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>
30 struct kernel_clone_args;
35 * All weight knobs on the default hierarchy should use the following min,
36 * default and max values. The default value is the logarithmic center of
37 * MIN and MAX and allows 100x to be expressed in both directions.
39 #define CGROUP_WEIGHT_MIN 1
40 #define CGROUP_WEIGHT_DFL 100
41 #define CGROUP_WEIGHT_MAX 10000
43 /* walk only threadgroup leaders */
44 #define CSS_TASK_ITER_PROCS (1U << 0)
45 /* walk all threaded css_sets in the domain */
46 #define CSS_TASK_ITER_THREADED (1U << 1)
49 #define CSS_TASK_ITER_SKIPPED (1U << 16)
51 /* a css_task_iter should be treated as an opaque object */
52 struct css_task_iter {
53 struct cgroup_subsys *ss;
56 struct list_head *cset_pos;
57 struct list_head *cset_head;
59 struct list_head *tcset_pos;
60 struct list_head *tcset_head;
62 struct list_head *task_pos;
64 struct list_head *cur_tasks_head;
65 struct css_set *cur_cset;
66 struct css_set *cur_dcset;
67 struct task_struct *cur_task;
68 struct list_head iters_node; /* css_set->task_iters */
71 extern struct cgroup_root cgrp_dfl_root;
72 extern struct css_set init_css_set;
74 #define SUBSYS(_x) extern struct cgroup_subsys _x ## _cgrp_subsys;
75 #include <linux/cgroup_subsys.h>
79 extern struct static_key_true _x ## _cgrp_subsys_enabled_key; \
80 extern struct static_key_true _x ## _cgrp_subsys_on_dfl_key;
81 #include <linux/cgroup_subsys.h>
85 * cgroup_subsys_enabled - fast test on whether a subsys is enabled
86 * @ss: subsystem in question
88 #define cgroup_subsys_enabled(ss) \
89 static_branch_likely(&ss ## _enabled_key)
92 * cgroup_subsys_on_dfl - fast test on whether a subsys is on default hierarchy
93 * @ss: subsystem in question
95 #define cgroup_subsys_on_dfl(ss) \
96 static_branch_likely(&ss ## _on_dfl_key)
98 bool css_has_online_children(struct cgroup_subsys_state *css);
99 struct cgroup_subsys_state *css_from_id(int id, struct cgroup_subsys *ss);
100 struct cgroup_subsys_state *cgroup_e_css(struct cgroup *cgroup,
101 struct cgroup_subsys *ss);
102 struct cgroup_subsys_state *cgroup_get_e_css(struct cgroup *cgroup,
103 struct cgroup_subsys *ss);
104 struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry,
105 struct cgroup_subsys *ss);
107 struct cgroup *cgroup_get_from_path(const char *path);
108 struct cgroup *cgroup_get_from_fd(int fd);
109 struct cgroup *cgroup_v1v2_get_from_fd(int fd);
111 int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
112 int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);
114 int cgroup_add_dfl_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
115 int cgroup_add_legacy_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
116 int cgroup_rm_cftypes(struct cftype *cfts);
117 void cgroup_file_notify(struct cgroup_file *cfile);
118 void cgroup_file_show(struct cgroup_file *cfile, bool show);
120 int task_cgroup_path(struct task_struct *task, char *buf, size_t buflen);
121 int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry);
122 int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
123 struct pid *pid, struct task_struct *tsk);
125 void cgroup_fork(struct task_struct *p);
126 extern int cgroup_can_fork(struct task_struct *p,
127 struct kernel_clone_args *kargs);
128 extern void cgroup_cancel_fork(struct task_struct *p,
129 struct kernel_clone_args *kargs);
130 extern void cgroup_post_fork(struct task_struct *p,
131 struct kernel_clone_args *kargs);
132 void cgroup_exit(struct task_struct *p);
133 void cgroup_release(struct task_struct *p);
134 void cgroup_free(struct task_struct *p);
136 int cgroup_init_early(void);
137 int cgroup_init(void);
139 int cgroup_parse_float(const char *input, unsigned dec_shift, s64 *v);
142 * Iteration helpers and macros.
