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)
47 #define CSS_TASK_ITER_SKIPPED (1U << 16)
49 /* a css_task_iter should be treated as an opaque object */
50 struct css_task_iter {
51 struct cgroup_subsys *ss;
54 struct list_head *cset_pos;
55 struct list_head *cset_head;
57 struct list_head *tcset_pos;
58 struct list_head *tcset_head;
60 struct list_head *task_pos;
61 struct list_head *tasks_head;
62 struct list_head *mg_tasks_head;
63 struct list_head *dying_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);
110 int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
111 int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);
113 int cgroup_add_dfl_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
114 int cgroup_add_legacy_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
115 int cgroup_rm_cftypes(struct cftype *cfts);
116 void cgroup_file_notify(struct cgroup_file *cfile);
118 int task_cgroup_path(struct task_struct *task, char *buf, size_t buflen);
119 int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry);
120 int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
121 struct pid *pid, struct task_struct *tsk);
123 void cgroup_fork(struct task_struct *p);
124 extern int cgroup_can_fork(struct task_struct *p);
125 extern void cgroup_cancel_fork(struct task_struct *p);
126 extern void cgroup_post_fork(struct task_struct *p);
127 void cgroup_exit(struct task_struct *p);
128 void cgroup_release(struct task_struct *p);
129 void cgroup_free(struct task_struct *p);
131 int cgroup_init_early(void);
132 int cgroup_init(void);
134 int cgroup_parse_float(const char *input, unsigned dec_shift, s64 *v);
137 * Iteration helpers and macros.
140 struct cgroup_subsys_state *css_next_child(struct cgroup_subsys_state *pos,
141 struct cgroup_subsys_state *parent);
142 struct cgroup_subsys_state *css_next_descendant_pre(struct cgroup_subsys_state *pos,
143 struct cgroup_subsys_state *css);
144 struct cgroup_subsys_state *css_rightmost_descendant(struct cgroup_subsys_state *pos);
145 struct cgroup_subsys_state *css_next_descendant_post(struct cgroup_subsys_state *pos,
146 struct cgroup_subsys_state *css);
148 struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset,
149 struct cgroup_subsys_state **dst_cssp);
150 struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset,
151 struct cgroup_subsys_state **dst_cssp);
153 void css_task_iter_start(struct cgroup_subsys_state *css, unsigned int flags,
154 struct css_task_iter *it);
155 struct task_struct *css_task_iter_next(struct css_task_iter *it);
156 void css_task_iter_end(struct css_task_iter *it);
159 * css_for_each_child - iterate through children of a css
160 * @pos: the css * to use as the loop cursor
161 * @parent: css whose children to walk
163 * Walk @parent's children. Must be called under rcu_read_lock().
165 * If a subsystem synchronizes ->css_online() and the start of iteration, a
166 * css which finished ->css_online() is guaranteed to be visible in the
167 * future iterations and will stay visible until the last reference is put.
168 * A css which hasn't finished ->css_online() or already finished
169 * ->css_offline() may show up during traversal. It's each subsystem's
170 * responsibility to synchronize against on/offlining.
172 * It is allowed to temporarily drop RCU read lock during iteration. The
173 * caller is responsible for ensuring that @pos remains accessible until
174 * the start of the next iteration by, for example, bumping the css refcnt.
176 #define css_for_each_child(pos, parent) \
177 for ((pos) = css_next_child(NULL, (parent)); (pos); \
178 (pos) = css_next_child((pos), (parent)))
181 * css_for_each_descendant_pre - pre-order walk of a css's descendants
182 * @pos: the css * to use as the loop cursor
183 * @root: css whose descendants to walk
185 * Walk @root's descendants. @root is included in the iteration and the
186 * first node to be visited. Must be called under rcu_read_lock().
188 * If a subsystem synchronizes ->css_online() and the start of iteration, a
189 * css which finished ->css_online() is guaranteed to be visible in the
190 * future iterations and will stay visible until the last reference is put.
