1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_CGROUP_H
3 #define _LINUX_CGROUP_H
7 * Copyright (C) 2003 BULL SA
8 * Copyright (C) 2004-2006 Silicon Graphics, Inc.
12 #include <linux/sched.h>
13 #include <linux/cpumask.h>
14 #include <linux/nodemask.h>
15 #include <linux/rculist.h>
16 #include <linux/cgroupstats.h>
18 #include <linux/seq_file.h>
19 #include <linux/kernfs.h>
20 #include <linux/jump_label.h>
21 #include <linux/types.h>
22 #include <linux/ns_common.h>
23 #include <linux/nsproxy.h>
24 #include <linux/user_namespace.h>
25 #include <linux/refcount.h>
26 #include <linux/kernel_stat.h>
28 #include <linux/cgroup-defs.h>
33 * All weight knobs on the default hierarhcy should use the following min,
34 * default and max values. The default value is the logarithmic center of
35 * MIN and MAX and allows 100x to be expressed in both directions.
37 #define CGROUP_WEIGHT_MIN 1
38 #define CGROUP_WEIGHT_DFL 100
39 #define CGROUP_WEIGHT_MAX 10000
41 /* walk only threadgroup leaders */
42 #define CSS_TASK_ITER_PROCS (1U << 0)
43 /* walk all threaded css_sets in the domain */
44 #define CSS_TASK_ITER_THREADED (1U << 1)
46 /* a css_task_iter should be treated as an opaque object */
47 struct css_task_iter
{
48 struct cgroup_subsys
*ss
;
51 struct list_head
*cset_pos
;
52 struct list_head
*cset_head
;
54 struct list_head
*tcset_pos
;
55 struct list_head
*tcset_head
;
57 struct list_head
*task_pos
;
58 struct list_head
*tasks_head
;
59 struct list_head
*mg_tasks_head
;
61 struct css_set
*cur_cset
;
62 struct css_set
*cur_dcset
;
63 struct task_struct
*cur_task
;
64 struct list_head iters_node
; /* css_set->task_iters */
67 extern struct cgroup_root cgrp_dfl_root
;
68 extern struct css_set init_css_set
;
70 #define SUBSYS(_x) extern struct cgroup_subsys _x ## _cgrp_subsys;
71 #include <linux/cgroup_subsys.h>
75 extern struct static_key_true _x ## _cgrp_subsys_enabled_key; \
76 extern struct static_key_true _x ## _cgrp_subsys_on_dfl_key;
77 #include <linux/cgroup_subsys.h>
81 * cgroup_subsys_enabled - fast test on whether a subsys is enabled
82 * @ss: subsystem in question
84 #define cgroup_subsys_enabled(ss) \
85 static_branch_likely(&ss ## _enabled_key)
88 * cgroup_subsys_on_dfl - fast test on whether a subsys is on default hierarchy
89 * @ss: subsystem in question
91 #define cgroup_subsys_on_dfl(ss) \
92 static_branch_likely(&ss ## _on_dfl_key)
94 bool css_has_online_children(struct cgroup_subsys_state
*css
);
95 struct cgroup_subsys_state
*css_from_id(int id
, struct cgroup_subsys
*ss
);
96 struct cgroup_subsys_state
*cgroup_get_e_css(struct cgroup
*cgroup
,
97 struct cgroup_subsys
*ss
);
98 struct cgroup_subsys_state
*css_tryget_online_from_dir(struct dentry
*dentry
,
99 struct cgroup_subsys
*ss
);
101 struct cgroup
*cgroup_get_from_path(const char *path
);
102 struct cgroup
*cgroup_get_from_fd(int fd
);
104 int cgroup_attach_task_all(struct task_struct
*from
, struct task_struct
*);
105 int cgroup_transfer_tasks(struct cgroup
*to
, struct cgroup
*from
);
107 int cgroup_add_dfl_cftypes(struct cgroup_subsys
*ss
, struct cftype
*cfts
);
108 int cgroup_add_legacy_cftypes(struct cgroup_subsys
*ss
, struct cftype
*cfts
);
109 int cgroup_rm_cftypes(struct cftype
*cfts
);
110 void cgroup_file_notify(struct cgroup_file
*cfile
);
112 int task_cgroup_path(struct task_struct
*task
, char *buf
, size_t buflen
);
113 int cgroupstats_build(struct cgroupstats
*stats
, struct dentry
*dentry
);
114 int proc_cgroup_show(struct seq_file
*m
, struct pid_namespace
*ns
,
115 struct pid
*pid
, struct task_struct
*tsk
);
117 void cgroup_fork(struct task_struct
*p
);
118 extern int cgroup_can_fork(struct task_struct
*p
);
119 extern void cgroup_cancel_fork(struct task_struct
*p
);
120 extern void cgroup_post_fork(struct task_struct
*p
);
121 void cgroup_exit(struct task_struct
*p
);
122 void cgroup_free(struct task_struct
*p
);
124 int cgroup_init_early(void);
125 int cgroup_init(void);
128 * Iteration helpers and macros.
