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 hierarhcy 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);
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);
119 int task_cgroup_path(struct task_struct *task, char *buf, size_t buflen);
120 int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry);
121 int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
122 struct pid *pid, struct task_struct *tsk);
124 void cgroup_fork(struct task_struct *p);
125 extern int cgroup_can_fork(struct task_struct *p,
126 struct kernel_clone_args *kargs);
127 extern void cgroup_cancel_fork(struct task_struct *p,
128 struct kernel_clone_args *kargs);
129 extern void cgroup_post_fork(struct task_struct *p,
130 struct kernel_clone_args *kargs);
131 void cgroup_exit(struct task_struct *p);
132 void cgroup_release(struct task_struct *p);
133 void cgroup_free(struct task_struct *p);
135 int cgroup_init_early(void);
136 int cgroup_init(void);
138 int cgroup_parse_float(const char *input, unsigned dec_shift, s64 *v);
141 * Iteration helpers and macros.
144 struct cgroup_subsys_state *css_next_child(struct cgroup_subsys_state *pos,
145 struct cgroup_subsys_state *parent);
146 struct cgroup_subsys_state *css_next_descendant_pre(struct cgroup_subsys_state *pos,
147 struct cgroup_subsys_state *css);
148 struct cgroup_subsys_state *css_rightmost_descendant(struct cgroup_subsys_state *pos);
149 struct cgroup_subsys_state *css_next_descendant_post(struct cgroup_subsys_state *pos,
150 struct cgroup_subsys_state *css);
152 struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset,
153 struct cgroup_subsys_state **dst_cssp);
154 struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset,
155 struct cgroup_subsys_state **dst_cssp);
157 void css_task_iter_start(struct cgroup_subsys_state *css, unsigned int flags,
158 struct css_task_iter *it);
159 struct task_struct *css_task_iter_next(struct css_task_iter *it);
160 void css_task_iter_end(struct css_task_iter *it);
163 * css_for_each_child - iterate through children of a css
164 * @pos: the css * to use as the loop cursor
165 * @parent: css whose children to walk
167 * Walk @parent's children. Must be called under rcu_read_lock().
169 * If a subsystem synchronizes ->css_online() and the start of iteration, a
170 * css which finished ->css_online() is guaranteed to be visible in the
171 * future iterations and will stay visible until the last reference is put.
172 * A css which hasn't finished ->css_online() or already finished
173 * ->css_offline() may show up during traversal. It's each subsystem's
174 * responsibility to synchronize against on/offlining.
176 * It is allowed to temporarily drop RCU read lock during iteration. The
177 * caller is responsible for ensuring that @pos remains accessible until
178 * the start of the next iteration by, for example, bumping the css refcnt.
180 #define css_for_each_child(pos, parent) \
181 for ((pos) = css_next_child(NULL, (parent)); (pos); \
182 (pos) = css_next_child((pos), (parent)))
185 * css_for_each_descendant_pre - pre-order walk of a css's descendants
186 * @pos: the css * to use as the loop cursor
187 * @root: css whose descendants to walk
189 * Walk @root's descendants. @root is included in the iteration and the
190 * first node to be visited. Must be called under rcu_read_lock().
192 * If a subsystem synchronizes ->css_online() and the start of iteration, a
193 * css which finished ->css_online() is guaranteed to be visible in the
194 * future iterations and will stay visible until the last reference is put.
195 * A css which hasn't finished ->css_online() or already finished
196 * ->css_offline() may show up during traversal. It's each subsystem's
197 * responsibility to synchronize against on/offlining.
199 * For example, the following guarantees that a descendant can't escape
200 * state updates of its ancestors.
204 * Lock @css's parent and @css;
205 * Inherit state from the parent;
209 * my_update_state(@css)
211 * css_for_each_descendant_pre(@pos, @css) {
214 * Update @css's state;
216 * Verify @pos is alive and inherit state from its parent;
221 * As long as the inheriting step, including checking the parent state, is
222 * enclosed inside @pos locking, double-locking the parent isn't necessary
223 * while inheriting. The state update to the parent is guaranteed to be
224 * visible by walking order and, as long as inheriting operations to the
225 * same @pos are atomic to each other, multiple updates racing each other
226 * still result in the correct state. It's guaranateed that at least one
227 * inheritance happens for any css after the latest update to its parent.
229 * If checking parent's state requires locking the parent, each inheriting
230 * iteration should lock and unlock both @pos->parent and @pos.