145 struct cgroup_subsys_state *css_next_child(struct cgroup_subsys_state *pos,
146 struct cgroup_subsys_state *parent);
147 struct cgroup_subsys_state *css_next_descendant_pre(struct cgroup_subsys_state *pos,
148 struct cgroup_subsys_state *css);
149 struct cgroup_subsys_state *css_rightmost_descendant(struct cgroup_subsys_state *pos);
150 struct cgroup_subsys_state *css_next_descendant_post(struct cgroup_subsys_state *pos,
151 struct cgroup_subsys_state *css);
153 struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset,
154 struct cgroup_subsys_state **dst_cssp);
155 struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset,
156 struct cgroup_subsys_state **dst_cssp);
158 void css_task_iter_start(struct cgroup_subsys_state *css, unsigned int flags,
159 struct css_task_iter *it);
160 struct task_struct *css_task_iter_next(struct css_task_iter *it);
161 void css_task_iter_end(struct css_task_iter *it);
164 * css_for_each_child - iterate through children of a css
165 * @pos: the css * to use as the loop cursor
166 * @parent: css whose children to walk
168 * Walk @parent's children. Must be called under rcu_read_lock().
170 * If a subsystem synchronizes ->css_online() and the start of iteration, a
171 * css which finished ->css_online() is guaranteed to be visible in the
172 * future iterations and will stay visible until the last reference is put.
173 * A css which hasn't finished ->css_online() or already finished
174 * ->css_offline() may show up during traversal. It's each subsystem's
175 * responsibility to synchronize against on/offlining.
177 * It is allowed to temporarily drop RCU read lock during iteration. The
178 * caller is responsible for ensuring that @pos remains accessible until
179 * the start of the next iteration by, for example, bumping the css refcnt.
181 #define css_for_each_child(pos, parent) \
182 for ((pos) = css_next_child(NULL, (parent)); (pos); \
183 (pos) = css_next_child((pos), (parent)))
186 * css_for_each_descendant_pre - pre-order walk of a css's descendants
187 * @pos: the css * to use as the loop cursor
188 * @root: css whose descendants to walk
190 * Walk @root's descendants. @root is included in the iteration and the
191 * first node to be visited. Must be called under rcu_read_lock().
193 * If a subsystem synchronizes ->css_online() and the start of iteration, a
194 * css which finished ->css_online() is guaranteed to be visible in the
195 * future iterations and will stay visible until the last reference is put.
196 * A css which hasn't finished ->css_online() or already finished
197 * ->css_offline() may show up during traversal. It's each subsystem's
198 * responsibility to synchronize against on/offlining.
200 * For example, the following guarantees that a descendant can't escape
201 * state updates of its ancestors.
205 * Lock @css's parent and @css;
206 * Inherit state from the parent;
210 * my_update_state(@css)
212 * css_for_each_descendant_pre(@pos, @css) {
215 * Update @css's state;
217 * Verify @pos is alive and inherit state from its parent;
222 * As long as the inheriting step, including checking the parent state, is
223 * enclosed inside @pos locking, double-locking the parent isn't necessary
224 * while inheriting. The state update to the parent is guaranteed to be
225 * visible by walking order and, as long as inheriting operations to the
226 * same @pos are atomic to each other, multiple updates racing each other
227 * still result in the correct state. It's guaranateed that at least one
228 * inheritance happens for any css after the latest update to its parent.
230 * If checking parent's state requires locking the parent, each inheriting
231 * iteration should lock and unlock both @pos->parent and @pos.
233 * Alternatively, a subsystem may choose to use a single global lock to
234 * synchronize ->css_online() and ->css_offline() against tree-walking
237 * It is allowed to temporarily drop RCU read lock during iteration. The
238 * caller is responsible for ensuring that @pos remains accessible until
239 * the start of the next iteration by, for example, bumping the css refcnt.
241 #define css_for_each_descendant_pre(pos, css) \
242 for ((pos) = css_next_descendant_pre(NULL, (css)); (pos); \
243 (pos) = css_next_descendant_pre((pos), (css)))
246 * css_for_each_descendant_post - post-order walk of a css's descendants
247 * @pos: the css * to use as the loop cursor
248 * @css: css whose descendants to walk
250 * Similar to css_for_each_descendant_pre() but performs post-order
251 * traversal instead. @root is included in the iteration and the last
252 * node to be visited.
