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 file_system_type cgroup_fs_type;
72 extern struct cgroup_root cgrp_dfl_root;
73 extern struct css_set init_css_set;
75 #define SUBSYS(_x) extern struct cgroup_subsys _x ## _cgrp_subsys;
76 #include <linux/cgroup_subsys.h>
80 extern struct static_key_true _x ## _cgrp_subsys_enabled_key; \
81 extern struct static_key_true _x ## _cgrp_subsys_on_dfl_key;
82 #include <linux/cgroup_subsys.h>
86 * cgroup_subsys_enabled - fast test on whether a subsys is enabled
87 * @ss: subsystem in question
89 #define cgroup_subsys_enabled(ss) \
90 static_branch_likely(&ss ## _enabled_key)
93 * cgroup_subsys_on_dfl - fast test on whether a subsys is on default hierarchy
94 * @ss: subsystem in question
96 #define cgroup_subsys_on_dfl(ss) \
97 static_branch_likely(&ss ## _on_dfl_key)
99 bool css_has_online_children(struct cgroup_subsys_state *css);
100 struct cgroup_subsys_state *css_from_id(int id, struct cgroup_subsys *ss);
101 struct cgroup_subsys_state *cgroup_e_css(struct cgroup *cgroup,
102 struct cgroup_subsys *ss);
103 struct cgroup_subsys_state *cgroup_get_e_css(struct cgroup *cgroup,
104 struct cgroup_subsys *ss);
105 struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry,
106 struct cgroup_subsys *ss);
108 struct cgroup *cgroup_get_from_path(const char *path);
109 struct cgroup *cgroup_get_from_fd(int fd);
110 struct cgroup *cgroup_v1v2_get_from_fd(int fd);
112 int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
113 int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);
115 int cgroup_add_dfl_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
116 int cgroup_add_legacy_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
117 int cgroup_rm_cftypes(struct cftype *cfts);
118 void cgroup_file_notify(struct cgroup_file *cfile);
119 void cgroup_file_show(struct cgroup_file *cfile, bool show);
121 int task_cgroup_path(struct task_struct *task, char *buf, size_t buflen);
122 int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry);
123 int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
124 struct pid *pid, struct task_struct *tsk);
126 void cgroup_fork(struct task_struct *p);
127 extern int cgroup_can_fork(struct task_struct *p,
128 struct kernel_clone_args *kargs);
129 extern void cgroup_cancel_fork(struct task_struct *p,
130 struct kernel_clone_args *kargs);
131 extern void cgroup_post_fork(struct task_struct *p,
132 struct kernel_clone_args *kargs);
133 void cgroup_exit(struct task_struct *p);
134 void cgroup_release(struct task_struct *p);
135 void cgroup_free(struct task_struct *p);
137 int cgroup_init_early(void);
138 int cgroup_init(void);
140 int cgroup_parse_float(const char *input, unsigned dec_shift, s64 *v);
143 * Iteration helpers and macros.
146 struct cgroup_subsys_state *css_next_child(struct cgroup_subsys_state *pos,
147 struct cgroup_subsys_state *parent);
148 struct cgroup_subsys_state *css_next_descendant_pre(struct cgroup_subsys_state *pos,
149 struct cgroup_subsys_state *css);
150 struct cgroup_subsys_state *css_rightmost_descendant(struct cgroup_subsys_state *pos);
151 struct cgroup_subsys_state *css_next_descendant_post(struct cgroup_subsys_state *pos,
152 struct cgroup_subsys_state *css);
154 struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset,
155 struct cgroup_subsys_state **dst_cssp);
156 struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset,
157 struct cgroup_subsys_state **dst_cssp);
159 void css_task_iter_start(struct cgroup_subsys_state *css, unsigned int flags,
160 struct css_task_iter *it);
161 struct task_struct *css_task_iter_next(struct css_task_iter *it);
162 void css_task_iter_end(struct css_task_iter *it);
165 * css_for_each_child - iterate through children of a css
166 * @pos: the css * to use as the loop cursor
167 * @parent: css whose children to walk
169 * Walk @parent's children. Must be called under rcu_read_lock().