232 * Alternatively, a subsystem may choose to use a single global lock to
233 * synchronize ->css_online() and ->css_offline() against tree-walking
236 * It is allowed to temporarily drop RCU read lock during iteration. The
237 * caller is responsible for ensuring that @pos remains accessible until
238 * the start of the next iteration by, for example, bumping the css refcnt.
240 #define css_for_each_descendant_pre(pos, css) \
241 for ((pos) = css_next_descendant_pre(NULL, (css)); (pos); \
242 (pos) = css_next_descendant_pre((pos), (css)))
245 * css_for_each_descendant_post - post-order walk of a css's descendants
246 * @pos: the css * to use as the loop cursor
247 * @css: css whose descendants to walk
249 * Similar to css_for_each_descendant_pre() but performs post-order
250 * traversal instead. @root is included in the iteration and the last
251 * node to be visited.
253 * If a subsystem synchronizes ->css_online() and the start of iteration, a
254 * css which finished ->css_online() is guaranteed to be visible in the
255 * future iterations and will stay visible until the last reference is put.
256 * A css which hasn't finished ->css_online() or already finished
257 * ->css_offline() may show up during traversal. It's each subsystem's
258 * responsibility to synchronize against on/offlining.
260 * Note that the walk visibility guarantee example described in pre-order
261 * walk doesn't apply the same to post-order walks.
263 #define css_for_each_descendant_post(pos, css) \
264 for ((pos) = css_next_descendant_post(NULL, (css)); (pos); \
265 (pos) = css_next_descendant_post((pos), (css)))
268 * cgroup_taskset_for_each - iterate cgroup_taskset
269 * @task: the loop cursor
270 * @dst_css: the destination css
271 * @tset: taskset to iterate
273 * @tset may contain multiple tasks and they may belong to multiple
276 * On the v2 hierarchy, there may be tasks from multiple processes and they
277 * may not share the source or destination csses.
279 * On traditional hierarchies, when there are multiple tasks in @tset, if a
280 * task of a process is in @tset, all tasks of the process are in @tset.
281 * Also, all are guaranteed to share the same source and destination csses.
283 * Iteration is not in any specific order.
285 #define cgroup_taskset_for_each(task, dst_css, tset) \
286 for ((task) = cgroup_taskset_first((tset), &(dst_css)); \
288 (task) = cgroup_taskset_next((tset), &(dst_css)))
291 * cgroup_taskset_for_each_leader - iterate group leaders in a cgroup_taskset
292 * @leader: the loop cursor
293 * @dst_css: the destination css
294 * @tset: taskset to iterate
296 * Iterate threadgroup leaders of @tset. For single-task migrations, @tset
297 * may not contain any.
299 #define cgroup_taskset_for_each_leader(leader, dst_css, tset) \
300 for ((leader) = cgroup_taskset_first((tset), &(dst_css)); \
302 (leader) = cgroup_taskset_next((tset), &(dst_css))) \
303 if ((leader) != (leader)->group_leader) \
311 static inline u64 cgroup_id(struct cgroup *cgrp)
317 * css_get - obtain a reference on the specified css
320 * The caller must already have a reference.
322 static inline void css_get(struct cgroup_subsys_state *css)
324 if (!(css->flags & CSS_NO_REF))
325 percpu_ref_get(&css->refcnt);
329 * css_get_many - obtain references on the specified css
331 * @n: number of references to get
333 * The caller must already have a reference.
335 static inline void css_get_many(struct cgroup_subsys_state *css, unsigned int n)
337 if (!(css->flags & CSS_NO_REF))
338 percpu_ref_get_many(&css->refcnt, n);
342 * css_tryget - try to obtain a reference on the specified css
345 * Obtain a reference on @css unless it already has reached zero and is
346 * being released. This function doesn't care whether @css is on or
347 * offline. The caller naturally needs to ensure that @css is accessible
348 * but doesn't have to be holding a reference on it - IOW, RCU protected
349 * access is good enough for this function. Returns %true if a reference
350 * count was successfully obtained; %false otherwise.
