx; | |
147cbb4b | 931 | unsigned int forkexec_idx; |
a52bfd73 | 932 | unsigned int smt_gain; |
1da177e4 | 933 | int flags; /* See SD_* */ |
1d3504fc | 934 | enum sched_domain_level level; |
1da177e4 LT |
935 | |
936 | /* Runtime fields. */ | |
937 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
938 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
939 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
940 | ||
2398f2c6 PZ |
941 | u64 last_update; |
942 | ||
1da177e4 LT |
943 | #ifdef CONFIG_SCHEDSTATS |
944 | /* load_balance() stats */ | |
480b9434 KC |
945 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
946 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; | |
947 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; | |
948 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; | |
949 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; | |
950 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; | |
951 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; | |
952 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; | |
1da177e4 LT |
953 | |
954 | /* Active load balancing */ | |
480b9434 KC |
955 | unsigned int alb_count; |
956 | unsigned int alb_failed; | |
957 | unsigned int alb_pushed; | |
1da177e4 | 958 | |
68767a0a | 959 | /* SD_BALANCE_EXEC stats */ |
480b9434 KC |
960 | unsigned int sbe_count; |
961 | unsigned int sbe_balanced; | |
962 | unsigned int sbe_pushed; | |
1da177e4 | 963 | |
68767a0a | 964 | /* SD_BALANCE_FORK stats */ |
480b9434 KC |
965 | unsigned int sbf_count; |
966 | unsigned int sbf_balanced; | |
967 | unsigned int sbf_pushed; | |
68767a0a | 968 | |
1da177e4 | 969 | /* try_to_wake_up() stats */ |
480b9434 KC |
970 | unsigned int ttwu_wake_remote; |
971 | unsigned int ttwu_move_affine; | |
972 | unsigned int ttwu_move_balance; | |
1da177e4 | 973 | #endif |
a5d8c348 IM |
974 | #ifdef CONFIG_SCHED_DEBUG |
975 | char *name; | |
976 | #endif | |
6c99e9ad | 977 | |
4200efd9 IM |
978 | /* |
979 | * Span of all CPUs in this domain. | |
980 | * | |
981 | * NOTE: this field is variable length. (Allocated dynamically | |
982 | * by attaching extra space to the end of the structure, | |
983 | * depending on how many CPUs the kernel has booted up with) | |
984 | * | |
985 | * It is also be embedded into static data structures at build | |
986 | * time. (See 'struct static_sched_domain' in kernel/sched.c) | |
987 | */ | |
988 | unsigned long span[0]; | |
1da177e4 LT |
989 | }; |
990 | ||
758b2cdc RR |
991 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
992 | { | |
6c99e9ad | 993 | return to_cpumask(sd->span); |
758b2cdc RR |
994 | } |
995 | ||
96f874e2 | 996 | extern void partition_sched_domains(int ndoms_new, struct cpumask *doms_new, |
1d3504fc | 997 | struct sched_domain_attr *dattr_new); |
029190c5 | 998 | |
06aaf76a IM |
999 | /* Test a flag in parent sched domain */ |
1000 | static inline int test_sd_parent(struct sched_domain *sd, int flag) | |
1001 | { | |
1002 | if (sd->parent && (sd->parent->flags & flag)) | |
1003 | return 1; | |
1004 | ||
1005 | return 0; | |
1006 | } | |
029190c5 | 1007 | |
47fe38fc PZ |
1008 | unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); |
1009 | unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); | |
1010 | ||
1b427c15 | 1011 | #else /* CONFIG_SMP */ |
1da177e4 | 1012 | |
1b427c15 | 1013 | struct sched_domain_attr; |
d02c7a8c | 1014 | |
1b427c15 | 1015 | static inline void |
96f874e2 | 1016 | partition_sched_domains(int ndoms_new, struct cpumask *doms_new, |
1b427c15 IM |
1017 | struct sched_domain_attr *dattr_new) |
1018 | { | |
d02c7a8c | 1019 | } |
1b427c15 | 1020 | #endif /* !CONFIG_SMP */ |
1da177e4 | 1021 | |
47fe38fc | 1022 | |
1da177e4 | 1023 | struct io_context; /* See blkdev.h */ |
1da177e4 | 1024 | |
1da177e4 | 1025 | |
383f2835 | 1026 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 1027 | extern void prefetch_stack(struct task_struct *t); |
383f2835 CK |
1028 | #else |
1029 | static inline void prefetch_stack(struct task_struct *t) { } | |
1030 | #endif | |
1da177e4 LT |
1031 | |
1032 | struct audit_context; /* See audit.c */ | |
1033 | struct mempolicy; | |
b92ce558 | 1034 | struct pipe_inode_info; |
4865ecf1 | 1035 | struct uts_namespace; |
1da177e4 | 1036 | |
20b8a59f IM |
1037 | struct rq; |
1038 | struct sched_domain; | |
1039 | ||
7d478721 PZ |
1040 | /* |
1041 | * wake flags | |
1042 | */ | |
1043 | #define WF_SYNC 0x01 /* waker goes to sleep after wakup */ | |
a7558e01 | 1044 | #define WF_FORK 0x02 /* child wakeup after fork */ |
7d478721 | 1045 | |
20b8a59f | 1046 | struct sched_class { |
5522d5d5 | 1047 | const struct sched_class *next; |
20b8a59f | 1048 | |
fd390f6a | 1049 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); |
f02231e5 | 1050 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); |
4530d7ab | 1051 | void (*yield_task) (struct rq *rq); |
20b8a59f | 1052 | |
7d478721 | 1053 | void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); |
20b8a59f | 1054 | |
fb8d4724 | 1055 | struct task_struct * (*pick_next_task) (struct rq *rq); |
31ee529c | 1056 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
20b8a59f | 1057 | |
681f3e68 | 1058 | #ifdef CONFIG_SMP |
7d478721 | 1059 | int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags); |
4ce72a2c | 1060 | |
43010659 | 1061 | unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, |
e1d1484f | 1062 | struct rq *busiest, unsigned long max_load_move, |
20b8a59f | 1063 | struct sched_domain *sd, enum cpu_idle_type idle, |
a4ac01c3 | 1064 | int *all_pinned, int *this_best_prio); |
20b8a59f | 1065 | |
e1d1484f PW |
1066 | int (*move_one_task) (struct rq *this_rq, int this_cpu, |
1067 | struct rq *busiest, struct sched_domain *sd, | |
1068 | enum cpu_idle_type idle); | |
9a897c5a SR |
1069 | void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); |
1070 | void (*post_schedule) (struct rq *this_rq); | |
1071 | void (*task_wake_up) (struct rq *this_rq, struct task_struct *task); | |
e1d1484f | 1072 | |
cd8ba7cd | 1073 | void (*set_cpus_allowed)(struct task_struct *p, |
96f874e2 | 1074 | const struct cpumask *newmask); |
57d885fe | 1075 | |
1f11eb6a GH |
1076 | void (*rq_online)(struct rq *rq); |
1077 | void (*rq_offline)(struct rq *rq); | |
4ce72a2c LZ |
1078 | #endif |
1079 | ||
1080 | void (*set_curr_task) (struct rq *rq); | |
1081 | void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); | |
1082 | void (*task_new) (struct rq *rq, struct task_struct *p); | |
cb469845 SR |
1083 | |
1084 | void (*switched_from) (struct rq *this_rq, struct task_struct *task, | |
1085 | int running); | |
1086 | void (*switched_to) (struct rq *this_rq, struct task_struct *task, | |
1087 | int running); | |
1088 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, | |
1089 | int oldprio, int running); | |
810b3817 | 1090 | |
0d721cea PW |
1091 | unsigned int (*get_rr_interval) (struct task_struct *task); |
1092 | ||
810b3817 PZ |
1093 | #ifdef CONFIG_FAIR_GROUP_SCHED |
1094 | void (*moved_group) (struct task_struct *p); | |
1095 | #endif | |
20b8a59f IM |
1096 | }; |
1097 | ||
1098 | struct load_weight { | |
1099 | unsigned long weight, inv_weight; | |
1100 | }; | |
1101 | ||
1102 | /* | |
1103 | * CFS stats for a schedulable entity (task, task-group etc) | |
1104 | * | |
1105 | * Current field usage histogram: | |
1106 | * | |
1107 | * 4 se->block_start | |
1108 | * 4 se->run_node | |
1109 | * 4 se->sleep_start | |
20b8a59f | 1110 | * 6 se->load.weight |
20b8a59f IM |
1111 | */ |
1112 | struct sched_entity { | |
20b8a59f IM |
1113 | struct load_weight load; /* for load-balancing */ |
1114 | struct rb_node run_node; | |
4a55bd5e | 1115 | struct list_head group_node; |
20b8a59f IM |
1116 | unsigned int on_rq; |
1117 | ||
94c18227 IM |
1118 | u64 exec_start; |
1119 | u64 sum_exec_runtime; | |
e9acbff6 | 1120 | u64 vruntime; |
f6cf891c | 1121 | u64 prev_sum_exec_runtime; |
94c18227 | 1122 | |
4ae7d5ce IM |
1123 | u64 last_wakeup; |
1124 | u64 avg_overlap; | |
1125 | ||
6c594c21 IM |
1126 | u64 nr_migrations; |
1127 | ||
34cb6135 IM |
1128 | u64 start_runtime; |
1129 | u64 avg_wakeup; | |
34cb6135 | 1130 | |
ad4b78bb PZ |
1131 | u64 avg_running; |
1132 | ||