171 * If a subsystem synchronizes ->css_online() and the start of iteration, a
172 * css which finished ->css_online() is guaranteed to be visible in the
173 * future iterations and will stay visible until the last reference is put.
174 * A css which hasn't finished ->css_online() or already finished
175 * ->css_offline() may show up during traversal. It's each subsystem's
176 * responsibility to synchronize against on/offlining.
178 * It is allowed to temporarily drop RCU read lock during iteration. The
179 * caller is responsible for ensuring that @pos remains accessible until
180 * the start of the next iteration by, for example, bumping the css refcnt.
182 #define css_for_each_child(pos, parent) \
183 for ((pos) = css_next_child(NULL, (parent)); (pos); \
184 (pos) = css_next_child((pos), (parent)))
187 * css_for_each_descendant_pre - pre-order walk of a css's descendants
188 * @pos: the css * to use as the loop cursor
189 * @root: css whose descendants to walk
191 * Walk @root's descendants. @root is included in the iteration and the
192 * first node to be visited. Must be called under rcu_read_lock().
194 * If a subsystem synchronizes ->css_online() and the start of iteration, a
195 * css which finished ->css_online() is guaranteed to be visible in the
196 * future iterations and will stay visible until the last reference is put.
197 * A css which hasn't finished ->css_online() or already finished
198 * ->css_offline() may show up during traversal. It's each subsystem's
199 * responsibility to synchronize against on/offlining.
201 * For example, the following guarantees that a descendant can't escape
202 * state updates of its ancestors.
206 * Lock @css's parent and @css;
207 * Inherit state from the parent;
211 * my_update_state(@css)
213 * css_for_each_descendant_pre(@pos, @css) {
216 * Update @css's state;
218 * Verify @pos is alive and inherit state from its parent;
223 * As long as the inheriting step, including checking the parent state, is
224 * enclosed inside @pos locking, double-locking the parent isn't necessary
225 * while inheriting. The state update to the parent is guaranteed to be
226 * visible by walking order and, as long as inheriting operations to the
227 * same @pos are atomic to each other, multiple updates racing each other
228 * still result in the correct state. It's guaranateed that at least one
229 * inheritance happens for any css after the latest update to its parent.
231 * If checking parent's state requires locking the parent, each inheriting
232 * iteration should lock and unlock both @pos->parent and @pos.
234 * Alternatively, a subsystem may choose to use a single global lock to
235 * synchronize ->css_online() and ->css_offline() against tree-walking
238 * It is allowed to temporarily drop RCU read lock during iteration. The
239 * caller is responsible for ensuring that @pos remains accessible until
240 * the start of the next iteration by, for example, bumping the css refcnt.
242 #define css_for_each_descendant_pre(pos, css) \
243 for ((pos) = css_next_descendant_pre(NULL, (css)); (pos); \
244 (pos) = css_next_descendant_pre((pos), (css)))
247 * css_for_each_descendant_post - post-order walk of a css's descendants
248 * @pos: the css * to use as the loop cursor
249 * @css: css whose descendants to walk
251 * Similar to css_for_each_descendant_pre() but performs post-order
252 * traversal instead. @root is included in the iteration and the last
253 * node to be visited.
255 * If a subsystem synchronizes ->css_online() and the start of iteration, a
256 * css which finished ->css_online() is guaranteed to be visible in the
257 * future iterations and will stay visible until the last reference is put.
258 * A css which hasn't finished ->css_online() or already finished
259 * ->css_offline() may show up during traversal. It's each subsystem's
260 * responsibility to synchronize against on/offlining.
262 * Note that the walk visibility guarantee example described in pre-order
263 * walk doesn't apply the same to post-order walks.