191 * A css which hasn't finished ->css_online() or already finished
192 * ->css_offline() may show up during traversal. It's each subsystem's
193 * responsibility to synchronize against on/offlining.
195 * For example, the following guarantees that a descendant can't escape
196 * state updates of its ancestors.
200 * Lock @css's parent and @css;
201 * Inherit state from the parent;
205 * my_update_state(@css)
207 * css_for_each_descendant_pre(@pos, @css) {
210 * Update @css's state;
212 * Verify @pos is alive and inherit state from its parent;
217 * As long as the inheriting step, including checking the parent state, is
218 * enclosed inside @pos locking, double-locking the parent isn't necessary
219 * while inheriting. The state update to the parent is guaranteed to be
220 * visible by walking order and, as long as inheriting operations to the
221 * same @pos are atomic to each other, multiple updates racing each other
222 * still result in the correct state. It's guaranateed that at least one
223 * inheritance happens for any css after the latest update to its parent.
225 * If checking parent's state requires locking the parent, each inheriting
226 * iteration should lock and unlock both @pos->parent and @pos.
228 * Alternatively, a subsystem may choose to use a single global lock to
229 * synchronize ->css_online() and ->css_offline() against tree-walking
232 * It is allowed to temporarily drop RCU read lock during iteration. The
233 * caller is responsible for ensuring that @pos remains accessible until
234 * the start of the next iteration by, for example, bumping the css refcnt.
236 #define css_for_each_descendant_pre(pos, css) \
237 for ((pos) = css_next_descendant_pre(NULL, (css)); (pos); \
238 (pos) = css_next_descendant_pre((pos), (css)))
241 * css_for_each_descendant_post - post-order walk of a css's descendants
242 * @pos: the css * to use as the loop cursor
243 * @css: css whose descendants to walk
245 * Similar to css_for_each_descendant_pre() but performs post-order
246 * traversal instead. @root is included in the iteration and the last
247 * node to be visited.
249 * If a subsystem synchronizes ->css_online() and the start of iteration, a
250 * css which finished ->css_online() is guaranteed to be visible in the
251 * future iterations and will stay visible until the last reference is put.
252 * A css which hasn't finished ->css_online() or already finished
253 * ->css_offline() may show up during traversal. It's each subsystem's
254 * responsibility to synchronize against on/offlining.
256 * Note that the walk visibility guarantee example described in pre-order
257 * walk doesn't apply the same to post-order walks.
259 #define css_for_each_descendant_post(pos, css) \
260 for ((pos) = css_next_descendant_post(NULL, (css)); (pos); \
261 (pos) = css_next_descendant_post((pos), (css)))
264 * cgroup_taskset_for_each - iterate cgroup_taskset
265 * @task: the loop cursor
266 * @dst_css: the destination css
267 * @tset: taskset to iterate
269 * @tset may contain multiple tasks and they may belong to multiple
272 * On the v2 hierarchy, there may be tasks from multiple processes and they
273 * may not share the source or destination csses.
275 * On traditional hierarchies, when there are multiple tasks in @tset, if a
276 * task of a process is in @tset, all tasks of the process are in @tset.
277 * Also, all are guaranteed to share the same source and destination csses.
279 * Iteration is not in any specific order.
281 #define cgroup_taskset_for_each(task, dst_css, tset) \
282 for ((task) = cgroup_taskset_first((tset), &(dst_css)); \
284 (task) = cgroup_taskset_next((tset), &(dst_css)))
287 * cgroup_taskset_for_each_leader - iterate group leaders in a cgroup_taskset
288 * @leader: the loop cursor
289 * @dst_css: the destination css
290 * @tset: taskset to iterate
292 * Iterate threadgroup leaders of @tset. For single-task migrations, @tset
293 * may not contain any.