94c18227 | 1133 | #ifdef CONFIG_SCHEDSTATS |
20b8a59f | 1134 | u64 wait_start; |
94c18227 | 1135 | u64 wait_max; |
6d082592 AV |
1136 | u64 wait_count; |
1137 | u64 wait_sum; | |
8f0dfc34 AV |
1138 | u64 iowait_count; |
1139 | u64 iowait_sum; | |
94c18227 | 1140 | |
20b8a59f | 1141 | u64 sleep_start; |
20b8a59f | 1142 | u64 sleep_max; |
94c18227 IM |
1143 | s64 sum_sleep_runtime; |
1144 | ||
1145 | u64 block_start; | |
20b8a59f IM |
1146 | u64 block_max; |
1147 | u64 exec_max; | |
eba1ed4b | 1148 | u64 slice_max; |
cc367732 | 1149 | |
cc367732 IM |
1150 | u64 nr_migrations_cold; |
1151 | u64 nr_failed_migrations_affine; | |
1152 | u64 nr_failed_migrations_running; | |
1153 | u64 nr_failed_migrations_hot; | |
1154 | u64 nr_forced_migrations; | |
1155 | u64 nr_forced2_migrations; | |
1156 | ||
1157 | u64 nr_wakeups; | |
1158 | u64 nr_wakeups_sync; | |
1159 | u64 nr_wakeups_migrate; | |
1160 | u64 nr_wakeups_local; | |
1161 | u64 nr_wakeups_remote; | |
1162 | u64 nr_wakeups_affine; | |
1163 | u64 nr_wakeups_affine_attempts; | |
1164 | u64 nr_wakeups_passive; | |
1165 | u64 nr_wakeups_idle; | |
94c18227 IM |
1166 | #endif |
1167 | ||
20b8a59f IM |
1168 | #ifdef CONFIG_FAIR_GROUP_SCHED |
1169 | struct sched_entity *parent; | |
1170 | /* rq on which this entity is (to be) queued: */ | |
1171 | struct cfs_rq *cfs_rq; | |
1172 | /* rq "owned" by this entity/group: */ | |
1173 | struct cfs_rq *my_q; | |
1174 | #endif | |
1175 | }; | |
70b97a7f | 1176 | |
fa717060 PZ |
1177 | struct sched_rt_entity { |
1178 | struct list_head run_list; | |
78f2c7db | 1179 | unsigned long timeout; |
bee367ed | 1180 | unsigned int time_slice; |
6f505b16 PZ |
1181 | int nr_cpus_allowed; |
1182 | ||
58d6c2d7 | 1183 | struct sched_rt_entity *back; |
052f1dc7 | 1184 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
1185 | struct sched_rt_entity *parent; |
1186 | /* rq on which this entity is (to be) queued: */ | |
1187 | struct rt_rq *rt_rq; | |
1188 | /* rq "owned" by this entity/group: */ | |
1189 | struct rt_rq *my_q; | |
1190 | #endif | |
fa717060 PZ |
1191 | }; |
1192 | ||
86848966 PM |
1193 | struct rcu_node; |
1194 | ||
1da177e4 LT |
1195 | struct task_struct { |
1196 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 1197 | void *stack; |
1da177e4 | 1198 | atomic_t usage; |
97dc32cd WC |
1199 | unsigned int flags; /* per process flags, defined below */ |
1200 | unsigned int ptrace; | |
1da177e4 | 1201 | |
36772092 | 1202 | int lock_depth; /* BKL lock depth */ |
1da177e4 | 1203 | |
2dd73a4f PW |
1204 | #ifdef CONFIG_SMP |
1205 | #ifdef __ARCH_WANT_UNLOCKED_CTXSW | |
4866cde0 NP |
1206 | int oncpu; |
1207 | #endif | |
2dd73a4f | 1208 | #endif |
50e645a8 | 1209 | |
b29739f9 | 1210 | int prio, static_prio, normal_prio; |
c7aceaba | 1211 | unsigned int rt_priority; |
5522d5d5 | 1212 | const struct sched_class *sched_class; |
20b8a59f | 1213 | struct sched_entity se; |
fa717060 | 1214 | struct sched_rt_entity rt; |
1da177e4 | 1215 | |
e107be36 AK |
1216 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1217 | /* list of struct preempt_notifier: */ | |
1218 | struct hlist_head preempt_notifiers; | |
1219 | #endif | |
1220 | ||
18796aa0 AD |
1221 | /* |
1222 | * fpu_counter contains the number of consecutive context switches | |
1223 | * that the FPU is used. If this is over a threshold, the lazy fpu | |
1224 | * saving becomes unlazy to save the trap. This is an unsigned char | |
1225 | * so that after 256 times the counter wraps and the behavior turns | |
1226 | * lazy again; this to deal with bursty apps that only use FPU for | |
1227 | * a short time | |
1228 | */ | |
1229 | unsigned char fpu_counter; | |
6c5c9341 | 1230 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 1231 | unsigned int btrace_seq; |
6c5c9341 | 1232 | #endif |
1da177e4 | 1233 | |
97dc32cd | 1234 | unsigned int policy; |
1da177e4 | 1235 | cpumask_t cpus_allowed; |
1da177e4 | 1236 | |
f41d911f | 1237 | #ifdef CONFIG_TREE_PREEMPT_RCU |
e260be67 | 1238 | int rcu_read_lock_nesting; |
f41d911f | 1239 | char rcu_read_unlock_special; |
86848966 | 1240 | struct rcu_node *rcu_blocked_node; |
f41d911f PM |
1241 | struct list_head rcu_node_entry; |
1242 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ | |
e260be67 | 1243 | |
52f17b6c | 1244 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
1245 | struct sched_info sched_info; |
1246 | #endif | |
1247 | ||
1248 | struct list_head tasks; | |
917b627d | 1249 | struct plist_node pushable_tasks; |
1da177e4 LT |
1250 | |
1251 | struct mm_struct *mm, *active_mm; | |
1252 | ||
1253 | /* task state */ | |
1254 | struct linux_binfmt *binfmt; | |
97dc32cd | 1255 | int exit_state; |
1da177e4 LT |
1256 | int exit_code, exit_signal; |
1257 | int pdeath_signal; /* The signal sent when the parent dies */ | |
1258 | /* ??? */ | |
97dc32cd | 1259 | unsigned int personality; |
1da177e4 | 1260 | unsigned did_exec:1; |
f9ce1f1c KT |
1261 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
1262 | * execve */ | |
8f0dfc34 AV |
1263 | unsigned in_iowait:1; |
1264 | ||
ca94c442 LP |
1265 | |
1266 | /* Revert to default priority/policy when forking */ | |
1267 | unsigned sched_reset_on_fork:1; | |
1268 | ||
1da177e4 LT |
1269 | pid_t pid; |
1270 | pid_t tgid; | |
0a425405 | 1271 | |
1314562a | 1272 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
1273 | /* Canary value for the -fstack-protector gcc feature */ |
1274 | unsigned long stack_canary; | |
1314562a | 1275 | #endif |
e0032087 | 1276 | |
1da177e4 LT |
1277 | /* |
1278 | * pointers to (original) parent process, youngest child, younger sibling, | |
1279 | * older sibling, respectively. (p->father can be replaced with | |
f470021a | 1280 | * p->real_parent->pid) |
1da177e4 | 1281 | */ |
f470021a RM |
1282 | struct task_struct *real_parent; /* real parent process */ |
1283 | struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 1284 | /* |
f470021a | 1285 | * children/sibling forms the list of my natural children |
1da177e4 LT |
1286 | */ |
1287 | struct list_head children; /* list of my children */ | |
1288 | struct list_head sibling; /* linkage in my parent's children list */ | |
1289 | struct task_struct *group_leader; /* threadgroup leader */ | |
1290 | ||
f470021a RM |
1291 | /* |
1292 | * ptraced is the list of tasks this task is using ptrace on. | |
1293 | * This includes both natural children and PTRACE_ATTACH targets. | |
1294 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
1295 | */ | |
1296 | struct list_head ptraced; | |
1297 | struct list_head ptrace_entry; | |
1298 | ||
ca0002a1 MM |
1299 | /* |
1300 | * This is the tracer handle for the ptrace BTS extension. | |
1301 | * This field actually belongs to the ptracer task. | |
1302 | */ | |
e2b371f0 | 1303 | struct bts_context *bts; |
ca0002a1 | 1304 | |
1da177e4 | 1305 | /* PID/PID hash table linkage. */ |
92476d7f | 1306 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1307 | struct list_head thread_group; |
1da177e4 LT |
1308 | |
1309 | struct completion *vfork_done; /* for vfork() */ | |
1310 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1311 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1312 | ||
c66f08be | 1313 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1314 | cputime_t gtime; |
9301899b | 1315 | cputime_t prev_utime, prev_stime; |
1da177e4 | 1316 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
924b42d5 TJ |
1317 | struct timespec start_time; /* monotonic time */ |
1318 | struct timespec real_start_time; /* boot based time */ | |
1da177e4 LT |
1319 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1320 | unsigned long min_flt, maj_flt; | |
1321 | ||
f06febc9 | 1322 | struct task_cputime cputime_expires; |
1da177e4 LT |
1323 | struct list_head cpu_timers[3]; |
1324 | ||
1325 | /* process credentials */ | |
3b11a1de DH |
1326 | const struct cred *real_cred; /* objective and real subjective task |
1327 | * credentials (COW) */ | |
1328 | const struct cred *cred; /* effective (overridable) subjective task | |
1329 | * credentials (COW) */ | |
5e751e99 DH |
1330 | struct mutex cred_guard_mutex; /* guard against foreign influences on |
1331 | * credential calculations | |
1332 | * (notably. ptrace) */ | |
