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Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_SCHED_H |
2 | #define _LINUX_SCHED_H | |
3 | ||
607ca46e | 4 | #include <uapi/linux/sched.h> |
b7b3c76a | 5 | |
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> |
a3b6714e DW |
54 | |
55 | #include <asm/processor.h> | |
36d57ac4 | 56 | |
1da177e4 | 57 | struct exec_domain; |
c87e2837 | 58 | struct futex_pi_state; |
286100a6 | 59 | struct robust_list_head; |
bddd87c7 | 60 | struct bio_list; |
5ad4e53b | 61 | struct fs_struct; |
cdd6c482 | 62 | struct perf_event_context; |
73c10101 | 63 | struct blk_plug; |
1da177e4 | 64 | |
1da177e4 LT |
65 | /* |
66 | * List of flags we want to share for kernel threads, | |
67 | * if only because they are not used by them anyway. | |
68 | */ | |
69 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) | |
70 | ||
71 | /* | |
72 | * These are the constant used to fake the fixed-point load-average | |
73 | * counting. Some notes: | |
74 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
75 | * a load-average precision of 10 bits integer + 11 bits fractional | |
76 | * - if you want to count load-averages more often, you need more | |
77 | * precision, or rounding will get you. With 2-second counting freq, | |
78 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
79 | * 11 bit fractions. | |
80 | */ | |
81 | extern unsigned long avenrun[]; /* Load averages */ | |
2d02494f | 82 | extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); |
1da177e4 LT |
83 | |
84 | #define FSHIFT 11 /* nr of bits of precision */ | |
85 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 86 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
87 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
88 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
89 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
90 | ||
91 | #define CALC_LOAD(load,exp,n) \ | |
92 | load *= exp; \ | |
93 | load += n*(FIXED_1-exp); \ | |
94 | load >>= FSHIFT; | |
95 | ||
96 | extern unsigned long total_forks; | |
97 | extern int nr_threads; | |
1da177e4 LT |
98 | DECLARE_PER_CPU(unsigned long, process_counts); |
99 | extern int nr_processes(void); | |
100 | extern unsigned long nr_running(void); | |
101 | extern unsigned long nr_uninterruptible(void); | |
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 | |
582b336e MT |
110 | /* Notifier for when a task gets migrated to a new CPU */ |
111 | struct task_migration_notifier { | |
112 | struct task_struct *task; | |
113 | int from_cpu; | |
114 | int to_cpu; | |
115 | }; | |
116 | extern void register_task_migration_notifier(struct notifier_block *n); | |
117 | ||
7e49fcce SR |
118 | extern unsigned long get_parent_ip(unsigned long addr); |
119 | ||
b637a328 PM |
120 | extern void dump_cpu_task(int cpu); |
121 | ||
43ae34cb IM |
122 | struct seq_file; |
123 | struct cfs_rq; | |
4cf86d77 | 124 | struct task_group; |
43ae34cb IM |
125 | #ifdef CONFIG_SCHED_DEBUG |
126 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
127 | extern void proc_sched_set_task(struct task_struct *p); | |
128 | extern void | |
5cef9eca | 129 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
43ae34cb IM |
130 | #else |
131 | static inline void | |
132 | proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
133 | { | |
134 | } | |
135 | static inline void proc_sched_set_task(struct task_struct *p) | |
136 | { | |
137 | } | |
138 | static inline void | |
5cef9eca | 139 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
43ae34cb IM |
140 | { |
141 | } | |
142 | #endif | |
1da177e4 | 143 | |
4a8342d2 LT |
144 | /* |
145 | * Task state bitmask. NOTE! These bits are also | |
146 | * encoded in fs/proc/array.c: get_task_state(). | |
147 | * | |
148 | * We have two separate sets of flags: task->state | |
149 | * is about runnability, while task->exit_state are | |
150 | * about the task exiting. Confusing, but this way | |
151 | * modifying one set can't modify the other one by | |
152 | * mistake. | |
153 | */ | |
1da177e4 LT |
154 | #define TASK_RUNNING 0 |
155 | #define TASK_INTERRUPTIBLE 1 | |
156 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
157 | #define __TASK_STOPPED 4 |
158 | #define __TASK_TRACED 8 | |
4a8342d2 LT |
159 | /* in tsk->exit_state */ |
160 | #define EXIT_ZOMBIE 16 | |
161 | #define EXIT_DEAD 32 | |
162 | /* in tsk->state again */ | |
af927232 | 163 | #define TASK_DEAD 64 |
f021a3c2 | 164 | #define TASK_WAKEKILL 128 |
e9c84311 | 165 | #define TASK_WAKING 256 |
e1781538 | 166 | #define TASK_STATE_MAX 512 |
f021a3c2 | 167 | |
44d90df6 | 168 | #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW" |
73342151 | 169 | |
e1781538 PZ |
170 | extern char ___assert_task_state[1 - 2*!!( |
171 | sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; | |
f021a3c2 MW |
172 | |
173 | /* Convenience macros for the sake of set_task_state */ | |
174 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
175 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
176 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 177 | |
92a1f4bc MW |
178 | /* Convenience macros for the sake of wake_up */ |
179 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 180 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
181 | |
182 | /* get_task_state() */ | |
183 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 MW |
184 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
185 | __TASK_TRACED) | |
92a1f4bc | 186 | |
f021a3c2 MW |
187 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
188 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
8f92054e | 189 | #define task_is_dead(task) ((task)->exit_state != 0) |
92a1f4bc | 190 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 191 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 192 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 193 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
376fede8 | 194 | (task->flags & PF_FROZEN) == 0) |
1da177e4 LT |
195 | |
196 | #define __set_task_state(tsk, state_value) \ | |
197 | do { (tsk)->state = (state_value); } while (0) | |
198 | #define set_task_state(tsk, state_value) \ | |
199 | set_mb((tsk)->state, (state_value)) | |
200 | ||
498d0c57 AM |
201 | /* |
202 | * set_current_state() includes a barrier so that the write of current->state | |
203 | * is correctly serialised wrt the caller's subsequent test of whether to | |
204 | * actually sleep: | |
205 | * | |
206 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
207 | * if (do_i_need_to_sleep()) | |
208 | * schedule(); | |
209 | * | |
210 | * If the caller does not need such serialisation then use __set_current_state() | |
211 | */ | |
1da177e4 LT |
212 | #define __set_current_state(state_value) \ |
213 | do { current->state = (state_value); } while (0) | |
214 | #define set_current_state(state_value) \ | |
215 | set_mb(current->state, (state_value)) | |
216 | ||
217 | /* Task command name length */ | |
218 | #define TASK_COMM_LEN 16 | |
219 | ||
1da177e4 LT |
220 | #include <linux/spinlock.h> |
221 | ||
222 | /* | |
223 | * This serializes "schedule()" and also protects | |
224 | * the run-queue from deletions/modifications (but | |
225 | * _adding_ to the beginning of the run-queue has | |
226 | * a separate lock). | |
227 | */ | |
228 | extern rwlock_t tasklist_lock; | |
229 | extern spinlock_t mmlist_lock; | |
230 | ||
36c8b586 | 231 | struct task_struct; |
1da177e4 | 232 | |
db1466b3 PM |
233 | #ifdef CONFIG_PROVE_RCU |
234 | extern int lockdep_tasklist_lock_is_held(void); | |
235 | #endif /* #ifdef CONFIG_PROVE_RCU */ | |
236 | ||
1da177e4 LT |
237 | extern void sched_init(void); |
238 | extern void sched_init_smp(void); | |
2d07b255 | 239 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
36c8b586 | 240 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 241 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 | 242 | |
89f19f04 | 243 | extern int runqueue_is_locked(int cpu); |
017730c1 | 244 | |
46cb4b7c | 245 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) |
c1cc017c | 246 | extern void nohz_balance_enter_idle(int cpu); |
69e1e811 | 247 | extern void set_cpu_sd_state_idle(void); |
83cd4fe2 | 248 | extern int get_nohz_timer_target(void); |
46cb4b7c | 249 | #else |
c1cc017c | 250 | static inline void nohz_balance_enter_idle(int cpu) { } |
fdaabd80 | 251 | static inline void set_cpu_sd_state_idle(void) { } |
46cb4b7c | 252 | #endif |
1da177e4 | 253 | |
e59e2ae2 | 254 | /* |
39bc89fd | 255 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
256 | */ |
257 | extern void show_state_filter(unsigned long state_filter); | |
258 | ||
259 | static inline void show_state(void) | |
260 | { | |
39bc89fd | 261 | show_state_filter(0); |
e59e2ae2 IM |
262 | } |
263 | ||
1da177e4 LT |
264 | extern void show_regs(struct pt_regs *); |
265 | ||
266 | /* | |
267 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
268 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
269 | * trace (or NULL if the entire call-chain of the task should be shown). | |
270 | */ | |
271 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
272 | ||
273 | void io_schedule(void); | |
274 | long io_schedule_timeout(long timeout); | |
275 | ||
276 | extern void cpu_init (void); | |
277 | extern void trap_init(void); | |
278 | extern void update_process_times(int user); | |
279 | extern void scheduler_tick(void); | |
280 | ||
82a1fcb9 IM |
281 | extern void sched_show_task(struct task_struct *p); |
282 | ||
19cc36c0 | 283 | #ifdef CONFIG_LOCKUP_DETECTOR |
8446f1d3 | 284 | extern void touch_softlockup_watchdog(void); |
d6ad3e28 | 285 | extern void touch_softlockup_watchdog_sync(void); |
04c9167f | 286 | extern void touch_all_softlockup_watchdogs(void); |
332fbdbc DZ |
287 | extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, |
288 | void __user *buffer, | |
289 | size_t *lenp, loff_t *ppos); | |
9c44bc03 | 290 | extern unsigned int softlockup_panic; |
004417a6 | 291 | void lockup_detector_init(void); |
8446f1d3 | 292 | #else |
8446f1d3 IM |
293 | static inline void touch_softlockup_watchdog(void) |
294 | { | |
295 | } | |
d6ad3e28 JW |
296 | static inline void touch_softlockup_watchdog_sync(void) |
297 | { | |
298 | } | |
04c9167f JF |
299 | static inline void touch_all_softlockup_watchdogs(void) |
300 | { | |
301 | } | |
004417a6 PZ |
302 | static inline void lockup_detector_init(void) |
303 | { | |
304 | } | |
8446f1d3 IM |
305 | #endif |
306 | ||
e162b39a MSB |
307 | #ifdef CONFIG_DETECT_HUNG_TASK |
308 | extern unsigned int sysctl_hung_task_panic; | |
309 | extern unsigned long sysctl_hung_task_check_count; | |
310 | extern unsigned long sysctl_hung_task_timeout_secs; | |
311 | extern unsigned long sysctl_hung_task_warnings; | |
312 | extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, | |
8d65af78 | 313 | void __user *buffer, |
e162b39a | 314 | size_t *lenp, loff_t *ppos); |
e4ecda1b ML |
315 | #else |
316 | /* Avoid need for ifdefs elsewhere in the code */ | |
317 | enum { sysctl_hung_task_timeout_secs = 0 }; | |
e162b39a | 318 | #endif |
8446f1d3 | 319 | |
1da177e4 LT |
320 | /* Attach to any functions which should be ignored in wchan output. */ |
321 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
322 | |
323 | /* Linker adds these: start and end of __sched functions */ | |
324 | extern char __sched_text_start[], __sched_text_end[]; | |
325 | ||
1da177e4 LT |
326 | /* Is this address in the __sched functions? */ |
327 | extern int in_sched_functions(unsigned long addr); | |
328 | ||
329 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
b3c97528 | 330 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 331 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 332 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 333 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
1da177e4 | 334 | asmlinkage void schedule(void); |
c5491ea7 | 335 | extern void schedule_preempt_disabled(void); |
c6eb3dda | 336 | extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner); |
1da177e4 | 337 | |
ab516013 | 338 | struct nsproxy; |
acce292c | 339 | struct user_namespace; |
1da177e4 | 340 | |
341c87bf KH |
341 | /* |
342 | * Default maximum number of active map areas, this limits the number of vmas | |
343 | * per mm struct. Users can overwrite this number by sysctl but there is a | |
344 | * problem. | |
345 | * | |
346 | * When a program's coredump is generated as ELF format, a section is created | |
347 | * per a vma. In ELF, the number of sections is represented in unsigned short. | |
348 | * This means the number of sections should be smaller than 65535 at coredump. | |
349 | * Because the kernel adds some informative sections to a image of program at | |
350 | * generating coredump, we need some margin. The number of extra sections is | |
351 | * 1-3 now and depends on arch. We use "5" as safe margin, here. | |
352 | */ | |
353 | #define MAPCOUNT_ELF_CORE_MARGIN (5) | |
4be929be | 354 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) |
1da177e4 LT |
355 | |
356 | extern int sysctl_max_map_count; | |
357 | ||
358 | #include <linux/aio.h> | |
359 | ||
efc1a3b1 DH |
360 | #ifdef CONFIG_MMU |
361 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1da177e4 LT |
362 | extern unsigned long |
363 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
364 | unsigned long, unsigned long); | |
365 | extern unsigned long | |
366 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
367 | unsigned long len, unsigned long pgoff, | |
368 | unsigned long flags); | |
1363c3cd WW |
369 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
370 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); | |
efc1a3b1 DH |
371 | #else |
372 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} | |
373 | #endif | |
1da177e4 | 374 | |
901608d9 | 375 | |
6c5d5238 KH |
376 | extern void set_dumpable(struct mm_struct *mm, int value); |
377 | extern int get_dumpable(struct mm_struct *mm); | |
378 | ||
54b50199 KC |
379 | /* get/set_dumpable() values */ |
380 | #define SUID_DUMPABLE_DISABLED 0 | |
381 | #define SUID_DUMPABLE_ENABLED 1 | |
382 | #define SUID_DUMPABLE_SAFE 2 | |
383 | ||
6c5d5238 | 384 | /* mm flags */ |
3cb4a0bb | 385 | /* dumpable bits */ |
6c5d5238 KH |
386 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
387 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ | |
f8af4da3 | 388 | |
3cb4a0bb | 389 | #define MMF_DUMPABLE_BITS 2 |
f8af4da3 | 390 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
3cb4a0bb KH |
391 | |
392 | /* coredump filter bits */ | |
393 | #define MMF_DUMP_ANON_PRIVATE 2 | |
