1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_CGROUP_H
3 #define _LINUX_CGROUP_H
7 * Copyright (C) 2003 BULL SA
8 * Copyright (C) 2004-2006 Silicon Graphics, Inc.
12 #include <linux/sched.h>
13 #include <linux/cpumask.h>
14 #include <linux/nodemask.h>
15 #include <linux/rculist.h>
16 #include <linux/cgroupstats.h>
18 #include <linux/seq_file.h>
19 #include <linux/kernfs.h>
20 #include <linux/jump_label.h>
21 #include <linux/types.h>
22 #include <linux/ns_common.h>
23 #include <linux/nsproxy.h>
24 #include <linux/user_namespace.h>
25 #include <linux/refcount.h>
26 #include <linux/kernel_stat.h>
28 #include <linux/cgroup-defs.h>
33 * All weight knobs on the default hierarhcy should use the following min,
34 * default and max values. The default value is the logarithmic center of
35 * MIN and MAX and allows 100x to be expressed in both directions.
37 #define CGROUP_WEIGHT_MIN 1
38 #define CGROUP_WEIGHT_DFL 100
39 #define CGROUP_WEIGHT_MAX 10000
41 /* walk only threadgroup leaders */
42 #define CSS_TASK_ITER_PROCS (1U << 0)
43 /* walk all threaded css_sets in the domain */
44 #define CSS_TASK_ITER_THREADED (1U << 1)
46 /* a css_task_iter should be treated as an opaque object */
47 struct css_task_iter {
48 struct cgroup_subsys *ss;
51 struct list_head *cset_pos;
52 struct list_head *cset_head;
54 struct list_head *tcset_pos;
55 struct list_head *tcset_head;
57 struct list_head *task_pos;
58 struct list_head *tasks_head;
59 struct list_head *mg_tasks_head;
61 struct css_set *cur_cset;
62 struct css_set *cur_dcset;
63 struct task_struct *cur_task;
64 struct list_head iters_node; /* css_set->task_iters */
67 extern struct cgroup_root cgrp_dfl_root;
68 extern struct css_set init_css_set;
70 #define SUBSYS(_x) extern struct cgroup_subsys _x ## _cgrp_subsys;
71 #include <linux/cgroup_subsys.h>
75 extern struct static_key_true _x ## _cgrp_subsys_enabled_key; \
76 extern struct static_key_true _x ## _cgrp_subsys_on_dfl_key;
77 #include <linux/cgroup_subsys.h>
81 * cgroup_subsys_enabled - fast test on whether a subsys is enabled
82 * @ss: subsystem in question
84 #define cgroup_subsys_enabled(ss) \
85 static_branch_likely(&ss ## _enabled_key)
88 * cgroup_subsys_on_dfl - fast test on whether a subsys is on default hierarchy
89 * @ss: subsystem in question
91 #define cgroup_subsys_on_dfl(ss) \
92 static_branch_likely(&ss ## _on_dfl_key)
94 bool css_has_online_children(struct cgroup_subsys_state *css);
95 struct cgroup_subsys_state *css_from_id(int id, struct cgroup_subsys *ss);
96 struct cgroup_subsys_state *cgroup_e_css(struct cgroup *cgroup,
97 struct cgroup_subsys *ss);
98 struct cgroup_subsys_state *cgroup_get_e_css(struct cgroup *cgroup,
99 struct cgroup_subsys *ss);
100 struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry,
101 struct cgroup_subsys *ss);
103 struct cgroup *cgroup_get_from_path(const char *path);
104 struct cgroup *cgroup_get_from_fd(int fd);
106 int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
107 int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);
109 int cgroup_add_dfl_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
110 int cgroup_add_legacy_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
111 int cgroup_rm_cftypes(struct cftype *cfts);
112 void cgroup_file_notify(struct cgroup_file *cfile);
114 int task_cgroup_path(struct task_struct *task, char *buf, size_t buflen);
115 int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry);
116 int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
117 struct pid *pid, struct task_struct *tsk);
119 void cgroup_fork(struct task_struct *p);
120 extern int cgroup_can_fork(struct task_struct *p);
121 extern void cgroup_cancel_fork(struct task_struct *p);
122 extern void cgroup_post_fork(struct task_struct *p);
123 void cgroup_exit(struct task_struct *p);
124 void cgroup_release(struct task_struct *p);
125 void cgroup_free(struct task_struct *p);
127 int cgroup_init_early(void);
128 int cgroup_init(void);
131 * Iteration helpers and macros.