295 #define cgroup_taskset_for_each_leader(leader, dst_css, tset) \
296 for ((leader) = cgroup_taskset_first((tset), &(dst_css)); \
298 (leader) = cgroup_taskset_next((tset), &(dst_css))) \
299 if ((leader) != (leader)->group_leader) \
308 * css_get - obtain a reference on the specified css
311 * The caller must already have a reference.
313 static inline void css_get(struct cgroup_subsys_state *css)
315 if (!(css->flags & CSS_NO_REF))
316 percpu_ref_get(&css->refcnt);
320 * css_get_many - obtain references on the specified css
322 * @n: number of references to get
324 * The caller must already have a reference.
326 static inline void css_get_many(struct cgroup_subsys_state *css, unsigned int n)
328 if (!(css->flags & CSS_NO_REF))
329 percpu_ref_get_many(&css->refcnt, n);
333 * css_tryget - try to obtain a reference on the specified css
336 * Obtain a reference on @css unless it already has reached zero and is
337 * being released. This function doesn't care whether @css is on or
338 * offline. The caller naturally needs to ensure that @css is accessible
339 * but doesn't have to be holding a reference on it - IOW, RCU protected
340 * access is good enough for this function. Returns %true if a reference
341 * count was successfully obtained; %false otherwise.
343 static inline bool css_tryget(struct cgroup_subsys_state *css)
345 if (!(css->flags & CSS_NO_REF))
346 return percpu_ref_tryget(&css->refcnt);
351 * css_tryget_online - try to obtain a reference on the specified css if online
354 * Obtain a reference on @css if it's online. The caller naturally needs
355 * to ensure that @css is accessible but doesn't have to be holding a
356 * reference on it - IOW, RCU protected access is good enough for this
357 * function. Returns %true if a reference count was successfully obtained;
360 static inline bool css_tryget_online(struct cgroup_subsys_state *css)
362 if (!(css->flags & CSS_NO_REF))
363 return percpu_ref_tryget_live(&css->refcnt);
368 * css_is_dying - test whether the specified css is dying
371 * Test whether @css is in the process of offlining or already offline. In
372 * most cases, ->css_online() and ->css_offline() callbacks should be
373 * enough; however, the actual offline operations are RCU delayed and this
374 * test returns %true also when @css is scheduled to be offlined.
376 * This is useful, for example, when the use case requires synchronous
377 * behavior with respect to cgroup removal. cgroup removal schedules css
378 * offlining but the css can seem alive while the operation is being
379 * delayed. If the delay affects user visible semantics, this test can be
380 * used to resolve the situation.
382 static inline bool css_is_dying(struct cgroup_subsys_state *css)
384 return !(css->flags & CSS_NO_REF) && percpu_ref_is_dying(&css->refcnt);
388 * css_put - put a css reference
391 * Put a reference obtained via css_get() and css_tryget_online().
393 static inline void css_put(struct cgroup_subsys_state *css)
395 if (!(css->flags & CSS_NO_REF))
396 percpu_ref_put(&css->refcnt);
400 * css_put_many - put css references
402 * @n: number of references to put
404 * Put references obtained via css_get() and css_tryget_online().
406 static inline void css_put_many(struct cgroup_subsys_state *css, unsigned int n)
408 if (!(css->flags & CSS_NO_REF))
409 percpu_ref_put_many(&css->refcnt, n);
412 static inline void cgroup_get(struct cgroup *cgrp)
414 css_get(&cgrp->self);
417 static inline bool cgroup_tryget(struct cgroup *cgrp)
419 return css_tryget(&cgrp->self);
422 static inline void cgroup_put(struct cgroup *cgrp)
424 css_put(&cgrp->self);
428 * task_css_set_check - obtain a task's css_set with extra access conditions
429 * @task: the task to obtain css_set for
430 * @__c: extra condition expression to be passed to rcu_dereference_check()
432 * A task's css_set is RCU protected, initialized and exited while holding
433 * task_lock(), and can only be modified while holding both cgroup_mutex
434 * and task_lock() while the task is alive. This macro verifies that the
435 * caller is inside proper critical section and returns @task's css_set.
