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1da177e4 LT |
1 | #ifndef _LINUX_SCHED_H |
2 | #define _LINUX_SCHED_H | |
3 | ||
607ca46e | 4 | #include <uapi/linux/sched.h> |
b7b3c76a | 5 | |
b7b3c76a DW |
6 | |
7 | struct sched_param { | |
8 | int sched_priority; | |
9 | }; | |
10 | ||
1da177e4 LT |
11 | #include <asm/param.h> /* for HZ */ |
12 | ||
1da177e4 LT |
13 | #include <linux/capability.h> |
14 | #include <linux/threads.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/timex.h> | |
18 | #include <linux/jiffies.h> | |
19 | #include <linux/rbtree.h> | |
20 | #include <linux/thread_info.h> | |
21 | #include <linux/cpumask.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/nodemask.h> | |
c92ff1bd | 24 | #include <linux/mm_types.h> |
1da177e4 | 25 | |
1da177e4 LT |
26 | #include <asm/page.h> |
27 | #include <asm/ptrace.h> | |
1da177e4 LT |
28 | #include <asm/cputime.h> |
29 | ||
30 | #include <linux/smp.h> | |
31 | #include <linux/sem.h> | |
32 | #include <linux/signal.h> | |
1da177e4 LT |
33 | #include <linux/compiler.h> |
34 | #include <linux/completion.h> | |
35 | #include <linux/pid.h> | |
36 | #include <linux/percpu.h> | |
37 | #include <linux/topology.h> | |
3e26c149 | 38 | #include <linux/proportions.h> |
1da177e4 | 39 | #include <linux/seccomp.h> |
e56d0903 | 40 | #include <linux/rcupdate.h> |
05725f7e | 41 | #include <linux/rculist.h> |
23f78d4a | 42 | #include <linux/rtmutex.h> |
1da177e4 | 43 | |
a3b6714e DW |
44 | #include <linux/time.h> |
45 | #include <linux/param.h> | |
46 | #include <linux/resource.h> | |
47 | #include <linux/timer.h> | |
48 | #include <linux/hrtimer.h> | |
7c3ab738 | 49 | #include <linux/task_io_accounting.h> |
9745512c | 50 | #include <linux/latencytop.h> |
9e2b2dc4 | 51 | #include <linux/cred.h> |
fa14ff4a | 52 | #include <linux/llist.h> |
7b44ab97 | 53 | #include <linux/uidgid.h> |
21caf2fc | 54 | #include <linux/gfp.h> |
a3b6714e DW |
55 | |
56 | #include <asm/processor.h> | |
36d57ac4 | 57 | |
1da177e4 | 58 | struct exec_domain; |
c87e2837 | 59 | struct futex_pi_state; |
286100a6 | 60 | struct robust_list_head; |
bddd87c7 | 61 | struct bio_list; |
5ad4e53b | 62 | struct fs_struct; |
cdd6c482 | 63 | struct perf_event_context; |
73c10101 | 64 | struct blk_plug; |
1da177e4 | 65 | |
1da177e4 LT |
66 | /* |
67 | * List of flags we want to share for kernel threads, | |
68 | * if only because they are not used by them anyway. | |
69 | */ | |
70 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) | |
71 | ||
72 | /* | |
73 | * These are the constant used to fake the fixed-point load-average | |
74 | * counting. Some notes: | |
75 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
76 | * a load-average precision of 10 bits integer + 11 bits fractional | |
77 | * - if you want to count load-averages more often, you need more | |
78 | * precision, or rounding will get you. With 2-second counting freq, | |
79 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
80 | * 11 bit fractions. | |
81 | */ | |
82 | extern unsigned long avenrun[]; /* Load averages */ | |
2d02494f | 83 | extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); |
1da177e4 LT |
84 | |
85 | #define FSHIFT 11 /* nr of bits of precision */ | |
86 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 87 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
88 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
89 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
90 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
91 | ||
92 | #define CALC_LOAD(load,exp,n) \ | |
93 | load *= exp; \ | |
94 | load += n*(FIXED_1-exp); \ | |
95 | load >>= FSHIFT; | |
96 | ||
97 | extern unsigned long total_forks; | |
98 | extern int nr_threads; | |
1da177e4 LT |
99 | DECLARE_PER_CPU(unsigned long, process_counts); |
100 | extern int nr_processes(void); | |
101 | extern unsigned long nr_running(void); | |
1da177e4 | 102 | extern unsigned long nr_iowait(void); |
8c215bd3 | 103 | extern unsigned long nr_iowait_cpu(int cpu); |
69d25870 AV |
104 | extern unsigned long this_cpu_load(void); |
105 | ||
106 | ||
0f004f5a | 107 | extern void calc_global_load(unsigned long ticks); |
5aaa0b7a | 108 | extern void update_cpu_load_nohz(void); |
1da177e4 | 109 | |
7e49fcce SR |
110 | extern unsigned long get_parent_ip(unsigned long addr); |
111 | ||
b637a328 PM |
112 | extern void dump_cpu_task(int cpu); |
113 | ||
43ae34cb IM |
114 | struct seq_file; |
115 | struct cfs_rq; | |
4cf86d77 | 116 | struct task_group; |
43ae34cb IM |
117 | #ifdef CONFIG_SCHED_DEBUG |
118 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
119 | extern void proc_sched_set_task(struct task_struct *p); | |
120 | extern void | |
5cef9eca | 121 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
43ae34cb | 122 | #endif |
1da177e4 | 123 | |
4a8342d2 LT |
124 | /* |
125 | * Task state bitmask. NOTE! These bits are also | |
126 | * encoded in fs/proc/array.c: get_task_state(). | |
127 | * | |
128 | * We have two separate sets of flags: task->state | |
129 | * is about runnability, while task->exit_state are | |
130 | * about the task exiting. Confusing, but this way | |
131 | * modifying one set can't modify the other one by | |
132 | * mistake. | |
133 | */ | |
1da177e4 LT |
134 | #define TASK_RUNNING 0 |
135 | #define TASK_INTERRUPTIBLE 1 | |
136 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
137 | #define __TASK_STOPPED 4 |
138 | #define __TASK_TRACED 8 | |
4a8342d2 LT |
139 | /* in tsk->exit_state */ |
140 | #define EXIT_ZOMBIE 16 | |
141 | #define EXIT_DEAD 32 | |
142 | /* in tsk->state again */ | |
af927232 | 143 | #define TASK_DEAD 64 |
f021a3c2 | 144 | #define TASK_WAKEKILL 128 |
e9c84311 | 145 | #define TASK_WAKING 256 |
f2530dc7 TG |
146 | #define TASK_PARKED 512 |
147 | #define TASK_STATE_MAX 1024 | |
f021a3c2 | 148 | |
f2530dc7 | 149 | #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP" |
73342151 | 150 | |
e1781538 PZ |
151 | extern char ___assert_task_state[1 - 2*!!( |
152 | sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; | |
f021a3c2 MW |
153 | |
154 | /* Convenience macros for the sake of set_task_state */ | |
155 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
156 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
157 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 158 | |
92a1f4bc MW |
159 | /* Convenience macros for the sake of wake_up */ |
160 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 161 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
162 | |
163 | /* get_task_state() */ | |
164 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 MW |
165 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
166 | __TASK_TRACED) | |
92a1f4bc | 167 | |
f021a3c2 MW |
168 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
169 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
8f92054e | 170 | #define task_is_dead(task) ((task)->exit_state != 0) |
92a1f4bc | 171 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 172 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 173 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 174 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
376fede8 | 175 | (task->flags & PF_FROZEN) == 0) |
1da177e4 LT |
176 | |
177 | #define __set_task_state(tsk, state_value) \ | |
178 | do { (tsk)->state = (state_value); } while (0) | |
179 | #define set_task_state(tsk, state_value) \ | |
180 | set_mb((tsk)->state, (state_value)) | |
181 | ||
498d0c57 AM |
182 | /* |
183 | * set_current_state() includes a barrier so that the write of current->state | |
184 | * is correctly serialised wrt the caller's subsequent test of whether to | |
185 | * actually sleep: | |
186 | * | |
187 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
188 | * if (do_i_need_to_sleep()) | |
189 | * schedule(); | |
190 | * | |
191 | * If the caller does not need such serialisation then use __set_current_state() | |
192 | */ | |
1da177e4 LT |
193 | #define __set_current_state(state_value) \ |
194 | do { current->state = (state_value); } while (0) | |
195 | #define set_current_state(state_value) \ | |
196 | set_mb(current->state, (state_value)) | |
197 | ||
198 | /* Task command name length */ | |
199 | #define TASK_COMM_LEN 16 | |
200 | ||
1da177e4 LT |
201 | #include <linux/spinlock.h> |
202 | ||
203 | /* | |
204 | * This serializes "schedule()" and also protects | |
205 | * the run-queue from deletions/modifications (but | |
206 | * _adding_ to the beginning of the run-queue has | |
207 | * a separate lock). | |
208 | */ | |
209 | extern rwlock_t tasklist_lock; | |
210 | extern spinlock_t mmlist_lock; | |
211 | ||
36c8b586 | 212 | struct task_struct; |
1da177e4 | 213 | |
db1466b3 PM |
214 | #ifdef CONFIG_PROVE_RCU |
215 | extern int lockdep_tasklist_lock_is_held(void); | |
216 | #endif /* #ifdef CONFIG_PROVE_RCU */ | |
217 | ||
1da177e4 LT |
218 | extern void sched_init(void); |
219 | extern void sched_init_smp(void); | |
2d07b255 | 220 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
36c8b586 | 221 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 222 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 | 223 | |
89f19f04 | 224 | extern int runqueue_is_locked(int cpu); |
017730c1 | 225 | |
3451d024 | 226 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) |
c1cc017c | 227 | extern void nohz_balance_enter_idle(int cpu); |
69e1e811 | 228 | extern void set_cpu_sd_state_idle(void); |
83cd4fe2 | 229 | extern int get_nohz_timer_target(void); |
46cb4b7c | 230 | #else |
c1cc017c | 231 | static inline void nohz_balance_enter_idle(int cpu) { } |
fdaabd80 | 232 | static inline void set_cpu_sd_state_idle(void) { } |
46cb4b7c | 233 | #endif |
1da177e4 | 234 | |
e59e2ae2 | 235 | /* |
39bc89fd | 236 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
237 | */ |
238 | extern void show_state_filter(unsigned long state_filter); | |
239 | ||
240 | static inline void show_state(void) | |
241 | { | |
39bc89fd | 242 | show_state_filter(0); |
e59e2ae2 IM |
243 | } |
244 | ||
1da177e4 LT |
245 | extern void show_regs(struct pt_regs *); |
246 | ||
247 | /* | |
248 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
249 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
250 | * trace (or NULL if the entire call-chain of the task should be shown). | |
251 | */ | |
252 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
253 | ||
254 | void io_schedule(void); | |
255 | long io_schedule_timeout(long timeout); | |
256 | ||
257 | extern void cpu_init (void); | |
258 | extern void trap_init(void); | |
259 | extern void update_process_times(int user); | |
260 | extern void scheduler_tick(void); | |
261 | ||
82a1fcb9 IM |
262 | extern void sched_show_task(struct task_struct *p); |
263 | ||
19cc36c0 | 264 | #ifdef CONFIG_LOCKUP_DETECTOR |
8446f1d3 | 265 | extern void touch_softlockup_watchdog(void); |
d6ad3e28 | 266 | extern void touch_softlockup_watchdog_sync(void); |
04c9167f | 267 | extern void touch_all_softlockup_watchdogs(void); |
332fbdbc DZ |
268 | extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, |
269 | void __user *buffer, | |
270 | size_t *lenp, loff_t *ppos); | |
9c44bc03 | 271 | extern unsigned int softlockup_panic; |
004417a6 | 272 | void lockup_detector_init(void); |
8446f1d3 | 273 | #else |
8446f1d3 IM |
274 | static inline void touch_softlockup_watchdog(void) |
275 | { | |
276 | } | |
d6ad3e28 JW |
277 | static inline void touch_softlockup_watchdog_sync(void) |
278 | { | |
279 | } | |
04c9167f JF |
280 | static inline void touch_all_softlockup_watchdogs(void) |
281 | { | |
282 | } | |
004417a6 PZ |
283 | static inline void lockup_detector_init(void) |
284 | { | |
285 | } | |
8446f1d3 IM |
286 | #endif |
287 | ||
1da177e4 LT |
288 | /* Attach to any functions which should be ignored in wchan output. */ |
289 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
290 | |
291 | /* Linker adds these: start and end of __sched functions */ | |
292 | extern char __sched_text_start[], __sched_text_end[]; | |
293 | ||
1da177e4 LT |
294 | /* Is this address in the __sched functions? */ |
295 | extern int in_sched_functions(unsigned long addr); | |
296 | ||
297 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
b3c97528 | 298 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 299 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 300 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 301 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
1da177e4 | 302 | asmlinkage void schedule(void); |
c5491ea7 | 303 | extern void schedule_preempt_disabled(void); |
1da177e4 | 304 | |
ab516013 | 305 | struct nsproxy; |
acce292c | 306 | struct user_namespace; |
1da177e4 | 307 | |
efc1a3b1 DH |
308 | #ifdef CONFIG_MMU |
309 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1da177e4 LT |
310 | extern unsigned long |
311 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
312 | unsigned long, unsigned long); | |
313 | extern unsigned long | |
314 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
315 | unsigned long len, unsigned long pgoff, | |
316 | unsigned long flags); | |
efc1a3b1 DH |
317 | #else |
318 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} | |
319 | #endif | |
1da177e4 | 320 | |
901608d9 | 321 | |
6c5d5238 KH |
322 | extern void set_dumpable(struct mm_struct *mm, int value); |
323 | extern int get_dumpable(struct mm_struct *mm); | |
324 | ||
325 | /* mm flags */ | |
3cb4a0bb | 326 | /* dumpable bits */ |
6c5d5238 KH |
327 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
328 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ | |
f8af4da3 | 329 | |
