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 list_head *cur_tasks_head;
66 struct css_set *cur_cset;
67 struct css_set *cur_dcset;
68 struct task_struct *cur_task;
69 struct list_head iters_node; /* css_set->task_iters */
72 extern struct file_system_type cgroup_fs_type;
73 extern struct cgroup_root cgrp_dfl_root;
74 extern struct css_set init_css_set;
76 #define SUBSYS(_x) extern struct cgroup_subsys _x ## _cgrp_subsys;
77 #include <linux/cgroup_subsys.h>
81 extern struct static_key_true _x ## _cgrp_subsys_enabled_key; \
82 extern struct static_key_true _x ## _cgrp_subsys_on_dfl_key;
83 #include <linux/cgroup_subsys.h>
87 * cgroup_subsys_enabled - fast test on whether a subsys is enabled
88 * @ss: subsystem in question
90 #define cgroup_subsys_enabled(ss) \
91 static_branch_likely(&ss ## _enabled_key)
94 * cgroup_subsys_on_dfl - fast test on whether a subsys is on default hierarchy
95 * @ss: subsystem in question
97 #define cgroup_subsys_on_dfl(ss) \
98 static_branch_likely(&ss ## _on_dfl_key)
100 bool css_has_online_children(struct cgroup_subsys_state *css);
101 struct cgroup_subsys_state *css_from_id(int id, struct cgroup_subsys *ss);
102 struct cgroup_subsys_state *cgroup_e_css(struct cgroup *cgroup,
103 struct cgroup_subsys *ss);
104 struct cgroup_subsys_state *cgroup_get_e_css(struct cgroup *cgroup,
105 struct cgroup_subsys *ss);
106 struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry,
107 struct cgroup_subsys *ss);
109 struct cgroup *cgroup_get_from_path(const char *path);
110 struct cgroup *cgroup_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);
120 int task_cgroup_path(struct task_struct *task, char *buf, size_t buflen);
121 int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry);
122 int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
123 struct pid *pid, struct task_struct *tsk);
125 void cgroup_fork(struct task_struct *p);
126 extern int cgroup_can_fork(struct task_struct *p);
127 extern void cgroup_cancel_fork(struct task_struct *p);
128 extern void cgroup_post_fork(struct task_struct *p);
129 void cgroup_exit(struct task_struct *p);
130 void cgroup_release(struct task_struct *p);
131 void cgroup_free(struct task_struct *p);
133 int cgroup_init_early(void);
134 int cgroup_init(void);
136 int cgroup_parse_float(const char *input, unsigned dec_shift, s64 *v);
139 * Iteration helpers and macros.
142 struct cgroup_subsys_state *css_next_child(struct cgroup_subsys_state *pos,
143 struct cgroup_subsys_state *parent);
144 struct cgroup_subsys_state *css_next_descendant_pre(struct cgroup_subsys_state *pos,
145 struct cgroup_subsys_state *css);
146 struct cgroup_subsys_state *css_rightmost_descendant(struct cgroup_subsys_state *pos);
147 struct cgroup_subsys_state *css_next_descendant_post(struct cgroup_subsys_state *pos,
148 struct cgroup_subsys_state *css);
150 struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset,
151 struct cgroup_subsys_state **dst_cssp);
152 struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset,
153 struct cgroup_subsys_state **dst_cssp);
155 void cgroup_enable_task_cg_lists(void);
156 void css_task_iter_start(struct cgroup_subsys_state *css, unsigned int flags,
157 struct css_task_iter *it);
158 struct task_struct *css_task_iter_next(struct css_task_iter *it);
159 void css_task_iter_end(struct css_task_iter *it);
162 * css_for_each_child - iterate through children of a css
163 * @pos: the css * to use as the loop cursor
164 * @parent: css whose children to walk
166 * Walk @parent's children. Must be called under rcu_read_lock().
168 * If a subsystem synchronizes ->css_online() and the start of iteration, a
169 * css which finished ->css_online() is guaranteed to be visible in the
170 * future iterations and will stay visible until the last reference is put.