265 #define css_for_each_descendant_post(pos, css) \
266 for ((pos) = css_next_descendant_post(NULL, (css)); (pos); \
267 (pos) = css_next_descendant_post((pos), (css)))
270 * cgroup_taskset_for_each - iterate cgroup_taskset
271 * @task: the loop cursor
272 * @dst_css: the destination css
273 * @tset: taskset to iterate
275 * @tset may contain multiple tasks and they may belong to multiple
278 * On the v2 hierarchy, there may be tasks from multiple processes and they
279 * may not share the source or destination csses.
281 * On traditional hierarchies, when there are multiple tasks in @tset, if a
282 * task of a process is in @tset, all tasks of the process are in @tset.
283 * Also, all are guaranteed to share the same source and destination csses.
285 * Iteration is not in any specific order.
287 #define cgroup_taskset_for_each(task, dst_css, tset) \
288 for ((task) = cgroup_taskset_first((tset), &(dst_css)); \
290 (task) = cgroup_taskset_next((tset), &(dst_css)))
293 * cgroup_taskset_for_each_leader - iterate group leaders in a cgroup_taskset
294 * @leader: the loop cursor
295 * @dst_css: the destination css
296 * @tset: taskset to iterate
298 * Iterate threadgroup leaders of @tset. For single-task migrations, @tset
299 * may not contain any.
301 #define cgroup_taskset_for_each_leader(leader, dst_css, tset) \
302 for ((leader) = cgroup_taskset_first((tset), &(dst_css)); \
304 (leader) = cgroup_taskset_next((tset), &(dst_css))) \
305 if ((leader) != (leader)->group_leader) \
313 static inline u64 cgroup_id(const struct cgroup *cgrp)
319 * css_get - obtain a reference on the specified css
322 * The caller must already have a reference.
324 static inline void css_get(struct cgroup_subsys_state *css)
326 if (!(css->flags & CSS_NO_REF))
327 percpu_ref_get(&css->refcnt);
331 * css_get_many - obtain references on the specified css
333 * @n: number of references to get
335 * The caller must already have a reference.
337 static inline void css_get_many(struct cgroup_subsys_state *css, unsigned int n)
339 if (!(css->flags & CSS_NO_REF))
340 percpu_ref_get_many(&css->refcnt, n);
344 * css_tryget - try to obtain a reference on the specified css
347 * Obtain a reference on @css unless it already has reached zero and is
348 * being released. This function doesn't care whether @css is on or
349 * offline. The caller naturally needs to ensure that @css is accessible
350 * but doesn't have to be holding a reference on it - IOW, RCU protected
351 * access is good enough for this function. Returns %true if a reference
352 * count was successfully obtained; %false otherwise.
354 static inline bool css_tryget(struct cgroup_subsys_state *css)
356 if (!(css->flags & CSS_NO_REF))
357 return percpu_ref_tryget(&css->refcnt);
362 * css_tryget_online - try to obtain a reference on the specified css if online
365 * Obtain a reference on @css if it's online. The caller naturally needs
366 * to ensure that @css is accessible but doesn't have to be holding a
367 * reference on it - IOW, RCU protected access is good enough for this
368 * function. Returns %true if a reference count was successfully obtained;
371 static inline bool css_tryget_online(struct cgroup_subsys_state *css)
373 if (!(css->flags & CSS_NO_REF))
374 return percpu_ref_tryget_live(&css->refcnt);
379 * css_is_dying - test whether the specified css is dying
382 * Test whether @css is in the process of offlining or already offline. In
383 * most cases, ->css_online() and ->css_offline() callbacks should be
384 * enough; however, the actual offline operations are RCU delayed and this
385 * test returns %true also when @css is scheduled to be offlined.
387 * This is useful, for example, when the use case requires synchronous
388 * behavior with respect to cgroup removal. cgroup removal schedules css
389 * offlining but the css can seem alive while the operation is being
390 * delayed. If the delay affects user visible semantics, this test can be
391 * used to resolve the situation.
393 static inline bool css_is_dying(struct cgroup_subsys_state *css)
395 return !(css->flags & CSS_NO_REF) && percpu_ref_is_dying(&css->refcnt);
399 * css_put - put a css reference
402 * Put a reference obtained via css_get() and css_tryget_online().