3cb4a0bb | 330 | #define MMF_DUMPABLE_BITS 2 |
f8af4da3 | 331 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
3cb4a0bb KH |
332 | |
333 | /* coredump filter bits */ | |
334 | #define MMF_DUMP_ANON_PRIVATE 2 | |
335 | #define MMF_DUMP_ANON_SHARED 3 | |
336 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
337 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 338 | #define MMF_DUMP_ELF_HEADERS 6 |
e575f111 KM |
339 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
340 | #define MMF_DUMP_HUGETLB_SHARED 8 | |
f8af4da3 | 341 | |
3cb4a0bb | 342 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
e575f111 | 343 | #define MMF_DUMP_FILTER_BITS 7 |
3cb4a0bb KH |
344 | #define MMF_DUMP_FILTER_MASK \ |
345 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
346 | #define MMF_DUMP_FILTER_DEFAULT \ | |
e575f111 | 347 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
656eb2cd RM |
348 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
349 | ||
350 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS | |
351 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) | |
352 | #else | |
353 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 | |
354 | #endif | |
f8af4da3 HD |
355 | /* leave room for more dump flags */ |
356 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ | |
ba76149f | 357 | #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ |
bafb282d | 358 | #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */ |
f8af4da3 | 359 | |
9f68f672 ON |
360 | #define MMF_HAS_UPROBES 19 /* has uprobes */ |
361 | #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */ | |
f8ac4ec9 | 362 | |
f8af4da3 | 363 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) |
6c5d5238 | 364 | |
1da177e4 LT |
365 | struct sighand_struct { |
366 | atomic_t count; | |
367 | struct k_sigaction action[_NSIG]; | |
368 | spinlock_t siglock; | |
b8fceee1 | 369 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
370 | }; |
371 | ||
0e464814 | 372 | struct pacct_struct { |
f6ec29a4 KK |
373 | int ac_flag; |
374 | long ac_exitcode; | |
0e464814 | 375 | unsigned long ac_mem; |
77787bfb KK |
376 | cputime_t ac_utime, ac_stime; |
377 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
378 | }; |
379 | ||
42c4ab41 SG |
380 | struct cpu_itimer { |
381 | cputime_t expires; | |
382 | cputime_t incr; | |
8356b5f9 SG |
383 | u32 error; |
384 | u32 incr_error; | |
42c4ab41 SG |
385 | }; |
386 | ||
d37f761d FW |
387 | /** |
388 | * struct cputime - snaphsot of system and user cputime | |
389 | * @utime: time spent in user mode | |
390 | * @stime: time spent in system mode | |
391 | * | |
392 | * Gathers a generic snapshot of user and system time. | |
393 | */ | |
394 | struct cputime { | |
395 | cputime_t utime; | |
396 | cputime_t stime; | |
397 | }; | |
398 | ||
f06febc9 FM |
399 | /** |
400 | * struct task_cputime - collected CPU time counts | |
401 | * @utime: time spent in user mode, in &cputime_t units | |
402 | * @stime: time spent in kernel mode, in &cputime_t units | |
403 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds | |
5ce73a4a | 404 | * |
d37f761d FW |
405 | * This is an extension of struct cputime that includes the total runtime |
406 | * spent by the task from the scheduler point of view. | |
407 | * | |
408 | * As a result, this structure groups together three kinds of CPU time | |
409 | * that are tracked for threads and thread groups. Most things considering | |
f06febc9 FM |
410 | * CPU time want to group these counts together and treat all three |
411 | * of them in parallel. | |
412 | */ | |
413 | struct task_cputime { | |
414 | cputime_t utime; | |
415 | cputime_t stime; | |
416 | unsigned long long sum_exec_runtime; | |
417 | }; | |
418 | /* Alternate field names when used to cache expirations. */ | |
419 | #define prof_exp stime | |
420 | #define virt_exp utime | |
421 | #define sched_exp sum_exec_runtime | |
422 | ||
4cd4c1b4 PZ |
423 | #define INIT_CPUTIME \ |
424 | (struct task_cputime) { \ | |
64861634 MS |
425 | .utime = 0, \ |
426 | .stime = 0, \ | |
4cd4c1b4 PZ |
427 | .sum_exec_runtime = 0, \ |
428 | } | |
429 | ||
c99e6efe PZ |
430 | /* |
431 | * Disable preemption until the scheduler is running. | |
432 | * Reset by start_kernel()->sched_init()->init_idle(). | |
d86ee480 PZ |
433 | * |
434 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working | |
435 | * before the scheduler is active -- see should_resched(). | |
c99e6efe | 436 | */ |
d86ee480 | 437 | #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) |
c99e6efe | 438 | |
f06febc9 | 439 | /** |
4cd4c1b4 PZ |
440 | * struct thread_group_cputimer - thread group interval timer counts |
441 | * @cputime: thread group interval timers. | |
442 | * @running: non-zero when there are timers running and | |
443 | * @cputime receives updates. | |
444 | * @lock: lock for fields in this struct. | |
f06febc9 FM |
445 | * |
446 | * This structure contains the version of task_cputime, above, that is | |
4cd4c1b4 | 447 | * used for thread group CPU timer calculations. |
f06febc9 | 448 | */ |
4cd4c1b4 PZ |
449 | struct thread_group_cputimer { |
450 | struct task_cputime cputime; | |
451 | int running; | |
ee30a7b2 | 452 | raw_spinlock_t lock; |
f06febc9 | 453 | }; |
f06febc9 | 454 | |
4714d1d3 | 455 | #include <linux/rwsem.h> |
5091faa4 MG |
456 | struct autogroup; |
457 | ||
1da177e4 | 458 | /* |
e815f0a8 | 459 | * NOTE! "signal_struct" does not have its own |
1da177e4 LT |
460 | * locking, because a shared signal_struct always |
461 | * implies a shared sighand_struct, so locking | |
462 | * sighand_struct is always a proper superset of | |
463 | * the locking of signal_struct. | |
464 | */ | |
465 | struct signal_struct { | |
ea6d290c | 466 | atomic_t sigcnt; |
1da177e4 | 467 | atomic_t live; |
b3ac022c | 468 | int nr_threads; |
1da177e4 LT |
469 | |
470 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
471 | ||
472 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 473 | struct task_struct *curr_target; |
1da177e4 LT |
474 | |
475 | /* shared signal handling: */ | |
476 | struct sigpending shared_pending; | |
477 | ||
478 | /* thread group exit support */ | |
479 | int group_exit_code; | |
480 | /* overloaded: | |
481 | * - notify group_exit_task when ->count is equal to notify_count | |
482 | * - everyone except group_exit_task is stopped during signal delivery | |
483 | * of fatal signals, group_exit_task processes the signal. | |
484 | */ | |
1da177e4 | 485 | int notify_count; |
07dd20e0 | 486 | struct task_struct *group_exit_task; |
1da177e4 LT |
487 | |
488 | /* thread group stop support, overloads group_exit_code too */ | |
489 | int group_stop_count; | |
490 | unsigned int flags; /* see SIGNAL_* flags below */ | |
491 | ||
ebec18a6 LP |
492 | /* |
493 | * PR_SET_CHILD_SUBREAPER marks a process, like a service | |
494 | * manager, to re-parent orphan (double-forking) child processes | |
495 | * to this process instead of 'init'. The service manager is | |
496 | * able to receive SIGCHLD signals and is able to investigate | |
497 | * the process until it calls wait(). All children of this | |
498 | * process will inherit a flag if they should look for a | |
499 | * child_subreaper process at exit. | |
500 | */ | |
501 | unsigned int is_child_subreaper:1; | |
502 | unsigned int has_child_subreaper:1; | |
503 | ||
1da177e4 | 504 | /* POSIX.1b Interval Timers */ |
5ed67f05 PE |
505 | int posix_timer_id; |
506 | struct list_head posix_timers; | |
1da177e4 LT |
507 | |
508 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 509 | struct hrtimer real_timer; |
fea9d175 | 510 | struct pid *leader_pid; |
2ff678b8 | 511 | ktime_t it_real_incr; |
1da177e4 | 512 | |
42c4ab41 SG |
513 | /* |
514 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use | |
515 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these | |
516 | * values are defined to 0 and 1 respectively | |
517 | */ | |
518 | struct cpu_itimer it[2]; | |
1da177e4 | 519 | |
f06febc9 | 520 | /* |
4cd4c1b4 PZ |
521 | * Thread group totals for process CPU timers. |
522 | * See thread_group_cputimer(), et al, for details. | |
f06febc9 | 523 | */ |
4cd4c1b4 | 524 | struct thread_group_cputimer cputimer; |
f06febc9 FM |
525 | |
526 | /* Earliest-expiration cache. */ | |
527 | struct task_cputime cputime_expires; | |
528 | ||
529 | struct list_head cpu_timers[3]; | |
530 | ||
ab521dc0 | 531 | struct pid *tty_old_pgrp; |
1ec320af | 532 | |
1da177e4 LT |
533 | /* boolean value for session group leader */ |
534 | int leader; | |
535 | ||
536 | struct tty_struct *tty; /* NULL if no tty */ | |
537 | ||
5091faa4 MG |
538 | #ifdef CONFIG_SCHED_AUTOGROUP |
539 | struct autogroup *autogroup; | |
540 | #endif | |
1da177e4 LT |
541 | /* |
542 | * Cumulative resource counters for dead threads in the group, | |
543 | * and for reaped dead child processes forked by this group. | |
544 | * Live threads maintain their own counters and add to these | |
545 | * in __exit_signal, except for the group leader. | |
546 | */ | |
32bd671d | 547 | cputime_t utime, stime, cutime, cstime; |
9ac52315 LV |
548 | cputime_t gtime; |
549 | cputime_t cgtime; | |
9fbc42ea | 550 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
d37f761d | 551 | struct cputime prev_cputime; |
0cf55e1e | 552 | #endif |
1da177e4 LT |
553 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
554 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 555 | unsigned long inblock, oublock, cinblock, coublock; |
1f10206c | 556 | unsigned long maxrss, cmaxrss; |
940389b8 | 557 | struct task_io_accounting ioac; |
1da177e4 | 558 | |
32bd671d PZ |
559 | /* |
560 | * Cumulative ns of schedule CPU time fo dead threads in the | |
561 | * group, not including a zombie group leader, (This only differs | |
562 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
563 | * other than jiffies.) | |
564 | */ | |
565 | unsigned long long sum_sched_runtime; | |
566 | ||
1da177e4 LT |
567 | /* |
568 | * We don't bother to synchronize most readers of this at all, | |
569 | * because there is no reader checking a limit that actually needs | |
570 | * to get both rlim_cur and rlim_max atomically, and either one | |
571 | * alone is a single word that can safely be read normally. | |
572 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
573 | * protect this instead of the siglock, because they really | |
574 | * have no need to disable irqs. | |
575 | */ | |
576 | struct rlimit rlim[RLIM_NLIMITS]; | |
577 | ||
0e464814 KK |
578 | #ifdef CONFIG_BSD_PROCESS_ACCT |
579 | struct pacct_struct pacct; /* per-process accounting information */ | |
580 | #endif | |
ad4ecbcb | 581 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
582 | struct taskstats *stats; |
583 | #endif | |
522ed776 MT |
584 | #ifdef CONFIG_AUDIT |
585 | unsigned audit_tty; | |
46e959ea | 586 | unsigned audit_tty_log_passwd; |
522ed776 MT |
587 | struct tty_audit_buf *tty_audit_buf; |
588 | #endif | |
4714d1d3 BB |
589 | #ifdef CONFIG_CGROUPS |
590 | /* | |
77e4ef99 TH |
591 | * group_rwsem prevents new tasks from entering the threadgroup and |
592 | * member tasks from exiting,a more specifically, setting of | |
593 | * PF_EXITING. fork and exit paths are protected with this rwsem | |
594 | * using threadgroup_change_begin/end(). Users which require | |
595 | * threadgroup to remain stable should use threadgroup_[un]lock() | |
596 | * which also takes care of exec path. Currently, cgroup is the | |
597 | * only user. | |
4714d1d3 | 598 | */ |
257058ae | 599 | struct rw_semaphore group_rwsem; |
4714d1d3 | 600 | #endif |
28b83c51 | 601 | |
e1e12d2f | 602 | oom_flags_t oom_flags; |
a9c58b90 DR |
603 | short oom_score_adj; /* OOM kill score adjustment */ |
604 | short oom_score_adj_min; /* OOM kill score adjustment min value. | |
605 | * Only settable by CAP_SYS_RESOURCE. */ | |
9b1bf12d KM |
606 | |
607 | struct mutex cred_guard_mutex; /* guard against foreign influences on | |
608 | * credential calculations | |
609 | * (notably. ptrace) */ | |
1da177e4 LT |
610 | }; |
611 | ||
612 | /* | |
613 | * Bits in flags field of signal_struct. | |
614 | */ | |
615 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
ee77f075 ON |
616 | #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ |
617 | #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ | |
403bad72 | 618 | #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */ |
e4420551 ON |
619 | /* |
620 | * Pending notifications to parent. | |
621 | */ | |
622 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
623 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
624 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
1da177e4 | 625 | |
fae5fa44 ON |
626 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
627 | ||
ed5d2cac ON |
628 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
629 | static inline int signal_group_exit(const struct signal_struct *sig) | |
630 | { | |
631 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
632 | (sig->group_exit_task != NULL); | |
633 | } | |
634 | ||
1da177e4 LT |
635 | /* |
636 | * Some day this will be a full-fledged user tracking system.. | |
637 | */ | |
638 | struct user_struct { | |
639 | atomic_t __count; /* reference count */ | |
640 | atomic_t processes; /* How many processes does this user have? */ | |
641 | atomic_t files; /* How many open files does this user have? */ | |
642 | atomic_t sigpending; /* How many pending signals does this user have? */ | |
2d9048e2 | 643 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
644 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