134 struct cgroup_subsys_state *css_next_child(struct cgroup_subsys_state *pos,
135 struct cgroup_subsys_state *parent);
136 struct cgroup_subsys_state *css_next_descendant_pre(struct cgroup_subsys_state *pos,
137 struct cgroup_subsys_state *css);
138 struct cgroup_subsys_state *css_rightmost_descendant(struct cgroup_subsys_state *pos);
139 struct cgroup_subsys_state *css_next_descendant_post(struct cgroup_subsys_state *pos,
140 struct cgroup_subsys_state *css);
142 struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset,
143 struct cgroup_subsys_state **dst_cssp);
144 struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset,
145 struct cgroup_subsys_state **dst_cssp);
147 void css_task_iter_start(struct cgroup_subsys_state *css, unsigned int flags,
148 struct css_task_iter *it);
149 struct task_struct *css_task_iter_next(struct css_task_iter *it);
150 void css_task_iter_end(struct css_task_iter *it);
153 * css_for_each_child - iterate through children of a css
154 * @pos: the css * to use as the loop cursor
155 * @parent: css whose children to walk
157 * Walk @parent's children. Must be called under rcu_read_lock().
159 * If a subsystem synchronizes ->css_online() and the start of iteration, a
160 * css which finished ->css_online() is guaranteed to be visible in the
161 * future iterations and will stay visible until the last reference is put.
162 * A css which hasn't finished ->css_online() or already finished
163 * ->css_offline() may show up during traversal. It's each subsystem's
164 * responsibility to synchronize against on/offlining.
166 * It is allowed to temporarily drop RCU read lock during iteration. The
167 * caller is responsible for ensuring that @pos remains accessible until
168 * the start of the next iteration by, for example, bumping the css refcnt.
170 #define css_for_each_child(pos, parent) \
171 for ((pos) = css_next_child(NULL, (parent)); (pos); \
172 (pos) = css_next_child((pos), (parent)))
175 * css_for_each_descendant_pre - pre-order walk of a css's descendants
176 * @pos: the css * to use as the loop cursor
177 * @root: css whose descendants to walk
179 * Walk @root's descendants. @root is included in the iteration and the
180 * first node to be visited. Must be called under rcu_read_lock().
182 * If a subsystem synchronizes ->css_online() and the start of iteration, a
183 * css which finished ->css_online() is guaranteed to be visible in the
184 * future iterations and will stay visible until the last reference is put.
185 * A css which hasn't finished ->css_online() or already finished
186 * ->css_offline() may show up during traversal. It's each subsystem's
187 * responsibility to synchronize against on/offlining.
189 * For example, the following guarantees that a descendant can't escape
190 * state updates of its ancestors.
194 * Lock @css's parent and @css;
195 * Inherit state from the parent;
199 * my_update_state(@css)
201 * css_for_each_descendant_pre(@pos, @css) {
204 * Update @css's state;
206 * Verify @pos is alive and inherit state from its parent;
211 * As long as the inheriting step, including checking the parent state, is
212 * enclosed inside @pos locking, double-locking the parent isn't necessary
213 * while inheriting. The state update to the parent is guaranteed to be
214 * visible by walking order and, as long as inheriting operations to the
215 * same @pos are atomic to each other, multiple updates racing each other
216 * still result in the correct state. It's guaranateed that at least one
217 * inheritance happens for any css after the latest update to its parent.
219 * If checking parent's state requires locking the parent, each inheriting
220 * iteration should lock and unlock both @pos->parent and @pos.
222 * Alternatively, a subsystem may choose to use a single global lock to
223 * synchronize ->css_online() and ->css_offline() against tree-walking
226 * It is allowed to temporarily drop RCU read lock during iteration. The
227 * caller is responsible for ensuring that @pos remains accessible until
228 * the start of the next iteration by, for example, bumping the css refcnt.