437 * The caller can also specify additional allowed conditions via @__c, such
438 * as locks used during the cgroup_subsys::attach() methods.
440 #ifdef CONFIG_PROVE_RCU
441 extern struct mutex cgroup_mutex;
442 extern spinlock_t css_set_lock;
443 #define task_css_set_check(task, __c) \
444 rcu_dereference_check((task)->cgroups, \
445 lockdep_is_held(&cgroup_mutex) || \
446 lockdep_is_held(&css_set_lock) || \
447 ((task)->flags & PF_EXITING) || (__c))
449 #define task_css_set_check(task, __c) \
450 rcu_dereference((task)->cgroups)
454 * task_css_check - obtain css for (task, subsys) w/ extra access conds
455 * @task: the target task
456 * @subsys_id: the target subsystem ID
457 * @__c: extra condition expression to be passed to rcu_dereference_check()
459 * Return the cgroup_subsys_state for the (@task, @subsys_id) pair. The
460 * synchronization rules are the same as task_css_set_check().
462 #define task_css_check(task, subsys_id, __c) \
463 task_css_set_check((task), (__c))->subsys[(subsys_id)]
466 * task_css_set - obtain a task's css_set
467 * @task: the task to obtain css_set for
469 * See task_css_set_check().
471 static inline struct css_set *task_css_set(struct task_struct *task)
473 return task_css_set_check(task, false);
477 * task_css - obtain css for (task, subsys)
478 * @task: the target task
479 * @subsys_id: the target subsystem ID
481 * See task_css_check().
483 static inline struct cgroup_subsys_state *task_css(struct task_struct *task,
486 return task_css_check(task, subsys_id, false);
490 * task_get_css - find and get the css for (task, subsys)
491 * @task: the target task
492 * @subsys_id: the target subsystem ID
494 * Find the css for the (@task, @subsys_id) combination, increment a
495 * reference on and return it. This function is guaranteed to return a
496 * valid css. The returned css may already have been offlined.
498 static inline struct cgroup_subsys_state *
499 task_get_css(struct task_struct *task, int subsys_id)
501 struct cgroup_subsys_state *css;
505 css = task_css(task, subsys_id);
507 * Can't use css_tryget_online() here. A task which has
508 * PF_EXITING set may stay associated with an offline css.
509 * If such task calls this function, css_tryget_online()
512 if (likely(css_tryget(css)))
521 * task_css_is_root - test whether a task belongs to the root css
522 * @task: the target task
523 * @subsys_id: the target subsystem ID
525 * Test whether @task belongs to the root css on the specified subsystem.
526 * May be invoked in any context.
528 static inline bool task_css_is_root(struct task_struct *task, int subsys_id)
530 return task_css_check(task, subsys_id, true) ==
531 init_css_set.subsys[subsys_id];
534 static inline struct cgroup *task_cgroup(struct task_struct *task,
537 return task_css(task, subsys_id)->cgroup;
540 static inline struct cgroup *task_dfl_cgroup(struct task_struct *task)
542 return task_css_set(task)->dfl_cgrp;
545 static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)
547 struct cgroup_subsys_state *parent_css = cgrp->self.parent;
550 return container_of(parent_css, struct cgroup, self);
555 * cgroup_is_descendant - test ancestry
556 * @cgrp: the cgroup to be tested
557 * @ancestor: possible ancestor of @cgrp
559 * Test whether @cgrp is a descendant of @ancestor. It also returns %true
560 * if @cgrp == @ancestor. This function is safe to call as long as @cgrp
561 * and @ancestor are accessible.