171 * A css which hasn't finished ->css_online() or already finished
172 * ->css_offline() may show up during traversal. It's each subsystem's
173 * responsibility to synchronize against on/offlining.
175 * It is allowed to temporarily drop RCU read lock during iteration. The
176 * caller is responsible for ensuring that @pos remains accessible until
177 * the start of the next iteration by, for example, bumping the css refcnt.
179 #define css_for_each_child(pos, parent) \
180 for ((pos) = css_next_child(NULL, (parent)); (pos); \
181 (pos) = css_next_child((pos), (parent)))
184 * css_for_each_descendant_pre - pre-order walk of a css's descendants
185 * @pos: the css * to use as the loop cursor
186 * @root: css whose descendants to walk
188 * Walk @root's descendants. @root is included in the iteration and the
189 * first node to be visited. Must be called under rcu_read_lock().
191 * If a subsystem synchronizes ->css_online() and the start of iteration, a
192 * css which finished ->css_online() is guaranteed to be visible in the
193 * future iterations and will stay visible until the last reference is put.
194 * A css which hasn't finished ->css_online() or already finished
195 * ->css_offline() may show up during traversal. It's each subsystem's
196 * responsibility to synchronize against on/offlining.
198 * For example, the following guarantees that a descendant can't escape
199 * state updates of its ancestors.
203 * Lock @css's parent and @css;
204 * Inherit state from the parent;
208 * my_update_state(@css)
210 * css_for_each_descendant_pre(@pos, @css) {
213 * Update @css's state;
215 * Verify @pos is alive and inherit state from its parent;
220 * As long as the inheriting step, including checking the parent state, is
221 * enclosed inside @pos locking, double-locking the parent isn't necessary
222 * while inheriting. The state update to the parent is guaranteed to be
223 * visible by walking order and, as long as inheriting operations to the
224 * same @pos are atomic to each other, multiple updates racing each other
225 * still result in the correct state. It's guaranateed that at least one
226 * inheritance happens for any css after the latest update to its parent.
228 * If checking parent's state requires locking the parent, each inheriting
229 * iteration should lock and unlock both @pos->parent and @pos.
231 * Alternatively, a subsystem may choose to use a single global lock to
232 * synchronize ->css_online() and ->css_offline() against tree-walking
235 * It is allowed to temporarily drop RCU read lock during iteration. The
236 * caller is responsible for ensuring that @pos remains accessible until
237 * the start of the next iteration by, for example, bumping the css refcnt.
239 #define css_for_each_descendant_pre(pos, css) \
240 for ((pos) = css_next_descendant_pre(NULL, (css)); (pos); \
241 (pos) = css_next_descendant_pre((pos), (css)))
244 * css_for_each_descendant_post - post-order walk of a css's descendants
245 * @pos: the css * to use as the loop cursor
246 * @css: css whose descendants to walk
248 * Similar to css_for_each_descendant_pre() but performs post-order
249 * traversal instead. @root is included in the iteration and the last
250 * node to be visited.
252 * If a subsystem synchronizes ->css_online() and the start of iteration, a
253 * css which finished ->css_online() is guaranteed to be visible in the
254 * future iterations and will stay visible until the last reference is put.
255 * A css which hasn't finished ->css_online() or already finished
256 * ->css_offline() may show up during traversal. It's each subsystem's
257 * responsibility to synchronize against on/offlining.
259 * Note that the walk visibility guarantee example described in pre-order
260 * walk doesn't apply the same to post-order walks.
262 #define css_for_each_descendant_post(pos, css) \
263 for ((pos) = css_next_descendant_post(NULL, (css)); (pos); \
264 (pos) = css_next_descendant_post((pos), (css)))
267 * cgroup_taskset_for_each - iterate cgroup_taskset
268 * @task: the loop cursor
269 * @dst_css: the destination css
270 * @tset: taskset to iterate
272 * @tset may contain multiple tasks and they may belong to multiple
275 * On the v2 hierarchy, there may be tasks from multiple processes and they
276 * may not share the source or destination csses.
278 * On traditional hierarchies, when there are multiple tasks in @tset, if a
279 * task of a process is in @tset, all tasks of the process are in @tset.