ee18d64c | 1333 | struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */ |
b6dff3ec | 1334 | |
36772092 PBG |
1335 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1336 | - access with [gs]et_task_comm (which lock | |
1337 | it with task_lock()) | |
1338 | - initialized normally by flush_old_exec */ | |
1da177e4 LT |
1339 | /* file system info */ |
1340 | int link_count, total_link_count; | |
3d5b6fcc | 1341 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1342 | /* ipc stuff */ |
1343 | struct sysv_sem sysvsem; | |
3d5b6fcc | 1344 | #endif |
e162b39a | 1345 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 1346 | /* hung task detection */ |
82a1fcb9 IM |
1347 | unsigned long last_switch_count; |
1348 | #endif | |
1da177e4 LT |
1349 | /* CPU-specific state of this task */ |
1350 | struct thread_struct thread; | |
1351 | /* filesystem information */ | |
1352 | struct fs_struct *fs; | |
1353 | /* open file information */ | |
1354 | struct files_struct *files; | |
1651e14e | 1355 | /* namespaces */ |
ab516013 | 1356 | struct nsproxy *nsproxy; |
1da177e4 LT |
1357 | /* signal handlers */ |
1358 | struct signal_struct *signal; | |
1359 | struct sighand_struct *sighand; | |
1360 | ||
1361 | sigset_t blocked, real_blocked; | |
f3de272b | 1362 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
1363 | struct sigpending pending; |
1364 | ||
1365 | unsigned long sas_ss_sp; | |
1366 | size_t sas_ss_size; | |
1367 | int (*notifier)(void *priv); | |
1368 | void *notifier_data; | |
1369 | sigset_t *notifier_mask; | |
1da177e4 | 1370 | struct audit_context *audit_context; |
bfef93a5 AV |
1371 | #ifdef CONFIG_AUDITSYSCALL |
1372 | uid_t loginuid; | |
4746ec5b | 1373 | unsigned int sessionid; |
bfef93a5 | 1374 | #endif |
1da177e4 LT |
1375 | seccomp_t seccomp; |
1376 | ||
1377 | /* Thread group tracking */ | |
1378 | u32 parent_exec_id; | |
1379 | u32 self_exec_id; | |
58568d2a MX |
1380 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1381 | * mempolicy */ | |
1da177e4 | 1382 | spinlock_t alloc_lock; |
1da177e4 | 1383 | |
3aa551c9 TG |
1384 | #ifdef CONFIG_GENERIC_HARDIRQS |
1385 | /* IRQ handler threads */ | |
1386 | struct irqaction *irqaction; | |
1387 | #endif | |
1388 | ||
b29739f9 IM |
1389 | /* Protection of the PI data structures: */ |
1390 | spinlock_t pi_lock; | |
1391 | ||
23f78d4a IM |
1392 | #ifdef CONFIG_RT_MUTEXES |
1393 | /* PI waiters blocked on a rt_mutex held by this task */ | |
1394 | struct plist_head pi_waiters; | |
1395 | /* Deadlock detection and priority inheritance handling */ | |
1396 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1397 | #endif |
1398 | ||
408894ee IM |
1399 | #ifdef CONFIG_DEBUG_MUTEXES |
1400 | /* mutex deadlock detection */ | |
1401 | struct mutex_waiter *blocked_on; | |
1402 | #endif | |
de30a2b3 IM |
1403 | #ifdef CONFIG_TRACE_IRQFLAGS |
1404 | unsigned int irq_events; | |
1405 | int hardirqs_enabled; | |
1406 | unsigned long hardirq_enable_ip; | |
1407 | unsigned int hardirq_enable_event; | |
1408 | unsigned long hardirq_disable_ip; | |
1409 | unsigned int hardirq_disable_event; | |
1410 | int softirqs_enabled; | |
1411 | unsigned long softirq_disable_ip; | |
1412 | unsigned int softirq_disable_event; | |
1413 | unsigned long softirq_enable_ip; | |
1414 | unsigned int softirq_enable_event; | |
1415 | int hardirq_context; | |
1416 | int softirq_context; | |
1417 | #endif | |
fbb9ce95 | 1418 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 1419 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
1420 | u64 curr_chain_key; |
1421 | int lockdep_depth; | |
fbb9ce95 | 1422 | unsigned int lockdep_recursion; |
c7aceaba | 1423 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 1424 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 1425 | #endif |
408894ee | 1426 | |
1da177e4 LT |
1427 | /* journalling filesystem info */ |
1428 | void *journal_info; | |
1429 | ||
d89d8796 NB |
1430 | /* stacked block device info */ |
1431 | struct bio *bio_list, **bio_tail; | |
1432 | ||
1da177e4 LT |
1433 | /* VM state */ |
1434 | struct reclaim_state *reclaim_state; | |
1435 | ||
1da177e4 LT |
1436 | struct backing_dev_info *backing_dev_info; |
1437 | ||
1438 | struct io_context *io_context; | |
1439 | ||
1440 | unsigned long ptrace_message; | |
1441 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 1442 | struct task_io_accounting ioac; |
8f0ab514 | 1443 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1444 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1445 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
49b5cf34 | 1446 | cputime_t acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
1447 | #endif |
1448 | #ifdef CONFIG_CPUSETS | |
58568d2a | 1449 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
825a46af | 1450 | int cpuset_mem_spread_rotor; |
1da177e4 | 1451 | #endif |
ddbcc7e8 | 1452 | #ifdef CONFIG_CGROUPS |
817929ec PM |
1453 | /* Control Group info protected by css_set_lock */ |
1454 | struct css_set *cgroups; | |
1455 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ | |
1456 | struct list_head cg_list; | |
ddbcc7e8 | 1457 | #endif |
42b2dd0a | 1458 | #ifdef CONFIG_FUTEX |
0771dfef | 1459 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1460 | #ifdef CONFIG_COMPAT |
1461 | struct compat_robust_list_head __user *compat_robust_list; | |
1462 | #endif | |
c87e2837 IM |
1463 | struct list_head pi_state_list; |
1464 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1465 | #endif |
cdd6c482 IM |
1466 | #ifdef CONFIG_PERF_EVENTS |
1467 | struct perf_event_context *perf_event_ctxp; | |
1468 | struct mutex perf_event_mutex; | |
1469 | struct list_head perf_event_list; | |
a63eaf34 | 1470 | #endif |
c7aceaba | 1471 | #ifdef CONFIG_NUMA |
58568d2a | 1472 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 1473 | short il_next; |
42b2dd0a | 1474 | #endif |
22e2c507 | 1475 | atomic_t fs_excl; /* holding fs exclusive resources */ |
e56d0903 | 1476 | struct rcu_head rcu; |
b92ce558 JA |
1477 | |
1478 | /* | |
1479 | * cache last used pipe for splice | |
1480 | */ | |
1481 | struct pipe_inode_info *splice_pipe; | |
ca74e92b SN |
1482 | #ifdef CONFIG_TASK_DELAY_ACCT |
1483 | struct task_delay_info *delays; | |
f4f154fd AM |
1484 | #endif |
1485 | #ifdef CONFIG_FAULT_INJECTION | |
1486 | int make_it_fail; | |
ca74e92b | 1487 | #endif |
3e26c149 | 1488 | struct prop_local_single dirties; |
9745512c AV |
1489 | #ifdef CONFIG_LATENCYTOP |
1490 | int latency_record_count; | |
1491 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1492 | #endif | |
6976675d AV |
1493 | /* |
1494 | * time slack values; these are used to round up poll() and | |
1495 | * select() etc timeout values. These are in nanoseconds. | |
1496 | */ | |
1497 | unsigned long timer_slack_ns; | |
1498 | unsigned long default_timer_slack_ns; | |
f8d570a4 DM |
1499 | |
1500 | struct list_head *scm_work_list; | |
fb52607a | 1501 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
f201ae23 FW |
1502 | /* Index of current stored adress in ret_stack */ |
1503 | int curr_ret_stack; | |
1504 | /* Stack of return addresses for return function tracing */ | |
1505 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
1506 | /* time stamp for last schedule */ |
1507 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
1508 | /* |
1509 | * Number of functions that haven't been traced | |
1510 | * because of depth overrun. | |
1511 | */ | |
1512 | atomic_t trace_overrun; | |
380c4b14 FW |
1513 | /* Pause for the tracing */ |
1514 | atomic_t tracing_graph_pause; | |
f201ae23 | 1515 | #endif |
ea4e2bc4 SR |
1516 | #ifdef CONFIG_TRACING |
1517 | /* state flags for use by tracers */ | |
1518 | unsigned long trace; | |
261842b7 SR |
1519 | /* bitmask of trace recursion */ |
1520 | unsigned long trace_recursion; | |
1521 | #endif /* CONFIG_TRACING */ | |
1da177e4 LT |
1522 | }; |
1523 | ||
76e6eee0 RR |
1524 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
1525 | #define tsk_cpumask(tsk) (&(tsk)->cpus_allowed) | |
1526 | ||
e05606d3 IM |
1527 | /* |
1528 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT | |
1529 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH | |
1530 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority | |
1531 | * values are inverted: lower p->prio value means higher priority. | |
1532 | * | |
1533 | * The MAX_USER_RT_PRIO value allows the actual maximum | |
1534 | * RT priority to be separate from the value exported to | |
1535 | * user-space. This allows kernel threads to set their | |
1536 | * priority to a value higher than any user task. Note: | |
1537 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. | |
1538 | */ | |
1539 | ||
1540 | #define MAX_USER_RT_PRIO 100 | |
1541 | #define MAX_RT_PRIO MAX_USER_RT_PRIO | |
1542 | ||
1543 | #define MAX_PRIO (MAX_RT_PRIO + 40) | |
1544 | #define DEFAULT_PRIO (MAX_RT_PRIO + 20) | |
1545 | ||
1546 | static inline int rt_prio(int prio) | |
1547 | { | |
1548 | if (unlikely(prio < MAX_RT_PRIO)) | |
1549 | return 1; | |
1550 | return 0; | |
1551 | } | |
1552 | ||
e868171a | 1553 | static inline int rt_task(struct task_struct *p) |
e05606d3 IM |
1554 | { |
1555 | return rt_prio(p->prio); | |
1556 | } | |
1557 | ||
e868171a | 1558 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1559 | { |
1560 | return task->pids[PIDTYPE_PID].pid; | |
1561 | } | |
1562 | ||
e868171a | 1563 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1564 | { |
1565 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1566 | } | |
1567 | ||
6dda81f4 ON |
1568 | /* |
1569 | * Without tasklist or rcu lock it is not safe to dereference | |
1570 | * the result of task_pgrp/task_session even if task == current, | |
1571 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1572 | */ | |
e868171a | 1573 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1574 | { |
1575 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1576 | } | |
1577 | ||
e868171a | 1578 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1579 | { |
1580 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1581 | } | |
1582 | ||
7af57294 PE |
1583 | struct pid_namespace; |
1584 | ||
1585 | /* | |
1586 | * the helpers to get the task's different pids as they are seen | |
1587 | * from various namespaces | |
1588 | * | |
1589 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1590 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1591 | * current. | |
7af57294 PE |
1592 | * task_xid_nr_ns() : id seen from the ns specified; |
1593 | * | |
1594 | * set_task_vxid() : assigns a virtual id to a task; | |
1595 | * | |
7af57294 PE |
1596 | * see also pid_nr() etc in include/linux/pid.h |
1597 | */ | |
52ee2dfd ON |
1598 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1599 | struct pid_namespace *ns); | |
7af57294 | 1600 | |
e868171a | 1601 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1602 | { |
1603 | return tsk->pid; | |
1604 | } | |
1605 | ||
52ee2dfd ON |
1606 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1607 | struct pid_namespace *ns) | |
1608 | { | |
1609 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1610 | } | |
7af57294 PE |
1611 | |
1612 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1613 | { | |
52ee2dfd | 1614 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1615 | } |
1616 | ||
1617 | ||
e868171a | 1618 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1619 | { |
1620 | return tsk->tgid; | |
1621 | } | |
1622 | ||
2f2a3a46 | 1623 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1624 | |
1625 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1626 | { | |
1627 | return pid_vnr(task_tgid(tsk)); | |
1628 | } | |
1629 | ||
1630 | ||
52ee2dfd ON |
1631 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1632 | struct pid_namespace *ns) | |
7af57294 | 1633 | { |
52ee2dfd | 1634 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1635 | } |
1636 | ||
7af57294 PE |
1637 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1638 | { | |
52ee2dfd | 1639 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1640 | } |
1641 | ||
1642 | ||
52ee2dfd ON |
1643 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1644 | struct pid_namespace *ns) | |
7af57294 | 1645 | { |
52ee2dfd | 1646 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1647 | } |
1648 | ||
7af57294 PE |
1649 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1650 | { | |
52ee2dfd | 1651 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1652 | } |
1653 | ||
1b0f7ffd ON |
1654 | /* obsolete, do not use */ |
1655 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1656 | { | |
1657 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1658 | } | |
7af57294 | 1659 | |
1da177e4 LT |
1660 | /** |
1661 | * pid_alive - check that a task structure is not stale | |
1662 | * @p: Task structure to be checked. | |
1663 | * | |
1664 | * Test if a process is not yet dead (at most zombie state) | |
1665 | * If pid_alive fails, then pointers within the task structure | |
1666 | * can be stale and must not be dereferenced. | |
1667 | */ | |
e868171a | 1668 | static inline int pid_alive(struct task_struct *p) |
1da177e4 | 1669 | { |
92476d7f | 1670 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1671 | } |
1672 | ||
f400e198 | 1673 | /** |
b460cbc5 | 1674 | * is_global_init - check if a task structure is init |
3260259f H |
1675 | * @tsk: Task structure to be checked. |
1676 | * | |
1677 | * Check if a task structure is the first user space task the kernel created. | |
b460cbc5 | 1678 | */ |
e868171a | 1679 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
1680 | { |
1681 | return tsk->pid == 1; | |
1682 | } | |
b460cbc5 SH |
1683 | |
1684 | /* | |
1685 | * is_container_init: | |
1686 | * check whether in the task is init in its own pid namespace. | |
f400e198 | 1687 | */ |
b461cc03 | 1688 | extern int is_container_init(struct task_struct *tsk); |
f400e198 | 1689 | |
9ec52099 CLG |
1690 | extern struct pid *cad_pid; |
1691 | ||
1da177e4 | 1692 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1693 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1694 | |
158d9ebd | 1695 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1696 | |
1697 | static inline void put_task_struct(struct task_struct *t) | |
1698 | { | |
1699 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1700 | __put_task_struct(t); |
e56d0903 | 1701 | } |
1da177e4 | 1702 | |
49048622 BS |
1703 | extern cputime_t task_utime(struct task_struct *p); |
1704 | extern cputime_t task_stime(struct task_struct *p); | |
1705 | extern cputime_t task_gtime(struct task_struct *p); | |
1706 | ||
1da177e4 LT |
1707 | /* |
1708 | * Per process flags | |
1709 | */ | |
1710 | #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ | |
1711 | /* Not implemented yet, only for 486*/ | |
1712 | #define PF_STARTING 0x00000002 /* being created */ | |
1713 | #define PF_EXITING 0x00000004 /* getting shut down */ | |
778e9a9c | 1714 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1715 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
1da177e4 LT |
1716 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
1717 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ | |
1718 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1719 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1720 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
1721 | #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ | |
1722 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ | |
6301cb95 | 1723 | #define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */ |
1da177e4 LT |
1724 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1725 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1726 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1727 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
35451bee | 1728 | #define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */ |
1da177e4 | 1729 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 1730 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
1731 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
1732 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
1733 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ | |
1734 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ | |
9985b0ba | 1735 | #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ |
c61afb18 | 1736 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