254 * If a subsystem synchronizes ->css_online() and the start of iteration, a
255 * css which finished ->css_online() is guaranteed to be visible in the
256 * future iterations and will stay visible until the last reference is put.
257 * A css which hasn't finished ->css_online() or already finished
258 * ->css_offline() may show up during traversal. It's each subsystem's
259 * responsibility to synchronize against on/offlining.
261 * Note that the walk visibility guarantee example described in pre-order
262 * walk doesn't apply the same to post-order walks.
264 #define css_for_each_descendant_post(pos, css) \
265 for ((pos) = css_next_descendant_post(NULL, (css)); (pos); \
266 (pos) = css_next_descendant_post((pos), (css)))
269 * cgroup_taskset_for_each - iterate cgroup_taskset
270 * @task: the loop cursor
271 * @dst_css: the destination css
272 * @tset: taskset to iterate
274 * @tset may contain multiple tasks and they may belong to multiple
277 * On the v2 hierarchy, there may be tasks from multiple processes and they
278 * may not share the source or destination csses.
280 * On traditional hierarchies, when there are multiple tasks in @tset, if a
281 * task of a process is in @tset, all tasks of the process are in @tset.
282 * Also, all are guaranteed to share the same source and destination csses.
284 * Iteration is not in any specific order.
286 #define cgroup_taskset_for_each(task, dst_css, tset) \
287 for ((task) = cgroup_taskset_first((tset), &(dst_css)); \
289 (task) = cgroup_taskset_next((tset), &(dst_css)))
292 * cgroup_taskset_for_each_leader - iterate group leaders in a cgroup_taskset
293 * @leader: the loop cursor
294 * @dst_css: the destination css
295 * @tset: taskset to iterate
297 * Iterate threadgroup leaders of @tset. For single-task migrations, @tset
298 * may not contain any.
300 #define cgroup_taskset_for_each_leader(leader, dst_css, tset) \
301 for ((leader) = cgroup_taskset_first((tset), &(dst_css)); \
303 (leader) = cgroup_taskset_next((tset), &(dst_css))) \
304 if ((leader) != (leader)->group_leader) \
312 static inline u64 cgroup_id(const struct cgroup *cgrp)
318 * css_get - obtain a reference on the specified css
321 * The caller must already have a reference.
323 static inline void css_get(struct cgroup_subsys_state *css)
325 if (!(css->flags & CSS_NO_REF))
326 percpu_ref_get(&css->refcnt);
330 * css_get_many - obtain references on the specified css
332 * @n: number of references to get
334 * The caller must already have a reference.
336 static inline void css_get_many(struct cgroup_subsys_state *css, unsigned int n)
338 if (!(css->flags & CSS_NO_REF))
339 percpu_ref_get_many(&css->refcnt, n);
343 * css_tryget - try to obtain a reference on the specified css
346 * Obtain a reference on @css unless it already has reached zero and is
347 * being released. This function doesn't care whether @css is on or
348 * offline. The caller naturally needs to ensure that @css is accessible
349 * but doesn't have to be holding a reference on it - IOW, RCU protected
350 * access is good enough for this function. Returns %true if a reference
351 * count was successfully obtained; %false otherwise.
353 static inline bool css_tryget(struct cgroup_subsys_state *css)
355 if (!(css->flags & CSS_NO_REF))
356 return percpu_ref_tryget(&css->refcnt);
361 * css_tryget_online - try to obtain a reference on the specified css if online
364 * Obtain a reference on @css if it's online. The caller naturally needs
365 * to ensure that @css is accessible but doesn't have to be holding a
366 * reference on it - IOW, RCU protected access is good enough for this
367 * function. Returns %true if a reference count was successfully obtained;
370 static inline bool css_tryget_online(struct cgroup_subsys_state *css)
372 if (!(css->flags & CSS_NO_REF))
373 return percpu_ref_tryget_live(&css->refcnt);
378 * css_is_dying - test whether the specified css is dying
381 * Test whether @css is in the process of offlining or already offline. In
382 * most cases, ->css_online() and ->css_offline() callbacks should be
383 * enough; however, the actual offline operations are RCU delayed and this
384 * test returns %true also when @css is scheduled to be offlined.