280 * Also, all are guaranteed to share the same source and destination csses.
282 * Iteration is not in any specific order.
284 #define cgroup_taskset_for_each(task, dst_css, tset) \
285 for ((task) = cgroup_taskset_first((tset), &(dst_css)); \
287 (task) = cgroup_taskset_next((tset), &(dst_css)))
290 * cgroup_taskset_for_each_leader - iterate group leaders in a cgroup_taskset
291 * @leader: the loop cursor
292 * @dst_css: the destination css
293 * @tset: taskset to iterate
295 * Iterate threadgroup leaders of @tset. For single-task migrations, @tset
296 * may not contain any.
298 #define cgroup_taskset_for_each_leader(leader, dst_css, tset) \
299 for ((leader) = cgroup_taskset_first((tset), &(dst_css)); \
301 (leader) = cgroup_taskset_next((tset), &(dst_css))) \
302 if ((leader) != (leader)->group_leader) \
311 * css_get - obtain a reference on the specified css
314 * The caller must already have a reference.
316 static inline void css_get(struct cgroup_subsys_state *css)
318 if (!(css->flags & CSS_NO_REF))
319 percpu_ref_get(&css->refcnt);
323 * css_get_many - obtain references on the specified css
325 * @n: number of references to get
327 * The caller must already have a reference.
329 static inline void css_get_many(struct cgroup_subsys_state *css, unsigned int n)
331 if (!(css->flags & CSS_NO_REF))
332 percpu_ref_get_many(&css->refcnt, n);
336 * css_tryget - try to obtain a reference on the specified css
339 * Obtain a reference on @css unless it already has reached zero and is
340 * being released. This function doesn't care whether @css is on or
341 * offline. The caller naturally needs to ensure that @css is accessible
342 * but doesn't have to be holding a reference on it - IOW, RCU protected
343 * access is good enough for this function. Returns %true if a reference
344 * count was successfully obtained; %false otherwise.
346 static inline bool css_tryget(struct cgroup_subsys_state *css)
348 if (!(css->flags & CSS_NO_REF))
349 return percpu_ref_tryget(&css->refcnt);
354 * css_tryget_online - try to obtain a reference on the specified css if online
357 * Obtain a reference on @css if it's online. The caller naturally needs
358 * to ensure that @css is accessible but doesn't have to be holding a
359 * reference on it - IOW, RCU protected access is good enough for this
360 * function. Returns %true if a reference count was successfully obtained;
363 static inline bool css_tryget_online(struct cgroup_subsys_state *css)
365 if (!(css->flags & CSS_NO_REF))
366 return percpu_ref_tryget_live(&css->refcnt);
371 * css_is_dying - test whether the specified css is dying
374 * Test whether @css is in the process of offlining or already offline. In
375 * most cases, ->css_online() and ->css_offline() callbacks should be
376 * enough; however, the actual offline operations are RCU delayed and this
377 * test returns %true also when @css is scheduled to be offlined.
379 * This is useful, for example, when the use case requires synchronous
380 * behavior with respect to cgroup removal. cgroup removal schedules css
381 * offlining but the css can seem alive while the operation is being
382 * delayed. If the delay affects user visible semantics, this test can be
383 * used to resolve the situation.
385 static inline bool css_is_dying(struct cgroup_subsys_state *css)
387 return !(css->flags & CSS_NO_REF) && percpu_ref_is_dying(&css->refcnt);
391 * css_put - put a css reference
394 * Put a reference obtained via css_get() and css_tryget_online().
396 static inline void css_put(struct cgroup_subsys_state *css)
398 if (!(css->flags & CSS_NO_REF))
399 percpu_ref_put(&css->refcnt);
403 * css_put_many - put css references
405 * @n: number of references to put
407 * Put references obtained via css_get() and css_tryget_online().