230 #define css_for_each_descendant_pre(pos, css) \
231 for ((pos) = css_next_descendant_pre(NULL, (css)); (pos); \
232 (pos) = css_next_descendant_pre((pos), (css)))
235 * css_for_each_descendant_post - post-order walk of a css's descendants
236 * @pos: the css * to use as the loop cursor
237 * @css: css whose descendants to walk
239 * Similar to css_for_each_descendant_pre() but performs post-order
240 * traversal instead. @root is included in the iteration and the last
241 * node to be visited.
243 * If a subsystem synchronizes ->css_online() and the start of iteration, a
244 * css which finished ->css_online() is guaranteed to be visible in the
245 * future iterations and will stay visible until the last reference is put.
246 * A css which hasn't finished ->css_online() or already finished
247 * ->css_offline() may show up during traversal. It's each subsystem's
248 * responsibility to synchronize against on/offlining.
250 * Note that the walk visibility guarantee example described in pre-order
251 * walk doesn't apply the same to post-order walks.
253 #define css_for_each_descendant_post(pos, css) \
254 for ((pos) = css_next_descendant_post(NULL, (css)); (pos); \
255 (pos) = css_next_descendant_post((pos), (css)))
258 * cgroup_taskset_for_each - iterate cgroup_taskset
259 * @task: the loop cursor
260 * @dst_css: the destination css
261 * @tset: taskset to iterate
263 * @tset may contain multiple tasks and they may belong to multiple
266 * On the v2 hierarchy, there may be tasks from multiple processes and they
267 * may not share the source or destination csses.
269 * On traditional hierarchies, when there are multiple tasks in @tset, if a
270 * task of a process is in @tset, all tasks of the process are in @tset.
271 * Also, all are guaranteed to share the same source and destination csses.
273 * Iteration is not in any specific order.
275 #define cgroup_taskset_for_each(task, dst_css, tset) \
276 for ((task) = cgroup_taskset_first((tset), &(dst_css)); \
278 (task) = cgroup_taskset_next((tset), &(dst_css)))
281 * cgroup_taskset_for_each_leader - iterate group leaders in a cgroup_taskset
282 * @leader: the loop cursor
283 * @dst_css: the destination css
284 * @tset: taskset to iterate
286 * Iterate threadgroup leaders of @tset. For single-task migrations, @tset
287 * may not contain any.
289 #define cgroup_taskset_for_each_leader(leader, dst_css, tset) \
290 for ((leader) = cgroup_taskset_first((tset), &(dst_css)); \
292 (leader) = cgroup_taskset_next((tset), &(dst_css))) \
293 if ((leader) != (leader)->group_leader) \
302 * css_get - obtain a reference on the specified css
305 * The caller must already have a reference.
307 static inline void css_get(struct cgroup_subsys_state *css)
309 if (!(css->flags & CSS_NO_REF))
310 percpu_ref_get(&css->refcnt);
314 * css_get_many - obtain references on the specified css
316 * @n: number of references to get
318 * The caller must already have a reference.
320 static inline void css_get_many(struct cgroup_subsys_state *css, unsigned int n)
322 if (!(css->flags & CSS_NO_REF))
323 percpu_ref_get_many(&css->refcnt, n);
327 * css_tryget - try to obtain a reference on the specified css
330 * Obtain a reference on @css unless it already has reached zero and is
331 * being released. This function doesn't care whether @css is on or
332 * offline. The caller naturally needs to ensure that @css is accessible
333 * but doesn't have to be holding a reference on it - IOW, RCU protected
334 * access is good enough for this function. Returns %true if a reference
335 * count was successfully obtained; %false otherwise.
337 static inline bool css_tryget(struct cgroup_subsys_state *css)
339 if (!(css->flags & CSS_NO_REF))
340 return percpu_ref_tryget(&css->refcnt);
345 * css_tryget_online - try to obtain a reference on the specified css if online
348 * Obtain a reference on @css if it's online. The caller naturally needs
349 * to ensure that @css is accessible but doesn't have to be holding a
350 * reference on it - IOW, RCU protected access is good enough for this
351 * function. Returns %true if a reference count was successfully obtained;
354 static inline bool css_tryget_online(struct cgroup_subsys_state *css)
356 if (!(css->flags & CSS_NO_REF))
357 return percpu_ref_tryget_live(&css->refcnt);
362 * css_is_dying - test whether the specified css is dying
365 * Test whether @css is in the process of offlining or already offline. In
366 * most cases, ->css_online() and ->css_offline() callbacks should be
367 * enough; however, the actual offline operations are RCU delayed and this
368 * test returns %true also when @css is scheduled to be offlined.