645 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
646 | #endif | |
4afeff85 EP |
647 | #ifdef CONFIG_FANOTIFY |
648 | atomic_t fanotify_listeners; | |
649 | #endif | |
7ef9964e | 650 | #ifdef CONFIG_EPOLL |
52bd19f7 | 651 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
7ef9964e | 652 | #endif |
970a8645 | 653 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
654 | /* protected by mq_lock */ |
655 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 656 | #endif |
1da177e4 LT |
657 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
658 | ||
659 | #ifdef CONFIG_KEYS | |
660 | struct key *uid_keyring; /* UID specific keyring */ | |
661 | struct key *session_keyring; /* UID's default session keyring */ | |
662 | #endif | |
663 | ||
664 | /* Hash table maintenance information */ | |
735de223 | 665 | struct hlist_node uidhash_node; |
7b44ab97 | 666 | kuid_t uid; |
24e377a8 | 667 | |
cdd6c482 | 668 | #ifdef CONFIG_PERF_EVENTS |
789f90fc PZ |
669 | atomic_long_t locked_vm; |
670 | #endif | |
1da177e4 LT |
671 | }; |
672 | ||
eb41d946 | 673 | extern int uids_sysfs_init(void); |
5cb350ba | 674 | |
7b44ab97 | 675 | extern struct user_struct *find_user(kuid_t); |
1da177e4 LT |
676 | |
677 | extern struct user_struct root_user; | |
678 | #define INIT_USER (&root_user) | |
679 | ||
b6dff3ec | 680 | |
1da177e4 LT |
681 | struct backing_dev_info; |
682 | struct reclaim_state; | |
683 | ||
52f17b6c | 684 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
685 | struct sched_info { |
686 | /* cumulative counters */ | |
2d72376b | 687 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 688 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
689 | |
690 | /* timestamps */ | |
172ba844 BS |
691 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
692 | last_queued; /* when we were last queued to run */ | |
1da177e4 | 693 | }; |
52f17b6c | 694 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 695 | |
ca74e92b SN |
696 | #ifdef CONFIG_TASK_DELAY_ACCT |
697 | struct task_delay_info { | |
698 | spinlock_t lock; | |
699 | unsigned int flags; /* Private per-task flags */ | |
700 | ||
701 | /* For each stat XXX, add following, aligned appropriately | |
702 | * | |
703 | * struct timespec XXX_start, XXX_end; | |
704 | * u64 XXX_delay; | |
705 | * u32 XXX_count; | |
706 | * | |
707 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
708 | * single lock above (split into XXX_lock if contention is an issue). | |
709 | */ | |
0ff92245 SN |
710 | |
711 | /* | |
712 | * XXX_count is incremented on every XXX operation, the delay | |
713 | * associated with the operation is added to XXX_delay. | |
714 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
715 | */ | |
716 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ | |
717 | u64 blkio_delay; /* wait for sync block io completion */ | |
718 | u64 swapin_delay; /* wait for swapin block io completion */ | |
719 | u32 blkio_count; /* total count of the number of sync block */ | |
720 | /* io operations performed */ | |
721 | u32 swapin_count; /* total count of the number of swapin block */ | |
722 | /* io operations performed */ | |
873b4771 KK |
723 | |
724 | struct timespec freepages_start, freepages_end; | |
725 | u64 freepages_delay; /* wait for memory reclaim */ | |
726 | u32 freepages_count; /* total count of memory reclaim */ | |
ca74e92b | 727 | }; |
52f17b6c CS |
728 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
729 | ||
730 | static inline int sched_info_on(void) | |
731 | { | |
732 | #ifdef CONFIG_SCHEDSTATS | |
733 | return 1; | |
734 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
735 | extern int delayacct_on; | |
736 | return delayacct_on; | |
737 | #else | |
738 | return 0; | |
ca74e92b | 739 | #endif |
52f17b6c | 740 | } |
ca74e92b | 741 | |
d15bcfdb IM |
742 | enum cpu_idle_type { |
743 | CPU_IDLE, | |
744 | CPU_NOT_IDLE, | |
745 | CPU_NEWLY_IDLE, | |
746 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
747 | }; |
748 | ||
1399fa78 NR |
749 | /* |
750 | * Increase resolution of cpu_power calculations | |
751 | */ | |
752 | #define SCHED_POWER_SHIFT 10 | |
753 | #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT) | |
1da177e4 | 754 | |
1399fa78 NR |
755 | /* |
756 | * sched-domains (multiprocessor balancing) declarations: | |
757 | */ | |
2dd73a4f | 758 | #ifdef CONFIG_SMP |
b5d978e0 PZ |
759 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
760 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ | |
761 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ | |
762 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ | |
c88d5910 | 763 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
b5d978e0 | 764 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
b5d978e0 | 765 | #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ |
b5d978e0 PZ |
766 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ |
767 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ | |
532cb4c4 | 768 | #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ |
b5d978e0 | 769 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
e3589f6c | 770 | #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ |
5c45bf27 | 771 | |
532cb4c4 MN |
772 | extern int __weak arch_sd_sibiling_asym_packing(void); |
773 | ||
1d3504fc HS |
774 | struct sched_domain_attr { |
775 | int relax_domain_level; | |
776 | }; | |
777 | ||
778 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ | |
779 | .relax_domain_level = -1, \ | |
780 | } | |
781 | ||
60495e77 PZ |
782 | extern int sched_domain_level_max; |
783 | ||
5e6521ea LZ |
784 | struct sched_group; |
785 | ||
1da177e4 LT |
786 | struct sched_domain { |
787 | /* These fields must be setup */ | |
788 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 789 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 | 790 | struct sched_group *groups; /* the balancing groups of the domain */ |
1da177e4 LT |
791 | unsigned long min_interval; /* Minimum balance interval ms */ |
792 | unsigned long max_interval; /* Maximum balance interval ms */ | |
793 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
794 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 795 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
796 | unsigned int busy_idx; |
797 | unsigned int idle_idx; | |
798 | unsigned int newidle_idx; | |
799 | unsigned int wake_idx; | |
147cbb4b | 800 | unsigned int forkexec_idx; |
a52bfd73 | 801 | unsigned int smt_gain; |
25f55d9d VG |
802 | |
803 | int nohz_idle; /* NOHZ IDLE status */ | |
1da177e4 | 804 | int flags; /* See SD_* */ |
60495e77 | 805 | int level; |
1da177e4 LT |
806 | |
807 | /* Runtime fields. */ | |
808 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
809 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
810 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
811 | ||
2398f2c6 PZ |
812 | u64 last_update; |
813 | ||
1da177e4 LT |
814 | #ifdef CONFIG_SCHEDSTATS |
815 | /* load_balance() stats */ | |
480b9434 KC |
816 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
817 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; | |
818 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; | |
819 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; | |
820 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; | |
821 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; | |
822 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; | |
823 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; | |
1da177e4 LT |
824 | |
825 | /* Active load balancing */ | |
480b9434 KC |
826 | unsigned int alb_count; |
827 | unsigned int alb_failed; | |
828 | unsigned int alb_pushed; | |
1da177e4 | 829 | |
68767a0a | 830 | /* SD_BALANCE_EXEC stats */ |
480b9434 KC |
831 | unsigned int sbe_count; |
832 | unsigned int sbe_balanced; | |
833 | unsigned int sbe_pushed; | |
1da177e4 | 834 | |
68767a0a | 835 | /* SD_BALANCE_FORK stats */ |
480b9434 KC |
836 | unsigned int sbf_count; |
837 | unsigned int sbf_balanced; | |
838 | unsigned int sbf_pushed; | |
68767a0a | 839 | |
1da177e4 | 840 | /* try_to_wake_up() stats */ |
480b9434 KC |
841 | unsigned int ttwu_wake_remote; |
842 | unsigned int ttwu_move_affine; | |
843 | unsigned int ttwu_move_balance; | |
1da177e4 | 844 | #endif |
a5d8c348 IM |
845 | #ifdef CONFIG_SCHED_DEBUG |
846 | char *name; | |
847 | #endif | |
dce840a0 PZ |
848 | union { |
849 | void *private; /* used during construction */ | |
850 | struct rcu_head rcu; /* used during destruction */ | |
851 | }; | |
6c99e9ad | 852 | |
669c55e9 | 853 | unsigned int span_weight; |
4200efd9 IM |
854 | /* |
855 | * Span of all CPUs in this domain. | |
856 | * | |
857 | * NOTE: this field is variable length. (Allocated dynamically | |
858 | * by attaching extra space to the end of the structure, | |
859 | * depending on how many CPUs the kernel has booted up with) | |
4200efd9 IM |
860 | */ |
861 | unsigned long span[0]; | |
1da177e4 LT |
862 | }; |
863 | ||
758b2cdc RR |
864 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
865 | { | |
6c99e9ad | 866 | return to_cpumask(sd->span); |
758b2cdc RR |
867 | } |
868 | ||
acc3f5d7 | 869 | extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1d3504fc | 870 | struct sched_domain_attr *dattr_new); |
029190c5 | 871 | |
acc3f5d7 RR |
872 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
873 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); | |
874 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); | |
875 | ||
39be3501 PZ |
876 | bool cpus_share_cache(int this_cpu, int that_cpu); |
877 | ||
1b427c15 | 878 | #else /* CONFIG_SMP */ |
1da177e4 | 879 | |
1b427c15 | 880 | struct sched_domain_attr; |
d02c7a8c | 881 | |
1b427c15 | 882 | static inline void |
acc3f5d7 | 883 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1b427c15 IM |
884 | struct sched_domain_attr *dattr_new) |
885 | { | |
d02c7a8c | 886 | } |
39be3501 PZ |
887 | |
888 | static inline bool cpus_share_cache(int this_cpu, int that_cpu) | |
889 | { | |
890 | return true; | |
891 | } | |
892 | ||
1b427c15 | 893 | #endif /* !CONFIG_SMP */ |
1da177e4 | 894 | |
47fe38fc | 895 | |
1da177e4 | 896 | struct io_context; /* See blkdev.h */ |
1da177e4 | 897 | |
1da177e4 | 898 | |
383f2835 | 899 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 900 | extern void prefetch_stack(struct task_struct *t); |
383f2835 KC |
901 | #else |
902 | static inline void prefetch_stack(struct task_struct *t) { } | |
903 | #endif | |
1da177e4 LT |
904 | |
905 | struct audit_context; /* See audit.c */ | |
906 | struct mempolicy; | |
b92ce558 | 907 | struct pipe_inode_info; |
4865ecf1 | 908 | struct uts_namespace; |
1da177e4 | 909 | |
20b8a59f IM |
910 | struct load_weight { |
911 | unsigned long weight, inv_weight; | |
912 | }; | |
913 | ||
9d85f21c PT |
914 | struct sched_avg { |
915 | /* | |
916 | * These sums represent an infinite geometric series and so are bound | |
239003ea | 917 | * above by 1024/(1-y). Thus we only need a u32 to store them for all |
9d85f21c PT |
918 | * choices of y < 1-2^(-32)*1024. |
919 | */ | |
920 | u32 runnable_avg_sum, runnable_avg_period; | |
921 | u64 last_runnable_update; | |
9ee474f5 | 922 | s64 decay_count; |
2dac754e | 923 | unsigned long load_avg_contrib; |
9d85f21c PT |
924 | }; |
925 | ||
94c18227 | 926 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 927 | struct sched_statistics { |
20b8a59f | 928 | u64 wait_start; |
94c18227 | 929 | u64 wait_max; |
6d082592 AV |
930 | u64 wait_count; |
931 | u64 wait_sum; | |
8f0dfc34 AV |
932 | u64 iowait_count; |
933 | u64 iowait_sum; | |
94c18227 | 934 | |
20b8a59f | 935 | u64 sleep_start; |
20b8a59f | 936 | u64 sleep_max; |
94c18227 IM |
937 | s64 sum_sleep_runtime; |
938 | ||
939 | u64 block_start; | |
20b8a59f IM |
940 | u64 block_max; |
941 | u64 exec_max; | |
eba1ed4b | 942 | u64 slice_max; |
cc367732 | 943 | |
cc367732 IM |
944 | u64 nr_migrations_cold; |
945 | u64 nr_failed_migrations_affine; | |
946 | u64 nr_failed_migrations_running; | |
947 | u64 nr_failed_migrations_hot; | |
948 | u64 nr_forced_migrations; | |
cc367732 IM |
949 | |
950 | u64 nr_wakeups; | |
951 | u64 nr_wakeups_sync; | |
952 | u64 nr_wakeups_migrate; | |
953 | u64 nr_wakeups_local; | |
954 | u64 nr_wakeups_remote; | |
955 | u64 nr_wakeups_affine; | |
956 | u64 nr_wakeups_affine_attempts; | |
957 | u64 nr_wakeups_passive; | |
958 | u64 nr_wakeups_idle; | |
41acab88 LDM |
959 | }; |
960 | #endif | |
961 | ||
962 | struct sched_entity { | |
963 | struct load_weight load; /* for load-balancing */ | |
964 | struct rb_node run_node; | |
965 | struct list_head group_node; | |
966 | unsigned int on_rq; | |
967 | ||
968 | u64 exec_start; | |
969 | u64 sum_exec_runtime; | |
970 | u64 vruntime; | |
971 | u64 prev_sum_exec_runtime; | |
972 | ||
41acab88 LDM |
973 | u64 nr_migrations; |
974 | ||
41acab88 LDM |
975 | #ifdef CONFIG_SCHEDSTATS |
976 | struct sched_statistics statistics; | |
94c18227 IM |
977 | #endif |
978 | ||
20b8a59f IM |
979 | #ifdef CONFIG_FAIR_GROUP_SCHED |
980 | struct sched_entity *parent; | |
981 | /* rq on which this entity is (to be) queued: */ | |
982 | struct cfs_rq *cfs_rq; | |
983 | /* rq "owned" by this entity/group: */ | |
984 | struct cfs_rq *my_q; | |
985 | #endif | |
8bd75c77 | 986 | |
141965c7 | 987 | #ifdef CONFIG_SMP |
f4e26b12 | 988 | /* Per-entity load-tracking */ |
9d85f21c PT |
989 | struct sched_avg avg; |
990 | #endif | |
20b8a59f | 991 | }; |
70b97a7f | 992 | |
fa717060 PZ |
993 | struct sched_rt_entity { |
994 | struct list_head run_list; | |
78f2c7db | 995 | unsigned long timeout; |