394 | #define MMF_DUMP_ANON_SHARED 3 | |
395 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
396 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 397 | #define MMF_DUMP_ELF_HEADERS 6 |
e575f111 KM |
398 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
399 | #define MMF_DUMP_HUGETLB_SHARED 8 | |
f8af4da3 | 400 | |
3cb4a0bb | 401 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
e575f111 | 402 | #define MMF_DUMP_FILTER_BITS 7 |
3cb4a0bb KH |
403 | #define MMF_DUMP_FILTER_MASK \ |
404 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
405 | #define MMF_DUMP_FILTER_DEFAULT \ | |
e575f111 | 406 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
656eb2cd RM |
407 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
408 | ||
409 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS | |
410 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) | |
411 | #else | |
412 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 | |
413 | #endif | |
f8af4da3 HD |
414 | /* leave room for more dump flags */ |
415 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ | |
ba76149f | 416 | #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ |
bafb282d | 417 | #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */ |
f8af4da3 | 418 | |
9f68f672 ON |
419 | #define MMF_HAS_UPROBES 19 /* has uprobes */ |
420 | #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */ | |
f8ac4ec9 | 421 | |
f8af4da3 | 422 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) |
6c5d5238 | 423 | |
1da177e4 LT |
424 | struct sighand_struct { |
425 | atomic_t count; | |
426 | struct k_sigaction action[_NSIG]; | |
427 | spinlock_t siglock; | |
b8fceee1 | 428 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
429 | }; |
430 | ||
0e464814 | 431 | struct pacct_struct { |
f6ec29a4 KK |
432 | int ac_flag; |
433 | long ac_exitcode; | |
0e464814 | 434 | unsigned long ac_mem; |
77787bfb KK |
435 | cputime_t ac_utime, ac_stime; |
436 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
437 | }; |
438 | ||
42c4ab41 SG |
439 | struct cpu_itimer { |
440 | cputime_t expires; | |
441 | cputime_t incr; | |
8356b5f9 SG |
442 | u32 error; |
443 | u32 incr_error; | |
42c4ab41 SG |
444 | }; |
445 | ||
d37f761d FW |
446 | /** |
447 | * struct cputime - snaphsot of system and user cputime | |
448 | * @utime: time spent in user mode | |
449 | * @stime: time spent in system mode | |
450 | * | |
451 | * Gathers a generic snapshot of user and system time. | |
452 | */ | |
453 | struct cputime { | |
454 | cputime_t utime; | |
455 | cputime_t stime; | |
456 | }; | |
457 | ||
f06febc9 FM |
458 | /** |
459 | * struct task_cputime - collected CPU time counts | |
460 | * @utime: time spent in user mode, in &cputime_t units | |
461 | * @stime: time spent in kernel mode, in &cputime_t units | |
462 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds | |
5ce73a4a | 463 | * |
d37f761d FW |
464 | * This is an extension of struct cputime that includes the total runtime |
465 | * spent by the task from the scheduler point of view. | |
466 | * | |
467 | * As a result, this structure groups together three kinds of CPU time | |
468 | * that are tracked for threads and thread groups. Most things considering | |
f06febc9 FM |
469 | * CPU time want to group these counts together and treat all three |
470 | * of them in parallel. | |
471 | */ | |
472 | struct task_cputime { | |
473 | cputime_t utime; | |
474 | cputime_t stime; | |
475 | unsigned long long sum_exec_runtime; | |
476 | }; | |
477 | /* Alternate field names when used to cache expirations. */ | |
478 | #define prof_exp stime | |
479 | #define virt_exp utime | |
480 | #define sched_exp sum_exec_runtime | |
481 | ||
4cd4c1b4 PZ |
482 | #define INIT_CPUTIME \ |
483 | (struct task_cputime) { \ | |
64861634 MS |
484 | .utime = 0, \ |
485 | .stime = 0, \ | |
4cd4c1b4 PZ |
486 | .sum_exec_runtime = 0, \ |
487 | } | |
488 | ||
c99e6efe PZ |
489 | /* |
490 | * Disable preemption until the scheduler is running. | |
491 | * Reset by start_kernel()->sched_init()->init_idle(). | |
d86ee480 PZ |
492 | * |
493 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working | |
494 | * before the scheduler is active -- see should_resched(). | |
c99e6efe | 495 | */ |
d86ee480 | 496 | #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) |
c99e6efe | 497 | |
f06febc9 | 498 | /** |
4cd4c1b4 PZ |
499 | * struct thread_group_cputimer - thread group interval timer counts |
500 | * @cputime: thread group interval timers. | |
501 | * @running: non-zero when there are timers running and | |
502 | * @cputime receives updates. | |
503 | * @lock: lock for fields in this struct. | |
f06febc9 FM |
504 | * |
505 | * This structure contains the version of task_cputime, above, that is | |
4cd4c1b4 | 506 | * used for thread group CPU timer calculations. |
f06febc9 | 507 | */ |
4cd4c1b4 PZ |
508 | struct thread_group_cputimer { |
509 | struct task_cputime cputime; | |
510 | int running; | |
ee30a7b2 | 511 | raw_spinlock_t lock; |
f06febc9 | 512 | }; |
f06febc9 | 513 | |
4714d1d3 | 514 | #include <linux/rwsem.h> |
5091faa4 MG |
515 | struct autogroup; |
516 | ||
1da177e4 | 517 | /* |
e815f0a8 | 518 | * NOTE! "signal_struct" does not have its own |
1da177e4 LT |
519 | * locking, because a shared signal_struct always |
520 | * implies a shared sighand_struct, so locking | |
521 | * sighand_struct is always a proper superset of | |
522 | * the locking of signal_struct. | |
523 | */ | |
524 | struct signal_struct { | |
ea6d290c | 525 | atomic_t sigcnt; |
1da177e4 | 526 | atomic_t live; |
b3ac022c | 527 | int nr_threads; |
1da177e4 LT |
528 | |
529 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
530 | ||
531 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 532 | struct task_struct *curr_target; |
1da177e4 LT |
533 | |
534 | /* shared signal handling: */ | |
535 | struct sigpending shared_pending; | |
536 | ||
537 | /* thread group exit support */ | |
538 | int group_exit_code; | |
539 | /* overloaded: | |
540 | * - notify group_exit_task when ->count is equal to notify_count | |
541 | * - everyone except group_exit_task is stopped during signal delivery | |
542 | * of fatal signals, group_exit_task processes the signal. | |
543 | */ | |
1da177e4 | 544 | int notify_count; |
07dd20e0 | 545 | struct task_struct *group_exit_task; |
1da177e4 LT |
546 | |
547 | /* thread group stop support, overloads group_exit_code too */ | |
548 | int group_stop_count; | |
549 | unsigned int flags; /* see SIGNAL_* flags below */ | |
550 | ||
ebec18a6 LP |
551 | /* |
552 | * PR_SET_CHILD_SUBREAPER marks a process, like a service | |
553 | * manager, to re-parent orphan (double-forking) child processes | |
554 | * to this process instead of 'init'. The service manager is | |
555 | * able to receive SIGCHLD signals and is able to investigate | |
556 | * the process until it calls wait(). All children of this | |
557 | * process will inherit a flag if they should look for a | |
558 | * child_subreaper process at exit. | |
559 | */ | |
560 | unsigned int is_child_subreaper:1; | |
561 | unsigned int has_child_subreaper:1; | |
562 | ||
1da177e4 LT |
563 | /* POSIX.1b Interval Timers */ |
564 | struct list_head posix_timers; | |
565 | ||
566 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 567 | struct hrtimer real_timer; |
fea9d175 | 568 | struct pid *leader_pid; |
2ff678b8 | 569 | ktime_t it_real_incr; |
1da177e4 | 570 | |
42c4ab41 SG |
571 | /* |
572 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use | |
573 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these | |
574 | * values are defined to 0 and 1 respectively | |
575 | */ | |
576 | struct cpu_itimer it[2]; | |
1da177e4 | 577 | |
f06febc9 | 578 | /* |
4cd4c1b4 PZ |
579 | * Thread group totals for process CPU timers. |
580 | * See thread_group_cputimer(), et al, for details. | |
f06febc9 | 581 | */ |
4cd4c1b4 | 582 | struct thread_group_cputimer cputimer; |
f06febc9 FM |
583 | |
584 | /* Earliest-expiration cache. */ | |
585 | struct task_cputime cputime_expires; | |
586 | ||
587 | struct list_head cpu_timers[3]; | |
588 | ||
ab521dc0 | 589 | struct pid *tty_old_pgrp; |
1ec320af | 590 | |
1da177e4 LT |
591 | /* boolean value for session group leader */ |
592 | int leader; | |
593 | ||
594 | struct tty_struct *tty; /* NULL if no tty */ | |
595 | ||
5091faa4 MG |
596 | #ifdef CONFIG_SCHED_AUTOGROUP |
597 | struct autogroup *autogroup; | |
598 | #endif | |
1da177e4 LT |
599 | /* |
600 | * Cumulative resource counters for dead threads in the group, | |
601 | * and for reaped dead child processes forked by this group. | |
602 | * Live threads maintain their own counters and add to these | |
603 | * in __exit_signal, except for the group leader. | |
604 | */ | |
32bd671d | 605 | cputime_t utime, stime, cutime, cstime; |
9ac52315 LV |
606 | cputime_t gtime; |
607 | cputime_t cgtime; | |
0cf55e1e | 608 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
d37f761d | 609 | struct cputime prev_cputime; |
0cf55e1e | 610 | #endif |
1da177e4 LT |
611 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
612 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 613 | unsigned long inblock, oublock, cinblock, coublock; |
1f10206c | 614 | unsigned long maxrss, cmaxrss; |
940389b8 | 615 | struct task_io_accounting ioac; |
1da177e4 | 616 | |
32bd671d PZ |
617 | /* |
618 | * Cumulative ns of schedule CPU time fo dead threads in the | |
619 | * group, not including a zombie group leader, (This only differs | |
620 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
621 | * other than jiffies.) | |
622 | */ | |
623 | unsigned long long sum_sched_runtime; | |
624 | ||
1da177e4 LT |
625 | /* |
626 | * We don't bother to synchronize most readers of this at all, | |
627 | * because there is no reader checking a limit that actually needs | |
628 | * to get both rlim_cur and rlim_max atomically, and either one | |
629 | * alone is a single word that can safely be read normally. | |
630 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
631 | * protect this instead of the siglock, because they really | |
632 | * have no need to disable irqs. | |
633 | */ | |
634 | struct rlimit rlim[RLIM_NLIMITS]; | |
635 | ||
0e464814 KK |
636 | #ifdef CONFIG_BSD_PROCESS_ACCT |
637 | struct pacct_struct pacct; /* per-process accounting information */ | |
638 | #endif | |
ad4ecbcb | 639 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
640 | struct taskstats *stats; |
641 | #endif | |
522ed776 MT |
642 | #ifdef CONFIG_AUDIT |
643 | unsigned audit_tty; | |
644 | struct tty_audit_buf *tty_audit_buf; | |
645 | #endif | |
4714d1d3 BB |
646 | #ifdef CONFIG_CGROUPS |
647 | /* | |
77e4ef99 TH |
648 | * group_rwsem prevents new tasks from entering the threadgroup and |
649 | * member tasks from exiting,a more specifically, setting of | |
650 | * PF_EXITING. fork and exit paths are protected with this rwsem | |
651 | * using threadgroup_change_begin/end(). Users which require | |
652 | * threadgroup to remain stable should use threadgroup_[un]lock() | |
653 | * which also takes care of exec path. Currently, cgroup is the | |
654 | * only user. | |
4714d1d3 | 655 | */ |
257058ae | 656 | struct rw_semaphore group_rwsem; |
4714d1d3 | 657 | #endif |
28b83c51 | 658 | |
e1e12d2f | 659 | oom_flags_t oom_flags; |
a9c58b90 DR |
660 | short oom_score_adj; /* OOM kill score adjustment */ |
661 | short oom_score_adj_min; /* OOM kill score adjustment min value. | |
662 | * Only settable by CAP_SYS_RESOURCE. */ | |
9b1bf12d KM |
663 | |
664 | struct mutex cred_guard_mutex; /* guard against foreign influences on | |
665 | * credential calculations | |
666 | * (notably. ptrace) */ | |
1da177e4 LT |
667 | }; |
668 | ||
669 | /* | |
670 | * Bits in flags field of signal_struct. | |
671 | */ | |
672 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
ee77f075 ON |
673 | #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ |
674 | #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ | |
e4420551 ON |
675 | /* |
676 | * Pending notifications to parent. | |
677 | */ | |
678 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
679 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
680 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
1da177e4 | 681 | |
fae5fa44 ON |
682 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
683 | ||
ed5d2cac ON |
684 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
685 | static inline int signal_group_exit(const struct signal_struct *sig) | |
686 | { | |
687 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
688 | (sig->group_exit_task != NULL); | |
689 | } | |
690 | ||
1da177e4 LT |
691 | /* |
692 | * Some day this will be a full-fledged user tracking system.. | |
693 | */ | |
694 | struct user_struct { | |
695 | atomic_t __count; /* reference count */ | |
696 | atomic_t processes; /* How many processes does this user have? */ | |
697 | atomic_t files; /* How many open files does this user have? */ | |
698 | atomic_t sigpending; /* How many pending signals does this user have? */ | |
2d9048e2 | 699 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
700 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
701 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
702 | #endif | |
4afeff85 EP |
703 | #ifdef CONFIG_FANOTIFY |
704 | atomic_t fanotify_listeners; | |
705 | #endif | |
7ef9964e | 706 | #ifdef CONFIG_EPOLL |
52bd19f7 | 707 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
7ef9964e | 708 | #endif |
970a8645 | 709 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
710 | /* protected by mq_lock */ |
711 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 712 | #endif |
1da177e4 LT |
713 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
714 | ||
715 | #ifdef CONFIG_KEYS | |
716 | struct key *uid_keyring; /* UID specific keyring */ | |
717 | struct key *session_keyring; /* UID's default session keyring */ | |
718 | #endif | |
719 | ||
720 | /* Hash table maintenance information */ | |
735de223 | 721 | struct hlist_node uidhash_node; |
7b44ab97 | 722 | kuid_t uid; |
24e377a8 | 723 | |
cdd6c482 | 724 | #ifdef CONFIG_PERF_EVENTS |
789f90fc PZ |
725 | atomic_long_t locked_vm; |
726 | #endif | |
1da177e4 LT |
727 | }; |
728 | ||
eb41d946 | 729 | extern int uids_sysfs_init(void); |
5cb350ba | 730 | |
7b44ab97 | 731 | extern struct user_struct *find_user(kuid_t); |
1da177e4 LT |
732 | |
733 | extern struct user_struct root_user; | |
734 | #define INIT_USER (&root_user) | |
735 | ||
b6dff3ec | 736 | |
1da177e4 LT |
737 | struct backing_dev_info; |