352 static inline bool css_tryget(struct cgroup_subsys_state *css)
354 if (!(css->flags & CSS_NO_REF))
355 return percpu_ref_tryget(&css->refcnt);
360 * css_tryget_online - try to obtain a reference on the specified css if online
363 * Obtain a reference on @css if it's online. The caller naturally needs
364 * to ensure that @css is accessible but doesn't have to be holding a
365 * reference on it - IOW, RCU protected access is good enough for this
366 * function. Returns %true if a reference count was successfully obtained;
369 static inline bool css_tryget_online(struct cgroup_subsys_state *css)
371 if (!(css->flags & CSS_NO_REF))
372 return percpu_ref_tryget_live(&css->refcnt);
377 * css_is_dying - test whether the specified css is dying
380 * Test whether @css is in the process of offlining or already offline. In
381 * most cases, ->css_online() and ->css_offline() callbacks should be
382 * enough; however, the actual offline operations are RCU delayed and this
383 * test returns %true also when @css is scheduled to be offlined.
385 * This is useful, for example, when the use case requires synchronous
386 * behavior with respect to cgroup removal. cgroup removal schedules css
387 * offlining but the css can seem alive while the operation is being
388 * delayed. If the delay affects user visible semantics, this test can be
389 * used to resolve the situation.
391 static inline bool css_is_dying(struct cgroup_subsys_state *css)
393 return !(css->flags & CSS_NO_REF) && percpu_ref_is_dying(&css->refcnt);
397 * css_put - put a css reference
400 * Put a reference obtained via css_get() and css_tryget_online().
402 static inline void css_put(struct cgroup_subsys_state *css)
404 if (!(css->flags & CSS_NO_REF))
405 percpu_ref_put(&css->refcnt);
409 * css_put_many - put css references
411 * @n: number of references to put
413 * Put references obtained via css_get() and css_tryget_online().
415 static inline void css_put_many(struct cgroup_subsys_state *css, unsigned int n)
417 if (!(css->flags & CSS_NO_REF))
418 percpu_ref_put_many(&css->refcnt, n);
421 static inline void cgroup_get(struct cgroup *cgrp)
423 css_get(&cgrp->self);
426 static inline bool cgroup_tryget(struct cgroup *cgrp)
428 return css_tryget(&cgrp->self);
431 static inline void cgroup_put(struct cgroup *cgrp)
433 css_put(&cgrp->self);
437 * task_css_set_check - obtain a task's css_set with extra access conditions
438 * @task: the task to obtain css_set for
439 * @__c: extra condition expression to be passed to rcu_dereference_check()
441 * A task's css_set is RCU protected, initialized and exited while holding
442 * task_lock(), and can only be modified while holding both cgroup_mutex
443 * and task_lock() while the task is alive. This macro verifies that the
444 * caller is inside proper critical section and returns @task's css_set.
446 * The caller can also specify additional allowed conditions via @__c, such
447 * as locks used during the cgroup_subsys::attach() methods.
449 #ifdef CONFIG_PROVE_RCU
450 extern struct mutex cgroup_mutex;
451 extern spinlock_t css_set_lock;
452 #define task_css_set_check(task, __c) \
453 rcu_dereference_check((task)->cgroups, \
454 rcu_read_lock_sched_held() || \
455 lockdep_is_held(&cgroup_mutex) || \
456 lockdep_is_held(&css_set_lock) || \
457 ((task)->flags & PF_EXITING) || (__c))
459 #define task_css_set_check(task, __c) \
460 rcu_dereference((task)->cgroups)
464 * task_css_check - obtain css for (task, subsys) w/ extra access conds
465 * @task: the target task
466 * @subsys_id: the target subsystem ID
467 * @__c: extra condition expression to be passed to rcu_dereference_check()
469 * Return the cgroup_subsys_state for the (@task, @subsys_id) pair. The
470 * synchronization rules are the same as task_css_set_check().
472 #define task_css_check(task, subsys_id, __c) \
473 task_css_set_check((task), (__c))->subsys[(subsys_id)]
476 * task_css_set - obtain a task's css_set
477 * @task: the task to obtain css_set for
479 * See task_css_set_check().
481 static inline struct css_set *task_css_set(struct task_struct *task)
483 return task_css_set_check(task, false);
487 * task_css - obtain css for (task, subsys)
488 * @task: the target task
489 * @subsys_id: the target subsystem ID
491 * See task_css_check().
493 static inline struct cgroup_subsys_state *task_css(struct task_struct *task,
496 return task_css_check(task, subsys_id, false);
500 * task_get_css - find and get the css for (task, subsys)
501 * @task: the target task
502 * @subsys_id: the target subsystem ID
504 * Find the css for the (@task, @subsys_id) combination, increment a
505 * reference on and return it. This function is guaranteed to return a
506 * valid css. The returned css may already have been offlined.