563 static inline bool cgroup_is_descendant(struct cgroup *cgrp,
564 struct cgroup *ancestor)
566 if (cgrp->root != ancestor->root || cgrp->level < ancestor->level)
568 return cgrp->ancestor_ids[ancestor->level] == ancestor->id;
572 * cgroup_ancestor - find ancestor of cgroup
573 * @cgrp: cgroup to find ancestor of
574 * @ancestor_level: level of ancestor to find starting from root
576 * Find ancestor of cgroup at specified level starting from root if it exists
577 * and return pointer to it. Return NULL if @cgrp doesn't have ancestor at
580 * This function is safe to call as long as @cgrp is accessible.
582 static inline struct cgroup *cgroup_ancestor(struct cgroup *cgrp,
585 if (cgrp->level < ancestor_level)
587 while (cgrp && cgrp->level > ancestor_level)
588 cgrp = cgroup_parent(cgrp);
593 * task_under_cgroup_hierarchy - test task's membership of cgroup ancestry
594 * @task: the task to be tested
595 * @ancestor: possible ancestor of @task's cgroup
597 * Tests whether @task's default cgroup hierarchy is a descendant of @ancestor.
598 * It follows all the same rules as cgroup_is_descendant, and only applies
599 * to the default hierarchy.
601 static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
602 struct cgroup *ancestor)
604 struct css_set *cset = task_css_set(task);
606 return cgroup_is_descendant(cset->dfl_cgrp, ancestor);
609 /* no synchronization, the result can only be used as a hint */
610 static inline bool cgroup_is_populated(struct cgroup *cgrp)
612 return cgrp->nr_populated_csets + cgrp->nr_populated_domain_children +
613 cgrp->nr_populated_threaded_children;
616 /* returns ino associated with a cgroup */
617 static inline ino_t cgroup_ino(struct cgroup *cgrp)
619 return cgrp->kn->id.ino;
622 /* cft/css accessors for cftype->write() operation */
623 static inline struct cftype *of_cft(struct kernfs_open_file *of)
628 struct cgroup_subsys_state *of_css(struct kernfs_open_file *of);
630 /* cft/css accessors for cftype->seq_*() operations */
631 static inline struct cftype *seq_cft(struct seq_file *seq)
633 return of_cft(seq->private);
636 static inline struct cgroup_subsys_state *seq_css(struct seq_file *seq)
638 return of_css(seq->private);
642 * Name / path handling functions. All are thin wrappers around the kernfs
643 * counterparts and can be called under any context.
646 static inline int cgroup_name(struct cgroup *cgrp, char *buf, size_t buflen)
648 return kernfs_name(cgrp->kn, buf, buflen);
651 static inline int cgroup_path(struct cgroup *cgrp, char *buf, size_t buflen)
653 return kernfs_path(cgrp->kn, buf, buflen);
656 static inline void pr_cont_cgroup_name(struct cgroup *cgrp)
658 pr_cont_kernfs_name(cgrp->kn);
661 static inline void pr_cont_cgroup_path(struct cgroup *cgrp)
663 pr_cont_kernfs_path(cgrp->kn);
666 static inline struct psi_group *cgroup_psi(struct cgroup *cgrp)
671 static inline void cgroup_init_kthreadd(void)
674 * kthreadd is inherited by all kthreads, keep it in the root so
675 * that the new kthreads are guaranteed to stay in the root until
676 * initialization is finished.
678 current->no_cgroup_migration = 1;
681 static inline void cgroup_kthread_ready(void)
684 * This kthread finished initialization. The creator should have
685 * set PF_NO_SETAFFINITY if this kthread should stay in the root.