738 | struct reclaim_state; | |
739 | ||
52f17b6c | 740 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
741 | struct sched_info { |
742 | /* cumulative counters */ | |
2d72376b | 743 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 744 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
745 | |
746 | /* timestamps */ | |
172ba844 BS |
747 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
748 | last_queued; /* when we were last queued to run */ | |
1da177e4 | 749 | }; |
52f17b6c | 750 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 751 | |
ca74e92b SN |
752 | #ifdef CONFIG_TASK_DELAY_ACCT |
753 | struct task_delay_info { | |
754 | spinlock_t lock; | |
755 | unsigned int flags; /* Private per-task flags */ | |
756 | ||
757 | /* For each stat XXX, add following, aligned appropriately | |
758 | * | |
759 | * struct timespec XXX_start, XXX_end; | |
760 | * u64 XXX_delay; | |
761 | * u32 XXX_count; | |
762 | * | |
763 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
764 | * single lock above (split into XXX_lock if contention is an issue). | |
765 | */ | |
0ff92245 SN |
766 | |
767 | /* | |
768 | * XXX_count is incremented on every XXX operation, the delay | |
769 | * associated with the operation is added to XXX_delay. | |
770 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
771 | */ | |
772 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ | |
773 | u64 blkio_delay; /* wait for sync block io completion */ | |
774 | u64 swapin_delay; /* wait for swapin block io completion */ | |
775 | u32 blkio_count; /* total count of the number of sync block */ | |
776 | /* io operations performed */ | |
777 | u32 swapin_count; /* total count of the number of swapin block */ | |
778 | /* io operations performed */ | |
873b4771 KK |
779 | |
780 | struct timespec freepages_start, freepages_end; | |
781 | u64 freepages_delay; /* wait for memory reclaim */ | |
782 | u32 freepages_count; /* total count of memory reclaim */ | |
ca74e92b | 783 | }; |
52f17b6c CS |
784 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
785 | ||
786 | static inline int sched_info_on(void) | |
787 | { | |
788 | #ifdef CONFIG_SCHEDSTATS | |
789 | return 1; | |
790 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
791 | extern int delayacct_on; | |
792 | return delayacct_on; | |
793 | #else | |
794 | return 0; | |
ca74e92b | 795 | #endif |
52f17b6c | 796 | } |
ca74e92b | 797 | |
d15bcfdb IM |
798 | enum cpu_idle_type { |
799 | CPU_IDLE, | |
800 | CPU_NOT_IDLE, | |
801 | CPU_NEWLY_IDLE, | |
802 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
803 | }; |
804 | ||
805 | /* | |
c8b28116 NR |
806 | * Increase resolution of nice-level calculations for 64-bit architectures. |
807 | * The extra resolution improves shares distribution and load balancing of | |
808 | * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup | |
809 | * hierarchies, especially on larger systems. This is not a user-visible change | |
810 | * and does not change the user-interface for setting shares/weights. | |
811 | * | |
812 | * We increase resolution only if we have enough bits to allow this increased | |
813 | * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution | |
814 | * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the | |
815 | * increased costs. | |
1da177e4 | 816 | */ |
e4c2fb0d | 817 | #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */ |
c8b28116 NR |
818 | # define SCHED_LOAD_RESOLUTION 10 |
819 | # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION) | |
820 | # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION) | |
821 | #else | |
822 | # define SCHED_LOAD_RESOLUTION 0 | |
823 | # define scale_load(w) (w) | |
824 | # define scale_load_down(w) (w) | |
825 | #endif | |
9aa7b369 | 826 | |
c8b28116 | 827 | #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION) |
9aa7b369 IM |
828 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) |
829 | ||
1399fa78 NR |
830 | /* |
831 | * Increase resolution of cpu_power calculations | |
832 | */ | |
833 | #define SCHED_POWER_SHIFT 10 | |
834 | #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT) | |
1da177e4 | 835 | |
1399fa78 NR |
836 | /* |
837 | * sched-domains (multiprocessor balancing) declarations: | |
838 | */ | |
2dd73a4f | 839 | #ifdef CONFIG_SMP |
b5d978e0 PZ |
840 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
841 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ | |
842 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ | |
843 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ | |
c88d5910 | 844 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
b5d978e0 | 845 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
b5d978e0 | 846 | #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ |
b5d978e0 PZ |
847 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ |
848 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ | |
532cb4c4 | 849 | #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ |
b5d978e0 | 850 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
e3589f6c | 851 | #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ |
5c45bf27 | 852 | |
532cb4c4 MN |
853 | extern int __weak arch_sd_sibiling_asym_packing(void); |
854 | ||
9c3f75cb | 855 | struct sched_group_power { |
e3589f6c | 856 | atomic_t ref; |
1da177e4 LT |
857 | /* |
858 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a | |
18a3885f | 859 | * single CPU. |
5517d86b | 860 | */ |
9c3f75cb | 861 | unsigned int power, power_orig; |
4ec4412e | 862 | unsigned long next_update; |
69e1e811 SS |
863 | /* |
864 | * Number of busy cpus in this group. | |
865 | */ | |
866 | atomic_t nr_busy_cpus; | |
c1174876 PZ |
867 | |
868 | unsigned long cpumask[0]; /* iteration mask */ | |
9c3f75cb PZ |
869 | }; |
870 | ||
871 | struct sched_group { | |
872 | struct sched_group *next; /* Must be a circular list */ | |
873 | atomic_t ref; | |
874 | ||
aae6d3dd | 875 | unsigned int group_weight; |
9c3f75cb | 876 | struct sched_group_power *sgp; |
6c99e9ad | 877 | |
4200efd9 IM |
878 | /* |
879 | * The CPUs this group covers. | |
880 | * | |
881 | * NOTE: this field is variable length. (Allocated dynamically | |
882 | * by attaching extra space to the end of the structure, | |
883 | * depending on how many CPUs the kernel has booted up with) | |
4200efd9 IM |
884 | */ |
885 | unsigned long cpumask[0]; | |
1da177e4 LT |
886 | }; |
887 | ||
758b2cdc RR |
888 | static inline struct cpumask *sched_group_cpus(struct sched_group *sg) |
889 | { | |
6c99e9ad | 890 | return to_cpumask(sg->cpumask); |
758b2cdc RR |
891 | } |
892 | ||
c1174876 PZ |
893 | /* |
894 | * cpumask masking which cpus in the group are allowed to iterate up the domain | |
895 | * tree. | |
896 | */ | |
897 | static inline struct cpumask *sched_group_mask(struct sched_group *sg) | |
898 | { | |
899 | return to_cpumask(sg->sgp->cpumask); | |
900 | } | |
901 | ||
029632fb PZ |
902 | /** |
903 | * group_first_cpu - Returns the first cpu in the cpumask of a sched_group. | |
904 | * @group: The group whose first cpu is to be returned. | |
905 | */ | |
906 | static inline unsigned int group_first_cpu(struct sched_group *group) | |
907 | { | |
908 | return cpumask_first(sched_group_cpus(group)); | |
909 | } | |
910 | ||
1d3504fc HS |
911 | struct sched_domain_attr { |
912 | int relax_domain_level; | |
913 | }; | |
914 | ||
915 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ | |
916 | .relax_domain_level = -1, \ | |
917 | } | |
918 | ||
60495e77 PZ |
919 | extern int sched_domain_level_max; |
920 | ||
1da177e4 LT |
921 | struct sched_domain { |
922 | /* These fields must be setup */ | |
923 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 924 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 | 925 | struct sched_group *groups; /* the balancing groups of the domain */ |
1da177e4 LT |
926 | unsigned long min_interval; /* Minimum balance interval ms */ |
927 | unsigned long max_interval; /* Maximum balance interval ms */ | |
928 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
929 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 930 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
931 | unsigned int busy_idx; |
932 | unsigned int idle_idx; | |
933 | unsigned int newidle_idx; | |
934 | unsigned int wake_idx; | |
147cbb4b | 935 | unsigned int forkexec_idx; |
a52bfd73 | 936 | unsigned int smt_gain; |
1da177e4 | 937 | int flags; /* See SD_* */ |
60495e77 | 938 | int level; |
1da177e4 LT |
939 | |
940 | /* Runtime fields. */ | |
941 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
942 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
943 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
944 | ||
2398f2c6 PZ |
945 | u64 last_update; |
946 | ||
1da177e4 LT |
947 | #ifdef CONFIG_SCHEDSTATS |
948 | /* load_balance() stats */ | |
480b9434 KC |
949 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
950 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; | |
951 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; | |
952 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; | |
953 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; | |
954 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; | |
955 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; | |
956 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; | |
1da177e4 LT |
957 | |
958 | /* Active load balancing */ | |
480b9434 KC |
959 | unsigned int alb_count; |
960 | unsigned int alb_failed; | |
961 | unsigned int alb_pushed; | |
1da177e4 | 962 | |
68767a0a | 963 | /* SD_BALANCE_EXEC stats */ |
480b9434 KC |
964 | unsigned int sbe_count; |
965 | unsigned int sbe_balanced; | |
966 | unsigned int sbe_pushed; | |
1da177e4 | 967 | |
68767a0a | 968 | /* SD_BALANCE_FORK stats */ |
480b9434 KC |
969 | unsigned int sbf_count; |
970 | unsigned int sbf_balanced; | |
971 | unsigned int sbf_pushed; | |
68767a0a | 972 | |
1da177e4 | 973 | /* try_to_wake_up() stats */ |
480b9434 KC |
974 | unsigned int ttwu_wake_remote; |
975 | unsigned int ttwu_move_affine; | |
976 | unsigned int ttwu_move_balance; | |
1da177e4 | 977 | #endif |
a5d8c348 IM |
978 | #ifdef CONFIG_SCHED_DEBUG |
979 | char *name; | |
980 | #endif | |
dce840a0 PZ |
981 | union { |
982 | void *private; /* used during construction */ | |
983 | struct rcu_head rcu; /* used during destruction */ | |
984 | }; | |
6c99e9ad | 985 | |
669c55e9 | 986 | unsigned int span_weight; |
4200efd9 IM |
987 | /* |
988 | * Span of all CPUs in this domain. | |
989 | * | |
990 | * NOTE: this field is variable length. (Allocated dynamically | |
991 | * by attaching extra space to the end of the structure, | |
992 | * depending on how many CPUs the kernel has booted up with) | |
4200efd9 IM |
993 | */ |
994 | unsigned long span[0]; | |
1da177e4 LT |
995 | }; |
996 | ||
758b2cdc RR |
997 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
998 | { | |
6c99e9ad | 999 | return to_cpumask(sd->span); |
758b2cdc RR |
1000 | } |
1001 | ||
acc3f5d7 | 1002 | extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1d3504fc | 1003 | struct sched_domain_attr *dattr_new); |
029190c5 | 1004 | |
acc3f5d7 RR |
1005 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
1006 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); | |
1007 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); | |
1008 | ||
06aaf76a IM |
1009 | /* Test a flag in parent sched domain */ |
1010 | static inline int test_sd_parent(struct sched_domain *sd, int flag) | |
1011 | { | |
1012 | if (sd->parent && (sd->parent->flags & flag)) | |
1013 | return 1; | |
1014 | ||
1015 | return 0; | |
1016 | } | |
029190c5 | 1017 | |
47fe38fc PZ |
1018 | unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); |
1019 | unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); | |
1020 | ||
39be3501 PZ |
1021 | bool cpus_share_cache(int this_cpu, int that_cpu); |
1022 | ||
1b427c15 | 1023 | #else /* CONFIG_SMP */ |
1da177e4 | 1024 | |
1b427c15 | 1025 | struct sched_domain_attr; |
d02c7a8c | 1026 | |
1b427c15 | 1027 | static inline void |
acc3f5d7 | 1028 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1b427c15 IM |
1029 | struct sched_domain_attr *dattr_new) |
1030 | { | |
d02c7a8c | 1031 | } |
39be3501 PZ |
1032 | |
1033 | static inline bool cpus_share_cache(int this_cpu, int that_cpu) | |
1034 | { | |
1035 | return true; | |
1036 | } | |
1037 | ||
1b427c15 | 1038 | #endif /* !CONFIG_SMP */ |
1da177e4 | 1039 | |
47fe38fc | 1040 | |
1da177e4 | 1041 | struct io_context; /* See blkdev.h */ |
1da177e4 | 1042 | |
1da177e4 | 1043 | |
383f2835 | 1044 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 1045 | extern void prefetch_stack(struct task_struct *t); |
383f2835 KC |
1046 | #else |
1047 | static inline void prefetch_stack(struct task_struct *t) { } | |
1048 | #endif | |
1da177e4 LT |
1049 | |
1050 | struct audit_context; /* See audit.c */ | |
1051 | struct mempolicy; | |
b92ce558 | 1052 | struct pipe_inode_info; |
4865ecf1 | 1053 | struct uts_namespace; |
1da177e4 | 1054 | |
20b8a59f IM |
1055 | struct rq; |
1056 | struct sched_domain; | |
1057 | ||
7d478721 PZ |
1058 | /* |
1059 | * wake flags | |
1060 | */ | |
1061 | #define WF_SYNC 0x01 /* waker goes to sleep after wakup */ | |
a7558e01 | 1062 | #define WF_FORK 0x02 /* child wakeup after fork */ |
f339b9dc | 1063 | #define WF_MIGRATED 0x04 /* internal use, task got migrated */ |
7d478721 | 1064 | |
371fd7e7 | 1065 | #define ENQUEUE_WAKEUP 1 |
74f8e4b2 PZ |
1066 | #define ENQUEUE_HEAD 2 |
1067 | #ifdef CONFIG_SMP | |
1068 | #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */ | |
1069 | #else | |
1070 | #define ENQUEUE_WAKING 0 | |
1071 | #endif | |
371fd7e7 PZ |
1072 | |
1073 | #define DEQUEUE_SLEEP 1 | |
1074 | ||
20b8a59f | 1075 | struct sched_class { |
5522d5d5 | 1076 | const struct sched_class *next; |
20b8a59f | 1077 | |
371fd7e7 PZ |
1078 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); |
1079 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); | |
4530d7ab | 1080 | void (*yield_task) (struct rq *rq); |
d95f4122 | 1081 | bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt); |
20b8a59f | 1082 | |
7d478721 | 1083 | void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); |
20b8a59f | 1084 | |
fb8d4724 | 1085 | struct task_struct * (*pick_next_task) (struct rq *rq); |
31ee529c | 1086 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
20b8a59f | 1087 | |
681f3e68 | 1088 | #ifdef CONFIG_SMP |
7608dec2 | 1089 | int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags); |
0a74bef8 | 1090 | void (*migrate_task_rq)(struct task_struct *p, int next_cpu); |