386 * This is useful, for example, when the use case requires synchronous
387 * behavior with respect to cgroup removal. cgroup removal schedules css
388 * offlining but the css can seem alive while the operation is being
389 * delayed. If the delay affects user visible semantics, this test can be
390 * used to resolve the situation.
392 static inline bool css_is_dying(struct cgroup_subsys_state *css)
394 return !(css->flags & CSS_NO_REF) && percpu_ref_is_dying(&css->refcnt);
398 * css_put - put a css reference
401 * Put a reference obtained via css_get() and css_tryget_online().
403 static inline void css_put(struct cgroup_subsys_state *css)
405 if (!(css->flags & CSS_NO_REF))
406 percpu_ref_put(&css->refcnt);
410 * css_put_many - put css references
412 * @n: number of references to put
414 * Put references obtained via css_get() and css_tryget_online().
416 static inline void css_put_many(struct cgroup_subsys_state *css, unsigned int n)
418 if (!(css->flags & CSS_NO_REF))
419 percpu_ref_put_many(&css->refcnt, n);
422 static inline void cgroup_get(struct cgroup *cgrp)
424 css_get(&cgrp->self);
427 static inline bool cgroup_tryget(struct cgroup *cgrp)
429 return css_tryget(&cgrp->self);
432 static inline void cgroup_put(struct cgroup *cgrp)
434 css_put(&cgrp->self);
437 extern struct mutex cgroup_mutex;
439 static inline void cgroup_lock(void)
441 mutex_lock(&cgroup_mutex);
444 static inline void cgroup_unlock(void)
446 mutex_unlock(&cgroup_mutex);
450 * task_css_set_check - obtain a task's css_set with extra access conditions
451 * @task: the task to obtain css_set for
452 * @__c: extra condition expression to be passed to rcu_dereference_check()
454 * A task's css_set is RCU protected, initialized and exited while holding
455 * task_lock(), and can only be modified while holding both cgroup_mutex
456 * and task_lock() while the task is alive. This macro verifies that the
457 * caller is inside proper critical section and returns @task's css_set.
459 * The caller can also specify additional allowed conditions via @__c, such
460 * as locks used during the cgroup_subsys::attach() methods.
462 #ifdef CONFIG_PROVE_RCU
463 extern spinlock_t css_set_lock;
464 #define task_css_set_check(task, __c) \
465 rcu_dereference_check((task)->cgroups, \
466 rcu_read_lock_sched_held() || \
467 lockdep_is_held(&cgroup_mutex) || \
468 lockdep_is_held(&css_set_lock) || \
469 ((task)->flags & PF_EXITING) || (__c))
471 #define task_css_set_check(task, __c) \
472 rcu_dereference((task)->cgroups)
476 * task_css_check - obtain css for (task, subsys) w/ extra access conds
477 * @task: the target task
478 * @subsys_id: the target subsystem ID
479 * @__c: extra condition expression to be passed to rcu_dereference_check()
481 * Return the cgroup_subsys_state for the (@task, @subsys_id) pair. The
482 * synchronization rules are the same as task_css_set_check().
484 #define task_css_check(task, subsys_id, __c) \
485 task_css_set_check((task), (__c))->subsys[(subsys_id)]
488 * task_css_set - obtain a task's css_set
489 * @task: the task to obtain css_set for
491 * See task_css_set_check().
493 static inline struct css_set *task_css_set(struct task_struct *task)
495 return task_css_set_check(task, false);
499 * task_css - obtain css for (task, subsys)
500 * @task: the target task
501 * @subsys_id: the target subsystem ID
503 * See task_css_check().
505 static inline struct cgroup_subsys_state *task_css(struct task_struct *task,
508 return task_css_check(task, subsys_id, false);
512 * task_get_css - find and get the css for (task, subsys)
513 * @task: the target task
514 * @subsys_id: the target subsystem ID
516 * Find the css for the (@task, @subsys_id) combination, increment a
517 * reference on and return it. This function is guaranteed to return a
518 * valid css. The returned css may already have been offlined.