370 * This is useful, for example, when the use case requires synchronous
371 * behavior with respect to cgroup removal. cgroup removal schedules css
372 * offlining but the css can seem alive while the operation is being
373 * delayed. If the delay affects user visible semantics, this test can be
374 * used to resolve the situation.
376 static inline bool css_is_dying(struct cgroup_subsys_state *css)
378 return !(css->flags & CSS_NO_REF) && percpu_ref_is_dying(&css->refcnt);
382 * css_put - put a css reference
385 * Put a reference obtained via css_get() and css_tryget_online().
387 static inline void css_put(struct cgroup_subsys_state *css)
389 if (!(css->flags & CSS_NO_REF))
390 percpu_ref_put(&css->refcnt);
394 * css_put_many - put css references
396 * @n: number of references to put
398 * Put references obtained via css_get() and css_tryget_online().
400 static inline void css_put_many(struct cgroup_subsys_state *css, unsigned int n)
402 if (!(css->flags & CSS_NO_REF))
403 percpu_ref_put_many(&css->refcnt, n);
406 static inline void cgroup_get(struct cgroup *cgrp)
408 css_get(&cgrp->self);
411 static inline bool cgroup_tryget(struct cgroup *cgrp)
413 return css_tryget(&cgrp->self);
416 static inline void cgroup_put(struct cgroup *cgrp)
418 css_put(&cgrp->self);
422 * task_css_set_check - obtain a task's css_set with extra access conditions
423 * @task: the task to obtain css_set for
424 * @__c: extra condition expression to be passed to rcu_dereference_check()
426 * A task's css_set is RCU protected, initialized and exited while holding
427 * task_lock(), and can only be modified while holding both cgroup_mutex
428 * and task_lock() while the task is alive. This macro verifies that the
429 * caller is inside proper critical section and returns @task's css_set.
431 * The caller can also specify additional allowed conditions via @__c, such
432 * as locks used during the cgroup_subsys::attach() methods.
434 #ifdef CONFIG_PROVE_RCU
435 extern struct mutex cgroup_mutex;
436 extern spinlock_t css_set_lock;
437 #define task_css_set_check(task, __c) \
438 rcu_dereference_check((task)->cgroups, \
439 lockdep_is_held(&cgroup_mutex) || \
440 lockdep_is_held(&css_set_lock) || \
441 ((task)->flags & PF_EXITING) || (__c))
443 #define task_css_set_check(task, __c) \
444 rcu_dereference((task)->cgroups)
448 * task_css_check - obtain css for (task, subsys) w/ extra access conds
449 * @task: the target task
450 * @subsys_id: the target subsystem ID
451 * @__c: extra condition expression to be passed to rcu_dereference_check()
453 * Return the cgroup_subsys_state for the (@task, @subsys_id) pair. The
454 * synchronization rules are the same as task_css_set_check().
456 #define task_css_check(task, subsys_id, __c) \
457 task_css_set_check((task), (__c))->subsys[(subsys_id)]
460 * task_css_set - obtain a task's css_set
461 * @task: the task to obtain css_set for
463 * See task_css_set_check().
465 static inline struct css_set *task_css_set(struct task_struct *task)
467 return task_css_set_check(task, false);
471 * task_css - obtain css for (task, subsys)
472 * @task: the target task
473 * @subsys_id: the target subsystem ID
475 * See task_css_check().
477 static inline struct cgroup_subsys_state *task_css(struct task_struct *task,
480 return task_css_check(task, subsys_id, false);
484 * task_get_css - find and get the css for (task, subsys)
485 * @task: the target task
486 * @subsys_id: the target subsystem ID
488 * Find the css for the (@task, @subsys_id) combination, increment a
489 * reference on and return it. This function is guaranteed to return a
492 static inline struct cgroup_subsys_state *
493 task_get_css(struct task_struct *task, int subsys_id)
495 struct cgroup_subsys_state *css;
499 css = task_css(task, subsys_id);
500 if (likely(css_tryget_online(css)))
509 * task_css_is_root - test whether a task belongs to the root css
510 * @task: the target task
511 * @subsys_id: the target subsystem ID
513 * Test whether @task belongs to the root css on the specified subsystem.