687 current->no_cgroup_migration = 0;
690 static inline union kernfs_node_id *cgroup_get_kernfs_id(struct cgroup *cgrp)
692 return &cgrp->kn->id;
695 void cgroup_path_from_kernfs_id(const union kernfs_node_id *id,
696 char *buf, size_t buflen);
697 #else /* !CONFIG_CGROUPS */
699 struct cgroup_subsys_state;
702 static inline void css_put(struct cgroup_subsys_state *css) {}
703 static inline int cgroup_attach_task_all(struct task_struct *from,
704 struct task_struct *t) { return 0; }
705 static inline int cgroupstats_build(struct cgroupstats *stats,
706 struct dentry *dentry) { return -EINVAL; }
708 static inline void cgroup_fork(struct task_struct *p) {}
709 static inline int cgroup_can_fork(struct task_struct *p) { return 0; }
710 static inline void cgroup_cancel_fork(struct task_struct *p) {}
711 static inline void cgroup_post_fork(struct task_struct *p) {}
712 static inline void cgroup_exit(struct task_struct *p) {}
713 static inline void cgroup_release(struct task_struct *p) {}
714 static inline void cgroup_free(struct task_struct *p) {}
716 static inline int cgroup_init_early(void) { return 0; }
717 static inline int cgroup_init(void) { return 0; }
718 static inline void cgroup_init_kthreadd(void) {}
719 static inline void cgroup_kthread_ready(void) {}
720 static inline union kernfs_node_id *cgroup_get_kernfs_id(struct cgroup *cgrp)
725 static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)
730 static inline struct psi_group *cgroup_psi(struct cgroup *cgrp)
735 static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
736 struct cgroup *ancestor)
741 static inline void cgroup_path_from_kernfs_id(const union kernfs_node_id *id,
742 char *buf, size_t buflen) {}
743 #endif /* !CONFIG_CGROUPS */
745 #ifdef CONFIG_CGROUPS
747 * cgroup scalable recursive statistics.
749 void cgroup_rstat_updated(struct cgroup *cgrp, int cpu);
750 void cgroup_rstat_flush(struct cgroup *cgrp);
751 void cgroup_rstat_flush_irqsafe(struct cgroup *cgrp);
752 void cgroup_rstat_flush_hold(struct cgroup *cgrp);
753 void cgroup_rstat_flush_release(void);
756 * Basic resource stats.
758 #ifdef CONFIG_CGROUP_CPUACCT
759 void cpuacct_charge(struct task_struct *tsk, u64 cputime);
760 void cpuacct_account_field(struct task_struct *tsk, int index, u64 val);
762 static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {}
763 static inline void cpuacct_account_field(struct task_struct *tsk, int index,
767 void __cgroup_account_cputime(struct cgroup *cgrp, u64 delta_exec);
768 void __cgroup_account_cputime_field(struct cgroup *cgrp,
769 enum cpu_usage_stat index, u64 delta_exec);
771 static inline void cgroup_account_cputime(struct task_struct *task,
776 cpuacct_charge(task, delta_exec);
779 cgrp = task_dfl_cgroup(task);
780 if (cgroup_parent(cgrp))
781 __cgroup_account_cputime(cgrp, delta_exec);
785 static inline void cgroup_account_cputime_field(struct task_struct *task,
786 enum cpu_usage_stat index,
791 cpuacct_account_field(task, index, delta_exec);
794 cgrp = task_dfl_cgroup(task);
795 if (cgroup_parent(cgrp))
796 __cgroup_account_cputime_field(cgrp, index, delta_exec);
800 #else /* CONFIG_CGROUPS */
802 static inline void cgroup_account_cputime(struct task_struct *task,
804 static inline void cgroup_account_cputime_field(struct task_struct *task,
805 enum cpu_usage_stat index,
808 #endif /* CONFIG_CGROUPS */
811 * sock->sk_cgrp_data handling. For more info, see sock_cgroup_data
812 * definition in cgroup-defs.h.