61a87122 | 1737 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
ba96a0c8 | 1738 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ |
ebb12db5 | 1739 | #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ |
1da177e4 LT |
1740 | |
1741 | /* | |
1742 | * Only the _current_ task can read/write to tsk->flags, but other | |
1743 | * tasks can access tsk->flags in readonly mode for example | |
1744 | * with tsk_used_math (like during threaded core dumping). | |
1745 | * There is however an exception to this rule during ptrace | |
1746 | * or during fork: the ptracer task is allowed to write to the | |
1747 | * child->flags of its traced child (same goes for fork, the parent | |
1748 | * can write to the child->flags), because we're guaranteed the | |
1749 | * child is not running and in turn not changing child->flags | |
1750 | * at the same time the parent does it. | |
1751 | */ | |
1752 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1753 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1754 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1755 | #define set_used_math() set_stopped_child_used_math(current) | |
1756 | #define conditional_stopped_child_used_math(condition, child) \ | |
1757 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1758 | #define conditional_used_math(condition) \ | |
1759 | conditional_stopped_child_used_math(condition, current) | |
1760 | #define copy_to_stopped_child_used_math(child) \ | |
1761 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1762 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1763 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1764 | #define used_math() tsk_used_math(current) | |
1765 | ||
f41d911f PM |
1766 | #ifdef CONFIG_TREE_PREEMPT_RCU |
1767 | ||
1768 | #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ | |
1769 | #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ | |
f41d911f PM |
1770 | |
1771 | static inline void rcu_copy_process(struct task_struct *p) | |
1772 | { | |
1773 | p->rcu_read_lock_nesting = 0; | |
1774 | p->rcu_read_unlock_special = 0; | |
dd5d19ba | 1775 | p->rcu_blocked_node = NULL; |
f41d911f PM |
1776 | INIT_LIST_HEAD(&p->rcu_node_entry); |
1777 | } | |
1778 | ||
f41d911f PM |
1779 | #else |
1780 | ||
1781 | static inline void rcu_copy_process(struct task_struct *p) | |
1782 | { | |
1783 | } | |
1784 | ||
1785 | #endif | |
1786 | ||
1da177e4 | 1787 | #ifdef CONFIG_SMP |
cd8ba7cd | 1788 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1789 | const struct cpumask *new_mask); |
1da177e4 | 1790 | #else |
cd8ba7cd | 1791 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1792 | const struct cpumask *new_mask) |
1da177e4 | 1793 | { |
96f874e2 | 1794 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1795 | return -EINVAL; |
1796 | return 0; | |
1797 | } | |
1798 | #endif | |
cd8ba7cd MT |
1799 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
1800 | { | |
1801 | return set_cpus_allowed_ptr(p, &new_mask); | |
1802 | } | |
1da177e4 | 1803 | |
b342501c IM |
1804 | /* |
1805 | * Architectures can set this to 1 if they have specified | |
1806 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, | |
1807 | * but then during bootup it turns out that sched_clock() | |
1808 | * is reliable after all: | |
1809 | */ | |
1810 | #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK | |
1811 | extern int sched_clock_stable; | |
1812 | #endif | |
1813 | ||
1da177e4 | 1814 | extern unsigned long long sched_clock(void); |
e436d800 | 1815 | |
c1955a3d PZ |
1816 | extern void sched_clock_init(void); |
1817 | extern u64 sched_clock_cpu(int cpu); | |
3e51f33f | 1818 | |
c1955a3d | 1819 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
3e51f33f PZ |
1820 | static inline void sched_clock_tick(void) |
1821 | { | |
1822 | } | |
1823 | ||
1824 | static inline void sched_clock_idle_sleep_event(void) | |
1825 | { | |
1826 | } | |
1827 | ||
1828 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) | |
1829 | { | |
1830 | } | |
1831 | #else | |
3e51f33f PZ |
1832 | extern void sched_clock_tick(void); |
1833 | extern void sched_clock_idle_sleep_event(void); | |
1834 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
1835 | #endif | |
1836 | ||
e436d800 IM |
1837 | /* |
1838 | * For kernel-internal use: high-speed (but slightly incorrect) per-cpu | |
1839 | * clock constructed from sched_clock(): | |
1840 | */ | |
1841 | extern unsigned long long cpu_clock(int cpu); | |
1842 | ||
36c8b586 | 1843 | extern unsigned long long |
41b86e9c | 1844 | task_sched_runtime(struct task_struct *task); |
f06febc9 | 1845 | extern unsigned long long thread_group_sched_runtime(struct task_struct *task); |
1da177e4 LT |
1846 | |
1847 | /* sched_exec is called by processes performing an exec */ | |
1848 | #ifdef CONFIG_SMP | |
1849 | extern void sched_exec(void); | |
1850 | #else | |
1851 | #define sched_exec() {} | |
1852 | #endif | |
1853 | ||
2aa44d05 IM |
1854 | extern void sched_clock_idle_sleep_event(void); |
1855 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 1856 | |
1da177e4 LT |
1857 | #ifdef CONFIG_HOTPLUG_CPU |
1858 | extern void idle_task_exit(void); | |
1859 | #else | |
1860 | static inline void idle_task_exit(void) {} | |
1861 | #endif | |
1862 | ||
1863 | extern void sched_idle_next(void); | |
b29739f9 | 1864 | |
06d8308c TG |
1865 | #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) |
1866 | extern void wake_up_idle_cpu(int cpu); | |
1867 | #else | |
1868 | static inline void wake_up_idle_cpu(int cpu) { } | |
1869 | #endif | |
1870 | ||
21805085 | 1871 | extern unsigned int sysctl_sched_latency; |
b2be5e96 | 1872 | extern unsigned int sysctl_sched_min_granularity; |
bf0f6f24 | 1873 | extern unsigned int sysctl_sched_wakeup_granularity; |
47fea2ad JSR |
1874 | extern unsigned int sysctl_sched_shares_ratelimit; |
1875 | extern unsigned int sysctl_sched_shares_thresh; | |
bf0f6f24 | 1876 | extern unsigned int sysctl_sched_child_runs_first; |
2bba22c5 | 1877 | #ifdef CONFIG_SCHED_DEBUG |
bf0f6f24 | 1878 | extern unsigned int sysctl_sched_features; |
da84d961 | 1879 | extern unsigned int sysctl_sched_migration_cost; |
b82d9fdd | 1880 | extern unsigned int sysctl_sched_nr_migrate; |
e9e9250b | 1881 | extern unsigned int sysctl_sched_time_avg; |
cd1bb94b | 1882 | extern unsigned int sysctl_timer_migration; |
b2be5e96 PZ |
1883 | |
1884 | int sched_nr_latency_handler(struct ctl_table *table, int write, | |
1885 | struct file *file, void __user *buffer, size_t *length, | |
1886 | loff_t *ppos); | |
2bd8e6d4 | 1887 | #endif |
eea08f32 AB |
1888 | #ifdef CONFIG_SCHED_DEBUG |
1889 | static inline unsigned int get_sysctl_timer_migration(void) | |
1890 | { | |
1891 | return sysctl_timer_migration; | |
1892 | } | |
1893 | #else | |
1894 | static inline unsigned int get_sysctl_timer_migration(void) | |
1895 | { | |
1896 | return 1; | |
1897 | } | |
1898 | #endif | |
9f0c1e56 PZ |
1899 | extern unsigned int sysctl_sched_rt_period; |
1900 | extern int sysctl_sched_rt_runtime; | |
2bd8e6d4 | 1901 | |
d0b27fa7 PZ |
1902 | int sched_rt_handler(struct ctl_table *table, int write, |
1903 | struct file *filp, void __user *buffer, size_t *lenp, | |
1904 | loff_t *ppos); | |
1905 | ||
2bd8e6d4 | 1906 | extern unsigned int sysctl_sched_compat_yield; |
bf0f6f24 | 1907 | |
b29739f9 | 1908 | #ifdef CONFIG_RT_MUTEXES |
36c8b586 IM |
1909 | extern int rt_mutex_getprio(struct task_struct *p); |
1910 | extern void rt_mutex_setprio(struct task_struct *p, int prio); | |
1911 | extern void rt_mutex_adjust_pi(struct task_struct *p); | |
b29739f9 | 1912 | #else |
e868171a | 1913 | static inline int rt_mutex_getprio(struct task_struct *p) |
b29739f9 IM |
1914 | { |
1915 | return p->normal_prio; | |
1916 | } | |
95e02ca9 | 1917 | # define rt_mutex_adjust_pi(p) do { } while (0) |
b29739f9 IM |
1918 | #endif |
1919 | ||
36c8b586 IM |
1920 | extern void set_user_nice(struct task_struct *p, long nice); |
1921 | extern int task_prio(const struct task_struct *p); | |
1922 | extern int task_nice(const struct task_struct *p); | |
1923 | extern int can_nice(const struct task_struct *p, const int nice); | |
1924 | extern int task_curr(const struct task_struct *p); | |