131 struct cgroup_subsys_state
*css_next_child(struct cgroup_subsys_state
*pos
,
132 struct cgroup_subsys_state
*parent
);
133 struct cgroup_subsys_state
*css_next_descendant_pre(struct cgroup_subsys_state
*pos
,
134 struct cgroup_subsys_state
*css
);
135 struct cgroup_subsys_state
*css_rightmost_descendant(struct cgroup_subsys_state
*pos
);
136 struct cgroup_subsys_state
*css_next_descendant_post(struct cgroup_subsys_state
*pos
,
137 struct cgroup_subsys_state
*css
);
139 struct task_struct
*cgroup_taskset_first(struct cgroup_taskset
*tset
,
140 struct cgroup_subsys_state
**dst_cssp
);
141 struct task_struct
*cgroup_taskset_next(struct cgroup_taskset
*tset
,
142 struct cgroup_subsys_state
**dst_cssp
);
144 void css_task_iter_start(struct cgroup_subsys_state
*css
, unsigned int flags
,
145 struct css_task_iter
*it
);
146 struct task_struct
*css_task_iter_next(struct css_task_iter
*it
);
147 void css_task_iter_end(struct css_task_iter
*it
);
150 * css_for_each_child - iterate through children of a css
151 * @pos: the css * to use as the loop cursor
152 * @parent: css whose children to walk
154 * Walk @parent's children. Must be called under rcu_read_lock().
156 * If a subsystem synchronizes ->css_online() and the start of iteration, a
157 * css which finished ->css_online() is guaranteed to be visible in the
158 * future iterations and will stay visible until the last reference is put.
159 * A css which hasn't finished ->css_online() or already finished
160 * ->css_offline() may show up during traversal. It's each subsystem's
161 * responsibility to synchronize against on/offlining.
163 * It is allowed to temporarily drop RCU read lock during iteration. The
164 * caller is responsible for ensuring that @pos remains accessible until
165 * the start of the next iteration by, for example, bumping the css refcnt.
167 #define css_for_each_child(pos, parent) \
168 for ((pos) = css_next_child(NULL, (parent)); (pos); \
169 (pos) = css_next_child((pos), (parent)))
172 * css_for_each_descendant_pre - pre-order walk of a css's descendants
173 * @pos: the css * to use as the loop cursor
174 * @root: css whose descendants to walk
176 * Walk @root's descendants. @root is included in the iteration and the
177 * first node to be visited. Must be called under rcu_read_lock().
179 * If a subsystem synchronizes ->css_online() and the start of iteration, a
180 * css which finished ->css_online() is guaranteed to be visible in the
181 * future iterations and will stay visible until the last reference is put.
182 * A css which hasn't finished ->css_online() or already finished
183 * ->css_offline() may show up during traversal. It's each subsystem's
184 * responsibility to synchronize against on/offlining.
186 * For example, the following guarantees that a descendant can't escape
187 * state updates of its ancestors.
191 * Lock @css's parent and @css;
192 * Inherit state from the parent;
196 * my_update_state(@css)
198 * css_for_each_descendant_pre(@pos, @css) {
201 * Update @css's state;
203 * Verify @pos is alive and inherit state from its parent;
208 * As long as the inheriting step, including checking the parent state, is
209 * enclosed inside @pos locking, double-locking the parent isn't necessary
210 * while inheriting. The state update to the parent is guaranteed to be
211 * visible by walking order and, as long as inheriting operations to the
212 * same @pos are atomic to each other, multiple updates racing each other
213 * still result in the correct state. It's guaranateed that at least one
214 * inheritance happens for any css after the latest update to its parent.