514 * May be invoked in any context.
516 static inline bool task_css_is_root(struct task_struct *task, int subsys_id)
518 return task_css_check(task, subsys_id, true) ==
519 init_css_set.subsys[subsys_id];
522 static inline struct cgroup *task_cgroup(struct task_struct *task,
525 return task_css(task, subsys_id)->cgroup;
528 static inline struct cgroup *task_dfl_cgroup(struct task_struct *task)
530 return task_css_set(task)->dfl_cgrp;
533 static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)
535 struct cgroup_subsys_state *parent_css = cgrp->self.parent;
538 return container_of(parent_css, struct cgroup, self);
543 * cgroup_is_descendant - test ancestry
544 * @cgrp: the cgroup to be tested
545 * @ancestor: possible ancestor of @cgrp
547 * Test whether @cgrp is a descendant of @ancestor. It also returns %true
548 * if @cgrp == @ancestor. This function is safe to call as long as @cgrp
549 * and @ancestor are accessible.
551 static inline bool cgroup_is_descendant(struct cgroup *cgrp,
552 struct cgroup *ancestor)
554 if (cgrp->root != ancestor->root || cgrp->level < ancestor->level)
556 return cgrp->ancestor_ids[ancestor->level] == ancestor->id;
560 * cgroup_ancestor - find ancestor of cgroup
561 * @cgrp: cgroup to find ancestor of
562 * @ancestor_level: level of ancestor to find starting from root
564 * Find ancestor of cgroup at specified level starting from root if it exists
565 * and return pointer to it. Return NULL if @cgrp doesn't have ancestor at
568 * This function is safe to call as long as @cgrp is accessible.
570 static inline struct cgroup *cgroup_ancestor(struct cgroup *cgrp,
573 if (cgrp->level < ancestor_level)
575 while (cgrp && cgrp->level > ancestor_level)
576 cgrp = cgroup_parent(cgrp);
581 * task_under_cgroup_hierarchy - test task's membership of cgroup ancestry
582 * @task: the task to be tested
583 * @ancestor: possible ancestor of @task's cgroup
585 * Tests whether @task's default cgroup hierarchy is a descendant of @ancestor.
586 * It follows all the same rules as cgroup_is_descendant, and only applies
587 * to the default hierarchy.
589 static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
590 struct cgroup *ancestor)
592 struct css_set *cset = task_css_set(task);
594 return cgroup_is_descendant(cset->dfl_cgrp, ancestor);
597 /* no synchronization, the result can only be used as a hint */
598 static inline bool cgroup_is_populated(struct cgroup *cgrp)
600 return cgrp->nr_populated_csets + cgrp->nr_populated_domain_children +
601 cgrp->nr_populated_threaded_children;
604 /* returns ino associated with a cgroup */
605 static inline ino_t cgroup_ino(struct cgroup *cgrp)
607 return cgrp->kn->id.ino;
610 /* cft/css accessors for cftype->write() operation */
611 static inline struct cftype *of_cft(struct kernfs_open_file *of)
616 struct cgroup_subsys_state *of_css(struct kernfs_open_file *of);
618 /* cft/css accessors for cftype->seq_*() operations */
619 static inline struct cftype *seq_cft(struct seq_file *seq)
621 return of_cft(seq->private);
624 static inline struct cgroup_subsys_state *seq_css(struct seq_file *seq)
626 return of_css(seq->private);
630 * Name / path handling functions. All are thin wrappers around the kernfs
631 * counterparts and can be called under any context.