57d2aa00 | 996 | unsigned long watchdog_stamp; |
bee367ed | 997 | unsigned int time_slice; |
6f505b16 | 998 | |
58d6c2d7 | 999 | struct sched_rt_entity *back; |
052f1dc7 | 1000 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
1001 | struct sched_rt_entity *parent; |
1002 | /* rq on which this entity is (to be) queued: */ | |
1003 | struct rt_rq *rt_rq; | |
1004 | /* rq "owned" by this entity/group: */ | |
1005 | struct rt_rq *my_q; | |
1006 | #endif | |
fa717060 PZ |
1007 | }; |
1008 | ||
8bd75c77 | 1009 | |
86848966 PM |
1010 | struct rcu_node; |
1011 | ||
8dc85d54 PZ |
1012 | enum perf_event_task_context { |
1013 | perf_invalid_context = -1, | |
1014 | perf_hw_context = 0, | |
89a1e187 | 1015 | perf_sw_context, |
8dc85d54 PZ |
1016 | perf_nr_task_contexts, |
1017 | }; | |
1018 | ||
1da177e4 LT |
1019 | struct task_struct { |
1020 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 1021 | void *stack; |
1da177e4 | 1022 | atomic_t usage; |
97dc32cd WC |
1023 | unsigned int flags; /* per process flags, defined below */ |
1024 | unsigned int ptrace; | |
1da177e4 | 1025 | |
2dd73a4f | 1026 | #ifdef CONFIG_SMP |
fa14ff4a | 1027 | struct llist_node wake_entry; |
3ca7a440 | 1028 | int on_cpu; |
62470419 MW |
1029 | struct task_struct *last_wakee; |
1030 | unsigned long wakee_flips; | |
1031 | unsigned long wakee_flip_decay_ts; | |
2dd73a4f | 1032 | #endif |
fd2f4419 | 1033 | int on_rq; |
50e645a8 | 1034 | |
b29739f9 | 1035 | int prio, static_prio, normal_prio; |
c7aceaba | 1036 | unsigned int rt_priority; |
5522d5d5 | 1037 | const struct sched_class *sched_class; |
20b8a59f | 1038 | struct sched_entity se; |
fa717060 | 1039 | struct sched_rt_entity rt; |
8323f26c PZ |
1040 | #ifdef CONFIG_CGROUP_SCHED |
1041 | struct task_group *sched_task_group; | |
1042 | #endif | |
1da177e4 | 1043 | |
e107be36 AK |
1044 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1045 | /* list of struct preempt_notifier: */ | |
1046 | struct hlist_head preempt_notifiers; | |
1047 | #endif | |
1048 | ||
18796aa0 AD |
1049 | /* |
1050 | * fpu_counter contains the number of consecutive context switches | |
1051 | * that the FPU is used. If this is over a threshold, the lazy fpu | |
1052 | * saving becomes unlazy to save the trap. This is an unsigned char | |
1053 | * so that after 256 times the counter wraps and the behavior turns | |
1054 | * lazy again; this to deal with bursty apps that only use FPU for | |
1055 | * a short time | |
1056 | */ | |
1057 | unsigned char fpu_counter; | |
6c5c9341 | 1058 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 1059 | unsigned int btrace_seq; |
6c5c9341 | 1060 | #endif |
1da177e4 | 1061 | |
97dc32cd | 1062 | unsigned int policy; |
29baa747 | 1063 | int nr_cpus_allowed; |
1da177e4 | 1064 | cpumask_t cpus_allowed; |
1da177e4 | 1065 | |
a57eb940 | 1066 | #ifdef CONFIG_PREEMPT_RCU |
e260be67 | 1067 | int rcu_read_lock_nesting; |
f41d911f | 1068 | char rcu_read_unlock_special; |
f41d911f | 1069 | struct list_head rcu_node_entry; |
a57eb940 PM |
1070 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
1071 | #ifdef CONFIG_TREE_PREEMPT_RCU | |
1072 | struct rcu_node *rcu_blocked_node; | |
f41d911f | 1073 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
24278d14 PM |
1074 | #ifdef CONFIG_RCU_BOOST |
1075 | struct rt_mutex *rcu_boost_mutex; | |
1076 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
e260be67 | 1077 | |
52f17b6c | 1078 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
1079 | struct sched_info sched_info; |
1080 | #endif | |
1081 | ||
1082 | struct list_head tasks; | |
806c09a7 | 1083 | #ifdef CONFIG_SMP |
917b627d | 1084 | struct plist_node pushable_tasks; |
806c09a7 | 1085 | #endif |
1da177e4 LT |
1086 | |
1087 | struct mm_struct *mm, *active_mm; | |
4471a675 JK |
1088 | #ifdef CONFIG_COMPAT_BRK |
1089 | unsigned brk_randomized:1; | |
1090 | #endif | |
34e55232 KH |
1091 | #if defined(SPLIT_RSS_COUNTING) |
1092 | struct task_rss_stat rss_stat; | |
1093 | #endif | |
1da177e4 | 1094 | /* task state */ |
97dc32cd | 1095 | int exit_state; |
1da177e4 LT |
1096 | int exit_code, exit_signal; |
1097 | int pdeath_signal; /* The signal sent when the parent dies */ | |
a8f072c1 | 1098 | unsigned int jobctl; /* JOBCTL_*, siglock protected */ |
9b89f6ba AE |
1099 | |
1100 | /* Used for emulating ABI behavior of previous Linux versions */ | |
97dc32cd | 1101 | unsigned int personality; |
9b89f6ba | 1102 | |
1da177e4 | 1103 | unsigned did_exec:1; |
f9ce1f1c KT |
1104 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
1105 | * execve */ | |
8f0dfc34 AV |
1106 | unsigned in_iowait:1; |
1107 | ||
259e5e6c AL |
1108 | /* task may not gain privileges */ |
1109 | unsigned no_new_privs:1; | |
ca94c442 LP |
1110 | |
1111 | /* Revert to default priority/policy when forking */ | |
1112 | unsigned sched_reset_on_fork:1; | |
a8e4f2ea | 1113 | unsigned sched_contributes_to_load:1; |
ca94c442 | 1114 | |
1da177e4 LT |
1115 | pid_t pid; |
1116 | pid_t tgid; | |
0a425405 | 1117 | |
1314562a | 1118 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
1119 | /* Canary value for the -fstack-protector gcc feature */ |
1120 | unsigned long stack_canary; | |
1314562a | 1121 | #endif |
4d1d61a6 | 1122 | /* |
1da177e4 | 1123 | * pointers to (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 1124 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 1125 | * p->real_parent->pid) |
1da177e4 | 1126 | */ |
abd63bc3 KC |
1127 | struct task_struct __rcu *real_parent; /* real parent process */ |
1128 | struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 1129 | /* |
f470021a | 1130 | * children/sibling forms the list of my natural children |
1da177e4 LT |
1131 | */ |
1132 | struct list_head children; /* list of my children */ | |
1133 | struct list_head sibling; /* linkage in my parent's children list */ | |
1134 | struct task_struct *group_leader; /* threadgroup leader */ | |
1135 | ||
f470021a RM |
1136 | /* |
1137 | * ptraced is the list of tasks this task is using ptrace on. | |
1138 | * This includes both natural children and PTRACE_ATTACH targets. | |
1139 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
1140 | */ | |
1141 | struct list_head ptraced; | |
1142 | struct list_head ptrace_entry; | |
1143 | ||
1da177e4 | 1144 | /* PID/PID hash table linkage. */ |
92476d7f | 1145 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1146 | struct list_head thread_group; |
1da177e4 LT |
1147 | |
1148 | struct completion *vfork_done; /* for vfork() */ | |
1149 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1150 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1151 | ||
c66f08be | 1152 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1153 | cputime_t gtime; |
9fbc42ea | 1154 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
d37f761d | 1155 | struct cputime prev_cputime; |
6a61671b FW |
1156 | #endif |
1157 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN | |
1158 | seqlock_t vtime_seqlock; | |
1159 | unsigned long long vtime_snap; | |
1160 | enum { | |
1161 | VTIME_SLEEPING = 0, | |
1162 | VTIME_USER, | |
1163 | VTIME_SYS, | |
1164 | } vtime_snap_whence; | |
d99ca3b9 | 1165 | #endif |
1da177e4 | 1166 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
924b42d5 TJ |
1167 | struct timespec start_time; /* monotonic time */ |
1168 | struct timespec real_start_time; /* boot based time */ | |
1da177e4 LT |
1169 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1170 | unsigned long min_flt, maj_flt; | |
1171 | ||
f06febc9 | 1172 | struct task_cputime cputime_expires; |
1da177e4 LT |
1173 | struct list_head cpu_timers[3]; |
1174 | ||
1175 | /* process credentials */ | |
1b0ba1c9 | 1176 | const struct cred __rcu *real_cred; /* objective and real subjective task |
3b11a1de | 1177 | * credentials (COW) */ |
1b0ba1c9 | 1178 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
3b11a1de | 1179 | * credentials (COW) */ |
36772092 PBG |
1180 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1181 | - access with [gs]et_task_comm (which lock | |
1182 | it with task_lock()) | |
221af7f8 | 1183 | - initialized normally by setup_new_exec */ |
1da177e4 LT |
1184 | /* file system info */ |
1185 | int link_count, total_link_count; | |
3d5b6fcc | 1186 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1187 | /* ipc stuff */ |
1188 | struct sysv_sem sysvsem; | |
3d5b6fcc | 1189 | #endif |
e162b39a | 1190 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 1191 | /* hung task detection */ |
82a1fcb9 IM |
1192 | unsigned long last_switch_count; |
1193 | #endif | |
1da177e4 LT |
1194 | /* CPU-specific state of this task */ |
1195 | struct thread_struct thread; | |
1196 | /* filesystem information */ | |
1197 | struct fs_struct *fs; | |
1198 | /* open file information */ | |
1199 | struct files_struct *files; | |
1651e14e | 1200 | /* namespaces */ |
ab516013 | 1201 | struct nsproxy *nsproxy; |
1da177e4 LT |
1202 | /* signal handlers */ |
1203 | struct signal_struct *signal; | |
1204 | struct sighand_struct *sighand; | |
1205 | ||
1206 | sigset_t blocked, real_blocked; | |
f3de272b | 1207 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
1208 | struct sigpending pending; |
1209 | ||
1210 | unsigned long sas_ss_sp; | |
1211 | size_t sas_ss_size; | |
1212 | int (*notifier)(void *priv); | |
1213 | void *notifier_data; | |
1214 | sigset_t *notifier_mask; | |
67d12145 | 1215 | struct callback_head *task_works; |
e73f8959 | 1216 | |
1da177e4 | 1217 | struct audit_context *audit_context; |
bfef93a5 | 1218 | #ifdef CONFIG_AUDITSYSCALL |
e1760bd5 | 1219 | kuid_t loginuid; |
4746ec5b | 1220 | unsigned int sessionid; |
bfef93a5 | 1221 | #endif |
932ecebb | 1222 | struct seccomp seccomp; |
1da177e4 LT |
1223 | |
1224 | /* Thread group tracking */ | |
1225 | u32 parent_exec_id; | |
1226 | u32 self_exec_id; | |
58568d2a MX |
1227 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1228 | * mempolicy */ | |
1da177e4 | 1229 | spinlock_t alloc_lock; |
1da177e4 | 1230 | |
b29739f9 | 1231 | /* Protection of the PI data structures: */ |
1d615482 | 1232 | raw_spinlock_t pi_lock; |
b29739f9 | 1233 | |
23f78d4a IM |
1234 | #ifdef CONFIG_RT_MUTEXES |
1235 | /* PI waiters blocked on a rt_mutex held by this task */ | |
1236 | struct plist_head pi_waiters; | |
1237 | /* Deadlock detection and priority inheritance handling */ | |
1238 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1239 | #endif |
1240 | ||
408894ee IM |
1241 | #ifdef CONFIG_DEBUG_MUTEXES |
1242 | /* mutex deadlock detection */ | |
1243 | struct mutex_waiter *blocked_on; | |
1244 | #endif | |
de30a2b3 IM |
1245 | #ifdef CONFIG_TRACE_IRQFLAGS |
1246 | unsigned int irq_events; | |
de30a2b3 | 1247 | unsigned long hardirq_enable_ip; |
de30a2b3 | 1248 | unsigned long hardirq_disable_ip; |
fa1452e8 | 1249 | unsigned int hardirq_enable_event; |
de30a2b3 | 1250 | unsigned int hardirq_disable_event; |
fa1452e8 HS |
1251 | int hardirqs_enabled; |
1252 | int hardirq_context; | |
de30a2b3 | 1253 | unsigned long softirq_disable_ip; |
de30a2b3 | 1254 | unsigned long softirq_enable_ip; |
fa1452e8 | 1255 | unsigned int softirq_disable_event; |
de30a2b3 | 1256 | unsigned int softirq_enable_event; |
fa1452e8 | 1257 | int softirqs_enabled; |
de30a2b3 IM |
1258 | int softirq_context; |
1259 | #endif | |
fbb9ce95 | 1260 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 1261 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
1262 | u64 curr_chain_key; |
1263 | int lockdep_depth; | |
fbb9ce95 | 1264 | unsigned int lockdep_recursion; |
c7aceaba | 1265 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 1266 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 1267 | #endif |
408894ee | 1268 | |
1da177e4 LT |
1269 | /* journalling filesystem info */ |
1270 | void *journal_info; | |
1271 | ||
d89d8796 | 1272 | /* stacked block device info */ |
bddd87c7 | 1273 | struct bio_list *bio_list; |
d89d8796 | 1274 | |
73c10101 JA |
1275 | #ifdef CONFIG_BLOCK |
1276 | /* stack plugging */ | |
1277 | struct blk_plug *plug; | |
1278 | #endif | |
1279 | ||
1da177e4 LT |
1280 | /* VM state */ |
1281 | struct reclaim_state *reclaim_state; | |
1282 | ||
1da177e4 LT |
1283 | struct backing_dev_info *backing_dev_info; |
1284 | ||
1285 | struct io_context *io_context; | |
1286 | ||
1287 | unsigned long ptrace_message; | |
1288 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 1289 | struct task_io_accounting ioac; |
8f0ab514 | 1290 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1291 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1292 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
49b5cf34 | 1293 | cputime_t acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
1294 | #endif |
1295 | #ifdef CONFIG_CPUSETS | |
58568d2a | 1296 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
cc9a6c87 | 1297 | seqcount_t mems_allowed_seq; /* Seqence no to catch updates */ |
825a46af | 1298 | int cpuset_mem_spread_rotor; |
6adef3eb | 1299 | int cpuset_slab_spread_rotor; |
1da177e4 | 1300 | #endif |
ddbcc7e8 | 1301 | #ifdef CONFIG_CGROUPS |
817929ec | 1302 | /* Control Group info protected by css_set_lock */ |
2c392b8c | 1303 | struct css_set __rcu *cgroups; |
817929ec PM |
1304 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
1305 | struct list_head cg_list; | |
ddbcc7e8 | 1306 | #endif |
42b2dd0a | 1307 | #ifdef CONFIG_FUTEX |
0771dfef | 1308 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1309 | #ifdef CONFIG_COMPAT |
1310 | struct compat_robust_list_head __user *compat_robust_list; | |
1311 | #endif | |
c87e2837 IM |
1312 | struct list_head pi_state_list; |