4ce72a2c | 1091 | |
9a897c5a SR |
1092 | void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); |
1093 | void (*post_schedule) (struct rq *this_rq); | |
74f8e4b2 | 1094 | void (*task_waking) (struct task_struct *task); |
efbbd05a | 1095 | void (*task_woken) (struct rq *this_rq, struct task_struct *task); |
e1d1484f | 1096 | |
cd8ba7cd | 1097 | void (*set_cpus_allowed)(struct task_struct *p, |
96f874e2 | 1098 | const struct cpumask *newmask); |
57d885fe | 1099 | |
1f11eb6a GH |
1100 | void (*rq_online)(struct rq *rq); |
1101 | void (*rq_offline)(struct rq *rq); | |
4ce72a2c LZ |
1102 | #endif |
1103 | ||
1104 | void (*set_curr_task) (struct rq *rq); | |
1105 | void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); | |
cd29fe6f | 1106 | void (*task_fork) (struct task_struct *p); |
cb469845 | 1107 | |
da7a735e PZ |
1108 | void (*switched_from) (struct rq *this_rq, struct task_struct *task); |
1109 | void (*switched_to) (struct rq *this_rq, struct task_struct *task); | |
cb469845 | 1110 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, |
da7a735e | 1111 | int oldprio); |
810b3817 | 1112 | |
dba091b9 TG |
1113 | unsigned int (*get_rr_interval) (struct rq *rq, |
1114 | struct task_struct *task); | |
0d721cea | 1115 | |
810b3817 | 1116 | #ifdef CONFIG_FAIR_GROUP_SCHED |
b2b5ce02 | 1117 | void (*task_move_group) (struct task_struct *p, int on_rq); |
810b3817 | 1118 | #endif |
20b8a59f IM |
1119 | }; |
1120 | ||
1121 | struct load_weight { | |
1122 | unsigned long weight, inv_weight; | |
1123 | }; | |
1124 | ||
9d85f21c PT |
1125 | struct sched_avg { |
1126 | /* | |
1127 | * These sums represent an infinite geometric series and so are bound | |
1128 | * above by 1024/(1-y). Thus we only need a u32 to store them for for all | |
1129 | * choices of y < 1-2^(-32)*1024. | |
1130 | */ | |
1131 | u32 runnable_avg_sum, runnable_avg_period; | |
1132 | u64 last_runnable_update; | |
9ee474f5 | 1133 | s64 decay_count; |
2dac754e | 1134 | unsigned long load_avg_contrib; |
9d85f21c PT |
1135 | }; |
1136 | ||
94c18227 | 1137 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 1138 | struct sched_statistics { |
20b8a59f | 1139 | u64 wait_start; |
94c18227 | 1140 | u64 wait_max; |
6d082592 AV |
1141 | u64 wait_count; |
1142 | u64 wait_sum; | |
8f0dfc34 AV |
1143 | u64 iowait_count; |
1144 | u64 iowait_sum; | |
94c18227 | 1145 | |
20b8a59f | 1146 | u64 sleep_start; |
20b8a59f | 1147 | u64 sleep_max; |
94c18227 IM |
1148 | s64 sum_sleep_runtime; |
1149 | ||
1150 | u64 block_start; | |
20b8a59f IM |
1151 | u64 block_max; |
1152 | u64 exec_max; | |
eba1ed4b | 1153 | u64 slice_max; |
cc367732 | 1154 | |
cc367732 IM |
1155 | u64 nr_migrations_cold; |
1156 | u64 nr_failed_migrations_affine; | |
1157 | u64 nr_failed_migrations_running; | |
1158 | u64 nr_failed_migrations_hot; | |
1159 | u64 nr_forced_migrations; | |
cc367732 IM |
1160 | |
1161 | u64 nr_wakeups; | |
1162 | u64 nr_wakeups_sync; | |
1163 | u64 nr_wakeups_migrate; | |
1164 | u64 nr_wakeups_local; | |
1165 | u64 nr_wakeups_remote; | |
1166 | u64 nr_wakeups_affine; | |
1167 | u64 nr_wakeups_affine_attempts; | |
1168 | u64 nr_wakeups_passive; | |
1169 | u64 nr_wakeups_idle; | |
41acab88 LDM |
1170 | }; |
1171 | #endif | |
1172 | ||
1173 | struct sched_entity { | |
1174 | struct load_weight load; /* for load-balancing */ | |
1175 | struct rb_node run_node; | |
1176 | struct list_head group_node; | |
1177 | unsigned int on_rq; | |
1178 | ||
1179 | u64 exec_start; | |
1180 | u64 sum_exec_runtime; | |
1181 | u64 vruntime; | |
1182 | u64 prev_sum_exec_runtime; | |
1183 | ||
41acab88 LDM |
1184 | u64 nr_migrations; |
1185 | ||
41acab88 LDM |
1186 | #ifdef CONFIG_SCHEDSTATS |
1187 | struct sched_statistics statistics; | |
94c18227 IM |
1188 | #endif |
1189 | ||
20b8a59f IM |
1190 | #ifdef CONFIG_FAIR_GROUP_SCHED |
1191 | struct sched_entity *parent; | |
1192 | /* rq on which this entity is (to be) queued: */ | |
1193 | struct cfs_rq *cfs_rq; | |
1194 | /* rq "owned" by this entity/group: */ | |
1195 | struct cfs_rq *my_q; | |
1196 | #endif | |
f4e26b12 PT |
1197 | /* |
1198 | * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be | |
1199 | * removed when useful for applications beyond shares distribution (e.g. | |
1200 | * load-balance). | |
1201 | */ | |
1202 | #if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED) | |
1203 | /* Per-entity load-tracking */ | |
9d85f21c PT |
1204 | struct sched_avg avg; |
1205 | #endif | |
20b8a59f | 1206 | }; |
70b97a7f | 1207 | |
fa717060 PZ |
1208 | struct sched_rt_entity { |
1209 | struct list_head run_list; | |
78f2c7db | 1210 | unsigned long timeout; |
bee367ed | 1211 | unsigned int time_slice; |
6f505b16 | 1212 | |
58d6c2d7 | 1213 | struct sched_rt_entity *back; |
052f1dc7 | 1214 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
1215 | struct sched_rt_entity *parent; |
1216 | /* rq on which this entity is (to be) queued: */ | |
1217 | struct rt_rq *rt_rq; | |
1218 | /* rq "owned" by this entity/group: */ | |
1219 | struct rt_rq *my_q; | |
1220 | #endif | |
fa717060 PZ |
1221 | }; |
1222 | ||
de5bdff7 HS |
1223 | /* |
1224 | * default timeslice is 100 msecs (used only for SCHED_RR tasks). | |
1225 | * Timeslices get refilled after they expire. | |
1226 | */ | |
1227 | #define RR_TIMESLICE (100 * HZ / 1000) | |
1228 | ||
86848966 PM |
1229 | struct rcu_node; |
1230 | ||
8dc85d54 PZ |
1231 | enum perf_event_task_context { |
1232 | perf_invalid_context = -1, | |
1233 | perf_hw_context = 0, | |
89a1e187 | 1234 | perf_sw_context, |
8dc85d54 PZ |
1235 | perf_nr_task_contexts, |
1236 | }; | |
1237 | ||
1da177e4 LT |
1238 | struct task_struct { |
1239 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 1240 | void *stack; |
1da177e4 | 1241 | atomic_t usage; |
97dc32cd WC |
1242 | unsigned int flags; /* per process flags, defined below */ |
1243 | unsigned int ptrace; | |
1da177e4 | 1244 | |
2dd73a4f | 1245 | #ifdef CONFIG_SMP |
fa14ff4a | 1246 | struct llist_node wake_entry; |
3ca7a440 | 1247 | int on_cpu; |
2dd73a4f | 1248 | #endif |
fd2f4419 | 1249 | int on_rq; |
50e645a8 | 1250 | |
b29739f9 | 1251 | int prio, static_prio, normal_prio; |
c7aceaba | 1252 | unsigned int rt_priority; |
5522d5d5 | 1253 | const struct sched_class *sched_class; |
20b8a59f | 1254 | struct sched_entity se; |
fa717060 | 1255 | struct sched_rt_entity rt; |
8323f26c PZ |
1256 | #ifdef CONFIG_CGROUP_SCHED |
1257 | struct task_group *sched_task_group; | |
1258 | #endif | |
1da177e4 | 1259 | |
e107be36 AK |
1260 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1261 | /* list of struct preempt_notifier: */ | |
1262 | struct hlist_head preempt_notifiers; | |
1263 | #endif | |
1264 | ||
18796aa0 AD |
1265 | /* |
1266 | * fpu_counter contains the number of consecutive context switches | |
1267 | * that the FPU is used. If this is over a threshold, the lazy fpu | |
1268 | * saving becomes unlazy to save the trap. This is an unsigned char | |
1269 | * so that after 256 times the counter wraps and the behavior turns | |
1270 | * lazy again; this to deal with bursty apps that only use FPU for | |
1271 | * a short time | |
1272 | */ | |
1273 | unsigned char fpu_counter; | |
6c5c9341 | 1274 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 1275 | unsigned int btrace_seq; |
6c5c9341 | 1276 | #endif |
1da177e4 | 1277 | |
97dc32cd | 1278 | unsigned int policy; |
29baa747 | 1279 | int nr_cpus_allowed; |
1da177e4 | 1280 | cpumask_t cpus_allowed; |
1da177e4 | 1281 | |
a57eb940 | 1282 | #ifdef CONFIG_PREEMPT_RCU |
e260be67 | 1283 | int rcu_read_lock_nesting; |
f41d911f | 1284 | char rcu_read_unlock_special; |
f41d911f | 1285 | struct list_head rcu_node_entry; |
a57eb940 PM |
1286 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
1287 | #ifdef CONFIG_TREE_PREEMPT_RCU | |
1288 | struct rcu_node *rcu_blocked_node; | |
f41d911f | 1289 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
24278d14 PM |
1290 | #ifdef CONFIG_RCU_BOOST |
1291 | struct rt_mutex *rcu_boost_mutex; | |
1292 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
e260be67 | 1293 | |
52f17b6c | 1294 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
1295 | struct sched_info sched_info; |
1296 | #endif | |
1297 | ||
1298 | struct list_head tasks; | |
806c09a7 | 1299 | #ifdef CONFIG_SMP |
917b627d | 1300 | struct plist_node pushable_tasks; |
806c09a7 | 1301 | #endif |
1da177e4 LT |
1302 | |
1303 | struct mm_struct *mm, *active_mm; | |
4471a675 JK |
1304 | #ifdef CONFIG_COMPAT_BRK |
1305 | unsigned brk_randomized:1; | |
1306 | #endif | |
34e55232 KH |
1307 | #if defined(SPLIT_RSS_COUNTING) |
1308 | struct task_rss_stat rss_stat; | |
1309 | #endif | |
1da177e4 | 1310 | /* task state */ |
97dc32cd | 1311 | int exit_state; |
1da177e4 LT |
1312 | int exit_code, exit_signal; |
1313 | int pdeath_signal; /* The signal sent when the parent dies */ | |
a8f072c1 | 1314 | unsigned int jobctl; /* JOBCTL_*, siglock protected */ |
1da177e4 | 1315 | /* ??? */ |
97dc32cd | 1316 | unsigned int personality; |
1da177e4 | 1317 | unsigned did_exec:1; |
f9ce1f1c KT |
1318 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
1319 | * execve */ | |
8f0dfc34 AV |
1320 | unsigned in_iowait:1; |
1321 | ||
259e5e6c AL |
1322 | /* task may not gain privileges */ |
1323 | unsigned no_new_privs:1; | |
ca94c442 LP |
1324 | |
1325 | /* Revert to default priority/policy when forking */ | |
1326 | unsigned sched_reset_on_fork:1; | |
a8e4f2ea | 1327 | unsigned sched_contributes_to_load:1; |
ca94c442 | 1328 | |
1da177e4 LT |
1329 | pid_t pid; |
1330 | pid_t tgid; | |
0a425405 | 1331 | |
1314562a | 1332 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
1333 | /* Canary value for the -fstack-protector gcc feature */ |
1334 | unsigned long stack_canary; | |
1314562a | 1335 | #endif |
4d1d61a6 | 1336 | /* |
1da177e4 | 1337 | * pointers to (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 1338 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 1339 | * p->real_parent->pid) |
1da177e4 | 1340 | */ |
abd63bc3 KC |
1341 | struct task_struct __rcu *real_parent; /* real parent process */ |
1342 | struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 1343 | /* |
f470021a | 1344 | * children/sibling forms the list of my natural children |
1da177e4 LT |
1345 | */ |
1346 | struct list_head children; /* list of my children */ | |
1347 | struct list_head sibling; /* linkage in my parent's children list */ | |
1348 | struct task_struct *group_leader; /* threadgroup leader */ | |
1349 | ||
f470021a RM |
1350 | /* |
1351 | * ptraced is the list of tasks this task is using ptrace on. | |
1352 | * This includes both natural children and PTRACE_ATTACH targets. | |
1353 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
1354 | */ | |
1355 | struct list_head ptraced; | |
1356 | struct list_head ptrace_entry; | |
1357 | ||
1da177e4 | 1358 | /* PID/PID hash table linkage. */ |
92476d7f | 1359 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1360 | struct list_head thread_group; |
1da177e4 LT |
1361 | |
1362 | struct completion *vfork_done; /* for vfork() */ | |
1363 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1364 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1365 | ||
c66f08be | 1366 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1367 | cputime_t gtime; |
d99ca3b9 | 1368 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
d37f761d | 1369 | struct cputime prev_cputime; |
d99ca3b9 | 1370 | #endif |
1da177e4 | 1371 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
924b42d5 TJ |
1372 | struct timespec start_time; /* monotonic time */ |
1373 | struct timespec real_start_time; /* boot based time */ | |
1da177e4 LT |
1374 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1375 | unsigned long min_flt, maj_flt; | |
1376 | ||
f06febc9 | 1377 | struct task_cputime cputime_expires; |
1da177e4 LT |
1378 | struct list_head cpu_timers[3]; |
1379 | ||
1380 | /* process credentials */ | |
1b0ba1c9 | 1381 | const struct cred __rcu *real_cred; /* objective and real subjective task |
3b11a1de | 1382 | * credentials (COW) */ |
1b0ba1c9 | 1383 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
3b11a1de | 1384 | * credentials (COW) */ |
36772092 PBG |
1385 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1386 | - access with [gs]et_task_comm (which lock | |
1387 | it with task_lock()) | |
221af7f8 | 1388 | - initialized normally by setup_new_exec */ |
1da177e4 LT |
1389 | /* file system info */ |
1390 | int link_count, total_link_count; | |
3d5b6fcc | 1391 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1392 | /* ipc stuff */ |
1393 | struct sysv_sem sysvsem; | |
3d5b6fcc | 1394 | #endif |
e162b39a | 1395 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 1396 | /* hung task detection */ |
82a1fcb9 IM |
1397 | unsigned long last_switch_count; |
1398 | #endif | |
1da177e4 LT |
1399 | /* CPU-specific state of this task */ |
1400 | struct thread_struct thread; | |
1401 | /* filesystem information */ | |
1402 | struct fs_struct *fs; | |
1403 | /* open file information */ | |
1404 | struct files_struct *files; | |
1651e14e | 1405 | /* namespaces */ |
ab516013 | 1406 | struct nsproxy *nsproxy; |
1da177e4 LT |
1407 | /* signal handlers */ |
1408 | struct signal_struct *signal; | |
1409 | struct sighand_struct *sighand; | |
1410 | ||
1411 | sigset_t blocked, real_blocked; | |
f3de272b | 1412 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
1413 | struct sigpending pending; |
1414 | ||
1415 | unsigned long sas_ss_sp; | |
1416 | size_t sas_ss_size; | |
1417 | int (*notifier)(void *priv); | |
1418 | void *notifier_data; | |
1419 | sigset_t *notifier_mask; | |
67d12145 | 1420 | struct callback_head *task_works; |
e73f8959 | 1421 | |
1da177e4 | 1422 | struct audit_context *audit_context; |
bfef93a5 | 1423 | #ifdef CONFIG_AUDITSYSCALL |
e1760bd5 | 1424 | kuid_t loginuid; |
4746ec5b | 1425 | unsigned int sessionid; |
bfef93a5 | 1426 | #endif |
932ecebb | 1427 | struct seccomp seccomp; |
1da177e4 LT |
1428 | |
1429 | /* Thread group tracking */ | |
1430 | u32 parent_exec_id; | |
1431 | u32 self_exec_id; | |
58568d2a MX |
1432 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1433 | * mempolicy */ | |
1da177e4 | 1434 | spinlock_t alloc_lock; |
1da177e4 | 1435 | |
b29739f9 | 1436 | /* Protection of the PI data structures: */ |
1d615482 | 1437 | raw_spinlock_t pi_lock; |
b29739f9 | 1438 | |
23f78d4a IM |
1439 | #ifdef CONFIG_RT_MUTEXES |
1440 | /* PI waiters blocked on a rt_mutex held by this task */ | |
1441 | struct plist_head pi_waiters; | |
1442 | /* Deadlock detection and priority inheritance handling */ | |