634 static inline int cgroup_name(struct cgroup *cgrp, char *buf, size_t buflen)
636 return kernfs_name(cgrp->kn, buf, buflen);
639 static inline int cgroup_path(struct cgroup *cgrp, char *buf, size_t buflen)
641 return kernfs_path(cgrp->kn, buf, buflen);
644 static inline void pr_cont_cgroup_name(struct cgroup *cgrp)
646 pr_cont_kernfs_name(cgrp->kn);
649 static inline void pr_cont_cgroup_path(struct cgroup *cgrp)
651 pr_cont_kernfs_path(cgrp->kn);
654 static inline struct psi_group *cgroup_psi(struct cgroup *cgrp)
659 static inline void cgroup_init_kthreadd(void)
662 * kthreadd is inherited by all kthreads, keep it in the root so
663 * that the new kthreads are guaranteed to stay in the root until
664 * initialization is finished.
666 current->no_cgroup_migration = 1;
669 static inline void cgroup_kthread_ready(void)
672 * This kthread finished initialization. The creator should have
673 * set PF_NO_SETAFFINITY if this kthread should stay in the root.
675 current->no_cgroup_migration = 0;
678 static inline union kernfs_node_id *cgroup_get_kernfs_id(struct cgroup *cgrp)
680 return &cgrp->kn->id;
683 void cgroup_path_from_kernfs_id(const union kernfs_node_id *id,
684 char *buf, size_t buflen);
685 #else /* !CONFIG_CGROUPS */
687 struct cgroup_subsys_state;
690 static inline void css_put(struct cgroup_subsys_state *css) {}
691 static inline int cgroup_attach_task_all(struct task_struct *from,
692 struct task_struct *t) { return 0; }
693 static inline int cgroupstats_build(struct cgroupstats *stats,
694 struct dentry *dentry) { return -EINVAL; }
696 static inline void cgroup_fork(struct task_struct *p) {}
697 static inline int cgroup_can_fork(struct task_struct *p) { return 0; }
698 static inline void cgroup_cancel_fork(struct task_struct *p) {}
699 static inline void cgroup_post_fork(struct task_struct *p) {}
700 static inline void cgroup_exit(struct task_struct *p) {}
701 static inline void cgroup_release(struct task_struct *p) {}
702 static inline void cgroup_free(struct task_struct *p) {}
704 static inline int cgroup_init_early(void) { return 0; }
705 static inline int cgroup_init(void) { return 0; }
706 static inline void cgroup_init_kthreadd(void) {}
707 static inline void cgroup_kthread_ready(void) {}
708 static inline union kernfs_node_id *cgroup_get_kernfs_id(struct cgroup *cgrp)
713 static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)
718 static inline struct psi_group *cgroup_psi(struct cgroup *cgrp)
723 static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
724 struct cgroup *ancestor)
729 static inline void cgroup_path_from_kernfs_id(const union kernfs_node_id *id,
730 char *buf, size_t buflen) {}
731 #endif /* !CONFIG_CGROUPS */
733 #ifdef CONFIG_CGROUPS
735 * cgroup scalable recursive statistics.
737 void cgroup_rstat_updated(struct cgroup *cgrp, int cpu);
738 void cgroup_rstat_flush(struct cgroup *cgrp);
739 void cgroup_rstat_flush_irqsafe(struct cgroup *cgrp);
740 void cgroup_rstat_flush_hold(struct cgroup *cgrp);
741 void cgroup_rstat_flush_release(void);
744 * Basic resource stats.
746 #ifdef CONFIG_CGROUP_CPUACCT
747 void cpuacct_charge(struct task_struct *tsk, u64 cputime);
748 void cpuacct_account_field(struct task_struct *tsk, int index, u64 val);
750 static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {}
751 static inline void cpuacct_account_field(struct task_struct *tsk, int index,
755 void __cgroup_account_cputime(struct cgroup *cgrp, u64 delta_exec);
756 void __cgroup_account_cputime_field(struct cgroup *cgrp,
757 enum cpu_usage_stat index, u64 delta_exec);
759 static inline void cgroup_account_cputime(struct task_struct *task,
764 cpuacct_charge(task, delta_exec);
767 cgrp = task_dfl_cgroup(task);
768 if (cgroup_parent(cgrp))
769 __cgroup_account_cputime(cgrp, delta_exec);
773 static inline void cgroup_account_cputime_field(struct task_struct *task,
774 enum cpu_usage_stat index,
779 cpuacct_account_field(task, index, delta_exec);
782 cgrp = task_dfl_cgroup(task);
783 if (cgroup_parent(cgrp))
784 __cgroup_account_cputime_field(cgrp, index, delta_exec);
788 #else /* CONFIG_CGROUPS */
790 static inline void cgroup_account_cputime(struct task_struct *task,
792 static inline void cgroup_account_cputime_field(struct task_struct *task,
793 enum cpu_usage_stat index,
796 #endif /* CONFIG_CGROUPS */
799 * sock->sk_cgrp_data handling. For more info, see sock_cgroup_data
800 * definition in cgroup-defs.h.