814 #ifdef CONFIG_SOCK_CGROUP_DATA
816 #if defined(CONFIG_CGROUP_NET_PRIO) || defined(CONFIG_CGROUP_NET_CLASSID)
817 extern spinlock_t cgroup_sk_update_lock;
820 void cgroup_sk_alloc_disable(void);
821 void cgroup_sk_alloc(struct sock_cgroup_data *skcd);
822 void cgroup_sk_free(struct sock_cgroup_data *skcd);
824 static inline struct cgroup *sock_cgroup_ptr(struct sock_cgroup_data *skcd)
826 #if defined(CONFIG_CGROUP_NET_PRIO) || defined(CONFIG_CGROUP_NET_CLASSID)
830 * @skcd->val is 64bit but the following is safe on 32bit too as we
831 * just need the lower ulong to be written and read atomically.
833 v = READ_ONCE(skcd->val);
836 return &cgrp_dfl_root.cgrp;
838 return (struct cgroup *)(unsigned long)v ?: &cgrp_dfl_root.cgrp;
840 return (struct cgroup *)(unsigned long)skcd->val;
844 #else /* CONFIG_CGROUP_DATA */
846 static inline void cgroup_sk_alloc(struct sock_cgroup_data *skcd) {}
847 static inline void cgroup_sk_free(struct sock_cgroup_data *skcd) {}
849 #endif /* CONFIG_CGROUP_DATA */
851 struct cgroup_namespace {
854 struct user_namespace *user_ns;
855 struct ucounts *ucounts;
856 struct css_set *root_cset;
859 extern struct cgroup_namespace init_cgroup_ns;
861 #ifdef CONFIG_CGROUPS
863 void free_cgroup_ns(struct cgroup_namespace *ns);
865 struct cgroup_namespace *copy_cgroup_ns(unsigned long flags,
866 struct user_namespace *user_ns,
867 struct cgroup_namespace *old_ns);
869 int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,
870 struct cgroup_namespace *ns);
872 #else /* !CONFIG_CGROUPS */
874 static inline void free_cgroup_ns(struct cgroup_namespace *ns) { }
875 static inline struct cgroup_namespace *
876 copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns,
877 struct cgroup_namespace *old_ns)
882 #endif /* !CONFIG_CGROUPS */
884 static inline void get_cgroup_ns(struct cgroup_namespace *ns)
887 refcount_inc(&ns->count);
890 static inline void put_cgroup_ns(struct cgroup_namespace *ns)
892 if (ns && refcount_dec_and_test(&ns->count))
896 #ifdef CONFIG_CGROUPS
898 void cgroup_enter_frozen(void);
899 void cgroup_leave_frozen(bool always_leave);
900 void cgroup_update_frozen(struct cgroup *cgrp);
901 void cgroup_freeze(struct cgroup *cgrp, bool freeze);
902 void cgroup_freezer_migrate_task(struct task_struct *task, struct cgroup *src,
905 static inline bool cgroup_task_freeze(struct task_struct *task)
909 if (task->flags & PF_KTHREAD)
913 ret = test_bit(CGRP_FREEZE, &task_dfl_cgroup(task)->flags);
919 static inline bool cgroup_task_frozen(struct task_struct *task)
924 #else /* !CONFIG_CGROUPS */
926 static inline void cgroup_enter_frozen(void) { }
927 static inline void cgroup_leave_frozen(bool always_leave) { }
928 static inline bool cgroup_task_freeze(struct task_struct *task)
932 static inline bool cgroup_task_frozen(struct task_struct *task)
937 #endif /* !CONFIG_CGROUPS */
939 #ifdef CONFIG_CGROUP_BPF
940 static inline void cgroup_bpf_get(struct cgroup *cgrp)
942 percpu_ref_get(&cgrp->bpf.refcnt);
945 static inline void cgroup_bpf_put(struct cgroup *cgrp)
947 percpu_ref_put(&cgrp->bpf.refcnt);
950 #else /* CONFIG_CGROUP_BPF */
952 static inline void cgroup_bpf_get(struct cgroup *cgrp) {}
953 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
955 #endif /* CONFIG_CGROUP_BPF */
957 #endif /* _LINUX_CGROUP_H */