404 static inline void css_put(struct cgroup_subsys_state *css)
406 if (!(css->flags & CSS_NO_REF))
407 percpu_ref_put(&css->refcnt);
411 * css_put_many - put css references
413 * @n: number of references to put
415 * Put references obtained via css_get() and css_tryget_online().
417 static inline void css_put_many(struct cgroup_subsys_state *css, unsigned int n)
419 if (!(css->flags & CSS_NO_REF))
420 percpu_ref_put_many(&css->refcnt, n);
423 static inline void cgroup_get(struct cgroup *cgrp)
425 css_get(&cgrp->self);
428 static inline bool cgroup_tryget(struct cgroup *cgrp)
430 return css_tryget(&cgrp->self);
433 static inline void cgroup_put(struct cgroup *cgrp)
435 css_put(&cgrp->self);
438 extern struct mutex cgroup_mutex;
440 static inline void cgroup_lock(void)
442 mutex_lock(&cgroup_mutex);
445 static inline void cgroup_unlock(void)
447 mutex_unlock(&cgroup_mutex);
451 * task_css_set_check - obtain a task's css_set with extra access conditions
452 * @task: the task to obtain css_set for
453 * @__c: extra condition expression to be passed to rcu_dereference_check()
455 * A task's css_set is RCU protected, initialized and exited while holding
456 * task_lock(), and can only be modified while holding both cgroup_mutex
457 * and task_lock() while the task is alive. This macro verifies that the
458 * caller is inside proper critical section and returns @task's css_set.
460 * The caller can also specify additional allowed conditions via @__c, such
461 * as locks used during the cgroup_subsys::attach() methods.
463 #ifdef CONFIG_PROVE_RCU
464 extern spinlock_t css_set_lock;
465 #define task_css_set_check(task, __c) \
466 rcu_dereference_check((task)->cgroups, \
467 rcu_read_lock_sched_held() || \
468 lockdep_is_held(&cgroup_mutex) || \
469 lockdep_is_held(&css_set_lock) || \
470 ((task)->flags & PF_EXITING) || (__c))
472 #define task_css_set_check(task, __c) \
473 rcu_dereference((task)->cgroups)
477 * task_css_check - obtain css for (task, subsys) w/ extra access conds
478 * @task: the target task
479 * @subsys_id: the target subsystem ID
480 * @__c: extra condition expression to be passed to rcu_dereference_check()
482 * Return the cgroup_subsys_state for the (@task, @subsys_id) pair. The
483 * synchronization rules are the same as task_css_set_check().
485 #define task_css_check(task, subsys_id, __c) \
486 task_css_set_check((task), (__c))->subsys[(subsys_id)]
489 * task_css_set - obtain a task's css_set
490 * @task: the task to obtain css_set for
492 * See task_css_set_check().
494 static inline struct css_set *task_css_set(struct task_struct *task)
496 return task_css_set_check(task, false);
500 * task_css - obtain css for (task, subsys)
501 * @task: the target task
502 * @subsys_id: the target subsystem ID
504 * See task_css_check().
506 static inline struct cgroup_subsys_state *task_css(struct task_struct *task,
509 return task_css_check(task, subsys_id, false);
513 * task_get_css - find and get the css for (task, subsys)
514 * @task: the target task
515 * @subsys_id: the target subsystem ID
517 * Find the css for the (@task, @subsys_id) combination, increment a
518 * reference on and return it. This function is guaranteed to return a
519 * valid css. The returned css may already have been offlined.
521 static inline struct cgroup_subsys_state *
522 task_get_css(struct task_struct *task, int subsys_id)
524 struct cgroup_subsys_state *css;
528 css = task_css(task, subsys_id);
530 * Can't use css_tryget_online() here. A task which has
531 * PF_EXITING set may stay associated with an offline css.