802 #ifdef CONFIG_SOCK_CGROUP_DATA
804 #if defined(CONFIG_CGROUP_NET_PRIO) || defined(CONFIG_CGROUP_NET_CLASSID)
805 extern spinlock_t cgroup_sk_update_lock;
808 void cgroup_sk_alloc_disable(void);
809 void cgroup_sk_alloc(struct sock_cgroup_data *skcd);
810 void cgroup_sk_free(struct sock_cgroup_data *skcd);
812 static inline struct cgroup *sock_cgroup_ptr(struct sock_cgroup_data *skcd)
814 #if defined(CONFIG_CGROUP_NET_PRIO) || defined(CONFIG_CGROUP_NET_CLASSID)
818 * @skcd->val is 64bit but the following is safe on 32bit too as we
819 * just need the lower ulong to be written and read atomically.
821 v = READ_ONCE(skcd->val);
824 return &cgrp_dfl_root.cgrp;
826 return (struct cgroup *)(unsigned long)v ?: &cgrp_dfl_root.cgrp;
828 return (struct cgroup *)(unsigned long)skcd->val;
832 #else /* CONFIG_CGROUP_DATA */
834 static inline void cgroup_sk_alloc(struct sock_cgroup_data *skcd) {}
835 static inline void cgroup_sk_free(struct sock_cgroup_data *skcd) {}
837 #endif /* CONFIG_CGROUP_DATA */
839 struct cgroup_namespace {
842 struct user_namespace *user_ns;
843 struct ucounts *ucounts;
844 struct css_set *root_cset;
847 extern struct cgroup_namespace init_cgroup_ns;
849 #ifdef CONFIG_CGROUPS
851 void free_cgroup_ns(struct cgroup_namespace *ns);
853 struct cgroup_namespace *copy_cgroup_ns(unsigned long flags,
854 struct user_namespace *user_ns,
855 struct cgroup_namespace *old_ns);
857 int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,
858 struct cgroup_namespace *ns);
860 #else /* !CONFIG_CGROUPS */
862 static inline void free_cgroup_ns(struct cgroup_namespace *ns) { }
863 static inline struct cgroup_namespace *
864 copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns,
865 struct cgroup_namespace *old_ns)
870 #endif /* !CONFIG_CGROUPS */
872 static inline void get_cgroup_ns(struct cgroup_namespace *ns)
875 refcount_inc(&ns->count);
878 static inline void put_cgroup_ns(struct cgroup_namespace *ns)
880 if (ns && refcount_dec_and_test(&ns->count))
884 #ifdef CONFIG_CGROUPS
886 void cgroup_enter_frozen(void);
887 void cgroup_leave_frozen(bool always_leave);
888 void cgroup_update_frozen(struct cgroup *cgrp);
889 void cgroup_freeze(struct cgroup *cgrp, bool freeze);
890 void cgroup_freezer_migrate_task(struct task_struct *task, struct cgroup *src,
892 void cgroup_freezer_frozen_exit(struct task_struct *task);
893 static inline bool cgroup_task_freeze(struct task_struct *task)
897 if (task->flags & PF_KTHREAD)
901 ret = test_bit(CGRP_FREEZE, &task_dfl_cgroup(task)->flags);
907 static inline bool cgroup_task_frozen(struct task_struct *task)
912 #else /* !CONFIG_CGROUPS */
914 static inline void cgroup_enter_frozen(void) { }
915 static inline void cgroup_leave_frozen(bool always_leave) { }
916 static inline bool cgroup_task_freeze(struct task_struct *task)
920 static inline bool cgroup_task_frozen(struct task_struct *task)
925 #endif /* !CONFIG_CGROUPS */
927 #endif /* _LINUX_CGROUP_H */