508 static inline struct cgroup_subsys_state *
509 task_get_css(struct task_struct *task, int subsys_id)
511 struct cgroup_subsys_state *css;
515 css = task_css(task, subsys_id);
517 * Can't use css_tryget_online() here. A task which has
518 * PF_EXITING set may stay associated with an offline css.
519 * If such task calls this function, css_tryget_online()
522 if (likely(css_tryget(css)))
531 * task_css_is_root - test whether a task belongs to the root css
532 * @task: the target task
533 * @subsys_id: the target subsystem ID
535 * Test whether @task belongs to the root css on the specified subsystem.
536 * May be invoked in any context.
538 static inline bool task_css_is_root(struct task_struct *task, int subsys_id)
540 return task_css_check(task, subsys_id, true) ==
541 init_css_set.subsys[subsys_id];
544 static inline struct cgroup *task_cgroup(struct task_struct *task,
547 return task_css(task, subsys_id)->cgroup;
550 static inline struct cgroup *task_dfl_cgroup(struct task_struct *task)
552 return task_css_set(task)->dfl_cgrp;
555 static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)
557 struct cgroup_subsys_state *parent_css = cgrp->self.parent;
560 return container_of(parent_css, struct cgroup, self);
565 * cgroup_is_descendant - test ancestry
566 * @cgrp: the cgroup to be tested
567 * @ancestor: possible ancestor of @cgrp
569 * Test whether @cgrp is a descendant of @ancestor. It also returns %true
570 * if @cgrp == @ancestor. This function is safe to call as long as @cgrp
571 * and @ancestor are accessible.
573 static inline bool cgroup_is_descendant(struct cgroup *cgrp,
574 struct cgroup *ancestor)
576 if (cgrp->root != ancestor->root || cgrp->level < ancestor->level)
578 return cgrp->ancestor_ids[ancestor->level] == cgroup_id(ancestor);
582 * cgroup_ancestor - find ancestor of cgroup
583 * @cgrp: cgroup to find ancestor of
584 * @ancestor_level: level of ancestor to find starting from root
586 * Find ancestor of cgroup at specified level starting from root if it exists
587 * and return pointer to it. Return NULL if @cgrp doesn't have ancestor at
590 * This function is safe to call as long as @cgrp is accessible.
592 static inline struct cgroup *cgroup_ancestor(struct cgroup *cgrp,
595 if (cgrp->level < ancestor_level)
597 while (cgrp && cgrp->level > ancestor_level)
598 cgrp = cgroup_parent(cgrp);
603 * task_under_cgroup_hierarchy - test task's membership of cgroup ancestry
604 * @task: the task to be tested
605 * @ancestor: possible ancestor of @task's cgroup
607 * Tests whether @task's default cgroup hierarchy is a descendant of @ancestor.
608 * It follows all the same rules as cgroup_is_descendant, and only applies
609 * to the default hierarchy.
611 static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
612 struct cgroup *ancestor)
614 struct css_set *cset = task_css_set(task);
616 return cgroup_is_descendant(cset->dfl_cgrp, ancestor);
619 /* no synchronization, the result can only be used as a hint */
620 static inline bool cgroup_is_populated(struct cgroup *cgrp)
622 return cgrp->nr_populated_csets + cgrp->nr_populated_domain_children +
623 cgrp->nr_populated_threaded_children;
626 /* returns ino associated with a cgroup */
627 static inline ino_t cgroup_ino(struct cgroup *cgrp)
629 return kernfs_ino(cgrp->kn);
632 /* cft/css accessors for cftype->write() operation */
633 static inline struct cftype *of_cft(struct kernfs_open_file *of)
638 struct cgroup_subsys_state *of_css(struct kernfs_open_file *of);
640 /* cft/css accessors for cftype->seq_*() operations */
641 static inline struct cftype *seq_cft(struct seq_file *seq)
643 return of_cft(seq->private);
646 static inline struct cgroup_subsys_state *seq_css(struct seq_file *seq)
648 return of_css(seq->private);
652 * Name / path handling functions. All are thin wrappers around the kernfs
653 * counterparts and can be called under any context.