532 * If such task calls this function, css_tryget_online()
535 if (likely(css_tryget(css)))
544 * task_css_is_root - test whether a task belongs to the root css
545 * @task: the target task
546 * @subsys_id: the target subsystem ID
548 * Test whether @task belongs to the root css on the specified subsystem.
549 * May be invoked in any context.
551 static inline bool task_css_is_root(struct task_struct *task, int subsys_id)
553 return task_css_check(task, subsys_id, true) ==
554 init_css_set.subsys[subsys_id];
557 static inline struct cgroup *task_cgroup(struct task_struct *task,
560 return task_css(task, subsys_id)->cgroup;
563 static inline struct cgroup *task_dfl_cgroup(struct task_struct *task)
565 return task_css_set(task)->dfl_cgrp;
568 static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)
570 struct cgroup_subsys_state *parent_css = cgrp->self.parent;
573 return container_of(parent_css, struct cgroup, self);
578 * cgroup_is_descendant - test ancestry
579 * @cgrp: the cgroup to be tested
580 * @ancestor: possible ancestor of @cgrp
582 * Test whether @cgrp is a descendant of @ancestor. It also returns %true
583 * if @cgrp == @ancestor. This function is safe to call as long as @cgrp
584 * and @ancestor are accessible.
586 static inline bool cgroup_is_descendant(struct cgroup *cgrp,
587 struct cgroup *ancestor)
589 if (cgrp->root != ancestor->root || cgrp->level < ancestor->level)
591 return cgrp->ancestors[ancestor->level] == ancestor;
595 * cgroup_ancestor - find ancestor of cgroup
596 * @cgrp: cgroup to find ancestor of
597 * @ancestor_level: level of ancestor to find starting from root
599 * Find ancestor of cgroup at specified level starting from root if it exists
600 * and return pointer to it. Return NULL if @cgrp doesn't have ancestor at
603 * This function is safe to call as long as @cgrp is accessible.
605 static inline struct cgroup *cgroup_ancestor(struct cgroup *cgrp,
608 if (ancestor_level < 0 || ancestor_level > cgrp->level)
610 return cgrp->ancestors[ancestor_level];
614 * task_under_cgroup_hierarchy - test task's membership of cgroup ancestry
615 * @task: the task to be tested
616 * @ancestor: possible ancestor of @task's cgroup
618 * Tests whether @task's default cgroup hierarchy is a descendant of @ancestor.
619 * It follows all the same rules as cgroup_is_descendant, and only applies
620 * to the default hierarchy.
622 static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
623 struct cgroup *ancestor)
625 struct css_set *cset = task_css_set(task);
627 return cgroup_is_descendant(cset->dfl_cgrp, ancestor);
630 /* no synchronization, the result can only be used as a hint */
631 static inline bool cgroup_is_populated(struct cgroup *cgrp)
633 return cgrp->nr_populated_csets + cgrp->nr_populated_domain_children +
634 cgrp->nr_populated_threaded_children;
637 /* returns ino associated with a cgroup */
638 static inline ino_t cgroup_ino(struct cgroup *cgrp)
640 return kernfs_ino(cgrp->kn);
643 /* cft/css accessors for cftype->write() operation */
644 static inline struct cftype *of_cft(struct kernfs_open_file *of)
649 struct cgroup_subsys_state *of_css(struct kernfs_open_file *of);
651 /* cft/css accessors for cftype->seq_*() operations */
652 static inline struct cftype *seq_cft(struct seq_file *seq)
654 return of_cft(seq->private);
657 static inline struct cgroup_subsys_state *seq_css(struct seq_file *seq)
659 return of_css(seq->private);
663 * Name / path handling functions. All are thin wrappers around the kernfs
664 * counterparts and can be called under any context.