1443 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1444 | #endif |
1445 | ||
408894ee IM |
1446 | #ifdef CONFIG_DEBUG_MUTEXES |
1447 | /* mutex deadlock detection */ | |
1448 | struct mutex_waiter *blocked_on; | |
1449 | #endif | |
de30a2b3 IM |
1450 | #ifdef CONFIG_TRACE_IRQFLAGS |
1451 | unsigned int irq_events; | |
de30a2b3 | 1452 | unsigned long hardirq_enable_ip; |
de30a2b3 | 1453 | unsigned long hardirq_disable_ip; |
fa1452e8 | 1454 | unsigned int hardirq_enable_event; |
de30a2b3 | 1455 | unsigned int hardirq_disable_event; |
fa1452e8 HS |
1456 | int hardirqs_enabled; |
1457 | int hardirq_context; | |
de30a2b3 | 1458 | unsigned long softirq_disable_ip; |
de30a2b3 | 1459 | unsigned long softirq_enable_ip; |
fa1452e8 | 1460 | unsigned int softirq_disable_event; |
de30a2b3 | 1461 | unsigned int softirq_enable_event; |
fa1452e8 | 1462 | int softirqs_enabled; |
de30a2b3 IM |
1463 | int softirq_context; |
1464 | #endif | |
fbb9ce95 | 1465 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 1466 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
1467 | u64 curr_chain_key; |
1468 | int lockdep_depth; | |
fbb9ce95 | 1469 | unsigned int lockdep_recursion; |
c7aceaba | 1470 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 1471 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 1472 | #endif |
408894ee | 1473 | |
1da177e4 LT |
1474 | /* journalling filesystem info */ |
1475 | void *journal_info; | |
1476 | ||
d89d8796 | 1477 | /* stacked block device info */ |
bddd87c7 | 1478 | struct bio_list *bio_list; |
d89d8796 | 1479 | |
73c10101 JA |
1480 | #ifdef CONFIG_BLOCK |
1481 | /* stack plugging */ | |
1482 | struct blk_plug *plug; | |
1483 | #endif | |
1484 | ||
1da177e4 LT |
1485 | /* VM state */ |
1486 | struct reclaim_state *reclaim_state; | |
1487 | ||
1da177e4 LT |
1488 | struct backing_dev_info *backing_dev_info; |
1489 | ||
1490 | struct io_context *io_context; | |
1491 | ||
1492 | unsigned long ptrace_message; | |
1493 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 1494 | struct task_io_accounting ioac; |
8f0ab514 | 1495 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1496 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1497 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
49b5cf34 | 1498 | cputime_t acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
1499 | #endif |
1500 | #ifdef CONFIG_CPUSETS | |
58568d2a | 1501 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
cc9a6c87 | 1502 | seqcount_t mems_allowed_seq; /* Seqence no to catch updates */ |
825a46af | 1503 | int cpuset_mem_spread_rotor; |
6adef3eb | 1504 | int cpuset_slab_spread_rotor; |
1da177e4 | 1505 | #endif |
ddbcc7e8 | 1506 | #ifdef CONFIG_CGROUPS |
817929ec | 1507 | /* Control Group info protected by css_set_lock */ |
2c392b8c | 1508 | struct css_set __rcu *cgroups; |
817929ec PM |
1509 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
1510 | struct list_head cg_list; | |
ddbcc7e8 | 1511 | #endif |
42b2dd0a | 1512 | #ifdef CONFIG_FUTEX |
0771dfef | 1513 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1514 | #ifdef CONFIG_COMPAT |
1515 | struct compat_robust_list_head __user *compat_robust_list; | |
1516 | #endif | |
c87e2837 IM |
1517 | struct list_head pi_state_list; |
1518 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1519 | #endif |
cdd6c482 | 1520 | #ifdef CONFIG_PERF_EVENTS |
8dc85d54 | 1521 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
cdd6c482 IM |
1522 | struct mutex perf_event_mutex; |
1523 | struct list_head perf_event_list; | |
a63eaf34 | 1524 | #endif |
c7aceaba | 1525 | #ifdef CONFIG_NUMA |
58568d2a | 1526 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 1527 | short il_next; |
207205a2 | 1528 | short pref_node_fork; |
42b2dd0a | 1529 | #endif |
cbee9f88 PZ |
1530 | #ifdef CONFIG_NUMA_BALANCING |
1531 | int numa_scan_seq; | |
1532 | int numa_migrate_seq; | |
1533 | unsigned int numa_scan_period; | |
1534 | u64 node_stamp; /* migration stamp */ | |
1535 | struct callback_head numa_work; | |
1536 | #endif /* CONFIG_NUMA_BALANCING */ | |
1537 | ||
e56d0903 | 1538 | struct rcu_head rcu; |
b92ce558 JA |
1539 | |
1540 | /* | |
1541 | * cache last used pipe for splice | |
1542 | */ | |
1543 | struct pipe_inode_info *splice_pipe; | |
5640f768 ED |
1544 | |
1545 | struct page_frag task_frag; | |
1546 | ||
ca74e92b SN |
1547 | #ifdef CONFIG_TASK_DELAY_ACCT |
1548 | struct task_delay_info *delays; | |
f4f154fd AM |
1549 | #endif |
1550 | #ifdef CONFIG_FAULT_INJECTION | |
1551 | int make_it_fail; | |
ca74e92b | 1552 | #endif |
9d823e8f WF |
1553 | /* |
1554 | * when (nr_dirtied >= nr_dirtied_pause), it's time to call | |
1555 | * balance_dirty_pages() for some dirty throttling pause | |
1556 | */ | |
1557 | int nr_dirtied; | |
1558 | int nr_dirtied_pause; | |
83712358 | 1559 | unsigned long dirty_paused_when; /* start of a write-and-pause period */ |
9d823e8f | 1560 | |
9745512c AV |
1561 | #ifdef CONFIG_LATENCYTOP |
1562 | int latency_record_count; | |
1563 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1564 | #endif | |
6976675d AV |
1565 | /* |
1566 | * time slack values; these are used to round up poll() and | |
1567 | * select() etc timeout values. These are in nanoseconds. | |
1568 | */ | |
1569 | unsigned long timer_slack_ns; | |
1570 | unsigned long default_timer_slack_ns; | |
f8d570a4 | 1571 | |
fb52607a | 1572 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
3ad2f3fb | 1573 | /* Index of current stored address in ret_stack */ |
f201ae23 FW |
1574 | int curr_ret_stack; |
1575 | /* Stack of return addresses for return function tracing */ | |
1576 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
1577 | /* time stamp for last schedule */ |
1578 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
1579 | /* |
1580 | * Number of functions that haven't been traced | |
1581 | * because of depth overrun. | |
1582 | */ | |
1583 | atomic_t trace_overrun; | |
380c4b14 FW |
1584 | /* Pause for the tracing */ |
1585 | atomic_t tracing_graph_pause; | |
f201ae23 | 1586 | #endif |
ea4e2bc4 SR |
1587 | #ifdef CONFIG_TRACING |
1588 | /* state flags for use by tracers */ | |
1589 | unsigned long trace; | |
b1cff0ad | 1590 | /* bitmask and counter of trace recursion */ |
261842b7 SR |
1591 | unsigned long trace_recursion; |
1592 | #endif /* CONFIG_TRACING */ | |
c255a458 | 1593 | #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */ |
569b846d KH |
1594 | struct memcg_batch_info { |
1595 | int do_batch; /* incremented when batch uncharge started */ | |
1596 | struct mem_cgroup *memcg; /* target memcg of uncharge */ | |
7ffd4ca7 JW |
1597 | unsigned long nr_pages; /* uncharged usage */ |
1598 | unsigned long memsw_nr_pages; /* uncharged mem+swap usage */ | |
569b846d | 1599 | } memcg_batch; |
0e9d92f2 | 1600 | unsigned int memcg_kmem_skip_account; |
569b846d | 1601 | #endif |
bf26c018 FW |
1602 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
1603 | atomic_t ptrace_bp_refcnt; | |
1604 | #endif | |
0326f5a9 SD |
1605 | #ifdef CONFIG_UPROBES |
1606 | struct uprobe_task *utask; | |
0326f5a9 | 1607 | #endif |
1da177e4 LT |
1608 | }; |
1609 | ||
76e6eee0 | 1610 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
a4636818 | 1611 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
76e6eee0 | 1612 | |
cbee9f88 | 1613 | #ifdef CONFIG_NUMA_BALANCING |
b8593bfd | 1614 | extern void task_numa_fault(int node, int pages, bool migrated); |
1a687c2e | 1615 | extern void set_numabalancing_state(bool enabled); |
cbee9f88 | 1616 | #else |
b8593bfd | 1617 | static inline void task_numa_fault(int node, int pages, bool migrated) |
cbee9f88 PZ |
1618 | { |
1619 | } | |
1a687c2e MG |
1620 | static inline void set_numabalancing_state(bool enabled) |
1621 | { | |
1622 | } | |
cbee9f88 PZ |
1623 | #endif |
1624 | ||
e05606d3 IM |
1625 | /* |
1626 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT | |
1627 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH | |
1628 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority | |
1629 | * values are inverted: lower p->prio value means higher priority. | |
1630 | * | |
1631 | * The MAX_USER_RT_PRIO value allows the actual maximum | |
1632 | * RT priority to be separate from the value exported to | |
1633 | * user-space. This allows kernel threads to set their | |
1634 | * priority to a value higher than any user task. Note: | |
1635 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. | |
1636 | */ | |
1637 | ||
1638 | #define MAX_USER_RT_PRIO 100 | |
1639 | #define MAX_RT_PRIO MAX_USER_RT_PRIO | |
1640 | ||
1641 | #define MAX_PRIO (MAX_RT_PRIO + 40) | |
1642 | #define DEFAULT_PRIO (MAX_RT_PRIO + 20) | |
1643 | ||
1644 | static inline int rt_prio(int prio) | |
1645 | { | |
1646 | if (unlikely(prio < MAX_RT_PRIO)) | |
1647 | return 1; | |
1648 | return 0; | |
1649 | } | |
1650 | ||
e868171a | 1651 | static inline int rt_task(struct task_struct *p) |
e05606d3 IM |
1652 | { |
1653 | return rt_prio(p->prio); | |
1654 | } | |
1655 | ||
e868171a | 1656 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1657 | { |
1658 | return task->pids[PIDTYPE_PID].pid; | |
1659 | } | |
1660 | ||
e868171a | 1661 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1662 | { |
1663 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1664 | } | |
1665 | ||
6dda81f4 ON |
1666 | /* |
1667 | * Without tasklist or rcu lock it is not safe to dereference | |
1668 | * the result of task_pgrp/task_session even if task == current, | |
1669 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1670 | */ | |
e868171a | 1671 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1672 | { |
1673 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1674 | } | |
1675 | ||
e868171a | 1676 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1677 | { |
1678 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1679 | } | |
1680 | ||
7af57294 PE |
1681 | struct pid_namespace; |
1682 | ||
1683 | /* | |
1684 | * the helpers to get the task's different pids as they are seen | |
1685 | * from various namespaces | |
1686 | * | |
1687 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1688 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1689 | * current. | |
7af57294 PE |
1690 | * task_xid_nr_ns() : id seen from the ns specified; |
1691 | * | |
1692 | * set_task_vxid() : assigns a virtual id to a task; | |
1693 | * | |
7af57294 PE |
1694 | * see also pid_nr() etc in include/linux/pid.h |
1695 | */ | |
52ee2dfd ON |
1696 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1697 | struct pid_namespace *ns); | |
7af57294 | 1698 | |
e868171a | 1699 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1700 | { |
1701 | return tsk->pid; | |
1702 | } | |
1703 | ||
52ee2dfd ON |
1704 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1705 | struct pid_namespace *ns) | |
1706 | { | |
1707 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1708 | } | |
7af57294 PE |
1709 | |
1710 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1711 | { | |
52ee2dfd | 1712 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1713 | } |
1714 | ||
1715 | ||
e868171a | 1716 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1717 | { |
1718 | return tsk->tgid; | |
1719 | } | |
1720 | ||
2f2a3a46 | 1721 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1722 | |
1723 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1724 | { | |
1725 | return pid_vnr(task_tgid(tsk)); | |
1726 | } | |
1727 | ||
1728 | ||
52ee2dfd ON |
1729 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1730 | struct pid_namespace *ns) | |
7af57294 | 1731 | { |
52ee2dfd | 1732 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1733 | } |
1734 | ||
7af57294 PE |
1735 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1736 | { | |
52ee2dfd | 1737 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1738 | } |
1739 | ||
1740 | ||
52ee2dfd ON |
1741 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1742 | struct pid_namespace *ns) | |
7af57294 | 1743 | { |
52ee2dfd | 1744 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1745 | } |
1746 | ||
7af57294 PE |
1747 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1748 | { | |
52ee2dfd | 1749 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1750 | } |
1751 | ||
1b0f7ffd ON |
1752 | /* obsolete, do not use */ |
1753 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1754 | { | |
1755 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1756 | } | |
7af57294 | 1757 | |
1da177e4 LT |
1758 | /** |
1759 | * pid_alive - check that a task structure is not stale | |
1760 | * @p: Task structure to be checked. | |
1761 | * | |
1762 | * Test if a process is not yet dead (at most zombie state) | |
1763 | * If pid_alive fails, then pointers within the task structure | |
1764 | * can be stale and must not be dereferenced. | |
1765 | */ | |
e868171a | 1766 | static inline int pid_alive(struct task_struct *p) |
1da177e4 | 1767 | { |
92476d7f | 1768 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1769 | } |
1770 | ||
f400e198 | 1771 | /** |
b460cbc5 | 1772 | * is_global_init - check if a task structure is init |
3260259f HK |
1773 | * @tsk: Task structure to be checked. |
1774 | * | |
1775 | * Check if a task structure is the first user space task the kernel created. | |
b460cbc5 | 1776 | */ |
e868171a | 1777 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
1778 | { |
1779 | return tsk->pid == 1; | |
1780 | } | |
b460cbc5 | 1781 | |
9ec52099 CLG |
1782 | extern struct pid *cad_pid; |
1783 | ||
1da177e4 | 1784 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1785 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1786 | |
158d9ebd | 1787 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1788 | |
1789 | static inline void put_task_struct(struct task_struct *t) | |
1790 | { | |
1791 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1792 | __put_task_struct(t); |
e56d0903 | 1793 | } |
1da177e4 | 1794 | |
e80d0a1a FW |
1795 | extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); |
1796 | extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); | |
49048622 | 1797 | |
1da177e4 LT |
1798 | /* |
1799 | * Per process flags | |
1800 | */ | |
1da177e4 | 1801 | #define PF_EXITING 0x00000004 /* getting shut down */ |
778e9a9c | 1802 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1803 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
21aa9af0 | 1804 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1da177e4 | 1805 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