520 static inline struct cgroup_subsys_state *
521 task_get_css(struct task_struct *task, int subsys_id)
523 struct cgroup_subsys_state *css;
527 css = task_css(task, subsys_id);
529 * Can't use css_tryget_online() here. A task which has
530 * PF_EXITING set may stay associated with an offline css.
531 * If such task calls this function, css_tryget_online()
534 if (likely(css_tryget(css)))
543 * task_css_is_root - test whether a task belongs to the root css
544 * @task: the target task
545 * @subsys_id: the target subsystem ID
547 * Test whether @task belongs to the root css on the specified subsystem.
548 * May be invoked in any context.
550 static inline bool task_css_is_root(struct task_struct *task, int subsys_id)
552 return task_css_check(task, subsys_id, true) ==
553 init_css_set.subsys[subsys_id];
556 static inline struct cgroup *task_cgroup(struct task_struct *task,
559 return task_css(task, subsys_id)->cgroup;
562 static inline struct cgroup *task_dfl_cgroup(struct task_struct *task)
564 return task_css_set(task)->dfl_cgrp;
567 static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)
569 struct cgroup_subsys_state *parent_css = cgrp->self.parent;
572 return container_of(parent_css, struct cgroup, self);
577 * cgroup_is_descendant - test ancestry
578 * @cgrp: the cgroup to be tested
579 * @ancestor: possible ancestor of @cgrp
581 * Test whether @cgrp is a descendant of @ancestor. It also returns %true
582 * if @cgrp == @ancestor. This function is safe to call as long as @cgrp
583 * and @ancestor are accessible.
585 static inline bool cgroup_is_descendant(struct cgroup *cgrp,
586 struct cgroup *ancestor)
588 if (cgrp->root != ancestor->root || cgrp->level < ancestor->level)
590 return cgrp->ancestors[ancestor->level] == ancestor;
594 * cgroup_ancestor - find ancestor of cgroup
595 * @cgrp: cgroup to find ancestor of
596 * @ancestor_level: level of ancestor to find starting from root
598 * Find ancestor of cgroup at specified level starting from root if it exists
599 * and return pointer to it. Return NULL if @cgrp doesn't have ancestor at
602 * This function is safe to call as long as @cgrp is accessible.
604 static inline struct cgroup *cgroup_ancestor(struct cgroup *cgrp,
607 if (ancestor_level < 0 || ancestor_level > cgrp->level)
609 return cgrp->ancestors[ancestor_level];
613 * task_under_cgroup_hierarchy - test task's membership of cgroup ancestry
614 * @task: the task to be tested
615 * @ancestor: possible ancestor of @task's cgroup
617 * Tests whether @task's default cgroup hierarchy is a descendant of @ancestor.
618 * It follows all the same rules as cgroup_is_descendant, and only applies
619 * to the default hierarchy.
621 static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
622 struct cgroup *ancestor)
624 struct css_set *cset = task_css_set(task);
626 return cgroup_is_descendant(cset->dfl_cgrp, ancestor);
629 /* no synchronization, the result can only be used as a hint */
630 static inline bool cgroup_is_populated(struct cgroup *cgrp)
632 return cgrp->nr_populated_csets + cgrp->nr_populated_domain_children +
633 cgrp->nr_populated_threaded_children;
636 /* returns ino associated with a cgroup */
637 static inline ino_t cgroup_ino(struct cgroup *cgrp)
639 return kernfs_ino(cgrp->kn);
642 /* cft/css accessors for cftype->write() operation */
643 static inline struct cftype *of_cft(struct kernfs_open_file *of)
648 struct cgroup_subsys_state *of_css(struct kernfs_open_file *of);
650 /* cft/css accessors for cftype->seq_*() operations */
651 static inline struct cftype *seq_cft(struct seq_file *seq)
653 return of_cft(seq->private);
656 static inline struct cgroup_subsys_state *seq_css(struct seq_file *seq)
658 return of_css(seq->private);
662 * Name / path handling functions. All are thin wrappers around the kernfs
663 * counterparts and can be called under any context.