216 * If checking parent's state requires locking the parent, each inheriting
217 * iteration should lock and unlock both @pos->parent and @pos.
219 * Alternatively, a subsystem may choose to use a single global lock to
220 * synchronize ->css_online() and ->css_offline() against tree-walking
223 * It is allowed to temporarily drop RCU read lock during iteration. The
224 * caller is responsible for ensuring that @pos remains accessible until
225 * the start of the next iteration by, for example, bumping the css refcnt.
227 #define css_for_each_descendant_pre(pos, css) \
228 for ((pos) = css_next_descendant_pre(NULL, (css)); (pos); \
229 (pos) = css_next_descendant_pre((pos), (css)))
232 * css_for_each_descendant_post - post-order walk of a css's descendants
233 * @pos: the css * to use as the loop cursor
234 * @css: css whose descendants to walk
236 * Similar to css_for_each_descendant_pre() but performs post-order
237 * traversal instead. @root is included in the iteration and the last
238 * node to be visited.
240 * If a subsystem synchronizes ->css_online() and the start of iteration, a
241 * css which finished ->css_online() is guaranteed to be visible in the
242 * future iterations and will stay visible until the last reference is put.
243 * A css which hasn't finished ->css_online() or already finished
244 * ->css_offline() may show up during traversal. It's each subsystem's
245 * responsibility to synchronize against on/offlining.
247 * Note that the walk visibility guarantee example described in pre-order
248 * walk doesn't apply the same to post-order walks.
250 #define css_for_each_descendant_post(pos, css) \
251 for ((pos) = css_next_descendant_post(NULL, (css)); (pos); \
252 (pos) = css_next_descendant_post((pos), (css)))
255 * cgroup_taskset_for_each - iterate cgroup_taskset
256 * @task: the loop cursor
257 * @dst_css: the destination css
258 * @tset: taskset to iterate
260 * @tset may contain multiple tasks and they may belong to multiple
263 * On the v2 hierarchy, there may be tasks from multiple processes and they
264 * may not share the source or destination csses.
266 * On traditional hierarchies, when there are multiple tasks in @tset, if a
267 * task of a process is in @tset, all tasks of the process are in @tset.
268 * Also, all are guaranteed to share the same source and destination csses.
270 * Iteration is not in any specific order.
272 #define cgroup_taskset_for_each(task, dst_css, tset) \
273 for ((task) = cgroup_taskset_first((tset), &(dst_css)); \
275 (task) = cgroup_taskset_next((tset), &(dst_css)))
278 * cgroup_taskset_for_each_leader - iterate group leaders in a cgroup_taskset
279 * @leader: the loop cursor
280 * @dst_css: the destination css
281 * @tset: taskset to iterate
283 * Iterate threadgroup leaders of @tset. For single-task migrations, @tset
284 * may not contain any.
286 #define cgroup_taskset_for_each_leader(leader, dst_css, tset) \
287 for ((leader) = cgroup_taskset_first((tset), &(dst_css)); \
289 (leader) = cgroup_taskset_next((tset), &(dst_css))) \
290 if ((leader) != (leader)->group_leader) \
299 * css_get - obtain a reference on the specified css
302 * The caller must already have a reference.
304 static inline void css_get(struct cgroup_subsys_state
*css
)
306 if (!(css
->flags
& CSS_NO_REF
))
307 percpu_ref_get(&css
->refcnt
);
311 * css_get_many - obtain references on the specified css
313 * @n: number of references to get
315 * The caller must already have a reference.
317 static inline void css_get_many(struct cgroup_subsys_state
*css
, unsigned int n
)
319 if (!(css
->flags
& CSS_NO_REF
))
320 percpu_ref_get_many(&css
->refcnt
, n
);
324 * css_tryget - try to obtain a reference on the specified css
327 * Obtain a reference on @css unless it already has reached zero and is
328 * being released. This function doesn't care whether @css is on or
329 * offline. The caller naturally needs to ensure that @css is accessible
330 * but doesn't have to be holding a reference on it - IOW, RCU protected
331 * access is good enough for this function. Returns %true if a reference
332 * count was successfully obtained; %false otherwise.