409 static inline void css_put_many(struct cgroup_subsys_state *css, unsigned int n)
411 if (!(css->flags & CSS_NO_REF))
412 percpu_ref_put_many(&css->refcnt, n);
415 static inline void cgroup_get(struct cgroup *cgrp)
417 css_get(&cgrp->self);
420 static inline bool cgroup_tryget(struct cgroup *cgrp)
422 return css_tryget(&cgrp->self);
425 static inline void cgroup_put(struct cgroup *cgrp)
427 css_put(&cgrp->self);
431 * task_css_set_check - obtain a task's css_set with extra access conditions
432 * @task: the task to obtain css_set for
433 * @__c: extra condition expression to be passed to rcu_dereference_check()
435 * A task's css_set is RCU protected, initialized and exited while holding
436 * task_lock(), and can only be modified while holding both cgroup_mutex
437 * and task_lock() while the task is alive. This macro verifies that the
438 * caller is inside proper critical section and returns @task's css_set.
440 * The caller can also specify additional allowed conditions via @__c, such
441 * as locks used during the cgroup_subsys::attach() methods.
443 #ifdef CONFIG_PROVE_RCU
444 extern struct mutex cgroup_mutex;
445 extern spinlock_t css_set_lock;
446 #define task_css_set_check(task, __c) \
447 rcu_dereference_check((task)->cgroups, \
448 lockdep_is_held(&cgroup_mutex) || \
449 lockdep_is_held(&css_set_lock) || \
450 ((task)->flags & PF_EXITING) || (__c))
452 #define task_css_set_check(task, __c) \
453 rcu_dereference((task)->cgroups)
457 * task_css_check - obtain css for (task, subsys) w/ extra access conds
458 * @task: the target task
459 * @subsys_id: the target subsystem ID
460 * @__c: extra condition expression to be passed to rcu_dereference_check()
462 * Return the cgroup_subsys_state for the (@task, @subsys_id) pair. The
463 * synchronization rules are the same as task_css_set_check().
465 #define task_css_check(task, subsys_id, __c) \
466 task_css_set_check((task), (__c))->subsys[(subsys_id)]
469 * task_css_set - obtain a task's css_set
470 * @task: the task to obtain css_set for
472 * See task_css_set_check().
474 static inline struct css_set *task_css_set(struct task_struct *task)
476 return task_css_set_check(task, false);
480 * task_css - obtain css for (task, subsys)
481 * @task: the target task
482 * @subsys_id: the target subsystem ID
484 * See task_css_check().
486 static inline struct cgroup_subsys_state *task_css(struct task_struct *task,
489 return task_css_check(task, subsys_id, false);
493 * task_get_css - find and get the css for (task, subsys)
494 * @task: the target task
495 * @subsys_id: the target subsystem ID
497 * Find the css for the (@task, @subsys_id) combination, increment a
498 * reference on and return it. This function is guaranteed to return a
499 * valid css. The returned css may already have been offlined.
501 static inline struct cgroup_subsys_state *
502 task_get_css(struct task_struct *task, int subsys_id)
504 struct cgroup_subsys_state *css;
508 css = task_css(task, subsys_id);
510 * Can't use css_tryget_online() here. A task which has
511 * PF_EXITING set may stay associated with an offline css.
512 * If such task calls this function, css_tryget_online()
515 if (likely(css_tryget(css)))
524 * task_css_is_root - test whether a task belongs to the root css
525 * @task: the target task
526 * @subsys_id: the target subsystem ID
528 * Test whether @task belongs to the root css on the specified subsystem.
529 * May be invoked in any context.
531 static inline bool task_css_is_root(struct task_struct *task, int subsys_id)
533 return task_css_check(task, subsys_id, true) ==
534 init_css_set.subsys[subsys_id];
537 static inline struct cgroup *task_cgroup(struct task_struct *task,
540 return task_css(task, subsys_id)->cgroup;
543 static inline struct cgroup *task_dfl_cgroup(struct task_struct *task)
545 return task_css_set(task)->dfl_cgrp;
548 static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)
550 struct cgroup_subsys_state *parent_css = cgrp->self.parent;
553 return container_of(parent_css, struct cgroup, self);
558 * cgroup_is_descendant - test ancestry
559 * @cgrp: the cgroup to be tested
560 * @ancestor: possible ancestor of @cgrp
562 * Test whether @cgrp is a descendant of @ancestor. It also returns %true
563 * if @cgrp == @ancestor. This function is safe to call as long as @cgrp
564 * and @ancestor are accessible.