4db96cf0 | 1806 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1da177e4 LT |
1807 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
1808 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1809 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1810 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
72fa5997 | 1811 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */ |
1da177e4 | 1812 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
1da177e4 LT |
1813 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1814 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1815 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1816 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
1da177e4 | 1817 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 1818 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
1819 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
1820 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
1821 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ | |
1822 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ | |
9985b0ba | 1823 | #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ |
4db96cf0 | 1824 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
c61afb18 | 1825 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
61a87122 | 1826 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
58a69cb4 | 1827 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
1da177e4 LT |
1828 | |
1829 | /* | |
1830 | * Only the _current_ task can read/write to tsk->flags, but other | |
1831 | * tasks can access tsk->flags in readonly mode for example | |
1832 | * with tsk_used_math (like during threaded core dumping). | |
1833 | * There is however an exception to this rule during ptrace | |
1834 | * or during fork: the ptracer task is allowed to write to the | |
1835 | * child->flags of its traced child (same goes for fork, the parent | |
1836 | * can write to the child->flags), because we're guaranteed the | |
1837 | * child is not running and in turn not changing child->flags | |
1838 | * at the same time the parent does it. | |
1839 | */ | |
1840 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1841 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1842 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1843 | #define set_used_math() set_stopped_child_used_math(current) | |
1844 | #define conditional_stopped_child_used_math(condition, child) \ | |
1845 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1846 | #define conditional_used_math(condition) \ | |
1847 | conditional_stopped_child_used_math(condition, current) | |
1848 | #define copy_to_stopped_child_used_math(child) \ | |
1849 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1850 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1851 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1852 | #define used_math() tsk_used_math(current) | |
1853 | ||
e5c1902e | 1854 | /* |
a8f072c1 | 1855 | * task->jobctl flags |
e5c1902e | 1856 | */ |
a8f072c1 | 1857 | #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */ |
e5c1902e | 1858 | |
a8f072c1 TH |
1859 | #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */ |
1860 | #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */ | |
1861 | #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */ | |
73ddff2b | 1862 | #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */ |
fb1d910c | 1863 | #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */ |
a8f072c1 | 1864 | #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */ |
544b2c91 | 1865 | #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */ |
a8f072c1 TH |
1866 | |
1867 | #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT) | |
1868 | #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT) | |
1869 | #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT) | |
73ddff2b | 1870 | #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT) |
fb1d910c | 1871 | #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT) |
a8f072c1 | 1872 | #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT) |
544b2c91 | 1873 | #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT) |
a8f072c1 | 1874 | |
fb1d910c | 1875 | #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY) |
73ddff2b | 1876 | #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK) |
3759a0d9 | 1877 | |
7dd3db54 TH |
1878 | extern bool task_set_jobctl_pending(struct task_struct *task, |
1879 | unsigned int mask); | |
73ddff2b | 1880 | extern void task_clear_jobctl_trapping(struct task_struct *task); |
3759a0d9 TH |
1881 | extern void task_clear_jobctl_pending(struct task_struct *task, |
1882 | unsigned int mask); | |
39efa3ef | 1883 | |
a57eb940 | 1884 | #ifdef CONFIG_PREEMPT_RCU |
f41d911f PM |
1885 | |
1886 | #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ | |
1aa03f11 | 1887 | #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ |
f41d911f PM |
1888 | |
1889 | static inline void rcu_copy_process(struct task_struct *p) | |
1890 | { | |
1891 | p->rcu_read_lock_nesting = 0; | |
1892 | p->rcu_read_unlock_special = 0; | |
a57eb940 | 1893 | #ifdef CONFIG_TREE_PREEMPT_RCU |
dd5d19ba | 1894 | p->rcu_blocked_node = NULL; |
24278d14 PM |
1895 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
1896 | #ifdef CONFIG_RCU_BOOST | |
1897 | p->rcu_boost_mutex = NULL; | |
1898 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
f41d911f PM |
1899 | INIT_LIST_HEAD(&p->rcu_node_entry); |
1900 | } | |
1901 | ||
f41d911f PM |
1902 | #else |
1903 | ||
1904 | static inline void rcu_copy_process(struct task_struct *p) | |
1905 | { | |
1906 | } | |
1907 | ||
1908 | #endif | |
1909 | ||
907aed48 MG |
1910 | static inline void tsk_restore_flags(struct task_struct *task, |
1911 | unsigned long orig_flags, unsigned long flags) | |
1912 | { | |
1913 | task->flags &= ~flags; | |
1914 | task->flags |= orig_flags & flags; | |
1915 | } | |
1916 | ||
1da177e4 | 1917 | #ifdef CONFIG_SMP |
1e1b6c51 KM |
1918 | extern void do_set_cpus_allowed(struct task_struct *p, |
1919 | const struct cpumask *new_mask); | |
1920 | ||
cd8ba7cd | 1921 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1922 | const struct cpumask *new_mask); |
1da177e4 | 1923 | #else |
1e1b6c51 KM |
1924 | static inline void do_set_cpus_allowed(struct task_struct *p, |
1925 | const struct cpumask *new_mask) | |
1926 | { | |
1927 | } | |
cd8ba7cd | 1928 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1929 | const struct cpumask *new_mask) |
1da177e4 | 1930 | { |
96f874e2 | 1931 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1932 | return -EINVAL; |
1933 | return 0; | |
1934 | } | |
1935 | #endif | |
e0ad9556 | 1936 | |
5167e8d5 PZ |
1937 | #ifdef CONFIG_NO_HZ |
1938 | void calc_load_enter_idle(void); | |
1939 | void calc_load_exit_idle(void); | |
1940 | #else | |
1941 | static inline void calc_load_enter_idle(void) { } | |
1942 | static inline void calc_load_exit_idle(void) { } | |
1943 | #endif /* CONFIG_NO_HZ */ | |
1944 | ||
e0ad9556 | 1945 | #ifndef CONFIG_CPUMASK_OFFSTACK |
cd8ba7cd MT |
1946 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
1947 | { | |
1948 | return set_cpus_allowed_ptr(p, &new_mask); | |
1949 | } | |
e0ad9556 | 1950 | #endif |
1da177e4 | 1951 | |
b342501c | 1952 | /* |
c676329a PZ |
1953 | * Do not use outside of architecture code which knows its limitations. |
1954 | * | |
1955 | * sched_clock() has no promise of monotonicity or bounded drift between | |
1956 | * CPUs, use (which you should not) requires disabling IRQs. | |
1957 | * | |
1958 | * Please use one of the three interfaces below. | |
b342501c | 1959 | */ |
1bbfa6f2 | 1960 | extern unsigned long long notrace sched_clock(void); |
c676329a | 1961 | /* |
489a71b0 | 1962 | * See the comment in kernel/sched/clock.c |
c676329a PZ |
1963 | */ |
1964 | extern u64 cpu_clock(int cpu); | |
1965 | extern u64 local_clock(void); | |
1966 | extern u64 sched_clock_cpu(int cpu); | |
1967 | ||
e436d800 | 1968 | |
c1955a3d | 1969 | extern void sched_clock_init(void); |
3e51f33f | 1970 | |
c1955a3d | 1971 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
3e51f33f PZ |
1972 | static inline void sched_clock_tick(void) |
1973 | { | |
1974 | } | |
1975 | ||
1976 | static inline void sched_clock_idle_sleep_event(void) | |
1977 | { | |
1978 | } | |
1979 | ||
1980 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) | |
1981 | { | |
1982 | } | |
1983 | #else | |
c676329a PZ |
1984 | /* |
1985 | * Architectures can set this to 1 if they have specified | |
1986 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, | |
1987 | * but then during bootup it turns out that sched_clock() | |
1988 | * is reliable after all: | |
1989 | */ | |
1990 | extern int sched_clock_stable; | |
1991 | ||
3e51f33f PZ |
1992 | extern void sched_clock_tick(void); |
1993 | extern void sched_clock_idle_sleep_event(void); | |
1994 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
1995 | #endif | |
1996 | ||
b52bfee4 VP |
1997 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
1998 | /* | |
1999 | * An i/f to runtime opt-in for irq time accounting based off of sched_clock. | |
2000 | * The reason for this explicit opt-in is not to have perf penalty with | |
2001 | * slow sched_clocks. | |
2002 | */ | |
2003 | extern void enable_sched_clock_irqtime(void); | |
2004 | extern void disable_sched_clock_irqtime(void); | |
2005 | #else | |
2006 | static inline void enable_sched_clock_irqtime(void) {} | |
2007 | static inline void disable_sched_clock_irqtime(void) {} | |
2008 | #endif | |
2009 | ||
36c8b586 | 2010 | extern unsigned long long |
41b86e9c | 2011 | task_sched_runtime(struct task_struct *task); |
1da177e4 LT |
2012 | |
2013 | /* sched_exec is called by processes performing an exec */ | |
2014 | #ifdef CONFIG_SMP | |
2015 | extern void sched_exec(void); | |
2016 | #else | |
2017 | #define sched_exec() {} | |
2018 | #endif | |
2019 | ||
2aa44d05 IM |
2020 | extern void sched_clock_idle_sleep_event(void); |
2021 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 2022 | |
1da177e4 LT |
2023 | #ifdef CONFIG_HOTPLUG_CPU |
2024 | extern void idle_task_exit(void); | |
2025 | #else | |
2026 | static inline void idle_task_exit(void) {} | |
2027 | #endif | |
2028 | ||
06d8308c TG |
2029 | #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) |
2030 | extern void wake_up_idle_cpu(int cpu); | |
2031 | #else | |
2032 | static inline void wake_up_idle_cpu(int cpu) { } | |
2033 | #endif | |
2034 | ||
21805085 | 2035 | extern unsigned int sysctl_sched_latency; |
b2be5e96 | 2036 | extern unsigned int sysctl_sched_min_granularity; |
bf0f6f24 | 2037 | extern unsigned int sysctl_sched_wakeup_granularity; |
bf0f6f24 | 2038 | extern unsigned int sysctl_sched_child_runs_first; |
1983a922 CE |
2039 | |
2040 | enum sched_tunable_scaling { | |
2041 | SCHED_TUNABLESCALING_NONE, | |
2042 | SCHED_TUNABLESCALING_LOG, | |
2043 | SCHED_TUNABLESCALING_LINEAR, | |
2044 | SCHED_TUNABLESCALING_END, | |
2045 | }; | |
2046 | extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; | |
2047 | ||
4b96a29b | 2048 | extern unsigned int sysctl_numa_balancing_scan_delay; |
cbee9f88 PZ |
2049 | extern unsigned int sysctl_numa_balancing_scan_period_min; |
2050 | extern unsigned int sysctl_numa_balancing_scan_period_max; | |
b8593bfd | 2051 | extern unsigned int sysctl_numa_balancing_scan_period_reset; |
6e5fb223 | 2052 | extern unsigned int sysctl_numa_balancing_scan_size; |
cbee9f88 PZ |
2053 | extern unsigned int sysctl_numa_balancing_settle_count; |
2054 | ||
2bba22c5 | 2055 | #ifdef CONFIG_SCHED_DEBUG |
da84d961 | 2056 | extern unsigned int sysctl_sched_migration_cost; |
b82d9fdd | 2057 | extern unsigned int sysctl_sched_nr_migrate; |
e9e9250b | 2058 | extern unsigned int sysctl_sched_time_avg; |
cd1bb94b | 2059 | extern unsigned int sysctl_timer_migration; |
a7a4f8a7 | 2060 | extern unsigned int sysctl_sched_shares_window; |
b2be5e96 | 2061 | |
1983a922 | 2062 | int sched_proc_update_handler(struct ctl_table *table, int write, |
8d65af78 | 2063 | void __user *buffer, size_t *length, |
b2be5e96 | 2064 | loff_t *ppos); |
2bd8e6d4 | 2065 | #endif |
eea08f32 AB |
2066 | #ifdef CONFIG_SCHED_DEBUG |
2067 | static inline unsigned int get_sysctl_timer_migration(void) | |
2068 | { | |
2069 | return sysctl_timer_migration; | |
2070 | } | |
2071 | #else | |
2072 | static inline unsigned int get_sysctl_timer_migration(void) | |
2073 | { | |
2074 | return 1; | |
2075 | } | |
2076 | #endif | |
9f0c1e56 PZ |
2077 | extern unsigned int sysctl_sched_rt_period; |
2078 | extern int sysctl_sched_rt_runtime; | |
2bd8e6d4 | 2079 | |
d0b27fa7 | 2080 | int sched_rt_handler(struct ctl_table *table, int write, |
8d65af78 | 2081 | void __user *buffer, size_t *lenp, |
d0b27fa7 PZ |
2082 | loff_t *ppos); |
2083 | ||
5091faa4 MG |
2084 | #ifdef CONFIG_SCHED_AUTOGROUP |
2085 | extern unsigned int sysctl_sched_autogroup_enabled; | |
2086 | ||
2087 | extern void sched_autogroup_create_attach(struct task_struct *p); | |
2088 | extern void sched_autogroup_detach(struct task_struct *p); | |
2089 | extern void sched_autogroup_fork(struct signal_struct *sig); | |
2090 | extern void sched_autogroup_exit(struct signal_struct *sig); | |
2091 | #ifdef CONFIG_PROC_FS | |
2092 | extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); | |
2e5b5b3a | 2093 | extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice); |
5091faa4 MG |
2094 | #endif |
2095 | #else | |
2096 | static inline void sched_autogroup_create_attach(struct task_struct *p) { } | |
2097 | static inline void sched_autogroup_detach(struct task_struct *p) { } | |
2098 | static inline void sched_autogroup_fork(struct signal_struct *sig) { } | |
2099 | static inline void sched_autogroup_exit(struct signal_struct *sig) { } | |
2100 | #endif | |
2101 | ||
ec12cb7f PT |
2102 | #ifdef CONFIG_CFS_BANDWIDTH |
2103 | extern unsigned int sysctl_sched_cfs_bandwidth_slice; | |
2104 | #endif | |
2105 | ||
b29739f9 | 2106 | #ifdef CONFIG_RT_MUTEXES |
36c8b586 IM |
2107 | extern int rt_mutex_getprio(struct task_struct *p); |
2108 | extern void rt_mutex_setprio(struct task_struct *p, int prio); | |
2109 | extern void rt_mutex_adjust_pi(struct task_struct *p); | |
3c7d5184 TG |
2110 | static inline bool tsk_is_pi_blocked(struct task_struct *tsk) |
2111 | { | |
2112 | return tsk->pi_blocked_on != NULL; | |
2113 | } | |
b29739f9 | 2114 | #else |
e868171a | 2115 | static inline int rt_mutex_getprio(struct task_struct *p) |
b29739f9 IM |
2116 | { |
2117 | return p->normal_prio; | |
2118 | } | |
95e02ca9 | 2119 | # define rt_mutex_adjust_pi(p) do { } while (0) |
3c7d5184 TG |