656 static inline int cgroup_name(struct cgroup *cgrp, char *buf, size_t buflen)
658 return kernfs_name(cgrp->kn, buf, buflen);
661 static inline int cgroup_path(struct cgroup *cgrp, char *buf, size_t buflen)
663 return kernfs_path(cgrp->kn, buf, buflen);
666 static inline void pr_cont_cgroup_name(struct cgroup *cgrp)
668 pr_cont_kernfs_name(cgrp->kn);
671 static inline void pr_cont_cgroup_path(struct cgroup *cgrp)
673 pr_cont_kernfs_path(cgrp->kn);
676 static inline struct psi_group *cgroup_psi(struct cgroup *cgrp)
681 static inline void cgroup_init_kthreadd(void)
684 * kthreadd is inherited by all kthreads, keep it in the root so
685 * that the new kthreads are guaranteed to stay in the root until
686 * initialization is finished.
688 current->no_cgroup_migration = 1;
691 static inline void cgroup_kthread_ready(void)
694 * This kthread finished initialization. The creator should have
695 * set PF_NO_SETAFFINITY if this kthread should stay in the root.
697 current->no_cgroup_migration = 0;
700 void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen);
701 #else /* !CONFIG_CGROUPS */
703 struct cgroup_subsys_state;
706 static inline u64 cgroup_id(struct cgroup *cgrp) { return 1; }
707 static inline void css_get(struct cgroup_subsys_state *css) {}
708 static inline void css_put(struct cgroup_subsys_state *css) {}
709 static inline int cgroup_attach_task_all(struct task_struct *from,
710 struct task_struct *t) { return 0; }
711 static inline int cgroupstats_build(struct cgroupstats *stats,
712 struct dentry *dentry) { return -EINVAL; }
714 static inline void cgroup_fork(struct task_struct *p) {}
715 static inline int cgroup_can_fork(struct task_struct *p,
716 struct kernel_clone_args *kargs) { return 0; }
717 static inline void cgroup_cancel_fork(struct task_struct *p,
718 struct kernel_clone_args *kargs) {}
719 static inline void cgroup_post_fork(struct task_struct *p,
720 struct kernel_clone_args *kargs) {}
721 static inline void cgroup_exit(struct task_struct *p) {}
722 static inline void cgroup_release(struct task_struct *p) {}
723 static inline void cgroup_free(struct task_struct *p) {}
725 static inline int cgroup_init_early(void) { return 0; }
726 static inline int cgroup_init(void) { return 0; }
727 static inline void cgroup_init_kthreadd(void) {}
728 static inline void cgroup_kthread_ready(void) {}
730 static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)
735 static inline struct psi_group *cgroup_psi(struct cgroup *cgrp)
740 static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
741 struct cgroup *ancestor)
746 static inline void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen)
748 #endif /* !CONFIG_CGROUPS */
750 #ifdef CONFIG_CGROUPS
752 * cgroup scalable recursive statistics.
754 void cgroup_rstat_updated(struct cgroup *cgrp, int cpu);
755 void cgroup_rstat_flush(struct cgroup *cgrp);
756 void cgroup_rstat_flush_irqsafe(struct cgroup *cgrp);
757 void cgroup_rstat_flush_hold(struct cgroup *cgrp);
758 void cgroup_rstat_flush_release(void);
761 * Basic resource stats.
763 #ifdef CONFIG_CGROUP_CPUACCT
764 void cpuacct_charge(struct task_struct *tsk, u64 cputime);
765 void cpuacct_account_field(struct task_struct *tsk, int index, u64 val);
767 static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {}
768 static inline void cpuacct_account_field(struct task_struct *tsk, int index,
772 void __cgroup_account_cputime(struct cgroup *cgrp, u64 delta_exec);
773 void __cgroup_account_cputime_field(struct cgroup *cgrp,
774 enum cpu_usage_stat index, u64 delta_exec);
776 static inline void cgroup_account_cputime(struct task_struct *task,
781 cpuacct_charge(task, delta_exec);
783 cgrp = task_dfl_cgroup(task);
784 if (cgroup_parent(cgrp))
785 __cgroup_account_cputime(cgrp, delta_exec);
788 static inline void cgroup_account_cputime_field(struct task_struct *task,
789 enum cpu_usage_stat index,
794 cpuacct_account_field(task, index, delta_exec);
797 cgrp = task_dfl_cgroup(task);
798 if (cgroup_parent(cgrp))
799 __cgroup_account_cputime_field(cgrp, index, delta_exec);
803 #else /* CONFIG_CGROUPS */
805 static inline void cgroup_account_cputime(struct task_struct *task,
807 static inline void cgroup_account_cputime_field(struct task_struct *task,
808 enum cpu_usage_stat index,
811 #endif /* CONFIG_CGROUPS */
814 * sock->sk_cgrp_data handling. For more info, see sock_cgroup_data
815 * definition in cgroup-defs.h.