1313 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1314 | #endif |
cdd6c482 | 1315 | #ifdef CONFIG_PERF_EVENTS |
8dc85d54 | 1316 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
cdd6c482 IM |
1317 | struct mutex perf_event_mutex; |
1318 | struct list_head perf_event_list; | |
a63eaf34 | 1319 | #endif |
c7aceaba | 1320 | #ifdef CONFIG_NUMA |
58568d2a | 1321 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 1322 | short il_next; |
207205a2 | 1323 | short pref_node_fork; |
42b2dd0a | 1324 | #endif |
cbee9f88 PZ |
1325 | #ifdef CONFIG_NUMA_BALANCING |
1326 | int numa_scan_seq; | |
1327 | int numa_migrate_seq; | |
1328 | unsigned int numa_scan_period; | |
1329 | u64 node_stamp; /* migration stamp */ | |
1330 | struct callback_head numa_work; | |
1331 | #endif /* CONFIG_NUMA_BALANCING */ | |
1332 | ||
e56d0903 | 1333 | struct rcu_head rcu; |
b92ce558 JA |
1334 | |
1335 | /* | |
1336 | * cache last used pipe for splice | |
1337 | */ | |
1338 | struct pipe_inode_info *splice_pipe; | |
5640f768 ED |
1339 | |
1340 | struct page_frag task_frag; | |
1341 | ||
ca74e92b SN |
1342 | #ifdef CONFIG_TASK_DELAY_ACCT |
1343 | struct task_delay_info *delays; | |
f4f154fd AM |
1344 | #endif |
1345 | #ifdef CONFIG_FAULT_INJECTION | |
1346 | int make_it_fail; | |
ca74e92b | 1347 | #endif |
9d823e8f WF |
1348 | /* |
1349 | * when (nr_dirtied >= nr_dirtied_pause), it's time to call | |
1350 | * balance_dirty_pages() for some dirty throttling pause | |
1351 | */ | |
1352 | int nr_dirtied; | |
1353 | int nr_dirtied_pause; | |
83712358 | 1354 | unsigned long dirty_paused_when; /* start of a write-and-pause period */ |
9d823e8f | 1355 | |
9745512c AV |
1356 | #ifdef CONFIG_LATENCYTOP |
1357 | int latency_record_count; | |
1358 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1359 | #endif | |
6976675d AV |
1360 | /* |
1361 | * time slack values; these are used to round up poll() and | |
1362 | * select() etc timeout values. These are in nanoseconds. | |
1363 | */ | |
1364 | unsigned long timer_slack_ns; | |
1365 | unsigned long default_timer_slack_ns; | |
f8d570a4 | 1366 | |
fb52607a | 1367 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
3ad2f3fb | 1368 | /* Index of current stored address in ret_stack */ |
f201ae23 FW |
1369 | int curr_ret_stack; |
1370 | /* Stack of return addresses for return function tracing */ | |
1371 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
1372 | /* time stamp for last schedule */ |
1373 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
1374 | /* |
1375 | * Number of functions that haven't been traced | |
1376 | * because of depth overrun. | |
1377 | */ | |
1378 | atomic_t trace_overrun; | |
380c4b14 FW |
1379 | /* Pause for the tracing */ |
1380 | atomic_t tracing_graph_pause; | |
f201ae23 | 1381 | #endif |
ea4e2bc4 SR |
1382 | #ifdef CONFIG_TRACING |
1383 | /* state flags for use by tracers */ | |
1384 | unsigned long trace; | |
b1cff0ad | 1385 | /* bitmask and counter of trace recursion */ |
261842b7 SR |
1386 | unsigned long trace_recursion; |
1387 | #endif /* CONFIG_TRACING */ | |
c255a458 | 1388 | #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */ |
569b846d KH |
1389 | struct memcg_batch_info { |
1390 | int do_batch; /* incremented when batch uncharge started */ | |
1391 | struct mem_cgroup *memcg; /* target memcg of uncharge */ | |
7ffd4ca7 JW |
1392 | unsigned long nr_pages; /* uncharged usage */ |
1393 | unsigned long memsw_nr_pages; /* uncharged mem+swap usage */ | |
569b846d | 1394 | } memcg_batch; |
0e9d92f2 | 1395 | unsigned int memcg_kmem_skip_account; |
519e5247 | 1396 | struct memcg_oom_info { |
49426420 JW |
1397 | struct mem_cgroup *memcg; |
1398 | gfp_t gfp_mask; | |
1399 | int order; | |
519e5247 JW |
1400 | unsigned int may_oom:1; |
1401 | } memcg_oom; | |
569b846d | 1402 | #endif |
0326f5a9 SD |
1403 | #ifdef CONFIG_UPROBES |
1404 | struct uprobe_task *utask; | |
0326f5a9 | 1405 | #endif |
cafe5635 KO |
1406 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
1407 | unsigned int sequential_io; | |
1408 | unsigned int sequential_io_avg; | |
1409 | #endif | |
1da177e4 LT |
1410 | }; |
1411 | ||
76e6eee0 | 1412 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
a4636818 | 1413 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
76e6eee0 | 1414 | |
cbee9f88 | 1415 | #ifdef CONFIG_NUMA_BALANCING |
b8593bfd | 1416 | extern void task_numa_fault(int node, int pages, bool migrated); |
1a687c2e | 1417 | extern void set_numabalancing_state(bool enabled); |
cbee9f88 | 1418 | #else |
b8593bfd | 1419 | static inline void task_numa_fault(int node, int pages, bool migrated) |
cbee9f88 PZ |
1420 | { |
1421 | } | |
1a687c2e MG |
1422 | static inline void set_numabalancing_state(bool enabled) |
1423 | { | |
1424 | } | |
cbee9f88 PZ |
1425 | #endif |
1426 | ||
e868171a | 1427 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1428 | { |
1429 | return task->pids[PIDTYPE_PID].pid; | |
1430 | } | |
1431 | ||
e868171a | 1432 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1433 | { |
1434 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1435 | } | |
1436 | ||
6dda81f4 ON |
1437 | /* |
1438 | * Without tasklist or rcu lock it is not safe to dereference | |
1439 | * the result of task_pgrp/task_session even if task == current, | |
1440 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1441 | */ | |
e868171a | 1442 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1443 | { |
1444 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1445 | } | |
1446 | ||
e868171a | 1447 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1448 | { |
1449 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1450 | } | |
1451 | ||
7af57294 PE |
1452 | struct pid_namespace; |
1453 | ||
1454 | /* | |
1455 | * the helpers to get the task's different pids as they are seen | |
1456 | * from various namespaces | |
1457 | * | |
1458 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1459 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1460 | * current. | |
7af57294 PE |
1461 | * task_xid_nr_ns() : id seen from the ns specified; |
1462 | * | |
1463 | * set_task_vxid() : assigns a virtual id to a task; | |
1464 | * | |
7af57294 PE |
1465 | * see also pid_nr() etc in include/linux/pid.h |
1466 | */ | |
52ee2dfd ON |
1467 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1468 | struct pid_namespace *ns); | |
7af57294 | 1469 | |
e868171a | 1470 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1471 | { |
1472 | return tsk->pid; | |
1473 | } | |
1474 | ||
52ee2dfd ON |
1475 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1476 | struct pid_namespace *ns) | |
1477 | { | |
1478 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1479 | } | |
7af57294 PE |
1480 | |
1481 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1482 | { | |
52ee2dfd | 1483 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1484 | } |
1485 | ||
1486 | ||
e868171a | 1487 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1488 | { |
1489 | return tsk->tgid; | |
1490 | } | |
1491 | ||
2f2a3a46 | 1492 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1493 | |
1494 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1495 | { | |
1496 | return pid_vnr(task_tgid(tsk)); | |
1497 | } | |
1498 | ||
1499 | ||
52ee2dfd ON |
1500 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1501 | struct pid_namespace *ns) | |
7af57294 | 1502 | { |
52ee2dfd | 1503 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1504 | } |
1505 | ||
7af57294 PE |
1506 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1507 | { | |
52ee2dfd | 1508 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1509 | } |
1510 | ||
1511 | ||
52ee2dfd ON |
1512 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1513 | struct pid_namespace *ns) | |
7af57294 | 1514 | { |
52ee2dfd | 1515 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1516 | } |
1517 | ||
7af57294 PE |
1518 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1519 | { | |
52ee2dfd | 1520 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1521 | } |
1522 | ||
1b0f7ffd ON |
1523 | /* obsolete, do not use */ |
1524 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1525 | { | |
1526 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1527 | } | |
7af57294 | 1528 | |
1da177e4 LT |
1529 | /** |
1530 | * pid_alive - check that a task structure is not stale | |
1531 | * @p: Task structure to be checked. | |
1532 | * | |
1533 | * Test if a process is not yet dead (at most zombie state) | |
1534 | * If pid_alive fails, then pointers within the task structure | |
1535 | * can be stale and must not be dereferenced. | |
e69f6186 YB |
1536 | * |
1537 | * Return: 1 if the process is alive. 0 otherwise. | |
1da177e4 | 1538 | */ |
e868171a | 1539 | static inline int pid_alive(struct task_struct *p) |
1da177e4 | 1540 | { |
92476d7f | 1541 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1542 | } |
1543 | ||
f400e198 | 1544 | /** |
b460cbc5 | 1545 | * is_global_init - check if a task structure is init |
3260259f HK |
1546 | * @tsk: Task structure to be checked. |
1547 | * | |
1548 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
1549 | * |
1550 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 1551 | */ |
e868171a | 1552 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
1553 | { |
1554 | return tsk->pid == 1; | |
1555 | } | |
b460cbc5 | 1556 | |
9ec52099 CLG |
1557 | extern struct pid *cad_pid; |
1558 | ||
1da177e4 | 1559 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1560 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1561 | |
158d9ebd | 1562 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1563 | |
1564 | static inline void put_task_struct(struct task_struct *t) | |
1565 | { | |
1566 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1567 | __put_task_struct(t); |
e56d0903 | 1568 | } |
1da177e4 | 1569 | |
6a61671b FW |
1570 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
1571 | extern void task_cputime(struct task_struct *t, | |
1572 | cputime_t *utime, cputime_t *stime); | |
1573 | extern void task_cputime_scaled(struct task_struct *t, | |
1574 | cputime_t *utimescaled, cputime_t *stimescaled); | |
1575 | extern cputime_t task_gtime(struct task_struct *t); | |
1576 | #else | |
6fac4829 FW |
1577 | static inline void task_cputime(struct task_struct *t, |
1578 | cputime_t *utime, cputime_t *stime) | |
1579 | { | |
1580 | if (utime) | |
1581 | *utime = t->utime; | |
1582 | if (stime) | |
1583 | *stime = t->stime; | |
1584 | } | |
1585 | ||
1586 | static inline void task_cputime_scaled(struct task_struct *t, | |
1587 | cputime_t *utimescaled, | |
1588 | cputime_t *stimescaled) | |
1589 | { | |
1590 | if (utimescaled) | |
1591 | *utimescaled = t->utimescaled; | |
1592 | if (stimescaled) | |
1593 | *stimescaled = t->stimescaled; | |
1594 | } | |
6a61671b FW |
1595 | |
1596 | static inline cputime_t task_gtime(struct task_struct *t) | |
1597 | { | |
1598 | return t->gtime; | |
1599 | } | |
1600 | #endif | |
e80d0a1a FW |
1601 | extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); |
1602 | extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); | |
49048622 | 1603 | |
1da177e4 LT |
1604 | /* |
1605 | * Per process flags | |
1606 | */ | |
1da177e4 | 1607 | #define PF_EXITING 0x00000004 /* getting shut down */ |
778e9a9c | 1608 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1609 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
21aa9af0 | 1610 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1da177e4 | 1611 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
4db96cf0 | 1612 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1da177e4 LT |
1613 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
1614 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1615 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1616 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
72fa5997 | 1617 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */ |
1da177e4 | 1618 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
774a1221 | 1619 | #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */ |
1da177e4 LT |
1620 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1621 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1622 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1623 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
21caf2fc | 1624 | #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */ |
1da177e4 | 1625 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 1626 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
1627 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
1628 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
1629 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ | |
1630 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ | |
14a40ffc | 1631 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */ |
4db96cf0 | 1632 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
c61afb18 | 1633 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
61a87122 | 1634 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
58a69cb4 | 1635 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
2b44c4db | 1636 | #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */ |
1da177e4 LT |
1637 | |
1638 | /* | |
1639 | * Only the _current_ task can read/write to tsk->flags, but other | |
1640 | * tasks can access tsk->flags in readonly mode for example | |
1641 | * with tsk_used_math (like during threaded core dumping). | |
1642 | * There is however an exception to this rule during ptrace | |