2120 | static inline bool tsk_is_pi_blocked(struct task_struct *tsk) |
2121 | { | |
2122 | return false; | |
2123 | } | |
b29739f9 IM |
2124 | #endif |
2125 | ||
d95f4122 | 2126 | extern bool yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
2127 | extern void set_user_nice(struct task_struct *p, long nice); |
2128 | extern int task_prio(const struct task_struct *p); | |
2129 | extern int task_nice(const struct task_struct *p); | |
2130 | extern int can_nice(const struct task_struct *p, const int nice); | |
2131 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 2132 | extern int idle_cpu(int cpu); |
fe7de49f KM |
2133 | extern int sched_setscheduler(struct task_struct *, int, |
2134 | const struct sched_param *); | |
961ccddd | 2135 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
fe7de49f | 2136 | const struct sched_param *); |
36c8b586 | 2137 | extern struct task_struct *idle_task(int cpu); |
c4f30608 PM |
2138 | /** |
2139 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 2140 | * @p: the task in question. |
c4f30608 | 2141 | */ |
7061ca3b | 2142 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 PM |
2143 | { |
2144 | return p->pid == 0; | |
2145 | } | |
36c8b586 IM |
2146 | extern struct task_struct *curr_task(int cpu); |
2147 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
2148 | |
2149 | void yield(void); | |
2150 | ||
2151 | /* | |
2152 | * The default (Linux) execution domain. | |
2153 | */ | |
2154 | extern struct exec_domain default_exec_domain; | |
2155 | ||
2156 | union thread_union { | |
2157 | struct thread_info thread_info; | |
2158 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
2159 | }; | |
2160 | ||
2161 | #ifndef __HAVE_ARCH_KSTACK_END | |
2162 | static inline int kstack_end(void *addr) | |
2163 | { | |
2164 | /* Reliable end of stack detection: | |
2165 | * Some APM bios versions misalign the stack | |
2166 | */ | |
2167 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
2168 | } | |
2169 | #endif | |
2170 | ||
2171 | extern union thread_union init_thread_union; | |
2172 | extern struct task_struct init_task; | |
2173 | ||
2174 | extern struct mm_struct init_mm; | |
2175 | ||
198fe21b PE |
2176 | extern struct pid_namespace init_pid_ns; |
2177 | ||
2178 | /* | |
2179 | * find a task by one of its numerical ids | |
2180 | * | |
198fe21b PE |
2181 | * find_task_by_pid_ns(): |
2182 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
2183 | * find_task_by_vpid(): |
2184 | * finds a task by its virtual pid | |
198fe21b | 2185 | * |
e49859e7 | 2186 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
2187 | */ |
2188 | ||
228ebcbe PE |
2189 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
2190 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
2191 | struct pid_namespace *ns); | |
198fe21b | 2192 | |
8520d7c7 | 2193 | extern void __set_special_pids(struct pid *pid); |
1da177e4 LT |
2194 | |
2195 | /* per-UID process charging. */ | |
7b44ab97 | 2196 | extern struct user_struct * alloc_uid(kuid_t); |
1da177e4 LT |
2197 | static inline struct user_struct *get_uid(struct user_struct *u) |
2198 | { | |
2199 | atomic_inc(&u->__count); | |
2200 | return u; | |
2201 | } | |
2202 | extern void free_uid(struct user_struct *); | |
1da177e4 LT |
2203 | |
2204 | #include <asm/current.h> | |
2205 | ||
f0af911a | 2206 | extern void xtime_update(unsigned long ticks); |
1da177e4 | 2207 | |
b3c97528 HH |
2208 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
2209 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 2210 | extern void wake_up_new_task(struct task_struct *tsk); |
1da177e4 LT |
2211 | #ifdef CONFIG_SMP |
2212 | extern void kick_process(struct task_struct *tsk); | |
2213 | #else | |
2214 | static inline void kick_process(struct task_struct *tsk) { } | |
2215 | #endif | |
3e51e3ed | 2216 | extern void sched_fork(struct task_struct *p); |
ad46c2c4 | 2217 | extern void sched_dead(struct task_struct *p); |
1da177e4 | 2218 | |
1da177e4 LT |
2219 | extern void proc_caches_init(void); |
2220 | extern void flush_signals(struct task_struct *); | |
3bcac026 | 2221 | extern void __flush_signals(struct task_struct *); |
10ab825b | 2222 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
2223 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
2224 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
2225 | ||
2226 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
2227 | { | |
2228 | unsigned long flags; | |
2229 | int ret; | |
2230 | ||
2231 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
2232 | ret = dequeue_signal(tsk, mask, info); | |
2233 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
2234 | ||
2235 | return ret; | |
53c8f9f1 | 2236 | } |
1da177e4 LT |
2237 | |
2238 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
2239 | sigset_t *mask); | |
2240 | extern void unblock_all_signals(void); | |
2241 | extern void release_task(struct task_struct * p); | |
2242 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1da177e4 LT |
2243 | extern int force_sigsegv(int, struct task_struct *); |
2244 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 | 2245 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
c4b92fc1 | 2246 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
d178bc3a SH |
2247 | extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *, |
2248 | const struct cred *, u32); | |
c4b92fc1 EB |
2249 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
2250 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 2251 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
86773473 | 2252 | extern __must_check bool do_notify_parent(struct task_struct *, int); |
a7f0765e | 2253 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); |
1da177e4 | 2254 | extern void force_sig(int, struct task_struct *); |
1da177e4 | 2255 | extern int send_sig(int, struct task_struct *, int); |
09faef11 | 2256 | extern int zap_other_threads(struct task_struct *p); |
1da177e4 LT |
2257 | extern struct sigqueue *sigqueue_alloc(void); |
2258 | extern void sigqueue_free(struct sigqueue *); | |
ac5c2153 | 2259 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
9ac95f2f | 2260 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 LT |
2261 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
2262 | ||
51a7b448 AV |
2263 | static inline void restore_saved_sigmask(void) |
2264 | { | |
2265 | if (test_and_clear_restore_sigmask()) | |
77097ae5 | 2266 | __set_current_blocked(¤t->saved_sigmask); |
51a7b448 AV |
2267 | } |
2268 | ||
b7f9a11a AV |
2269 | static inline sigset_t *sigmask_to_save(void) |
2270 | { | |
2271 | sigset_t *res = ¤t->blocked; | |
2272 | if (unlikely(test_restore_sigmask())) | |
2273 | res = ¤t->saved_sigmask; | |
2274 | return res; | |
2275 | } | |
2276 | ||
9ec52099 CLG |
2277 | static inline int kill_cad_pid(int sig, int priv) |
2278 | { | |
2279 | return kill_pid(cad_pid, sig, priv); | |
2280 | } | |
2281 | ||
1da177e4 LT |
2282 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
2283 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
2284 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
2285 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
2286 | ||
2a855dd0 SAS |
2287 | /* |
2288 | * True if we are on the alternate signal stack. | |
2289 | */ | |
1da177e4 LT |
2290 | static inline int on_sig_stack(unsigned long sp) |
2291 | { | |
2a855dd0 SAS |
2292 | #ifdef CONFIG_STACK_GROWSUP |
2293 | return sp >= current->sas_ss_sp && | |
2294 | sp - current->sas_ss_sp < current->sas_ss_size; | |
2295 | #else | |
2296 | return sp > current->sas_ss_sp && | |
2297 | sp - current->sas_ss_sp <= current->sas_ss_size; | |
2298 | #endif | |
1da177e4 LT |
2299 | } |
2300 | ||
2301 | static inline int sas_ss_flags(unsigned long sp) | |
2302 | { | |
2303 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
2304 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
2305 | } | |
2306 | ||
1da177e4 LT |
2307 | /* |
2308 | * Routines for handling mm_structs | |
2309 | */ | |
2310 | extern struct mm_struct * mm_alloc(void); | |
2311 | ||
2312 | /* mmdrop drops the mm and the page tables */ | |
b3c97528 | 2313 | extern void __mmdrop(struct mm_struct *); |
1da177e4 LT |
2314 | static inline void mmdrop(struct mm_struct * mm) |
2315 | { | |
6fb43d7b | 2316 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
2317 | __mmdrop(mm); |
2318 | } | |
2319 | ||
2320 | /* mmput gets rid of the mappings and all user-space */ | |
2321 | extern void mmput(struct mm_struct *); | |
2322 | /* Grab a reference to a task's mm, if it is not already going away */ | |
2323 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
8cdb878d CY |
2324 | /* |
2325 | * Grab a reference to a task's mm, if it is not already going away | |
2326 | * and ptrace_may_access with the mode parameter passed to it | |
2327 | * succeeds. | |
2328 | */ | |
2329 | extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode); | |
1da177e4 LT |
2330 | /* Remove the current tasks stale references to the old mm_struct */ |
2331 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
402b0862 CO |
2332 | /* Allocate a new mm structure and copy contents from tsk->mm */ |
2333 | extern struct mm_struct *dup_mm(struct task_struct *tsk); | |
1da177e4 | 2334 | |
6f2c55b8 | 2335 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
afa86fc4 | 2336 | struct task_struct *); |
1da177e4 LT |
2337 | extern void flush_thread(void); |
2338 | extern void exit_thread(void); | |
2339 | ||
1da177e4 | 2340 | extern void exit_files(struct task_struct *); |
a7e5328a | 2341 | extern void __cleanup_sighand(struct sighand_struct *); |
cbaffba1 | 2342 | |
1da177e4 | 2343 | extern void exit_itimers(struct signal_struct *); |
cbaffba1 | 2344 | extern void flush_itimer_signals(void); |
1da177e4 | 2345 | |
9402c95f | 2346 | extern void do_group_exit(int); |
1da177e4 | 2347 | |
1da177e4 LT |
2348 | extern int allow_signal(int); |
2349 | extern int disallow_signal(int); | |
1da177e4 | 2350 | |
d7627467 DH |
2351 | extern int do_execve(const char *, |
2352 | const char __user * const __user *, | |
da3d4c5f | 2353 | const char __user * const __user *); |
e80d6661 | 2354 | extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *); |
36c8b586 | 2355 | struct task_struct *fork_idle(int); |
2aa3a7f8 | 2356 | extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
1da177e4 LT |
2357 | |
2358 | extern void set_task_comm(struct task_struct *tsk, char *from); | |
59714d65 | 2359 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
2360 | |
2361 | #ifdef CONFIG_SMP | |
317f3941 | 2362 | void scheduler_ipi(void); |
85ba2d86 | 2363 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 2364 | #else |
184748cc | 2365 | static inline void scheduler_ipi(void) { } |
85ba2d86 RM |
2366 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
2367 | long match_state) | |
2368 | { | |
2369 | return 1; | |
2370 | } | |
1da177e4 LT |
2371 | #endif |
2372 | ||
05725f7e JP |
2373 | #define next_task(p) \ |
2374 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
1da177e4 LT |
2375 | |
2376 | #define for_each_process(p) \ | |
2377 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
2378 | ||
5bb459bb | 2379 | extern bool current_is_single_threaded(void); |
d84f4f99 | 2380 | |
1da177e4 LT |
2381 | /* |
2382 | * Careful: do_each_thread/while_each_thread is a double loop so | |
2383 | * 'break' will not work as expected - use goto instead. | |
2384 | */ | |
2385 | #define do_each_thread(g, t) \ | |
2386 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
2387 | ||
2388 | #define while_each_thread(g, t) \ | |
2389 | while ((t = next_thread(t)) != g) | |
2390 | ||
7e49827c ON |
2391 | static inline int get_nr_threads(struct task_struct *tsk) |
2392 | { | |
b3ac022c | 2393 | return tsk->signal->nr_threads; |
7e49827c ON |
2394 | } |
2395 | ||
087806b1 ON |
2396 | static inline bool thread_group_leader(struct task_struct *p) |
2397 | { | |
2398 | return p->exit_signal >= 0; | |
2399 | } | |
1da177e4 | 2400 | |
0804ef4b EB |
2401 | /* Do to the insanities of de_thread it is possible for a process |
2402 | * to have the pid of the thread group leader without actually being | |
2403 | * the thread group leader. For iteration through the pids in proc | |
2404 | * all we care about is that we have a task with the appropriate | |
2405 | * pid, we don't actually care if we have the right task. | |
2406 | */ | |
e868171a | 2407 | static inline int has_group_leader_pid(struct task_struct *p) |
0804ef4b EB |
2408 | { |
2409 | return p->pid == p->tgid; | |
2410 | } | |
2411 | ||
bac0abd6 PE |
2412 | static inline |
2413 | int same_thread_group(struct task_struct *p1, struct task_struct *p2) | |
2414 | { | |
2415 | return p1->tgid == p2->tgid; | |
2416 | } | |
2417 | ||
36c8b586 | 2418 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 | 2419 | { |
05725f7e JP |
2420 | return list_entry_rcu(p->thread_group.next, |
2421 | struct task_struct, thread_group); | |
47e65328 ON |
2422 | } |
2423 | ||
e868171a | 2424 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 2425 | { |
47e65328 | 2426 | return list_empty(&p->thread_group); |
1da177e4 LT |
2427 | } |
2428 | ||
2429 | #define delay_group_leader(p) \ | |
2430 | (thread_group_leader(p) && !thread_group_empty(p)) | |
2431 | ||
1da177e4 | 2432 | /* |
260ea101 | 2433 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 2434 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 | 2435 | * pins the final release of task.io_context. Also protects ->cpuset and |
d68b46fe | 2436 | * ->cgroup.subsys[]. And ->vfork_done. |
1da177e4 LT |
2437 | * |
2438 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
2439 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
2440 | * neither inside nor outside. | |
2441 | */ | |
2442 | static inline void task_lock(struct task_struct *p) | |
2443 | { | |
2444 | spin_lock(&p->alloc_lock); | |
2445 | } | |
2446 | ||
2447 | static inline void task_unlock(struct task_struct *p) | |
2448 | { | |
2449 | spin_unlock(&p->alloc_lock); | |
2450 | } | |
2451 | ||
b8ed374e | 2452 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, |
f63ee72e ON |
2453 | unsigned long *flags); |
2454 | ||
9388dc30 AV |
2455 | static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
2456 | unsigned long *flags) | |
2457 | { | |
2458 | struct sighand_struct *ret; | |
2459 | ||
2460 | ret = __lock_task_sighand(tsk, flags); | |
2461 | (void)__cond_lock(&tsk->sighand->siglock, ret); | |
2462 | return ret; | |
2463 | } | |
b8ed374e | 2464 | |
f63ee72e ON |
2465 | static inline void unlock_task_sighand(struct task_struct *tsk, |