566 static inline bool cgroup_is_descendant(struct cgroup *cgrp,
567 struct cgroup *ancestor)
569 if (cgrp->root != ancestor->root || cgrp->level < ancestor->level)
571 return cgrp->ancestor_ids[ancestor->level] == ancestor->id;
575 * cgroup_ancestor - find ancestor of cgroup
576 * @cgrp: cgroup to find ancestor of
577 * @ancestor_level: level of ancestor to find starting from root
579 * Find ancestor of cgroup at specified level starting from root if it exists
580 * and return pointer to it. Return NULL if @cgrp doesn't have ancestor at
583 * This function is safe to call as long as @cgrp is accessible.
585 static inline struct cgroup *cgroup_ancestor(struct cgroup *cgrp,
588 if (cgrp->level < ancestor_level)
590 while (cgrp && cgrp->level > ancestor_level)
591 cgrp = cgroup_parent(cgrp);
596 * task_under_cgroup_hierarchy - test task's membership of cgroup ancestry
597 * @task: the task to be tested
598 * @ancestor: possible ancestor of @task's cgroup
600 * Tests whether @task's default cgroup hierarchy is a descendant of @ancestor.
601 * It follows all the same rules as cgroup_is_descendant, and only applies
602 * to the default hierarchy.
604 static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
605 struct cgroup *ancestor)
607 struct css_set *cset = task_css_set(task);
609 return cgroup_is_descendant(cset->dfl_cgrp, ancestor);
612 /* no synchronization, the result can only be used as a hint */
613 static inline bool cgroup_is_populated(struct cgroup *cgrp)
615 return cgrp->nr_populated_csets + cgrp->nr_populated_domain_children +
616 cgrp->nr_populated_threaded_children;
619 /* returns ino associated with a cgroup */
620 static inline ino_t cgroup_ino(struct cgroup *cgrp)
622 return cgrp->kn->id.ino;
625 /* cft/css accessors for cftype->write() operation */
626 static inline struct cftype *of_cft(struct kernfs_open_file *of)
631 struct cgroup_subsys_state *of_css(struct kernfs_open_file *of);
633 /* cft/css accessors for cftype->seq_*() operations */
634 static inline struct cftype *seq_cft(struct seq_file *seq)
636 return of_cft(seq->private);
639 static inline struct cgroup_subsys_state *seq_css(struct seq_file *seq)
641 return of_css(seq->private);
645 * Name / path handling functions. All are thin wrappers around the kernfs
646 * counterparts and can be called under any context.
649 static inline int cgroup_name(struct cgroup *cgrp, char *buf, size_t buflen)
651 return kernfs_name(cgrp->kn, buf, buflen);
654 static inline int cgroup_path(struct cgroup *cgrp, char *buf, size_t buflen)
656 return kernfs_path(cgrp->kn, buf, buflen);
659 static inline void pr_cont_cgroup_name(struct cgroup *cgrp)
661 pr_cont_kernfs_name(cgrp->kn);
664 static inline void pr_cont_cgroup_path(struct cgroup *cgrp)
666 pr_cont_kernfs_path(cgrp->kn);
669 static inline struct psi_group *cgroup_psi(struct cgroup *cgrp)
674 static inline void cgroup_init_kthreadd(void)
677 * kthreadd is inherited by all kthreads, keep it in the root so
678 * that the new kthreads are guaranteed to stay in the root until
679 * initialization is finished.
681 current->no_cgroup_migration = 1;
684 static inline void cgroup_kthread_ready(void)
687 * This kthread finished initialization. The creator should have
688 * set PF_NO_SETAFFINITY if this kthread should stay in the root.