334 static inline bool css_tryget(struct cgroup_subsys_state
*css
)
336 if (!(css
->flags
& CSS_NO_REF
))
337 return percpu_ref_tryget(&css
->refcnt
);
342 * css_tryget_online - try to obtain a reference on the specified css if online
345 * Obtain a reference on @css if it's online. The caller naturally needs
346 * to ensure that @css is accessible but doesn't have to be holding a
347 * reference on it - IOW, RCU protected access is good enough for this
348 * function. Returns %true if a reference count was successfully obtained;
351 static inline bool css_tryget_online(struct cgroup_subsys_state
*css
)
353 if (!(css
->flags
& CSS_NO_REF
))
354 return percpu_ref_tryget_live(&css
->refcnt
);
359 * css_is_dying - test whether the specified css is dying
362 * Test whether @css is in the process of offlining or already offline. In
363 * most cases, ->css_online() and ->css_offline() callbacks should be
364 * enough; however, the actual offline operations are RCU delayed and this
365 * test returns %true also when @css is scheduled to be offlined.
367 * This is useful, for example, when the use case requires synchronous
368 * behavior with respect to cgroup removal. cgroup removal schedules css
369 * offlining but the css can seem alive while the operation is being
370 * delayed. If the delay affects user visible semantics, this test can be
371 * used to resolve the situation.
373 static inline bool css_is_dying(struct cgroup_subsys_state
*css
)
375 return !(css
->flags
& CSS_NO_REF
) && percpu_ref_is_dying(&css
->refcnt
);
379 * css_put - put a css reference
382 * Put a reference obtained via css_get() and css_tryget_online().
384 static inline void css_put(struct cgroup_subsys_state
*css
)
386 if (!(css
->flags
& CSS_NO_REF
))
387 percpu_ref_put(&css
->refcnt
);
391 * css_put_many - put css references
393 * @n: number of references to put
395 * Put references obtained via css_get() and css_tryget_online().
397 static inline void css_put_many(struct cgroup_subsys_state
*css
, unsigned int n
)
399 if (!(css
->flags
& CSS_NO_REF
))
400 percpu_ref_put_many(&css
->refcnt
, n
);
403 static inline void cgroup_get(struct cgroup
*cgrp
)
405 css_get(&cgrp
->self
);
408 static inline bool cgroup_tryget(struct cgroup
*cgrp
)
410 return css_tryget(&cgrp
->self
);
413 static inline void cgroup_put(struct cgroup
*cgrp
)
415 css_put(&cgrp
->self
);
419 * task_css_set_check - obtain a task's css_set with extra access conditions
420 * @task: the task to obtain css_set for
421 * @__c: extra condition expression to be passed to rcu_dereference_check()
423 * A task's css_set is RCU protected, initialized and exited while holding
424 * task_lock(), and can only be modified while holding both cgroup_mutex
425 * and task_lock() while the task is alive. This macro verifies that the
426 * caller is inside proper critical section and returns @task's css_set.
428 * The caller can also specify additional allowed conditions via @__c, such
429 * as locks used during the cgroup_subsys::attach() methods.
431 #ifdef CONFIG_PROVE_RCU
432 extern struct mutex cgroup_mutex
;
433 extern spinlock_t css_set_lock
;
434 #define task_css_set_check(task, __c) \
435 rcu_dereference_check((task)->cgroups, \
436 lockdep_is_held(&cgroup_mutex) || \
437 lockdep_is_held(&css_set_lock) || \
438 ((task)->flags & PF_EXITING) || (__c))
440 #define task_css_set_check(task, __c) \
441 rcu_dereference((task)->cgroups)
445 * task_css_check - obtain css for (task, subsys) w/ extra access conds
446 * @task: the target task
447 * @subsys_id: the target subsystem ID
448 * @__c: extra condition expression to be passed to rcu_dereference_check()
450 * Return the cgroup_subsys_state for the (@task, @subsys_id) pair. The
451 * synchronization rules are the same as task_css_set_check().
453 #define task_css_check(task, subsys_id, __c) \
454 task_css_set_check((task), (__c))->subsys[(subsys_id)]
457 * task_css_set - obtain a task's css_set
458 * @task: the task to obtain css_set for
460 * See task_css_set_check().
462 static inline struct css_set
*task_css_set(struct task_struct
*task
)
464 return task_css_set_check(task
, false);
468 * task_css - obtain css for (task, subsys)
469 * @task: the target task
470 * @subsys_id: the target subsystem ID
472 * See task_css_check().