666 static inline int cgroup_name(struct cgroup *cgrp, char *buf, size_t buflen)
668 return kernfs_name(cgrp->kn, buf, buflen);
671 static inline int cgroup_path(struct cgroup *cgrp, char *buf, size_t buflen)
673 return kernfs_path(cgrp->kn, buf, buflen);
676 static inline void pr_cont_cgroup_name(struct cgroup *cgrp)
678 pr_cont_kernfs_name(cgrp->kn);
681 static inline void pr_cont_cgroup_path(struct cgroup *cgrp)
683 pr_cont_kernfs_path(cgrp->kn);
686 bool cgroup_psi_enabled(void);
688 static inline void cgroup_init_kthreadd(void)
691 * kthreadd is inherited by all kthreads, keep it in the root so
692 * that the new kthreads are guaranteed to stay in the root until
693 * initialization is finished.
695 current->no_cgroup_migration = 1;
698 static inline void cgroup_kthread_ready(void)
701 * This kthread finished initialization. The creator should have
702 * set PF_NO_SETAFFINITY if this kthread should stay in the root.
704 current->no_cgroup_migration = 0;
707 void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen);
708 struct cgroup *cgroup_get_from_id(u64 id);
709 #else /* !CONFIG_CGROUPS */
711 struct cgroup_subsys_state;
714 static inline u64 cgroup_id(const struct cgroup *cgrp) { return 1; }
715 static inline void css_get(struct cgroup_subsys_state *css) {}
716 static inline void css_put(struct cgroup_subsys_state *css) {}
717 static inline void cgroup_lock(void) {}
718 static inline void cgroup_unlock(void) {}
719 static inline int cgroup_attach_task_all(struct task_struct *from,
720 struct task_struct *t) { return 0; }
721 static inline int cgroupstats_build(struct cgroupstats *stats,
722 struct dentry *dentry) { return -EINVAL; }
724 static inline void cgroup_fork(struct task_struct *p) {}
725 static inline int cgroup_can_fork(struct task_struct *p,
726 struct kernel_clone_args *kargs) { return 0; }
727 static inline void cgroup_cancel_fork(struct task_struct *p,
728 struct kernel_clone_args *kargs) {}
729 static inline void cgroup_post_fork(struct task_struct *p,
730 struct kernel_clone_args *kargs) {}
731 static inline void cgroup_exit(struct task_struct *p) {}
732 static inline void cgroup_release(struct task_struct *p) {}
733 static inline void cgroup_free(struct task_struct *p) {}
735 static inline int cgroup_init_early(void) { return 0; }
736 static inline int cgroup_init(void) { return 0; }
737 static inline void cgroup_init_kthreadd(void) {}
738 static inline void cgroup_kthread_ready(void) {}
740 static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)
745 static inline bool cgroup_psi_enabled(void)
750 static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
751 struct cgroup *ancestor)
756 static inline void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen)
758 #endif /* !CONFIG_CGROUPS */
760 #ifdef CONFIG_CGROUPS
762 * cgroup scalable recursive statistics.
764 void cgroup_rstat_updated(struct cgroup *cgrp, int cpu);
765 void cgroup_rstat_flush(struct cgroup *cgrp);
766 void cgroup_rstat_flush_irqsafe(struct cgroup *cgrp);
767 void cgroup_rstat_flush_hold(struct cgroup *cgrp);
768 void cgroup_rstat_flush_release(void);
771 * Basic resource stats.