1643 | * or during fork: the ptracer task is allowed to write to the | |
1644 | * child->flags of its traced child (same goes for fork, the parent | |
1645 | * can write to the child->flags), because we're guaranteed the | |
1646 | * child is not running and in turn not changing child->flags | |
1647 | * at the same time the parent does it. | |
1648 | */ | |
1649 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1650 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1651 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1652 | #define set_used_math() set_stopped_child_used_math(current) | |
1653 | #define conditional_stopped_child_used_math(condition, child) \ | |
1654 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1655 | #define conditional_used_math(condition) \ | |
1656 | conditional_stopped_child_used_math(condition, current) | |
1657 | #define copy_to_stopped_child_used_math(child) \ | |
1658 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1659 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1660 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1661 | #define used_math() tsk_used_math(current) | |
1662 | ||
21caf2fc ML |
1663 | /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags */ |
1664 | static inline gfp_t memalloc_noio_flags(gfp_t flags) | |
1665 | { | |
1666 | if (unlikely(current->flags & PF_MEMALLOC_NOIO)) | |
1667 | flags &= ~__GFP_IO; | |
1668 | return flags; | |
1669 | } | |
1670 | ||
1671 | static inline unsigned int memalloc_noio_save(void) | |
1672 | { | |
1673 | unsigned int flags = current->flags & PF_MEMALLOC_NOIO; | |
1674 | current->flags |= PF_MEMALLOC_NOIO; | |
1675 | return flags; | |
1676 | } | |
1677 | ||
1678 | static inline void memalloc_noio_restore(unsigned int flags) | |
1679 | { | |
1680 | current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags; | |
1681 | } | |
1682 | ||
e5c1902e | 1683 | /* |
a8f072c1 | 1684 | * task->jobctl flags |
e5c1902e | 1685 | */ |
a8f072c1 | 1686 | #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */ |
e5c1902e | 1687 | |
a8f072c1 TH |
1688 | #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */ |
1689 | #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */ | |
1690 | #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */ | |
73ddff2b | 1691 | #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */ |
fb1d910c | 1692 | #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */ |
a8f072c1 | 1693 | #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */ |
544b2c91 | 1694 | #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */ |
a8f072c1 TH |
1695 | |
1696 | #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT) | |
1697 | #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT) | |
1698 | #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT) | |
73ddff2b | 1699 | #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT) |
fb1d910c | 1700 | #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT) |
a8f072c1 | 1701 | #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT) |
544b2c91 | 1702 | #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT) |
a8f072c1 | 1703 | |
fb1d910c | 1704 | #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY) |
73ddff2b | 1705 | #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK) |
3759a0d9 | 1706 | |
7dd3db54 TH |
1707 | extern bool task_set_jobctl_pending(struct task_struct *task, |
1708 | unsigned int mask); | |
73ddff2b | 1709 | extern void task_clear_jobctl_trapping(struct task_struct *task); |
3759a0d9 TH |
1710 | extern void task_clear_jobctl_pending(struct task_struct *task, |
1711 | unsigned int mask); | |
39efa3ef | 1712 | |
a57eb940 | 1713 | #ifdef CONFIG_PREEMPT_RCU |
f41d911f PM |
1714 | |
1715 | #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ | |
1aa03f11 | 1716 | #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ |
f41d911f PM |
1717 | |
1718 | static inline void rcu_copy_process(struct task_struct *p) | |
1719 | { | |
1720 | p->rcu_read_lock_nesting = 0; | |
1721 | p->rcu_read_unlock_special = 0; | |
a57eb940 | 1722 | #ifdef CONFIG_TREE_PREEMPT_RCU |
dd5d19ba | 1723 | p->rcu_blocked_node = NULL; |
24278d14 PM |
1724 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
1725 | #ifdef CONFIG_RCU_BOOST | |
1726 | p->rcu_boost_mutex = NULL; | |
1727 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
f41d911f PM |
1728 | INIT_LIST_HEAD(&p->rcu_node_entry); |
1729 | } | |
1730 | ||
f41d911f PM |
1731 | #else |
1732 | ||
1733 | static inline void rcu_copy_process(struct task_struct *p) | |
1734 | { | |
1735 | } | |
1736 | ||
1737 | #endif | |
1738 | ||
907aed48 MG |
1739 | static inline void tsk_restore_flags(struct task_struct *task, |
1740 | unsigned long orig_flags, unsigned long flags) | |
1741 | { | |
1742 | task->flags &= ~flags; | |
1743 | task->flags |= orig_flags & flags; | |
1744 | } | |
1745 | ||
1da177e4 | 1746 | #ifdef CONFIG_SMP |
1e1b6c51 KM |
1747 | extern void do_set_cpus_allowed(struct task_struct *p, |
1748 | const struct cpumask *new_mask); | |
1749 | ||
cd8ba7cd | 1750 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1751 | const struct cpumask *new_mask); |
1da177e4 | 1752 | #else |
1e1b6c51 KM |
1753 | static inline void do_set_cpus_allowed(struct task_struct *p, |
1754 | const struct cpumask *new_mask) | |
1755 | { | |
1756 | } | |
cd8ba7cd | 1757 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1758 | const struct cpumask *new_mask) |
1da177e4 | 1759 | { |
96f874e2 | 1760 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1761 | return -EINVAL; |
1762 | return 0; | |
1763 | } | |
1764 | #endif | |
e0ad9556 | 1765 | |
3451d024 | 1766 | #ifdef CONFIG_NO_HZ_COMMON |
5167e8d5 PZ |
1767 | void calc_load_enter_idle(void); |
1768 | void calc_load_exit_idle(void); | |
1769 | #else | |
1770 | static inline void calc_load_enter_idle(void) { } | |
1771 | static inline void calc_load_exit_idle(void) { } | |
3451d024 | 1772 | #endif /* CONFIG_NO_HZ_COMMON */ |
5167e8d5 | 1773 | |
e0ad9556 | 1774 | #ifndef CONFIG_CPUMASK_OFFSTACK |
cd8ba7cd MT |
1775 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
1776 | { | |
1777 | return set_cpus_allowed_ptr(p, &new_mask); | |
1778 | } | |
e0ad9556 | 1779 | #endif |
1da177e4 | 1780 | |
b342501c | 1781 | /* |
c676329a PZ |
1782 | * Do not use outside of architecture code which knows its limitations. |
1783 | * | |
1784 | * sched_clock() has no promise of monotonicity or bounded drift between | |
1785 | * CPUs, use (which you should not) requires disabling IRQs. | |
1786 | * | |
1787 | * Please use one of the three interfaces below. | |
b342501c | 1788 | */ |
1bbfa6f2 | 1789 | extern unsigned long long notrace sched_clock(void); |
c676329a | 1790 | /* |
489a71b0 | 1791 | * See the comment in kernel/sched/clock.c |
c676329a PZ |
1792 | */ |
1793 | extern u64 cpu_clock(int cpu); | |
1794 | extern u64 local_clock(void); | |
1795 | extern u64 sched_clock_cpu(int cpu); | |
1796 | ||
e436d800 | 1797 | |
c1955a3d | 1798 | extern void sched_clock_init(void); |
3e51f33f | 1799 | |
c1955a3d | 1800 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
3e51f33f PZ |
1801 | static inline void sched_clock_tick(void) |
1802 | { | |
1803 | } | |
1804 | ||
1805 | static inline void sched_clock_idle_sleep_event(void) | |
1806 | { | |
1807 | } | |
1808 | ||
1809 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) | |
1810 | { | |
1811 | } | |
1812 | #else | |
c676329a PZ |
1813 | /* |
1814 | * Architectures can set this to 1 if they have specified | |
1815 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, | |
1816 | * but then during bootup it turns out that sched_clock() | |
1817 | * is reliable after all: | |
1818 | */ | |
1819 | extern int sched_clock_stable; | |
1820 | ||
3e51f33f PZ |
1821 | extern void sched_clock_tick(void); |
1822 | extern void sched_clock_idle_sleep_event(void); | |
1823 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
1824 | #endif | |
1825 | ||
b52bfee4 VP |
1826 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
1827 | /* | |
1828 | * An i/f to runtime opt-in for irq time accounting based off of sched_clock. | |
1829 | * The reason for this explicit opt-in is not to have perf penalty with | |
1830 | * slow sched_clocks. | |
1831 | */ | |
1832 | extern void enable_sched_clock_irqtime(void); | |
1833 | extern void disable_sched_clock_irqtime(void); | |
1834 | #else | |
1835 | static inline void enable_sched_clock_irqtime(void) {} | |
1836 | static inline void disable_sched_clock_irqtime(void) {} | |
1837 | #endif | |
1838 | ||
36c8b586 | 1839 | extern unsigned long long |
41b86e9c | 1840 | task_sched_runtime(struct task_struct *task); |
1da177e4 LT |
1841 | |
1842 | /* sched_exec is called by processes performing an exec */ | |
1843 | #ifdef CONFIG_SMP | |
1844 | extern void sched_exec(void); | |
1845 | #else | |
1846 | #define sched_exec() {} | |
1847 | #endif | |
1848 | ||
2aa44d05 IM |
1849 | extern void sched_clock_idle_sleep_event(void); |
1850 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 1851 | |
1da177e4 LT |
1852 | #ifdef CONFIG_HOTPLUG_CPU |
1853 | extern void idle_task_exit(void); | |
1854 | #else | |
1855 | static inline void idle_task_exit(void) {} | |
1856 | #endif | |
1857 | ||
3451d024 | 1858 | #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP) |
1c20091e | 1859 | extern void wake_up_nohz_cpu(int cpu); |
06d8308c | 1860 | #else |
1c20091e | 1861 | static inline void wake_up_nohz_cpu(int cpu) { } |
06d8308c TG |
1862 | #endif |
1863 | ||
ce831b38 FW |
1864 | #ifdef CONFIG_NO_HZ_FULL |
1865 | extern bool sched_can_stop_tick(void); | |
265f22a9 | 1866 | extern u64 scheduler_tick_max_deferment(void); |
ce831b38 FW |
1867 | #else |
1868 | static inline bool sched_can_stop_tick(void) { return false; } | |
06d8308c TG |
1869 | #endif |
1870 | ||
5091faa4 | 1871 | #ifdef CONFIG_SCHED_AUTOGROUP |
5091faa4 MG |
1872 | extern void sched_autogroup_create_attach(struct task_struct *p); |
1873 | extern void sched_autogroup_detach(struct task_struct *p); | |
1874 | extern void sched_autogroup_fork(struct signal_struct *sig); | |
1875 | extern void sched_autogroup_exit(struct signal_struct *sig); | |
1876 | #ifdef CONFIG_PROC_FS | |
1877 | extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); | |
2e5b5b3a | 1878 | extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice); |
5091faa4 MG |
1879 | #endif |
1880 | #else | |
1881 | static inline void sched_autogroup_create_attach(struct task_struct *p) { } | |
1882 | static inline void sched_autogroup_detach(struct task_struct *p) { } | |
1883 | static inline void sched_autogroup_fork(struct signal_struct *sig) { } | |
1884 | static inline void sched_autogroup_exit(struct signal_struct *sig) { } | |
1885 | #endif | |
1886 | ||
d95f4122 | 1887 | extern bool yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
1888 | extern void set_user_nice(struct task_struct *p, long nice); |
1889 | extern int task_prio(const struct task_struct *p); | |
1890 | extern int task_nice(const struct task_struct *p); | |
1891 | extern int can_nice(const struct task_struct *p, const int nice); | |
1892 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 1893 | extern int idle_cpu(int cpu); |
fe7de49f KM |
1894 | extern int sched_setscheduler(struct task_struct *, int, |
1895 | const struct sched_param *); | |
961ccddd | 1896 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
fe7de49f | 1897 | const struct sched_param *); |
36c8b586 | 1898 | extern struct task_struct *idle_task(int cpu); |
c4f30608 PM |
1899 | /** |
1900 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 1901 | * @p: the task in question. |
e69f6186 YB |
1902 | * |
1903 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 1904 | */ |
7061ca3b | 1905 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 PM |
1906 | { |
1907 | return p->pid == 0; | |
1908 | } | |
36c8b586 IM |
1909 | extern struct task_struct *curr_task(int cpu); |
1910 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
1911 | |
1912 | void yield(void); | |
1913 | ||
1914 | /* | |
1915 | * The default (Linux) execution domain. | |
1916 | */ | |
1917 | extern struct exec_domain default_exec_domain; | |
1918 | ||
1919 | union thread_union { | |
1920 | struct thread_info thread_info; | |
1921 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
1922 | }; | |
1923 | ||
1924 | #ifndef __HAVE_ARCH_KSTACK_END | |
1925 | static inline int kstack_end(void *addr) | |
1926 | { | |
1927 | /* Reliable end of stack detection: | |
1928 | * Some APM bios versions misalign the stack | |
1929 | */ | |
1930 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
1931 | } | |
1932 | #endif | |
1933 | ||
1934 | extern union thread_union init_thread_union; | |
1935 | extern struct task_struct init_task; | |
1936 | ||
1937 | extern struct mm_struct init_mm; | |
1938 | ||
198fe21b PE |
1939 | extern struct pid_namespace init_pid_ns; |
1940 | ||
1941 | /* | |
1942 | * find a task by one of its numerical ids | |
1943 | * | |
198fe21b PE |
1944 | * find_task_by_pid_ns(): |
1945 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
1946 | * find_task_by_vpid(): |
1947 | * finds a task by its virtual pid | |
198fe21b | 1948 | * |
e49859e7 | 1949 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
1950 | */ |
1951 | ||
228ebcbe PE |
1952 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
1953 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
1954 | struct pid_namespace *ns); | |
198fe21b | 1955 | |
1da177e4 | 1956 | /* per-UID process charging. */ |
7b44ab97 | 1957 | extern struct user_struct * alloc_uid(kuid_t); |