2466 | unsigned long *flags) | |
2467 | { | |
2468 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
2469 | } | |
2470 | ||
4714d1d3 | 2471 | #ifdef CONFIG_CGROUPS |
257058ae | 2472 | static inline void threadgroup_change_begin(struct task_struct *tsk) |
4714d1d3 | 2473 | { |
257058ae | 2474 | down_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2475 | } |
257058ae | 2476 | static inline void threadgroup_change_end(struct task_struct *tsk) |
4714d1d3 | 2477 | { |
257058ae | 2478 | up_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2479 | } |
77e4ef99 TH |
2480 | |
2481 | /** | |
2482 | * threadgroup_lock - lock threadgroup | |
2483 | * @tsk: member task of the threadgroup to lock | |
2484 | * | |
2485 | * Lock the threadgroup @tsk belongs to. No new task is allowed to enter | |
2486 | * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or | |
2487 | * perform exec. This is useful for cases where the threadgroup needs to | |
2488 | * stay stable across blockable operations. | |
2489 | * | |
2490 | * fork and exit paths explicitly call threadgroup_change_{begin|end}() for | |
2491 | * synchronization. While held, no new task will be added to threadgroup | |
2492 | * and no existing live task will have its PF_EXITING set. | |
2493 | * | |
2494 | * During exec, a task goes and puts its thread group through unusual | |
2495 | * changes. After de-threading, exclusive access is assumed to resources | |
2496 | * which are usually shared by tasks in the same group - e.g. sighand may | |
2497 | * be replaced with a new one. Also, the exec'ing task takes over group | |
2498 | * leader role including its pid. Exclude these changes while locked by | |
2499 | * grabbing cred_guard_mutex which is used to synchronize exec path. | |
2500 | */ | |
257058ae | 2501 | static inline void threadgroup_lock(struct task_struct *tsk) |
4714d1d3 | 2502 | { |
77e4ef99 TH |
2503 | /* |
2504 | * exec uses exit for de-threading nesting group_rwsem inside | |
2505 | * cred_guard_mutex. Grab cred_guard_mutex first. | |
2506 | */ | |
2507 | mutex_lock(&tsk->signal->cred_guard_mutex); | |
257058ae | 2508 | down_write(&tsk->signal->group_rwsem); |
4714d1d3 | 2509 | } |
77e4ef99 TH |
2510 | |
2511 | /** | |
2512 | * threadgroup_unlock - unlock threadgroup | |
2513 | * @tsk: member task of the threadgroup to unlock | |
2514 | * | |
2515 | * Reverse threadgroup_lock(). | |
2516 | */ | |
257058ae | 2517 | static inline void threadgroup_unlock(struct task_struct *tsk) |
4714d1d3 | 2518 | { |
257058ae | 2519 | up_write(&tsk->signal->group_rwsem); |
77e4ef99 | 2520 | mutex_unlock(&tsk->signal->cred_guard_mutex); |
4714d1d3 BB |
2521 | } |
2522 | #else | |
257058ae TH |
2523 | static inline void threadgroup_change_begin(struct task_struct *tsk) {} |
2524 | static inline void threadgroup_change_end(struct task_struct *tsk) {} | |
2525 | static inline void threadgroup_lock(struct task_struct *tsk) {} | |
2526 | static inline void threadgroup_unlock(struct task_struct *tsk) {} | |
4714d1d3 BB |
2527 | #endif |
2528 | ||
f037360f AV |
2529 | #ifndef __HAVE_THREAD_FUNCTIONS |
2530 | ||
f7e4217b RZ |
2531 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
2532 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 2533 | |
10ebffde AV |
2534 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2535 | { | |
2536 | *task_thread_info(p) = *task_thread_info(org); | |
2537 | task_thread_info(p)->task = p; | |
2538 | } | |
2539 | ||
2540 | static inline unsigned long *end_of_stack(struct task_struct *p) | |
2541 | { | |
f7e4217b | 2542 | return (unsigned long *)(task_thread_info(p) + 1); |
10ebffde AV |
2543 | } |
2544 | ||
f037360f AV |
2545 | #endif |
2546 | ||
8b05c7e6 FT |
2547 | static inline int object_is_on_stack(void *obj) |
2548 | { | |
2549 | void *stack = task_stack_page(current); | |
2550 | ||
2551 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); | |
2552 | } | |
2553 | ||
8c9843e5 BH |
2554 | extern void thread_info_cache_init(void); |
2555 | ||
7c9f8861 ES |
2556 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2557 | static inline unsigned long stack_not_used(struct task_struct *p) | |
2558 | { | |
2559 | unsigned long *n = end_of_stack(p); | |
2560 | ||
2561 | do { /* Skip over canary */ | |
2562 | n++; | |
2563 | } while (!*n); | |
2564 | ||
2565 | return (unsigned long)n - (unsigned long)end_of_stack(p); | |
2566 | } | |
2567 | #endif | |
2568 | ||
1da177e4 LT |
2569 | /* set thread flags in other task's structures |
2570 | * - see asm/thread_info.h for TIF_xxxx flags available | |
2571 | */ | |
2572 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2573 | { | |
a1261f54 | 2574 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2575 | } |
2576 | ||
2577 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2578 | { | |
a1261f54 | 2579 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2580 | } |
2581 | ||
2582 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2583 | { | |
a1261f54 | 2584 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2585 | } |
2586 | ||
2587 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2588 | { | |
a1261f54 | 2589 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2590 | } |
2591 | ||
2592 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2593 | { | |
a1261f54 | 2594 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2595 | } |
2596 | ||
2597 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2598 | { | |
2599 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2600 | } | |
2601 | ||
2602 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2603 | { | |
2604 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2605 | } | |
2606 | ||
8ae121ac GH |
2607 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2608 | { | |
2609 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2610 | } | |
2611 | ||
690cc3ff EB |
2612 | static inline int restart_syscall(void) |
2613 | { | |
2614 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
2615 | return -ERESTARTNOINTR; | |
2616 | } | |
2617 | ||
1da177e4 LT |
2618 | static inline int signal_pending(struct task_struct *p) |
2619 | { | |
2620 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
2621 | } | |
f776d12d | 2622 | |
d9588725 RM |
2623 | static inline int __fatal_signal_pending(struct task_struct *p) |
2624 | { | |
2625 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
2626 | } | |
f776d12d MW |
2627 | |
2628 | static inline int fatal_signal_pending(struct task_struct *p) | |
2629 | { | |
2630 | return signal_pending(p) && __fatal_signal_pending(p); | |
2631 | } | |
2632 | ||
16882c1e ON |
2633 | static inline int signal_pending_state(long state, struct task_struct *p) |
2634 | { | |
2635 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
2636 | return 0; | |
2637 | if (!signal_pending(p)) | |
2638 | return 0; | |
2639 | ||
16882c1e ON |
2640 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2641 | } | |
2642 | ||
1da177e4 LT |
2643 | static inline int need_resched(void) |
2644 | { | |
9404ef02 | 2645 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
1da177e4 LT |
2646 | } |
2647 | ||
2648 | /* | |
2649 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2650 | * explicit rescheduling in places that are safe. The return | |
2651 | * value indicates whether a reschedule was done in fact. | |
2652 | * cond_resched_lock() will drop the spinlock before scheduling, | |
2653 | * cond_resched_softirq() will enable bhs before scheduling. | |
2654 | */ | |
c3921ab7 | 2655 | extern int _cond_resched(void); |
6f80bd98 | 2656 | |
613afbf8 FW |
2657 | #define cond_resched() ({ \ |
2658 | __might_sleep(__FILE__, __LINE__, 0); \ | |
2659 | _cond_resched(); \ | |
2660 | }) | |
6f80bd98 | 2661 | |
613afbf8 FW |
2662 | extern int __cond_resched_lock(spinlock_t *lock); |
2663 | ||
bdd4e85d | 2664 | #ifdef CONFIG_PREEMPT_COUNT |
716a4234 | 2665 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET |
02b67cc3 | 2666 | #else |
716a4234 | 2667 | #define PREEMPT_LOCK_OFFSET 0 |
02b67cc3 | 2668 | #endif |
716a4234 | 2669 | |
613afbf8 | 2670 | #define cond_resched_lock(lock) ({ \ |
716a4234 | 2671 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ |
613afbf8 FW |
2672 | __cond_resched_lock(lock); \ |
2673 | }) | |
2674 | ||
2675 | extern int __cond_resched_softirq(void); | |
2676 | ||
75e1056f VP |
2677 | #define cond_resched_softirq() ({ \ |
2678 | __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ | |
2679 | __cond_resched_softirq(); \ | |
613afbf8 | 2680 | }) |
1da177e4 LT |
2681 | |
2682 | /* | |
2683 | * Does a critical section need to be broken due to another | |
95c354fe NP |
2684 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2685 | * but a general need for low latency) | |
1da177e4 | 2686 | */ |
95c354fe | 2687 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2688 | { |
95c354fe NP |
2689 | #ifdef CONFIG_PREEMPT |
2690 | return spin_is_contended(lock); | |
2691 | #else | |
1da177e4 | 2692 | return 0; |
95c354fe | 2693 | #endif |
1da177e4 LT |
2694 | } |
2695 | ||
f06febc9 FM |
2696 | /* |
2697 | * Thread group CPU time accounting. | |
2698 | */ | |
4cd4c1b4 | 2699 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
4da94d49 | 2700 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
f06febc9 | 2701 | |
490dea45 | 2702 | static inline void thread_group_cputime_init(struct signal_struct *sig) |
f06febc9 | 2703 | { |
ee30a7b2 | 2704 | raw_spin_lock_init(&sig->cputimer.lock); |
f06febc9 FM |
2705 | } |
2706 | ||
7bb44ade RM |
2707 | /* |
2708 | * Reevaluate whether the task has signals pending delivery. | |
2709 | * Wake the task if so. | |
2710 | * This is required every time the blocked sigset_t changes. | |
2711 | * callers must hold sighand->siglock. | |
2712 | */ | |
2713 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
2714 | extern void recalc_sigpending(void); |
2715 | ||
2716 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); | |
2717 | ||
2718 | /* | |
2719 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2720 | */ | |
2721 | #ifdef CONFIG_SMP | |
2722 | ||
2723 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2724 | { | |
a1261f54 | 2725 | return task_thread_info(p)->cpu; |
1da177e4 LT |
2726 | } |
2727 | ||
c65cc870 | 2728 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2729 | |
2730 | #else | |
2731 | ||
2732 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2733 | { | |
2734 | return 0; | |
2735 | } | |
2736 | ||
2737 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2738 | { | |
2739 | } | |
2740 | ||
2741 | #endif /* CONFIG_SMP */ | |
2742 | ||
96f874e2 RR |
2743 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2744 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2745 | |
1da177e4 LT |
2746 | extern void normalize_rt_tasks(void); |
2747 | ||
7c941438 | 2748 | #ifdef CONFIG_CGROUP_SCHED |
9b5b7751 | 2749 | |
07e06b01 | 2750 | extern struct task_group root_task_group; |
9b5b7751 | 2751 | |
ec7dc8ac | 2752 | extern struct task_group *sched_create_group(struct task_group *parent); |
4cf86d77 | 2753 | extern void sched_destroy_group(struct task_group *tg); |
9b5b7751 | 2754 | extern void sched_move_task(struct task_struct *tsk); |
052f1dc7 | 2755 | #ifdef CONFIG_FAIR_GROUP_SCHED |
4cf86d77 | 2756 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); |
5cb350ba | 2757 | extern unsigned long sched_group_shares(struct task_group *tg); |
052f1dc7 PZ |
2758 | #endif |
2759 | #ifdef CONFIG_RT_GROUP_SCHED | |
9f0c1e56 PZ |
2760 | extern int sched_group_set_rt_runtime(struct task_group *tg, |
2761 | long rt_runtime_us); | |
2762 | extern long sched_group_rt_runtime(struct task_group *tg); | |
d0b27fa7 PZ |
2763 | extern int sched_group_set_rt_period(struct task_group *tg, |
2764 | long rt_period_us); | |
2765 | extern long sched_group_rt_period(struct task_group *tg); | |
54e99124 | 2766 | extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); |
052f1dc7 | 2767 | #endif |
8323f26c | 2768 | #endif /* CONFIG_CGROUP_SCHED */ |
9b5b7751 | 2769 | |
54e99124 DG |
2770 | extern int task_can_switch_user(struct user_struct *up, |
2771 | struct task_struct *tsk); | |
2772 | ||
4b98d11b AD |
2773 | #ifdef CONFIG_TASK_XACCT |
2774 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2775 | { | |
940389b8 | 2776 | tsk->ioac.rchar += amt; |
4b98d11b AD |
2777 | } |
2778 | ||
2779 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2780 | { | |
940389b8 | 2781 | tsk->ioac.wchar += amt; |
4b98d11b AD |
2782 | } |
2783 | ||
2784 | static inline void inc_syscr(struct task_struct *tsk) | |
2785 | { | |
940389b8 | 2786 | tsk->ioac.syscr++; |
4b98d11b AD |
2787 | } |
2788 | ||
2789 | static inline void inc_syscw(struct task_struct *tsk) | |
2790 | { | |
940389b8 | 2791 | tsk->ioac.syscw++; |
4b98d11b AD |
2792 | } |
2793 | #else | |
2794 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2795 | { | |
2796 | } | |
2797 | ||
2798 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2799 | { | |
2800 | } | |
2801 | ||
2802 | static inline void inc_syscr(struct task_struct *tsk) | |
2803 | { | |
2804 | } | |
2805 | ||
2806 | static inline void inc_syscw(struct task_struct *tsk) | |
2807 | { | |
2808 | } | |
2809 | #endif | |
2810 | ||
82455257 DH |
2811 | #ifndef TASK_SIZE_OF |
2812 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2813 | #endif | |
2814 | ||
cf475ad2 BS |
2815 | #ifdef CONFIG_MM_OWNER |
2816 | extern void mm_update_next_owner(struct mm_struct *mm); | |
2817 | extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); | |
2818 | #else | |
2819 | static inline void mm_update_next_owner(struct mm_struct *mm) | |
2820 | { | |
2821 | } | |
2822 | ||
2823 | static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) | |
2824 | { | |
2825 | } | |
2826 | #endif /* CONFIG_MM_OWNER */ | |
2827 | ||
3e10e716 JS |
2828 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
2829 | unsigned int limit) | |
2830 | { | |
2831 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); | |
2832 | } | |
2833 | ||
2834 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, | |
2835 | unsigned int limit) | |
2836 | { | |
2837 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); | |
2838 | } | |
2839 | ||
2840 | static inline unsigned long rlimit(unsigned int limit) | |
2841 | { | |
2842 | return task_rlimit(current, limit); | |
2843 | } | |
2844 | ||
2845 | static inline unsigned long rlimit_max(unsigned int limit) | |
2846 | { | |
2847 | return task_rlimit_max(current, limit); | |
2848 | } | |
2849 | ||
1da177e4 | 2850 | #endif |