667 static inline int cgroup_name(struct cgroup *cgrp, char *buf, size_t buflen)
669 return kernfs_name(cgrp->kn, buf, buflen);
672 static inline int cgroup_path(struct cgroup *cgrp, char *buf, size_t buflen)
674 return kernfs_path(cgrp->kn, buf, buflen);
677 static inline void pr_cont_cgroup_name(struct cgroup *cgrp)
679 pr_cont_kernfs_name(cgrp->kn);
682 static inline void pr_cont_cgroup_path(struct cgroup *cgrp)
684 pr_cont_kernfs_path(cgrp->kn);
687 bool cgroup_psi_enabled(void);
689 static inline void cgroup_init_kthreadd(void)
692 * kthreadd is inherited by all kthreads, keep it in the root so
693 * that the new kthreads are guaranteed to stay in the root until
694 * initialization is finished.
696 current->no_cgroup_migration = 1;
699 static inline void cgroup_kthread_ready(void)
702 * This kthread finished initialization. The creator should have
703 * set PF_NO_SETAFFINITY if this kthread should stay in the root.
705 current->no_cgroup_migration = 0;
708 void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen);
709 struct cgroup *cgroup_get_from_id(u64 id);
710 #else /* !CONFIG_CGROUPS */
712 struct cgroup_subsys_state;
715 static inline u64 cgroup_id(const struct cgroup *cgrp) { return 1; }
716 static inline void css_get(struct cgroup_subsys_state *css) {}
717 static inline void css_put(struct cgroup_subsys_state *css) {}
718 static inline void cgroup_lock(void) {}
719 static inline void cgroup_unlock(void) {}
720 static inline int cgroup_attach_task_all(struct task_struct *from,
721 struct task_struct *t) { return 0; }
722 static inline int cgroupstats_build(struct cgroupstats *stats,
723 struct dentry *dentry) { return -EINVAL; }
725 static inline void cgroup_fork(struct task_struct *p) {}
726 static inline int cgroup_can_fork(struct task_struct *p,
727 struct kernel_clone_args *kargs) { return 0; }
728 static inline void cgroup_cancel_fork(struct task_struct *p,
729 struct kernel_clone_args *kargs) {}
730 static inline void cgroup_post_fork(struct task_struct *p,
731 struct kernel_clone_args *kargs) {}
732 static inline void cgroup_exit(struct task_struct *p) {}
733 static inline void cgroup_release(struct task_struct *p) {}
734 static inline void cgroup_free(struct task_struct *p) {}
736 static inline int cgroup_init_early(void) { return 0; }
737 static inline int cgroup_init(void) { return 0; }
738 static inline void cgroup_init_kthreadd(void) {}
739 static inline void cgroup_kthread_ready(void) {}
741 static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)
746 static inline bool cgroup_psi_enabled(void)
751 static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
752 struct cgroup *ancestor)
757 static inline void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen)
759 #endif /* !CONFIG_CGROUPS */
761 #ifdef CONFIG_CGROUPS
763 * cgroup scalable recursive statistics.
765 void cgroup_rstat_updated(struct cgroup *cgrp, int cpu);
766 void cgroup_rstat_flush(struct cgroup *cgrp);
767 void cgroup_rstat_flush_irqsafe(struct cgroup *cgrp);
768 void cgroup_rstat_flush_hold(struct cgroup *cgrp);
769 void cgroup_rstat_flush_release(void);
772 * Basic resource stats.
774 #ifdef CONFIG_CGROUP_CPUACCT
775 void cpuacct_charge(struct task_struct *tsk, u64 cputime);
776 void cpuacct_account_field(struct task_struct *tsk, int index, u64 val);
778 static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {}
779 static inline void cpuacct_account_field(struct task_struct *tsk, int index,
783 void __cgroup_account_cputime(struct cgroup *cgrp, u64 delta_exec);
784 void __cgroup_account_cputime_field(struct cgroup *cgrp,
785 enum cpu_usage_stat index, u64 delta_exec);
787 static inline void cgroup_account_cputime(struct task_struct *task,
792 cpuacct_charge(task, delta_exec);
794 cgrp = task_dfl_cgroup(task);
795 if (cgroup_parent(cgrp))
796 __cgroup_account_cputime(cgrp, delta_exec);
799 static inline void cgroup_account_cputime_field(struct task_struct *task,
800 enum cpu_usage_stat index,
805 cpuacct_account_field(task, index, delta_exec);
807 cgrp = task_dfl_cgroup(task);
808 if (cgroup_parent(cgrp))
809 __cgroup_account_cputime_field(cgrp, index, delta_exec);
812 #else /* CONFIG_CGROUPS */
814 static inline void cgroup_account_cputime(struct task_struct *task,
816 static inline void cgroup_account_cputime_field(struct task_struct *task,
817 enum cpu_usage_stat index,
820 #endif /* CONFIG_CGROUPS */
823 * sock->sk_cgrp_data handling. For more info, see sock_cgroup_data
824 * definition in cgroup-defs.h.