690 current->no_cgroup_migration = 0;
693 static inline union kernfs_node_id *cgroup_get_kernfs_id(struct cgroup *cgrp)
695 return &cgrp->kn->id;
698 void cgroup_path_from_kernfs_id(const union kernfs_node_id *id,
699 char *buf, size_t buflen);
700 #else /* !CONFIG_CGROUPS */
702 struct cgroup_subsys_state;
705 static inline void css_get(struct cgroup_subsys_state *css) {}
706 static inline void css_put(struct cgroup_subsys_state *css) {}
707 static inline int cgroup_attach_task_all(struct task_struct *from,
708 struct task_struct *t) { return 0; }
709 static inline int cgroupstats_build(struct cgroupstats *stats,
710 struct dentry *dentry) { return -EINVAL; }
712 static inline void cgroup_fork(struct task_struct *p) {}
713 static inline int cgroup_can_fork(struct task_struct *p) { return 0; }
714 static inline void cgroup_cancel_fork(struct task_struct *p) {}
715 static inline void cgroup_post_fork(struct task_struct *p) {}
716 static inline void cgroup_exit(struct task_struct *p) {}
717 static inline void cgroup_release(struct task_struct *p) {}
718 static inline void cgroup_free(struct task_struct *p) {}
720 static inline int cgroup_init_early(void) { return 0; }
721 static inline int cgroup_init(void) { return 0; }
722 static inline void cgroup_init_kthreadd(void) {}
723 static inline void cgroup_kthread_ready(void) {}
724 static inline union kernfs_node_id *cgroup_get_kernfs_id(struct cgroup *cgrp)
729 static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)
734 static inline struct psi_group *cgroup_psi(struct cgroup *cgrp)
739 static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
740 struct cgroup *ancestor)
745 static inline void cgroup_path_from_kernfs_id(const union kernfs_node_id *id,
746 char *buf, size_t buflen) {}
747 #endif /* !CONFIG_CGROUPS */
749 #ifdef CONFIG_CGROUPS
751 * cgroup scalable recursive statistics.
753 void cgroup_rstat_updated(struct cgroup *cgrp, int cpu);
754 void cgroup_rstat_flush(struct cgroup *cgrp);
755 void cgroup_rstat_flush_irqsafe(struct cgroup *cgrp);
756 void cgroup_rstat_flush_hold(struct cgroup *cgrp);
757 void cgroup_rstat_flush_release(void);
760 * Basic resource stats.
762 #ifdef CONFIG_CGROUP_CPUACCT
763 void cpuacct_charge(struct task_struct *tsk, u64 cputime);
764 void cpuacct_account_field(struct task_struct *tsk, int index, u64 val);
766 static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {}
767 static inline void cpuacct_account_field(struct task_struct *tsk, int index,
771 void __cgroup_account_cputime(struct cgroup *cgrp, u64 delta_exec);
772 void __cgroup_account_cputime_field(struct cgroup *cgrp,
773 enum cpu_usage_stat index, u64 delta_exec);
775 static inline void cgroup_account_cputime(struct task_struct *task,
780 cpuacct_charge(task, delta_exec);
783 cgrp = task_dfl_cgroup(task);
784 if (cgroup_parent(cgrp))
785 __cgroup_account_cputime(cgrp, delta_exec);
789 static inline void cgroup_account_cputime_field(struct task_struct *task,
790 enum cpu_usage_stat index,
795 cpuacct_account_field(task, index, delta_exec);
798 cgrp = task_dfl_cgroup(task);
799 if (cgroup_parent(cgrp))
800 __cgroup_account_cputime_field(cgrp, index, delta_exec);
804 #else /* CONFIG_CGROUPS */
806 static inline void cgroup_account_cputime(struct task_struct *task,
808 static inline void cgroup_account_cputime_field(struct task_struct *task,
809 enum cpu_usage_stat index,
812 #endif /* CONFIG_CGROUPS */
815 * sock->sk_cgrp_data handling. For more info, see sock_cgroup_data
816 * definition in cgroup-defs.h.