474 static inline struct cgroup_subsys_state
*task_css(struct task_struct
*task
,
477 return task_css_check(task
, subsys_id
, false);
481 * task_get_css - find and get the css for (task, subsys)
482 * @task: the target task
483 * @subsys_id: the target subsystem ID
485 * Find the css for the (@task, @subsys_id) combination, increment a
486 * reference on and return it. This function is guaranteed to return a
489 static inline struct cgroup_subsys_state
*
490 task_get_css(struct task_struct
*task
, int subsys_id
)
492 struct cgroup_subsys_state
*css
;
496 css
= task_css(task
, subsys_id
);
497 if (likely(css_tryget_online(css
)))
506 * task_css_is_root - test whether a task belongs to the root css
507 * @task: the target task
508 * @subsys_id: the target subsystem ID
510 * Test whether @task belongs to the root css on the specified subsystem.
511 * May be invoked in any context.
513 static inline bool task_css_is_root(struct task_struct
*task
, int subsys_id
)
515 return task_css_check(task
, subsys_id
, true) ==
516 init_css_set
.subsys
[subsys_id
];
519 static inline struct cgroup
*task_cgroup(struct task_struct
*task
,
522 return task_css(task
, subsys_id
)->cgroup
;
525 static inline struct cgroup
*task_dfl_cgroup(struct task_struct
*task
)
527 return task_css_set(task
)->dfl_cgrp
;
530 static inline struct cgroup
*cgroup_parent(struct cgroup
*cgrp
)
532 struct cgroup_subsys_state
*parent_css
= cgrp
->self
.parent
;
535 return container_of(parent_css
, struct cgroup
, self
);
540 * cgroup_is_descendant - test ancestry
541 * @cgrp: the cgroup to be tested
542 * @ancestor: possible ancestor of @cgrp
544 * Test whether @cgrp is a descendant of @ancestor. It also returns %true
545 * if @cgrp == @ancestor. This function is safe to call as long as @cgrp
546 * and @ancestor are accessible.
548 static inline bool cgroup_is_descendant(struct cgroup
*cgrp
,
549 struct cgroup
*ancestor
)
551 if (cgrp
->root
!= ancestor
->root
|| cgrp
->level
< ancestor
->level
)
553 return cgrp
->ancestor_ids
[ancestor
->level
] == ancestor
->id
;
557 * cgroup_ancestor - find ancestor of cgroup
558 * @cgrp: cgroup to find ancestor of
559 * @ancestor_level: level of ancestor to find starting from root
561 * Find ancestor of cgroup at specified level starting from root if it exists
562 * and return pointer to it. Return NULL if @cgrp doesn't have ancestor at
565 * This function is safe to call as long as @cgrp is accessible.
567 static inline struct cgroup
*cgroup_ancestor(struct cgroup
*cgrp
,
570 if (cgrp
->level
< ancestor_level
)
572 while (cgrp
&& cgrp
->level
> ancestor_level
)
573 cgrp
= cgroup_parent(cgrp
);
578 * task_under_cgroup_hierarchy - test task's membership of cgroup ancestry
579 * @task: the task to be tested
580 * @ancestor: possible ancestor of @task's cgroup
582 * Tests whether @task's default cgroup hierarchy is a descendant of @ancestor.
583 * It follows all the same rules as cgroup_is_descendant, and only applies
584 * to the default hierarchy.
586 static inline bool task_under_cgroup_hierarchy(struct task_struct
*task
,
587 struct cgroup
*ancestor
)
589 struct css_set
*cset
= task_css_set(task
);
591 return cgroup_is_descendant(cset
->dfl_cgrp
, ancestor
);
594 /* no synchronization, the result can only be used as a hint */
595 static inline bool cgroup_is_populated(struct cgroup
*cgrp
)
597 return cgrp
->nr_populated_csets
+ cgrp
->nr_populated_domain_children
+
598 cgrp
->nr_populated_threaded_children
;
601 /* returns ino associated with a cgroup */
602 static inline ino_t
cgroup_ino(struct cgroup
*cgrp
)
604 return cgrp
->kn
->id
.ino
;
607 /* cft/css accessors for cftype->write() operation */
608 static inline struct cftype
*of_cft(struct kernfs_open_file
*of
)
613 struct cgroup_subsys_state
*of_css(struct kernfs_open_file
*of
);
615 /* cft/css accessors for cftype->seq_*() operations */
616 static inline struct cftype
*seq_cft(struct seq_file
*seq
)
618 return of_cft(seq
->private);
621 static inline struct cgroup_subsys_state
*seq_css(struct seq_file
*seq
)
623 return of_css(seq
->private);
627 * Name / path handling functions. All are thin wrappers around the kernfs
628 * counterparts and can be called under any context.