1da177e4 LT |
1958 | static inline struct user_struct *get_uid(struct user_struct *u) |
1959 | { | |
1960 | atomic_inc(&u->__count); | |
1961 | return u; | |
1962 | } | |
1963 | extern void free_uid(struct user_struct *); | |
1da177e4 LT |
1964 | |
1965 | #include <asm/current.h> | |
1966 | ||
f0af911a | 1967 | extern void xtime_update(unsigned long ticks); |
1da177e4 | 1968 | |
b3c97528 HH |
1969 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
1970 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 1971 | extern void wake_up_new_task(struct task_struct *tsk); |
1da177e4 LT |
1972 | #ifdef CONFIG_SMP |
1973 | extern void kick_process(struct task_struct *tsk); | |
1974 | #else | |
1975 | static inline void kick_process(struct task_struct *tsk) { } | |
1976 | #endif | |
3e51e3ed | 1977 | extern void sched_fork(struct task_struct *p); |
ad46c2c4 | 1978 | extern void sched_dead(struct task_struct *p); |
1da177e4 | 1979 | |
1da177e4 LT |
1980 | extern void proc_caches_init(void); |
1981 | extern void flush_signals(struct task_struct *); | |
3bcac026 | 1982 | extern void __flush_signals(struct task_struct *); |
10ab825b | 1983 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
1984 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
1985 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
1986 | ||
1987 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
1988 | { | |
1989 | unsigned long flags; | |
1990 | int ret; | |
1991 | ||
1992 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
1993 | ret = dequeue_signal(tsk, mask, info); | |
1994 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
1995 | ||
1996 | return ret; | |
53c8f9f1 | 1997 | } |
1da177e4 LT |
1998 | |
1999 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
2000 | sigset_t *mask); | |
2001 | extern void unblock_all_signals(void); | |
2002 | extern void release_task(struct task_struct * p); | |
2003 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1da177e4 LT |
2004 | extern int force_sigsegv(int, struct task_struct *); |
2005 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 | 2006 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
c4b92fc1 | 2007 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
d178bc3a SH |
2008 | extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *, |
2009 | const struct cred *, u32); | |
c4b92fc1 EB |
2010 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
2011 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 2012 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
86773473 | 2013 | extern __must_check bool do_notify_parent(struct task_struct *, int); |
a7f0765e | 2014 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); |
1da177e4 | 2015 | extern void force_sig(int, struct task_struct *); |
1da177e4 | 2016 | extern int send_sig(int, struct task_struct *, int); |
09faef11 | 2017 | extern int zap_other_threads(struct task_struct *p); |
1da177e4 LT |
2018 | extern struct sigqueue *sigqueue_alloc(void); |
2019 | extern void sigqueue_free(struct sigqueue *); | |
ac5c2153 | 2020 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
9ac95f2f | 2021 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 | 2022 | |
51a7b448 AV |
2023 | static inline void restore_saved_sigmask(void) |
2024 | { | |
2025 | if (test_and_clear_restore_sigmask()) | |
77097ae5 | 2026 | __set_current_blocked(¤t->saved_sigmask); |
51a7b448 AV |
2027 | } |
2028 | ||
b7f9a11a AV |
2029 | static inline sigset_t *sigmask_to_save(void) |
2030 | { | |
2031 | sigset_t *res = ¤t->blocked; | |
2032 | if (unlikely(test_restore_sigmask())) | |
2033 | res = ¤t->saved_sigmask; | |
2034 | return res; | |
2035 | } | |
2036 | ||
9ec52099 CLG |
2037 | static inline int kill_cad_pid(int sig, int priv) |
2038 | { | |
2039 | return kill_pid(cad_pid, sig, priv); | |
2040 | } | |
2041 | ||
1da177e4 LT |
2042 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
2043 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
2044 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
2045 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
2046 | ||
2a855dd0 SAS |
2047 | /* |
2048 | * True if we are on the alternate signal stack. | |
2049 | */ | |
1da177e4 LT |
2050 | static inline int on_sig_stack(unsigned long sp) |
2051 | { | |
2a855dd0 SAS |
2052 | #ifdef CONFIG_STACK_GROWSUP |
2053 | return sp >= current->sas_ss_sp && | |
2054 | sp - current->sas_ss_sp < current->sas_ss_size; | |
2055 | #else | |
2056 | return sp > current->sas_ss_sp && | |
2057 | sp - current->sas_ss_sp <= current->sas_ss_size; | |
2058 | #endif | |
1da177e4 LT |
2059 | } |
2060 | ||
2061 | static inline int sas_ss_flags(unsigned long sp) | |
2062 | { | |
2063 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
2064 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
2065 | } | |
2066 | ||
5a1b98d3 AV |
2067 | static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig) |
2068 | { | |
2069 | if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp)) | |
2070 | #ifdef CONFIG_STACK_GROWSUP | |
2071 | return current->sas_ss_sp; | |
2072 | #else | |
2073 | return current->sas_ss_sp + current->sas_ss_size; | |
2074 | #endif | |
2075 | return sp; | |
2076 | } | |
2077 | ||
1da177e4 LT |
2078 | /* |
2079 | * Routines for handling mm_structs | |
2080 | */ | |
2081 | extern struct mm_struct * mm_alloc(void); | |
2082 | ||
2083 | /* mmdrop drops the mm and the page tables */ | |
b3c97528 | 2084 | extern void __mmdrop(struct mm_struct *); |
1da177e4 LT |
2085 | static inline void mmdrop(struct mm_struct * mm) |
2086 | { | |
6fb43d7b | 2087 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
2088 | __mmdrop(mm); |
2089 | } | |
2090 | ||
2091 | /* mmput gets rid of the mappings and all user-space */ | |
2092 | extern void mmput(struct mm_struct *); | |
2093 | /* Grab a reference to a task's mm, if it is not already going away */ | |
2094 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
8cdb878d CY |
2095 | /* |
2096 | * Grab a reference to a task's mm, if it is not already going away | |
2097 | * and ptrace_may_access with the mode parameter passed to it | |
2098 | * succeeds. | |
2099 | */ | |
2100 | extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode); | |
1da177e4 LT |
2101 | /* Remove the current tasks stale references to the old mm_struct */ |
2102 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
402b0862 CO |
2103 | /* Allocate a new mm structure and copy contents from tsk->mm */ |
2104 | extern struct mm_struct *dup_mm(struct task_struct *tsk); | |
1da177e4 | 2105 | |
6f2c55b8 | 2106 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
afa86fc4 | 2107 | struct task_struct *); |
1da177e4 LT |
2108 | extern void flush_thread(void); |
2109 | extern void exit_thread(void); | |
2110 | ||
1da177e4 | 2111 | extern void exit_files(struct task_struct *); |
a7e5328a | 2112 | extern void __cleanup_sighand(struct sighand_struct *); |
cbaffba1 | 2113 | |
1da177e4 | 2114 | extern void exit_itimers(struct signal_struct *); |
cbaffba1 | 2115 | extern void flush_itimer_signals(void); |
1da177e4 | 2116 | |
9402c95f | 2117 | extern void do_group_exit(int); |
1da177e4 | 2118 | |
1da177e4 LT |
2119 | extern int allow_signal(int); |
2120 | extern int disallow_signal(int); | |
1da177e4 | 2121 | |
d7627467 DH |
2122 | extern int do_execve(const char *, |
2123 | const char __user * const __user *, | |
da3d4c5f | 2124 | const char __user * const __user *); |
e80d6661 | 2125 | extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *); |
36c8b586 | 2126 | struct task_struct *fork_idle(int); |
2aa3a7f8 | 2127 | extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
1da177e4 LT |
2128 | |
2129 | extern void set_task_comm(struct task_struct *tsk, char *from); | |
59714d65 | 2130 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
2131 | |
2132 | #ifdef CONFIG_SMP | |
317f3941 | 2133 | void scheduler_ipi(void); |
85ba2d86 | 2134 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 2135 | #else |
184748cc | 2136 | static inline void scheduler_ipi(void) { } |
85ba2d86 RM |
2137 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
2138 | long match_state) | |
2139 | { | |
2140 | return 1; | |
2141 | } | |
1da177e4 LT |
2142 | #endif |
2143 | ||
05725f7e JP |
2144 | #define next_task(p) \ |
2145 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
1da177e4 LT |
2146 | |
2147 | #define for_each_process(p) \ | |
2148 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
2149 | ||
5bb459bb | 2150 | extern bool current_is_single_threaded(void); |
d84f4f99 | 2151 | |
1da177e4 LT |
2152 | /* |
2153 | * Careful: do_each_thread/while_each_thread is a double loop so | |
2154 | * 'break' will not work as expected - use goto instead. | |
2155 | */ | |
2156 | #define do_each_thread(g, t) \ | |
2157 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
2158 | ||
2159 | #define while_each_thread(g, t) \ | |
2160 | while ((t = next_thread(t)) != g) | |
2161 | ||
7e49827c ON |
2162 | static inline int get_nr_threads(struct task_struct *tsk) |
2163 | { | |
b3ac022c | 2164 | return tsk->signal->nr_threads; |
7e49827c ON |
2165 | } |
2166 | ||
087806b1 ON |
2167 | static inline bool thread_group_leader(struct task_struct *p) |
2168 | { | |
2169 | return p->exit_signal >= 0; | |
2170 | } | |
1da177e4 | 2171 | |
0804ef4b EB |
2172 | /* Do to the insanities of de_thread it is possible for a process |
2173 | * to have the pid of the thread group leader without actually being | |
2174 | * the thread group leader. For iteration through the pids in proc | |
2175 | * all we care about is that we have a task with the appropriate | |
2176 | * pid, we don't actually care if we have the right task. | |
2177 | */ | |
e1403b8e | 2178 | static inline bool has_group_leader_pid(struct task_struct *p) |
0804ef4b | 2179 | { |
e1403b8e | 2180 | return task_pid(p) == p->signal->leader_pid; |
0804ef4b EB |
2181 | } |
2182 | ||
bac0abd6 | 2183 | static inline |
e1403b8e | 2184 | bool same_thread_group(struct task_struct *p1, struct task_struct *p2) |
bac0abd6 | 2185 | { |
e1403b8e | 2186 | return p1->signal == p2->signal; |
bac0abd6 PE |
2187 | } |
2188 | ||
36c8b586 | 2189 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 | 2190 | { |
05725f7e JP |
2191 | return list_entry_rcu(p->thread_group.next, |
2192 | struct task_struct, thread_group); | |
47e65328 ON |
2193 | } |
2194 | ||
e868171a | 2195 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 2196 | { |
47e65328 | 2197 | return list_empty(&p->thread_group); |
1da177e4 LT |
2198 | } |
2199 | ||
2200 | #define delay_group_leader(p) \ | |
2201 | (thread_group_leader(p) && !thread_group_empty(p)) | |
2202 | ||
1da177e4 | 2203 | /* |
260ea101 | 2204 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 2205 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 | 2206 | * pins the final release of task.io_context. Also protects ->cpuset and |
d68b46fe | 2207 | * ->cgroup.subsys[]. And ->vfork_done. |
1da177e4 LT |
2208 | * |
2209 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
2210 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
2211 | * neither inside nor outside. | |
2212 | */ | |
2213 | static inline void task_lock(struct task_struct *p) | |
2214 | { | |
2215 | spin_lock(&p->alloc_lock); | |
2216 | } | |
2217 | ||
2218 | static inline void task_unlock(struct task_struct *p) | |
2219 | { | |
2220 | spin_unlock(&p->alloc_lock); | |
2221 | } | |
2222 | ||
b8ed374e | 2223 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, |
f63ee72e ON |
2224 | unsigned long *flags); |
2225 | ||
9388dc30 AV |
2226 | static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
2227 | unsigned long *flags) | |
2228 | { | |
2229 | struct sighand_struct *ret; | |
2230 | ||
2231 | ret = __lock_task_sighand(tsk, flags); | |
2232 | (void)__cond_lock(&tsk->sighand->siglock, ret); | |
2233 | return ret; | |
2234 | } | |
b8ed374e | 2235 | |
f63ee72e ON |
2236 | static inline void unlock_task_sighand(struct task_struct *tsk, |
2237 | unsigned long *flags) | |
2238 | { | |
2239 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
2240 | } | |
2241 | ||
4714d1d3 | 2242 | #ifdef CONFIG_CGROUPS |
257058ae | 2243 | static inline void threadgroup_change_begin(struct task_struct *tsk) |
4714d1d3 | 2244 | { |
257058ae | 2245 | down_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2246 | } |
257058ae | 2247 | static inline void threadgroup_change_end(struct task_struct *tsk) |
4714d1d3 | 2248 | { |
257058ae | 2249 | up_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2250 | } |
77e4ef99 TH |
2251 | |
2252 | /** | |
2253 | * threadgroup_lock - lock threadgroup | |
2254 | * @tsk: member task of the threadgroup to lock | |
2255 | * | |
2256 | * Lock the threadgroup @tsk belongs to. No new task is allowed to enter | |
2257 | * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or | |
e56fb287 ON |
2258 | * change ->group_leader/pid. This is useful for cases where the threadgroup |
2259 | * needs to stay stable across blockable operations. | |
77e4ef99 TH |
2260 | * |
2261 | * fork and exit paths explicitly call threadgroup_change_{begin|end}() for | |
2262 | * synchronization. While held, no new task will be added to threadgroup | |
2263 | * and no existing live task will have its PF_EXITING set. | |
2264 | * | |
e56fb287 ON |
2265 | * de_thread() does threadgroup_change_{begin|end}() when a non-leader |
2266 | * sub-thread becomes a new leader. | |
77e4ef99 | 2267 | */ |
257058ae | 2268 | static inline void threadgroup_lock(struct task_struct *tsk) |