818 #ifdef CONFIG_SOCK_CGROUP_DATA
820 #if defined(CONFIG_CGROUP_NET_PRIO) || defined(CONFIG_CGROUP_NET_CLASSID)
821 extern spinlock_t cgroup_sk_update_lock;
824 void cgroup_sk_alloc_disable(void);
825 void cgroup_sk_alloc(struct sock_cgroup_data *skcd);
826 void cgroup_sk_clone(struct sock_cgroup_data *skcd);
827 void cgroup_sk_free(struct sock_cgroup_data *skcd);
829 static inline struct cgroup *sock_cgroup_ptr(struct sock_cgroup_data *skcd)
831 #if defined(CONFIG_CGROUP_NET_PRIO) || defined(CONFIG_CGROUP_NET_CLASSID)
835 * @skcd->val is 64bit but the following is safe on 32bit too as we
836 * just need the lower ulong to be written and read atomically.
838 v = READ_ONCE(skcd->val);
841 return &cgrp_dfl_root.cgrp;
843 return (struct cgroup *)(unsigned long)v ?: &cgrp_dfl_root.cgrp;
845 return (struct cgroup *)(unsigned long)skcd->val;
849 #else /* CONFIG_CGROUP_DATA */
851 static inline void cgroup_sk_alloc(struct sock_cgroup_data *skcd) {}
852 static inline void cgroup_sk_clone(struct sock_cgroup_data *skcd) {}
853 static inline void cgroup_sk_free(struct sock_cgroup_data *skcd) {}
855 #endif /* CONFIG_CGROUP_DATA */
857 struct cgroup_namespace {
860 struct user_namespace *user_ns;
861 struct ucounts *ucounts;
862 struct css_set *root_cset;
865 extern struct cgroup_namespace init_cgroup_ns;
867 #ifdef CONFIG_CGROUPS
869 void free_cgroup_ns(struct cgroup_namespace *ns);
871 struct cgroup_namespace *copy_cgroup_ns(unsigned long flags,
872 struct user_namespace *user_ns,
873 struct cgroup_namespace *old_ns);
875 int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,
876 struct cgroup_namespace *ns);
878 #else /* !CONFIG_CGROUPS */
880 static inline void free_cgroup_ns(struct cgroup_namespace *ns) { }
881 static inline struct cgroup_namespace *
882 copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns,
883 struct cgroup_namespace *old_ns)
888 #endif /* !CONFIG_CGROUPS */
890 static inline void get_cgroup_ns(struct cgroup_namespace *ns)
893 refcount_inc(&ns->count);
896 static inline void put_cgroup_ns(struct cgroup_namespace *ns)
898 if (ns && refcount_dec_and_test(&ns->count))
902 #ifdef CONFIG_CGROUPS
904 void cgroup_enter_frozen(void);
905 void cgroup_leave_frozen(bool always_leave);
906 void cgroup_update_frozen(struct cgroup *cgrp);
907 void cgroup_freeze(struct cgroup *cgrp, bool freeze);
908 void cgroup_freezer_migrate_task(struct task_struct *task, struct cgroup *src,
911 static inline bool cgroup_task_freeze(struct task_struct *task)
915 if (task->flags & PF_KTHREAD)
919 ret = test_bit(CGRP_FREEZE, &task_dfl_cgroup(task)->flags);
925 static inline bool cgroup_task_frozen(struct task_struct *task)
930 #else /* !CONFIG_CGROUPS */
932 static inline void cgroup_enter_frozen(void) { }
933 static inline void cgroup_leave_frozen(bool always_leave) { }
934 static inline bool cgroup_task_freeze(struct task_struct *task)
938 static inline bool cgroup_task_frozen(struct task_struct *task)
943 #endif /* !CONFIG_CGROUPS */
945 #ifdef CONFIG_CGROUP_BPF
946 static inline void cgroup_bpf_get(struct cgroup *cgrp)
948 percpu_ref_get(&cgrp->bpf.refcnt);
951 static inline void cgroup_bpf_put(struct cgroup *cgrp)
953 percpu_ref_put(&cgrp->bpf.refcnt);
956 #else /* CONFIG_CGROUP_BPF */
958 static inline void cgroup_bpf_get(struct cgroup *cgrp) {}
959 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
961 #endif /* CONFIG_CGROUP_BPF */
963 #endif /* _LINUX_CGROUP_H */