817 #ifdef CONFIG_SOCK_CGROUP_DATA
819 #if defined(CONFIG_CGROUP_NET_PRIO) || defined(CONFIG_CGROUP_NET_CLASSID)
820 extern spinlock_t cgroup_sk_update_lock;
823 void cgroup_sk_alloc_disable(void);
824 void cgroup_sk_alloc(struct sock_cgroup_data *skcd);
825 void cgroup_sk_clone(struct sock_cgroup_data *skcd);
826 void cgroup_sk_free(struct sock_cgroup_data *skcd);
828 static inline struct cgroup *sock_cgroup_ptr(struct sock_cgroup_data *skcd)
830 #if defined(CONFIG_CGROUP_NET_PRIO) || defined(CONFIG_CGROUP_NET_CLASSID)
834 * @skcd->val is 64bit but the following is safe on 32bit too as we
835 * just need the lower ulong to be written and read atomically.
837 v = READ_ONCE(skcd->val);
840 return &cgrp_dfl_root.cgrp;
842 return (struct cgroup *)(unsigned long)v ?: &cgrp_dfl_root.cgrp;
844 return (struct cgroup *)(unsigned long)skcd->val;
848 #else /* CONFIG_CGROUP_DATA */
850 static inline void cgroup_sk_alloc(struct sock_cgroup_data *skcd) {}
851 static inline void cgroup_sk_clone(struct sock_cgroup_data *skcd) {}
852 static inline void cgroup_sk_free(struct sock_cgroup_data *skcd) {}
854 #endif /* CONFIG_CGROUP_DATA */
856 struct cgroup_namespace {
859 struct user_namespace *user_ns;
860 struct ucounts *ucounts;
861 struct css_set *root_cset;
864 extern struct cgroup_namespace init_cgroup_ns;
866 #ifdef CONFIG_CGROUPS
868 void free_cgroup_ns(struct cgroup_namespace *ns);
870 struct cgroup_namespace *copy_cgroup_ns(unsigned long flags,
871 struct user_namespace *user_ns,
872 struct cgroup_namespace *old_ns);
874 int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,
875 struct cgroup_namespace *ns);
877 #else /* !CONFIG_CGROUPS */
879 static inline void free_cgroup_ns(struct cgroup_namespace *ns) { }
880 static inline struct cgroup_namespace *
881 copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns,
882 struct cgroup_namespace *old_ns)
887 #endif /* !CONFIG_CGROUPS */
889 static inline void get_cgroup_ns(struct cgroup_namespace *ns)
892 refcount_inc(&ns->count);
895 static inline void put_cgroup_ns(struct cgroup_namespace *ns)
897 if (ns && refcount_dec_and_test(&ns->count))
901 #ifdef CONFIG_CGROUPS
903 void cgroup_enter_frozen(void);
904 void cgroup_leave_frozen(bool always_leave);
905 void cgroup_update_frozen(struct cgroup *cgrp);
906 void cgroup_freeze(struct cgroup *cgrp, bool freeze);
907 void cgroup_freezer_migrate_task(struct task_struct *task, struct cgroup *src,
910 static inline bool cgroup_task_freeze(struct task_struct *task)
914 if (task->flags & PF_KTHREAD)
918 ret = test_bit(CGRP_FREEZE, &task_dfl_cgroup(task)->flags);
924 static inline bool cgroup_task_frozen(struct task_struct *task)
929 #else /* !CONFIG_CGROUPS */
931 static inline void cgroup_enter_frozen(void) { }
932 static inline void cgroup_leave_frozen(bool always_leave) { }
933 static inline bool cgroup_task_freeze(struct task_struct *task)
937 static inline bool cgroup_task_frozen(struct task_struct *task)
942 #endif /* !CONFIG_CGROUPS */
944 #ifdef CONFIG_CGROUP_BPF
945 static inline void cgroup_bpf_get(struct cgroup *cgrp)
947 percpu_ref_get(&cgrp->bpf.refcnt);
950 static inline void cgroup_bpf_put(struct cgroup *cgrp)
952 percpu_ref_put(&cgrp->bpf.refcnt);
955 #else /* CONFIG_CGROUP_BPF */
957 static inline void cgroup_bpf_get(struct cgroup *cgrp) {}
958 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
960 #endif /* CONFIG_CGROUP_BPF */
962 #endif /* _LINUX_CGROUP_H */