631 static inline int cgroup_name(struct cgroup
*cgrp
, char *buf
, size_t buflen
)
633 return kernfs_name(cgrp
->kn
, buf
, buflen
);
636 static inline int cgroup_path(struct cgroup
*cgrp
, char *buf
, size_t buflen
)
638 return kernfs_path(cgrp
->kn
, buf
, buflen
);
641 static inline void pr_cont_cgroup_name(struct cgroup
*cgrp
)
643 pr_cont_kernfs_name(cgrp
->kn
);
646 static inline void pr_cont_cgroup_path(struct cgroup
*cgrp
)
648 pr_cont_kernfs_path(cgrp
->kn
);
651 static inline struct psi_group
*cgroup_psi(struct cgroup
*cgrp
)
656 static inline void cgroup_init_kthreadd(void)
659 * kthreadd is inherited by all kthreads, keep it in the root so
660 * that the new kthreads are guaranteed to stay in the root until
661 * initialization is finished.
663 current
->no_cgroup_migration
= 1;
666 static inline void cgroup_kthread_ready(void)
669 * This kthread finished initialization. The creator should have
670 * set PF_NO_SETAFFINITY if this kthread should stay in the root.
672 current
->no_cgroup_migration
= 0;
675 static inline union kernfs_node_id
*cgroup_get_kernfs_id(struct cgroup
*cgrp
)
677 return &cgrp
->kn
->id
;
680 void cgroup_path_from_kernfs_id(const union kernfs_node_id
*id
,
681 char *buf
, size_t buflen
);
682 #else /* !CONFIG_CGROUPS */
684 struct cgroup_subsys_state
;
687 static inline void css_put(struct cgroup_subsys_state
*css
) {}
688 static inline int cgroup_attach_task_all(struct task_struct
*from
,
689 struct task_struct
*t
) { return 0; }
690 static inline int cgroupstats_build(struct cgroupstats
*stats
,
691 struct dentry
*dentry
) { return -EINVAL
; }
693 static inline void cgroup_fork(struct task_struct
*p
) {}
694 static inline int cgroup_can_fork(struct task_struct
*p
) { return 0; }
695 static inline void cgroup_cancel_fork(struct task_struct
*p
) {}
696 static inline void cgroup_post_fork(struct task_struct
*p
) {}
697 static inline void cgroup_exit(struct task_struct
*p
) {}
698 static inline void cgroup_free(struct task_struct
*p
) {}
700 static inline int cgroup_init_early(void) { return 0; }
701 static inline int cgroup_init(void) { return 0; }
702 static inline void cgroup_init_kthreadd(void) {}
703 static inline void cgroup_kthread_ready(void) {}
704 static inline union kernfs_node_id
*cgroup_get_kernfs_id(struct cgroup
*cgrp
)
709 static inline struct cgroup
*cgroup_parent(struct cgroup
*cgrp
)
714 static inline struct psi_group
*cgroup_psi(struct cgroup
*cgrp
)
719 static inline bool task_under_cgroup_hierarchy(struct task_struct
*task
,
720 struct cgroup
*ancestor
)
725 static inline void cgroup_path_from_kernfs_id(const union kernfs_node_id
*id
,
726 char *buf
, size_t buflen
) {}
727 #endif /* !CONFIG_CGROUPS */
729 #ifdef CONFIG_CGROUPS
731 * cgroup scalable recursive statistics.
733 void cgroup_rstat_updated(struct cgroup
*cgrp
, int cpu
);
734 void cgroup_rstat_flush(struct cgroup
*cgrp
);
735 void cgroup_rstat_flush_irqsafe(struct cgroup
*cgrp
);
736 void cgroup_rstat_flush_hold(struct cgroup
*cgrp
);
737 void cgroup_rstat_flush_release(void);
740 * Basic resource stats.