773 #ifdef CONFIG_CGROUP_CPUACCT
774 void cpuacct_charge(struct task_struct *tsk, u64 cputime);
775 void cpuacct_account_field(struct task_struct *tsk, int index, u64 val);
777 static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {}
778 static inline void cpuacct_account_field(struct task_struct *tsk, int index,
782 void __cgroup_account_cputime(struct cgroup *cgrp, u64 delta_exec);
783 void __cgroup_account_cputime_field(struct cgroup *cgrp,
784 enum cpu_usage_stat index, u64 delta_exec);
786 static inline void cgroup_account_cputime(struct task_struct *task,
791 cpuacct_charge(task, delta_exec);
793 cgrp = task_dfl_cgroup(task);
794 if (cgroup_parent(cgrp))
795 __cgroup_account_cputime(cgrp, delta_exec);
798 static inline void cgroup_account_cputime_field(struct task_struct *task,
799 enum cpu_usage_stat index,
804 cpuacct_account_field(task, index, delta_exec);
806 cgrp = task_dfl_cgroup(task);
807 if (cgroup_parent(cgrp))
808 __cgroup_account_cputime_field(cgrp, index, delta_exec);
811 #else /* CONFIG_CGROUPS */
813 static inline void cgroup_account_cputime(struct task_struct *task,
815 static inline void cgroup_account_cputime_field(struct task_struct *task,
816 enum cpu_usage_stat index,
819 #endif /* CONFIG_CGROUPS */
822 * sock->sk_cgrp_data handling. For more info, see sock_cgroup_data
823 * definition in cgroup-defs.h.
825 #ifdef CONFIG_SOCK_CGROUP_DATA
827 void cgroup_sk_alloc(struct sock_cgroup_data *skcd);
828 void cgroup_sk_clone(struct sock_cgroup_data *skcd);
829 void cgroup_sk_free(struct sock_cgroup_data *skcd);
831 static inline struct cgroup *sock_cgroup_ptr(struct sock_cgroup_data *skcd)
836 #else /* CONFIG_CGROUP_DATA */
838 static inline void cgroup_sk_alloc(struct sock_cgroup_data *skcd) {}
839 static inline void cgroup_sk_clone(struct sock_cgroup_data *skcd) {}
840 static inline void cgroup_sk_free(struct sock_cgroup_data *skcd) {}
842 #endif /* CONFIG_CGROUP_DATA */
844 struct cgroup_namespace {
846 struct user_namespace *user_ns;
847 struct ucounts *ucounts;
848 struct css_set *root_cset;
851 extern struct cgroup_namespace init_cgroup_ns;
853 #ifdef CONFIG_CGROUPS
855 void free_cgroup_ns(struct cgroup_namespace *ns);
857 struct cgroup_namespace *copy_cgroup_ns(unsigned long flags,
858 struct user_namespace *user_ns,
859 struct cgroup_namespace *old_ns);
861 int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,
862 struct cgroup_namespace *ns);
864 #else /* !CONFIG_CGROUPS */
866 static inline void free_cgroup_ns(struct cgroup_namespace *ns) { }
867 static inline struct cgroup_namespace *
868 copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns,
869 struct cgroup_namespace *old_ns)
874 #endif /* !CONFIG_CGROUPS */
876 static inline void get_cgroup_ns(struct cgroup_namespace *ns)
879 refcount_inc(&ns->ns.count);
882 static inline void put_cgroup_ns(struct cgroup_namespace *ns)
884 if (ns && refcount_dec_and_test(&ns->ns.count))
888 #ifdef CONFIG_CGROUPS
890 void cgroup_enter_frozen(void);
891 void cgroup_leave_frozen(bool always_leave);
892 void cgroup_update_frozen(struct cgroup *cgrp);
893 void cgroup_freeze(struct cgroup *cgrp, bool freeze);
894 void cgroup_freezer_migrate_task(struct task_struct *task, struct cgroup *src,
897 static inline bool cgroup_task_frozen(struct task_struct *task)
902 #else /* !CONFIG_CGROUPS */
904 static inline void cgroup_enter_frozen(void) { }
905 static inline void cgroup_leave_frozen(bool always_leave) { }
906 static inline bool cgroup_task_frozen(struct task_struct *task)
911 #endif /* !CONFIG_CGROUPS */
913 #ifdef CONFIG_CGROUP_BPF
914 static inline void cgroup_bpf_get(struct cgroup *cgrp)
916 percpu_ref_get(&cgrp->bpf.refcnt);
919 static inline void cgroup_bpf_put(struct cgroup *cgrp)
921 percpu_ref_put(&cgrp->bpf.refcnt);
924 #else /* CONFIG_CGROUP_BPF */
926 static inline void cgroup_bpf_get(struct cgroup *cgrp) {}
927 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
929 #endif /* CONFIG_CGROUP_BPF */
931 #endif /* _LINUX_CGROUP_H */