4714d1d3 | 2269 | { |
257058ae | 2270 | down_write(&tsk->signal->group_rwsem); |
4714d1d3 | 2271 | } |
77e4ef99 TH |
2272 | |
2273 | /** | |
2274 | * threadgroup_unlock - unlock threadgroup | |
2275 | * @tsk: member task of the threadgroup to unlock | |
2276 | * | |
2277 | * Reverse threadgroup_lock(). | |
2278 | */ | |
257058ae | 2279 | static inline void threadgroup_unlock(struct task_struct *tsk) |
4714d1d3 | 2280 | { |
257058ae | 2281 | up_write(&tsk->signal->group_rwsem); |
4714d1d3 BB |
2282 | } |
2283 | #else | |
257058ae TH |
2284 | static inline void threadgroup_change_begin(struct task_struct *tsk) {} |
2285 | static inline void threadgroup_change_end(struct task_struct *tsk) {} | |
2286 | static inline void threadgroup_lock(struct task_struct *tsk) {} | |
2287 | static inline void threadgroup_unlock(struct task_struct *tsk) {} | |
4714d1d3 BB |
2288 | #endif |
2289 | ||
f037360f AV |
2290 | #ifndef __HAVE_THREAD_FUNCTIONS |
2291 | ||
f7e4217b RZ |
2292 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
2293 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 2294 | |
10ebffde AV |
2295 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2296 | { | |
2297 | *task_thread_info(p) = *task_thread_info(org); | |
2298 | task_thread_info(p)->task = p; | |
2299 | } | |
2300 | ||
2301 | static inline unsigned long *end_of_stack(struct task_struct *p) | |
2302 | { | |
f7e4217b | 2303 | return (unsigned long *)(task_thread_info(p) + 1); |
10ebffde AV |
2304 | } |
2305 | ||
f037360f AV |
2306 | #endif |
2307 | ||
8b05c7e6 FT |
2308 | static inline int object_is_on_stack(void *obj) |
2309 | { | |
2310 | void *stack = task_stack_page(current); | |
2311 | ||
2312 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); | |
2313 | } | |
2314 | ||
8c9843e5 BH |
2315 | extern void thread_info_cache_init(void); |
2316 | ||
7c9f8861 ES |
2317 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2318 | static inline unsigned long stack_not_used(struct task_struct *p) | |
2319 | { | |
2320 | unsigned long *n = end_of_stack(p); | |
2321 | ||
2322 | do { /* Skip over canary */ | |
2323 | n++; | |
2324 | } while (!*n); | |
2325 | ||
2326 | return (unsigned long)n - (unsigned long)end_of_stack(p); | |
2327 | } | |
2328 | #endif | |
2329 | ||
1da177e4 LT |
2330 | /* set thread flags in other task's structures |
2331 | * - see asm/thread_info.h for TIF_xxxx flags available | |
2332 | */ | |
2333 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2334 | { | |
a1261f54 | 2335 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2336 | } |
2337 | ||
2338 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2339 | { | |
a1261f54 | 2340 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2341 | } |
2342 | ||
2343 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2344 | { | |
a1261f54 | 2345 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2346 | } |
2347 | ||
2348 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2349 | { | |
a1261f54 | 2350 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2351 | } |
2352 | ||
2353 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2354 | { | |
a1261f54 | 2355 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2356 | } |
2357 | ||
2358 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2359 | { | |
2360 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2361 | } | |
2362 | ||
2363 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2364 | { | |
2365 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2366 | } | |
2367 | ||
8ae121ac GH |
2368 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2369 | { | |
2370 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2371 | } | |
2372 | ||
690cc3ff EB |
2373 | static inline int restart_syscall(void) |
2374 | { | |
2375 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
2376 | return -ERESTARTNOINTR; | |
2377 | } | |
2378 | ||
1da177e4 LT |
2379 | static inline int signal_pending(struct task_struct *p) |
2380 | { | |
2381 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
2382 | } | |
f776d12d | 2383 | |
d9588725 RM |
2384 | static inline int __fatal_signal_pending(struct task_struct *p) |
2385 | { | |
2386 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
2387 | } | |
f776d12d MW |
2388 | |
2389 | static inline int fatal_signal_pending(struct task_struct *p) | |
2390 | { | |
2391 | return signal_pending(p) && __fatal_signal_pending(p); | |
2392 | } | |
2393 | ||
16882c1e ON |
2394 | static inline int signal_pending_state(long state, struct task_struct *p) |
2395 | { | |
2396 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
2397 | return 0; | |
2398 | if (!signal_pending(p)) | |
2399 | return 0; | |
2400 | ||
16882c1e ON |
2401 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2402 | } | |
2403 | ||
1da177e4 LT |
2404 | static inline int need_resched(void) |
2405 | { | |
9404ef02 | 2406 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
1da177e4 LT |
2407 | } |
2408 | ||
2409 | /* | |
2410 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2411 | * explicit rescheduling in places that are safe. The return | |
2412 | * value indicates whether a reschedule was done in fact. | |
2413 | * cond_resched_lock() will drop the spinlock before scheduling, | |
2414 | * cond_resched_softirq() will enable bhs before scheduling. | |
2415 | */ | |
c3921ab7 | 2416 | extern int _cond_resched(void); |
6f80bd98 | 2417 | |
613afbf8 FW |
2418 | #define cond_resched() ({ \ |
2419 | __might_sleep(__FILE__, __LINE__, 0); \ | |
2420 | _cond_resched(); \ | |
2421 | }) | |
6f80bd98 | 2422 | |
613afbf8 FW |
2423 | extern int __cond_resched_lock(spinlock_t *lock); |
2424 | ||
bdd4e85d | 2425 | #ifdef CONFIG_PREEMPT_COUNT |
716a4234 | 2426 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET |
02b67cc3 | 2427 | #else |
716a4234 | 2428 | #define PREEMPT_LOCK_OFFSET 0 |
02b67cc3 | 2429 | #endif |
716a4234 | 2430 | |
613afbf8 | 2431 | #define cond_resched_lock(lock) ({ \ |
716a4234 | 2432 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ |
613afbf8 FW |
2433 | __cond_resched_lock(lock); \ |
2434 | }) | |
2435 | ||
2436 | extern int __cond_resched_softirq(void); | |
2437 | ||
75e1056f VP |
2438 | #define cond_resched_softirq() ({ \ |
2439 | __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ | |
2440 | __cond_resched_softirq(); \ | |
613afbf8 | 2441 | }) |
1da177e4 | 2442 | |
f6f3c437 SH |
2443 | static inline void cond_resched_rcu(void) |
2444 | { | |
2445 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
2446 | rcu_read_unlock(); | |
2447 | cond_resched(); | |
2448 | rcu_read_lock(); | |
2449 | #endif | |
2450 | } | |
2451 | ||
1da177e4 LT |
2452 | /* |
2453 | * Does a critical section need to be broken due to another | |
95c354fe NP |
2454 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2455 | * but a general need for low latency) | |
1da177e4 | 2456 | */ |
95c354fe | 2457 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2458 | { |
95c354fe NP |
2459 | #ifdef CONFIG_PREEMPT |
2460 | return spin_is_contended(lock); | |
2461 | #else | |
1da177e4 | 2462 | return 0; |
95c354fe | 2463 | #endif |
1da177e4 LT |
2464 | } |
2465 | ||
ee761f62 TG |
2466 | /* |
2467 | * Idle thread specific functions to determine the need_resched | |
2468 | * polling state. We have two versions, one based on TS_POLLING in | |
2469 | * thread_info.status and one based on TIF_POLLING_NRFLAG in | |
2470 | * thread_info.flags | |
2471 | */ | |
2472 | #ifdef TS_POLLING | |
2473 | static inline int tsk_is_polling(struct task_struct *p) | |
2474 | { | |
2475 | return task_thread_info(p)->status & TS_POLLING; | |
2476 | } | |
3a98f871 TG |
2477 | static inline void current_set_polling(void) |
2478 | { | |
2479 | current_thread_info()->status |= TS_POLLING; | |
2480 | } | |
2481 | ||
2482 | static inline void current_clr_polling(void) | |
2483 | { | |
2484 | current_thread_info()->status &= ~TS_POLLING; | |
2485 | smp_mb__after_clear_bit(); | |
2486 | } | |
ee761f62 TG |
2487 | #elif defined(TIF_POLLING_NRFLAG) |
2488 | static inline int tsk_is_polling(struct task_struct *p) | |
2489 | { | |
2490 | return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG); | |
2491 | } | |
3a98f871 TG |
2492 | static inline void current_set_polling(void) |
2493 | { | |
2494 | set_thread_flag(TIF_POLLING_NRFLAG); | |
2495 | } | |
2496 | ||
2497 | static inline void current_clr_polling(void) | |
2498 | { | |
2499 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
2500 | } | |
ee761f62 TG |
2501 | #else |
2502 | static inline int tsk_is_polling(struct task_struct *p) { return 0; } | |
3a98f871 TG |
2503 | static inline void current_set_polling(void) { } |
2504 | static inline void current_clr_polling(void) { } | |
ee761f62 TG |
2505 | #endif |
2506 | ||
f06febc9 FM |
2507 | /* |
2508 | * Thread group CPU time accounting. | |
2509 | */ | |
4cd4c1b4 | 2510 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
4da94d49 | 2511 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
f06febc9 | 2512 | |
490dea45 | 2513 | static inline void thread_group_cputime_init(struct signal_struct *sig) |
f06febc9 | 2514 | { |
ee30a7b2 | 2515 | raw_spin_lock_init(&sig->cputimer.lock); |
f06febc9 FM |
2516 | } |
2517 | ||
7bb44ade RM |
2518 | /* |
2519 | * Reevaluate whether the task has signals pending delivery. | |
2520 | * Wake the task if so. | |
2521 | * This is required every time the blocked sigset_t changes. | |
2522 | * callers must hold sighand->siglock. | |
2523 | */ | |
2524 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
2525 | extern void recalc_sigpending(void); |
2526 | ||
910ffdb1 ON |
2527 | extern void signal_wake_up_state(struct task_struct *t, unsigned int state); |
2528 | ||
2529 | static inline void signal_wake_up(struct task_struct *t, bool resume) | |
2530 | { | |
2531 | signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0); | |
2532 | } | |
2533 | static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume) | |
2534 | { | |
2535 | signal_wake_up_state(t, resume ? __TASK_TRACED : 0); | |
2536 | } | |
1da177e4 LT |
2537 | |
2538 | /* | |
2539 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2540 | */ | |
2541 | #ifdef CONFIG_SMP | |
2542 | ||
2543 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2544 | { | |
a1261f54 | 2545 | return task_thread_info(p)->cpu; |
1da177e4 LT |
2546 | } |
2547 | ||
c65cc870 | 2548 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2549 | |
2550 | #else | |
2551 | ||
2552 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2553 | { | |
2554 | return 0; | |
2555 | } | |
2556 | ||
2557 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2558 | { | |
2559 | } | |
2560 | ||
2561 | #endif /* CONFIG_SMP */ | |
2562 | ||
96f874e2 RR |
2563 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2564 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2565 | |
7c941438 | 2566 | #ifdef CONFIG_CGROUP_SCHED |
07e06b01 | 2567 | extern struct task_group root_task_group; |
8323f26c | 2568 | #endif /* CONFIG_CGROUP_SCHED */ |
9b5b7751 | 2569 | |
54e99124 DG |
2570 | extern int task_can_switch_user(struct user_struct *up, |
2571 | struct task_struct *tsk); | |
2572 | ||
4b98d11b AD |
2573 | #ifdef CONFIG_TASK_XACCT |
2574 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2575 | { | |
940389b8 | 2576 | tsk->ioac.rchar += amt; |
4b98d11b AD |
2577 | } |
2578 | ||
2579 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2580 | { | |
940389b8 | 2581 | tsk->ioac.wchar += amt; |
4b98d11b AD |
2582 | } |
2583 | ||
2584 | static inline void inc_syscr(struct task_struct *tsk) | |
2585 | { | |
940389b8 | 2586 | tsk->ioac.syscr++; |
4b98d11b AD |
2587 | } |
2588 | ||
2589 | static inline void inc_syscw(struct task_struct *tsk) | |
2590 | { | |
940389b8 | 2591 | tsk->ioac.syscw++; |
4b98d11b AD |
2592 | } |
2593 | #else | |
2594 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2595 | { | |
2596 | } | |
2597 | ||
2598 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2599 | { | |
2600 | } | |
2601 | ||
2602 | static inline void inc_syscr(struct task_struct *tsk) | |
2603 | { | |
2604 | } | |
2605 | ||
2606 | static inline void inc_syscw(struct task_struct *tsk) | |
2607 | { | |
2608 | } | |
2609 | #endif | |
2610 | ||
82455257 DH |
2611 | #ifndef TASK_SIZE_OF |
2612 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2613 | #endif | |
2614 | ||
cf475ad2 BS |
2615 | #ifdef CONFIG_MM_OWNER |
2616 | extern void mm_update_next_owner(struct mm_struct *mm); | |
2617 | extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); | |
2618 | #else | |
2619 | static inline void mm_update_next_owner(struct mm_struct *mm) | |
2620 | { | |
2621 | } | |
2622 | ||
2623 | static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) | |
2624 | { | |
2625 | } | |
2626 | #endif /* CONFIG_MM_OWNER */ | |
2627 | ||
3e10e716 JS |
2628 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
2629 | unsigned int limit) | |
2630 | { | |
2631 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); | |
2632 | } | |
2633 | ||
2634 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, | |
2635 | unsigned int limit) | |
2636 | { | |
2637 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); | |
2638 | } | |
2639 | ||
2640 | static inline unsigned long rlimit(unsigned int limit) | |
2641 | { | |
2642 | return task_rlimit(current, limit); | |
2643 | } | |
2644 | ||
2645 | static inline unsigned long rlimit_max(unsigned int limit) | |
2646 | { | |
2647 | return task_rlimit_max(current, limit); | |
2648 | } | |
2649 | ||
1da177e4 | 2650 | #endif |