742 #ifdef CONFIG_CGROUP_CPUACCT
743 void cpuacct_charge(struct task_struct
*tsk
, u64 cputime
);
744 void cpuacct_account_field(struct task_struct
*tsk
, int index
, u64 val
);
746 static inline void cpuacct_charge(struct task_struct
*tsk
, u64 cputime
) {}
747 static inline void cpuacct_account_field(struct task_struct
*tsk
, int index
,
751 void __cgroup_account_cputime(struct cgroup
*cgrp
, u64 delta_exec
);
752 void __cgroup_account_cputime_field(struct cgroup
*cgrp
,
753 enum cpu_usage_stat index
, u64 delta_exec
);
755 static inline void cgroup_account_cputime(struct task_struct
*task
,
760 cpuacct_charge(task
, delta_exec
);
763 cgrp
= task_dfl_cgroup(task
);
764 if (cgroup_parent(cgrp
))
765 __cgroup_account_cputime(cgrp
, delta_exec
);
769 static inline void cgroup_account_cputime_field(struct task_struct
*task
,
770 enum cpu_usage_stat index
,
775 cpuacct_account_field(task
, index
, delta_exec
);
778 cgrp
= task_dfl_cgroup(task
);
779 if (cgroup_parent(cgrp
))
780 __cgroup_account_cputime_field(cgrp
, index
, delta_exec
);
784 #else /* CONFIG_CGROUPS */
786 static inline void cgroup_account_cputime(struct task_struct
*task
,
788 static inline void cgroup_account_cputime_field(struct task_struct
*task
,
789 enum cpu_usage_stat index
,
792 #endif /* CONFIG_CGROUPS */
795 * sock->sk_cgrp_data handling. For more info, see sock_cgroup_data
796 * definition in cgroup-defs.h.
798 #ifdef CONFIG_SOCK_CGROUP_DATA
800 #if defined(CONFIG_CGROUP_NET_PRIO) || defined(CONFIG_CGROUP_NET_CLASSID)
801 extern spinlock_t cgroup_sk_update_lock
;
804 void cgroup_sk_alloc_disable(void);
805 void cgroup_sk_alloc(struct sock_cgroup_data
*skcd
);
806 void cgroup_sk_free(struct sock_cgroup_data
*skcd
);
808 static inline struct cgroup
*sock_cgroup_ptr(struct sock_cgroup_data
*skcd
)
810 #if defined(CONFIG_CGROUP_NET_PRIO) || defined(CONFIG_CGROUP_NET_CLASSID)
814 * @skcd->val is 64bit but the following is safe on 32bit too as we
815 * just need the lower ulong to be written and read atomically.
817 v
= READ_ONCE(skcd
->val
);
820 return &cgrp_dfl_root
.cgrp
;
822 return (struct cgroup
*)(unsigned long)v
?: &cgrp_dfl_root
.cgrp
;
824 return (struct cgroup
*)(unsigned long)skcd
->val
;
828 #else /* CONFIG_CGROUP_DATA */
830 static inline void cgroup_sk_alloc(struct sock_cgroup_data
*skcd
) {}
831 static inline void cgroup_sk_free(struct sock_cgroup_data
*skcd
) {}
833 #endif /* CONFIG_CGROUP_DATA */
835 struct cgroup_namespace
{
838 struct user_namespace
*user_ns
;
839 struct ucounts
*ucounts
;
840 struct css_set
*root_cset
;
843 extern struct cgroup_namespace init_cgroup_ns
;
845 #ifdef CONFIG_CGROUPS
847 void free_cgroup_ns(struct cgroup_namespace
*ns
);
849 struct cgroup_namespace
*copy_cgroup_ns(unsigned long flags
,
850 struct user_namespace
*user_ns
,
851 struct cgroup_namespace
*old_ns
);
853 int cgroup_path_ns(struct cgroup
*cgrp
, char *buf
, size_t buflen
,
854 struct cgroup_namespace
*ns
);
856 #else /* !CONFIG_CGROUPS */
858 static inline void free_cgroup_ns(struct cgroup_namespace
*ns
) { }
859 static inline struct cgroup_namespace
*
860 copy_cgroup_ns(unsigned long flags
, struct user_namespace
*user_ns
,
861 struct cgroup_namespace
*old_ns
)
866 #endif /* !CONFIG_CGROUPS */
868 static inline void get_cgroup_ns(struct cgroup_namespace
*ns
)
871 refcount_inc(&ns
->count
);
874 static inline void put_cgroup_ns(struct cgroup_namespace
*ns
)
876 if (ns
&& refcount_dec_and_test(&ns
->count
))
880 #endif /* _LINUX_CGROUP_H */