1da177e4 LT |
1925 | extern int idle_cpu(int cpu); |
1926 | extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); | |
961ccddd RR |
1927 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
1928 | struct sched_param *); | |
36c8b586 IM |
1929 | extern struct task_struct *idle_task(int cpu); |
1930 | extern struct task_struct *curr_task(int cpu); | |
1931 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
1932 | |
1933 | void yield(void); | |
1934 | ||
1935 | /* | |
1936 | * The default (Linux) execution domain. | |
1937 | */ | |
1938 | extern struct exec_domain default_exec_domain; | |
1939 | ||
1940 | union thread_union { | |
1941 | struct thread_info thread_info; | |
1942 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
1943 | }; | |
1944 | ||
1945 | #ifndef __HAVE_ARCH_KSTACK_END | |
1946 | static inline int kstack_end(void *addr) | |
1947 | { | |
1948 | /* Reliable end of stack detection: | |
1949 | * Some APM bios versions misalign the stack | |
1950 | */ | |
1951 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
1952 | } | |
1953 | #endif | |
1954 | ||
1955 | extern union thread_union init_thread_union; | |
1956 | extern struct task_struct init_task; | |
1957 | ||
1958 | extern struct mm_struct init_mm; | |
1959 | ||
198fe21b PE |
1960 | extern struct pid_namespace init_pid_ns; |
1961 | ||
1962 | /* | |
1963 | * find a task by one of its numerical ids | |
1964 | * | |
198fe21b PE |
1965 | * find_task_by_pid_ns(): |
1966 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
1967 | * find_task_by_vpid(): |
1968 | * finds a task by its virtual pid | |
198fe21b | 1969 | * |
e49859e7 | 1970 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
1971 | */ |
1972 | ||
228ebcbe PE |
1973 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
1974 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
1975 | struct pid_namespace *ns); | |
198fe21b | 1976 | |
8520d7c7 | 1977 | extern void __set_special_pids(struct pid *pid); |
1da177e4 LT |
1978 | |
1979 | /* per-UID process charging. */ | |
acce292c | 1980 | extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); |
1da177e4 LT |
1981 | static inline struct user_struct *get_uid(struct user_struct *u) |
1982 | { | |
1983 | atomic_inc(&u->__count); | |
1984 | return u; | |
1985 | } | |
1986 | extern void free_uid(struct user_struct *); | |
28f300d2 | 1987 | extern void release_uids(struct user_namespace *ns); |
1da177e4 LT |
1988 | |
1989 | #include <asm/current.h> | |
1990 | ||
3171a030 | 1991 | extern void do_timer(unsigned long ticks); |
1da177e4 | 1992 | |
b3c97528 HH |
1993 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
1994 | extern int wake_up_process(struct task_struct *tsk); | |
1995 | extern void wake_up_new_task(struct task_struct *tsk, | |
1996 | unsigned long clone_flags); | |
1da177e4 LT |
1997 | #ifdef CONFIG_SMP |
1998 | extern void kick_process(struct task_struct *tsk); | |
1999 | #else | |
2000 | static inline void kick_process(struct task_struct *tsk) { } | |
2001 | #endif | |
ad46c2c4 IM |
2002 | extern void sched_fork(struct task_struct *p, int clone_flags); |
2003 | extern void sched_dead(struct task_struct *p); | |
1da177e4 | 2004 | |
1da177e4 LT |
2005 | extern void proc_caches_init(void); |
2006 | extern void flush_signals(struct task_struct *); | |
3bcac026 | 2007 | extern void __flush_signals(struct task_struct *); |
10ab825b | 2008 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
2009 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
2010 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
2011 | ||
2012 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
2013 | { | |
2014 | unsigned long flags; | |
2015 | int ret; | |
2016 | ||
2017 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
2018 | ret = dequeue_signal(tsk, mask, info); | |
2019 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
2020 | ||
2021 | return ret; | |
2022 | } | |
2023 | ||
2024 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
2025 | sigset_t *mask); | |
2026 | extern void unblock_all_signals(void); | |
2027 | extern void release_task(struct task_struct * p); | |
2028 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1da177e4 LT |
2029 | extern int force_sigsegv(int, struct task_struct *); |
2030 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 | 2031 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
c4b92fc1 | 2032 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
2425c08b | 2033 | extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); |
c4b92fc1 EB |
2034 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
2035 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 2036 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
2b2a1ff6 | 2037 | extern int do_notify_parent(struct task_struct *, int); |
1da177e4 LT |
2038 | extern void force_sig(int, struct task_struct *); |
2039 | extern void force_sig_specific(int, struct task_struct *); | |
2040 | extern int send_sig(int, struct task_struct *, int); | |
2041 | extern void zap_other_threads(struct task_struct *p); | |
1da177e4 LT |
2042 | extern struct sigqueue *sigqueue_alloc(void); |
2043 | extern void sigqueue_free(struct sigqueue *); | |
ac5c2153 | 2044 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
9ac95f2f | 2045 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 LT |
2046 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
2047 | ||
9ec52099 CLG |
2048 | static inline int kill_cad_pid(int sig, int priv) |
2049 | { | |
2050 | return kill_pid(cad_pid, sig, priv); | |
2051 | } | |
2052 | ||
1da177e4 LT |
2053 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
2054 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
2055 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
2056 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
2057 | ||
621d3121 ON |
2058 | static inline int is_si_special(const struct siginfo *info) |
2059 | { | |
2060 | return info <= SEND_SIG_FORCED; | |
2061 | } | |
2062 | ||
1da177e4 LT |
2063 | /* True if we are on the alternate signal stack. */ |
2064 | ||
2065 | static inline int on_sig_stack(unsigned long sp) | |
2066 | { | |
2067 | return (sp - current->sas_ss_sp < current->sas_ss_size); | |
2068 | } | |
2069 | ||
2070 | static inline int sas_ss_flags(unsigned long sp) | |
2071 | { | |
2072 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
2073 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
2074 | } | |
2075 | ||
1da177e4 LT |
2076 | /* |
2077 | * Routines for handling mm_structs | |
2078 | */ | |
2079 | extern struct mm_struct * mm_alloc(void); | |
2080 | ||
2081 | /* mmdrop drops the mm and the page tables */ | |
b3c97528 | 2082 | extern void __mmdrop(struct mm_struct *); |
1da177e4 LT |
2083 | static inline void mmdrop(struct mm_struct * mm) |
2084 | { | |
6fb43d7b | 2085 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
2086 | __mmdrop(mm); |
2087 | } | |
2088 | ||
2089 | /* mmput gets rid of the mappings and all user-space */ | |
2090 | extern void mmput(struct mm_struct *); | |
2091 | /* Grab a reference to a task's mm, if it is not already going away */ | |
2092 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
2093 | /* Remove the current tasks stale references to the old mm_struct */ | |
2094 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
402b0862 CO |
2095 | /* Allocate a new mm structure and copy contents from tsk->mm */ |
2096 | extern struct mm_struct *dup_mm(struct task_struct *tsk); | |
1da177e4 | 2097 | |
6f2c55b8 AD |
2098 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
2099 | struct task_struct *, struct pt_regs *); | |
1da177e4 LT |
2100 | extern void flush_thread(void); |
2101 | extern void exit_thread(void); | |
2102 | ||
1da177e4 | 2103 | extern void exit_files(struct task_struct *); |
6b3934ef | 2104 | extern void __cleanup_signal(struct signal_struct *); |
a7e5328a | 2105 | extern void __cleanup_sighand(struct sighand_struct *); |
cbaffba1 | 2106 | |
1da177e4 | 2107 | extern void exit_itimers(struct signal_struct *); |
cbaffba1 | 2108 | extern void flush_itimer_signals(void); |
1da177e4 LT |
2109 | |
2110 | extern NORET_TYPE void do_group_exit(int); | |
2111 | ||
1da177e4 LT |