826 #ifdef CONFIG_SOCK_CGROUP_DATA
828 void cgroup_sk_alloc(struct sock_cgroup_data *skcd);
829 void cgroup_sk_clone(struct sock_cgroup_data *skcd);
830 void cgroup_sk_free(struct sock_cgroup_data *skcd);
832 static inline struct cgroup *sock_cgroup_ptr(struct sock_cgroup_data *skcd)
837 #else /* CONFIG_CGROUP_DATA */
839 static inline void cgroup_sk_alloc(struct sock_cgroup_data *skcd) {}
840 static inline void cgroup_sk_clone(struct sock_cgroup_data *skcd) {}
841 static inline void cgroup_sk_free(struct sock_cgroup_data *skcd) {}
843 #endif /* CONFIG_CGROUP_DATA */
845 struct cgroup_namespace {
847 struct user_namespace *user_ns;
848 struct ucounts *ucounts;
849 struct css_set *root_cset;
852 extern struct cgroup_namespace init_cgroup_ns;
854 #ifdef CONFIG_CGROUPS
856 void free_cgroup_ns(struct cgroup_namespace *ns);
858 struct cgroup_namespace *copy_cgroup_ns(unsigned long flags,
859 struct user_namespace *user_ns,
860 struct cgroup_namespace *old_ns);
862 int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,
863 struct cgroup_namespace *ns);
865 #else /* !CONFIG_CGROUPS */
867 static inline void free_cgroup_ns(struct cgroup_namespace *ns) { }
868 static inline struct cgroup_namespace *
869 copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns,
870 struct cgroup_namespace *old_ns)
875 #endif /* !CONFIG_CGROUPS */
877 static inline void get_cgroup_ns(struct cgroup_namespace *ns)
880 refcount_inc(&ns->ns.count);
883 static inline void put_cgroup_ns(struct cgroup_namespace *ns)
885 if (ns && refcount_dec_and_test(&ns->ns.count))
889 #ifdef CONFIG_CGROUPS
891 void cgroup_enter_frozen(void);
892 void cgroup_leave_frozen(bool always_leave);
893 void cgroup_update_frozen(struct cgroup *cgrp);
894 void cgroup_freeze(struct cgroup *cgrp, bool freeze);
895 void cgroup_freezer_migrate_task(struct task_struct *task, struct cgroup *src,
898 static inline bool cgroup_task_frozen(struct task_struct *task)
903 #else /* !CONFIG_CGROUPS */
905 static inline void cgroup_enter_frozen(void) { }
906 static inline void cgroup_leave_frozen(bool always_leave) { }
907 static inline bool cgroup_task_frozen(struct task_struct *task)
912 #endif /* !CONFIG_CGROUPS */
914 #ifdef CONFIG_CGROUP_BPF
915 static inline void cgroup_bpf_get(struct cgroup *cgrp)
917 percpu_ref_get(&cgrp->bpf.refcnt);
920 static inline void cgroup_bpf_put(struct cgroup *cgrp)
922 percpu_ref_put(&cgrp->bpf.refcnt);
925 #else /* CONFIG_CGROUP_BPF */
927 static inline void cgroup_bpf_get(struct cgroup *cgrp) {}
928 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
930 #endif /* CONFIG_CGROUP_BPF */
932 #endif /* _LINUX_CGROUP_H */