2112 | extern void daemonize(const char *, ...); |
2113 | extern int allow_signal(int); | |
2114 | extern int disallow_signal(int); | |
1da177e4 LT |
2115 | |
2116 | extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); | |
2117 | extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); | |
36c8b586 | 2118 | struct task_struct *fork_idle(int); |
1da177e4 LT |
2119 | |
2120 | extern void set_task_comm(struct task_struct *tsk, char *from); | |
59714d65 | 2121 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
2122 | |
2123 | #ifdef CONFIG_SMP | |
a26b89f0 | 2124 | extern void wait_task_context_switch(struct task_struct *p); |
85ba2d86 | 2125 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 2126 | #else |
a26b89f0 | 2127 | static inline void wait_task_context_switch(struct task_struct *p) {} |
85ba2d86 RM |
2128 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
2129 | long match_state) | |
2130 | { | |
2131 | return 1; | |
2132 | } | |
1da177e4 LT |
2133 | #endif |
2134 | ||
05725f7e JP |
2135 | #define next_task(p) \ |
2136 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
1da177e4 LT |
2137 | |
2138 | #define for_each_process(p) \ | |
2139 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
2140 | ||
5bb459bb | 2141 | extern bool current_is_single_threaded(void); |
d84f4f99 | 2142 | |
1da177e4 LT |
2143 | /* |
2144 | * Careful: do_each_thread/while_each_thread is a double loop so | |
2145 | * 'break' will not work as expected - use goto instead. | |
2146 | */ | |
2147 | #define do_each_thread(g, t) \ | |
2148 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
2149 | ||
2150 | #define while_each_thread(g, t) \ | |
2151 | while ((t = next_thread(t)) != g) | |
2152 | ||
de12a787 EB |
2153 | /* de_thread depends on thread_group_leader not being a pid based check */ |
2154 | #define thread_group_leader(p) (p == p->group_leader) | |
1da177e4 | 2155 | |
0804ef4b EB |
2156 | /* Do to the insanities of de_thread it is possible for a process |
2157 | * to have the pid of the thread group leader without actually being | |
2158 | * the thread group leader. For iteration through the pids in proc | |
2159 | * all we care about is that we have a task with the appropriate | |
2160 | * pid, we don't actually care if we have the right task. | |
2161 | */ | |
e868171a | 2162 | static inline int has_group_leader_pid(struct task_struct *p) |
0804ef4b EB |
2163 | { |
2164 | return p->pid == p->tgid; | |
2165 | } | |
2166 | ||
bac0abd6 PE |
2167 | static inline |
2168 | int same_thread_group(struct task_struct *p1, struct task_struct *p2) | |
2169 | { | |
2170 | return p1->tgid == p2->tgid; | |
2171 | } | |
2172 | ||
36c8b586 | 2173 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 | 2174 | { |
05725f7e JP |
2175 | return list_entry_rcu(p->thread_group.next, |
2176 | struct task_struct, thread_group); | |
47e65328 ON |
2177 | } |
2178 | ||
e868171a | 2179 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 2180 | { |
47e65328 | 2181 | return list_empty(&p->thread_group); |
1da177e4 LT |
2182 | } |
2183 | ||
2184 | #define delay_group_leader(p) \ | |
2185 | (thread_group_leader(p) && !thread_group_empty(p)) | |
2186 | ||
39c626ae ON |
2187 | static inline int task_detached(struct task_struct *p) |
2188 | { | |
2189 | return p->exit_signal == -1; | |
2190 | } | |
2191 | ||
1da177e4 | 2192 | /* |
260ea101 | 2193 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 2194 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 PM |
2195 | * pins the final release of task.io_context. Also protects ->cpuset and |
2196 | * ->cgroup.subsys[]. | |
1da177e4 LT |
2197 | * |
2198 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
2199 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
2200 | * neither inside nor outside. | |
2201 | */ | |
2202 | static inline void task_lock(struct task_struct *p) | |
2203 | { | |
2204 | spin_lock(&p->alloc_lock); | |
2205 | } | |
2206 | ||
2207 | static inline void task_unlock(struct task_struct *p) | |
2208 | { | |
2209 | spin_unlock(&p->alloc_lock); | |
2210 | } | |
2211 | ||
f63ee72e ON |
2212 | extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
2213 | unsigned long *flags); | |
2214 | ||
2215 | static inline void unlock_task_sighand(struct task_struct *tsk, | |
2216 | unsigned long *flags) | |
2217 | { | |
2218 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
2219 | } | |
2220 | ||
f037360f AV |
2221 | #ifndef __HAVE_THREAD_FUNCTIONS |
2222 | ||
f7e4217b RZ |
2223 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
2224 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 2225 | |
10ebffde AV |
2226 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2227 | { | |
2228 | *task_thread_info(p) = *task_thread_info(org); | |
2229 | task_thread_info(p)->task = p; | |
2230 | } | |
2231 | ||
2232 | static inline unsigned long *end_of_stack(struct task_struct *p) | |
2233 | { | |
f7e4217b | 2234 | return (unsigned long *)(task_thread_info(p) + 1); |
10ebffde AV |
2235 | } |
2236 | ||
f037360f AV |
2237 | #endif |
2238 | ||
8b05c7e6 FT |
2239 | static inline int object_is_on_stack(void *obj) |
2240 | { | |
2241 | void *stack = task_stack_page(current); | |
2242 | ||
2243 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); | |
2244 | } | |
2245 | ||
8c9843e5 BH |
2246 | extern void thread_info_cache_init(void); |
2247 | ||
7c9f8861 ES |
2248 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2249 | static inline unsigned long stack_not_used(struct task_struct *p) | |
2250 | { | |
2251 | unsigned long *n = end_of_stack(p); | |
2252 | ||
2253 | do { /* Skip over canary */ | |
2254 | n++; | |
2255 | } while (!*n); | |
2256 | ||
2257 | return (unsigned long)n - (unsigned long)end_of_stack(p); | |
2258 | } | |
2259 | #endif | |
2260 | ||
1da177e4 LT |
2261 | /* set thread flags in other task's structures |
2262 | * - see asm/thread_info.h for TIF_xxxx flags available | |
2263 | */ | |
2264 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2265 | { | |
a1261f54 | 2266 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2267 | } |
2268 | ||
2269 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2270 | { | |
a1261f54 | 2271 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2272 | } |
2273 | ||
2274 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2275 | { | |
a1261f54 | 2276 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2277 | } |
2278 | ||
2279 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2280 | { | |
a1261f54 | 2281 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2282 | } |
2283 | ||
2284 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2285 | { | |
a1261f54 | 2286 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2287 | } |
2288 | ||
2289 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2290 | { | |
2291 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2292 | } | |
2293 | ||
2294 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2295 | { | |
2296 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2297 | } | |
2298 | ||
8ae121ac GH |
2299 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2300 | { | |
2301 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2302 | } | |
2303 | ||
690cc3ff EB |
2304 | static inline int restart_syscall(void) |
2305 | { | |
2306 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
2307 | return -ERESTARTNOINTR; | |
2308 | } | |
2309 | ||
1da177e4 LT |
2310 | static inline int signal_pending(struct task_struct *p) |
2311 | { | |
2312 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
2313 | } | |
f776d12d | 2314 | |
b3c97528 | 2315 | extern int __fatal_signal_pending(struct task_struct *p); |
f776d12d MW |
2316 | |
2317 | static inline int fatal_signal_pending(struct task_struct *p) | |
2318 | { | |
2319 | return signal_pending(p) && __fatal_signal_pending(p); | |
2320 | } | |
2321 | ||
16882c1e ON |
2322 | static inline int signal_pending_state(long state, struct task_struct *p) |
2323 | { | |
2324 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
2325 | return 0; | |
2326 | if (!signal_pending(p)) | |
2327 | return 0; | |
2328 | ||
16882c1e ON |
2329 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2330 | } | |
2331 | ||
1da177e4 LT |
2332 | static inline int need_resched(void) |
2333 | { | |
9404ef02 | 2334 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
1da177e4 LT |
2335 | } |
2336 | ||
2337 | /* | |
2338 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2339 | * explicit rescheduling in places that are safe. The return | |
2340 | * value indicates whether a reschedule was done in fact. | |
2341 | * cond_resched_lock() will drop the spinlock before scheduling, | |
2342 | * cond_resched_softirq() will enable bhs before scheduling. | |
2343 | */ | |
c3921ab7 | 2344 | extern int _cond_resched(void); |
6f80bd98 | 2345 | |
613afbf8 FW |
2346 | #define cond_resched() ({ \ |
2347 | __might_sleep(__FILE__, __LINE__, 0); \ | |
2348 | _cond_resched(); \ | |
2349 | }) | |
6f80bd98 | 2350 | |
613afbf8 FW |
2351 | extern int __cond_resched_lock(spinlock_t *lock); |
2352 | ||
716a4234 FW |
2353 | #ifdef CONFIG_PREEMPT |
2354 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET | |
02b67cc3 | 2355 | #else |
716a4234 | 2356 | #define PREEMPT_LOCK_OFFSET 0 |
02b67cc3 | 2357 | #endif |
716a4234 | 2358 | |
613afbf8 | 2359 | #define cond_resched_lock(lock) ({ \ |
716a4234 | 2360 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ |
613afbf8 FW |
2361 | __cond_resched_lock(lock); \ |
2362 | }) | |
2363 | ||
2364 | extern int __cond_resched_softirq(void); | |
2365 | ||
2366 | #define cond_resched_softirq() ({ \ | |
2367 | __might_sleep(__FILE__, __LINE__, SOFTIRQ_OFFSET); \ | |
2368 | __cond_resched_softirq(); \ | |
2369 | }) | |
1da177e4 LT |
2370 | |
2371 | /* | |
2372 | * Does a critical section need to be broken due to another | |
95c354fe NP |
2373 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2374 | * but a general need for low latency) | |
1da177e4 | 2375 | */ |
95c354fe | 2376 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2377 | { |
95c354fe NP |
2378 | #ifdef CONFIG_PREEMPT |
2379 | return spin_is_contended(lock); | |
2380 | #else | |
1da177e4 | 2381 | return 0; |
95c354fe | 2382 | #endif |
1da177e4 LT |
2383 | } |
2384 | ||
f06febc9 FM |
2385 | /* |
2386 | * Thread group CPU time accounting. | |
2387 | */ | |
4cd4c1b4 | 2388 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
4da94d49 | 2389 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
f06febc9 | 2390 | |
490dea45 | 2391 | static inline void thread_group_cputime_init(struct signal_struct *sig) |
f06febc9 | 2392 | { |
4cd4c1b4 PZ |
2393 | sig->cputimer.cputime = INIT_CPUTIME; |
2394 | spin_lock_init(&sig->cputimer.lock); | |
2395 | sig->cputimer.running = 0; | |
f06febc9 FM |
2396 | } |
2397 | ||
f06febc9 FM |
2398 | static inline void thread_group_cputime_free(struct signal_struct *sig) |
2399 | { | |
f06febc9 FM |
2400 | } |
2401 | ||
7bb44ade RM |
2402 | /* |
2403 | * Reevaluate whether the task has signals pending delivery. | |
2404 | * Wake the task if so. | |
2405 | * This is required every time the blocked sigset_t changes. | |
2406 | * callers must hold sighand->siglock. | |
2407 | */ | |
2408 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
2409 | extern void recalc_sigpending(void); |
2410 | ||
2411 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); | |
2412 | ||
2413 | /* | |
2414 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2415 | */ | |
2416 | #ifdef CONFIG_SMP | |
2417 | ||
2418 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2419 | { | |
a1261f54 | 2420 | return task_thread_info(p)->cpu; |
1da177e4 LT |
2421 | } |
2422 | ||
c65cc870 | 2423 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2424 | |
2425 | #else | |
2426 | ||
2427 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2428 | { | |
2429 | return 0; | |
2430 | } | |
2431 | ||
2432 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2433 | { | |
2434 | } | |
2435 | ||
2436 | #endif /* CONFIG_SMP */ | |
2437 | ||
1da177e4 | 2438 | extern void arch_pick_mmap_layout(struct mm_struct *mm); |
1da177e4 | 2439 | |
1a3c3034 IM |
2440 | #ifdef CONFIG_TRACING |
2441 | extern void | |
2442 | __trace_special(void *__tr, void *__data, | |
2443 | unsigned long arg1, unsigned long arg2, unsigned long arg3); | |
1da177e4 | 2444 | #else |
1a3c3034 IM |
2445 | static inline void |
2446 | __trace_special(void *__tr, void *__data, | |
2447 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
1da177e4 | 2448 | { |
1da177e4 LT |
2449 | } |
2450 | #endif | |
2451 | ||
96f874e2 RR |
2452 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2453 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2454 | |
1da177e4 LT |
2455 | extern void normalize_rt_tasks(void); |
2456 | ||
052f1dc7 | 2457 | #ifdef CONFIG_GROUP_SCHED |
9b5b7751 | 2458 | |
4cf86d77 | 2459 | extern struct task_group init_task_group; |
eff766a6 PZ |
2460 | #ifdef CONFIG_USER_SCHED |
2461 | extern struct task_group root_task_group; | |
6c415b92 | 2462 | extern void set_tg_uid(struct user_struct *user); |
eff766a6 | 2463 | #endif |
9b5b7751 | 2464 | |
ec7dc8ac | 2465 | extern struct task_group *sched_create_group(struct task_group *parent); |
4cf86d77 | 2466 | extern void sched_destroy_group(struct task_group *tg); |
9b5b7751 | 2467 | extern void sched_move_task(struct task_struct *tsk); |
052f1dc7 | 2468 | #ifdef CONFIG_FAIR_GROUP_SCHED |
4cf86d77 | 2469 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); |
5cb350ba | 2470 | extern unsigned long sched_group_shares(struct task_group *tg); |
052f1dc7 PZ |
2471 | #endif |
2472 | #ifdef CONFIG_RT_GROUP_SCHED | |
9f0c1e56 PZ |
2473 | extern int sched_group_set_rt_runtime(struct task_group *tg, |
2474 | long rt_runtime_us); | |
2475 | extern long sched_group_rt_runtime(struct task_group *tg); | |
d0b27fa7 PZ |
2476 | extern int sched_group_set_rt_period(struct task_group *tg, |
2477 | long rt_period_us); | |
2478 | extern long sched_group_rt_period(struct task_group *tg); | |
54e99124 | 2479 | extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); |
052f1dc7 | 2480 | #endif |
9b5b7751 SV |
2481 | #endif |
2482 | ||
54e99124 DG |
2483 | extern int task_can_switch_user(struct user_struct *up, |
2484 | struct task_struct *tsk); | |
2485 | ||
4b98d11b AD |
2486 | #ifdef CONFIG_TASK_XACCT |
2487 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2488 | { | |
940389b8 | 2489 | tsk->ioac.rchar += amt; |
4b98d11b AD |
2490 | } |
2491 | ||
2492 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2493 | { | |
940389b8 | 2494 | tsk->ioac.wchar += amt; |
4b98d11b AD |
2495 | } |
2496 | ||
2497 | static inline void inc_syscr(struct task_struct *tsk) | |
2498 | { | |
940389b8 | 2499 | tsk->ioac.syscr++; |
4b98d11b AD |
2500 | } |
2501 | ||
2502 | static inline void inc_syscw(struct task_struct *tsk) | |
2503 | { | |
940389b8 | 2504 | tsk->ioac.syscw++; |
4b98d11b AD |
2505 | } |
2506 | #else | |
2507 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2508 | { | |
2509 | } | |
2510 | ||
2511 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2512 | { | |
2513 | } | |
2514 | ||
2515 | static inline void inc_syscr(struct task_struct *tsk) | |
2516 | { | |
2517 | } | |
2518 | ||
2519 | static inline void inc_syscw(struct task_struct *tsk) | |
2520 | { | |
2521 | } | |
2522 | #endif | |
2523 | ||
82455257 DH |
2524 | #ifndef TASK_SIZE_OF |
2525 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2526 | #endif | |
2527 | ||
0793a61d TG |
2528 | /* |
2529 | * Call the function if the target task is executing on a CPU right now: | |
2530 | */ | |
2531 | extern void task_oncpu_function_call(struct task_struct *p, | |
2532 | void (*func) (void *info), void *info); | |
2533 | ||
2534 | ||
cf475ad2 BS |
2535 | #ifdef CONFIG_MM_OWNER |
2536 | extern void mm_update_next_owner(struct mm_struct *mm); | |
2537 | extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); | |
2538 | #else | |
2539 | static inline void mm_update_next_owner(struct mm_struct *mm) | |
2540 | { | |
2541 | } | |
2542 | ||
2543 | static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) | |
2544 | { | |
2545 | } | |
2546 | #endif /* CONFIG_MM_OWNER */ | |
2547 | ||
7c731e0a SR |
2548 | #define TASK_STATE_TO_CHAR_STR "RSDTtZX" |
2549 | ||
1da177e4 LT |
2550 | #endif /* __KERNEL__ */ |
2551 | ||
2552 | #endif |