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608c1d3c17
Pull cgroup updates from Tejun Heo: "Several notable changes this cycle: - Thread mode was merged. This will be used for cgroup2 support for CPU and possibly other controllers. Unfortunately, CPU controller cgroup2 support didn't make this pull request but most contentions have been resolved and the support is likely to be merged before the next merge window. - cgroup.stat now shows the number of descendant cgroups. - cpuset now can enable the easier-to-configure v2 behavior on v1 hierarchy" * 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: (21 commits) cpuset: Allow v2 behavior in v1 cgroup cgroup: Add mount flag to enable cpuset to use v2 behavior in v1 cgroup cgroup: remove unneeded checks cgroup: misc changes cgroup: short-circuit cset_cgroup_from_root() on the default hierarchy cgroup: re-use the parent pointer in cgroup_destroy_locked() cgroup: add cgroup.stat interface with basic hierarchy stats cgroup: implement hierarchy limits cgroup: keep track of number of descent cgroups cgroup: add comment to cgroup_enable_threaded() cgroup: remove unnecessary empty check when enabling threaded mode cgroup: update debug controller to print out thread mode information cgroup: implement cgroup v2 thread support cgroup: implement CSS_TASK_ITER_THREADED cgroup: introduce cgroup->dom_cgrp and threaded css_set handling cgroup: add @flags to css_task_iter_start() and implement CSS_TASK_ITER_PROCS cgroup: reorganize cgroup.procs / task write path cgroup: replace css_set walking populated test with testing cgrp->nr_populated_csets cgroup: distinguish local and children populated states cgroup: remove now unused list_head @pending in cgroup_apply_cftypes() ...
223 lines
6.8 KiB
C
223 lines
6.8 KiB
C
#ifndef __CGROUP_INTERNAL_H
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#define __CGROUP_INTERNAL_H
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#include <linux/cgroup.h>
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#include <linux/kernfs.h>
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#include <linux/workqueue.h>
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#include <linux/list.h>
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#include <linux/refcount.h>
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/*
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* A cgroup can be associated with multiple css_sets as different tasks may
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* belong to different cgroups on different hierarchies. In the other
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* direction, a css_set is naturally associated with multiple cgroups.
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* This M:N relationship is represented by the following link structure
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* which exists for each association and allows traversing the associations
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* from both sides.
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*/
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struct cgrp_cset_link {
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/* the cgroup and css_set this link associates */
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struct cgroup *cgrp;
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struct css_set *cset;
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/* list of cgrp_cset_links anchored at cgrp->cset_links */
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struct list_head cset_link;
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/* list of cgrp_cset_links anchored at css_set->cgrp_links */
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struct list_head cgrp_link;
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};
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/* used to track tasks and csets during migration */
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struct cgroup_taskset {
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/* the src and dst cset list running through cset->mg_node */
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struct list_head src_csets;
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struct list_head dst_csets;
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/* the number of tasks in the set */
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int nr_tasks;
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/* the subsys currently being processed */
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int ssid;
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/*
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* Fields for cgroup_taskset_*() iteration.
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*
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* Before migration is committed, the target migration tasks are on
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* ->mg_tasks of the csets on ->src_csets. After, on ->mg_tasks of
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* the csets on ->dst_csets. ->csets point to either ->src_csets
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* or ->dst_csets depending on whether migration is committed.
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*
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* ->cur_csets and ->cur_task point to the current task position
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* during iteration.
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*/
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struct list_head *csets;
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struct css_set *cur_cset;
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struct task_struct *cur_task;
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};
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/* migration context also tracks preloading */
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struct cgroup_mgctx {
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/*
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* Preloaded source and destination csets. Used to guarantee
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* atomic success or failure on actual migration.
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*/
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struct list_head preloaded_src_csets;
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struct list_head preloaded_dst_csets;
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/* tasks and csets to migrate */
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struct cgroup_taskset tset;
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/* subsystems affected by migration */
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u16 ss_mask;
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};
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#define CGROUP_TASKSET_INIT(tset) \
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{ \
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.src_csets = LIST_HEAD_INIT(tset.src_csets), \
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.dst_csets = LIST_HEAD_INIT(tset.dst_csets), \
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.csets = &tset.src_csets, \
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}
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#define CGROUP_MGCTX_INIT(name) \
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{ \
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LIST_HEAD_INIT(name.preloaded_src_csets), \
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LIST_HEAD_INIT(name.preloaded_dst_csets), \
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CGROUP_TASKSET_INIT(name.tset), \
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}
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#define DEFINE_CGROUP_MGCTX(name) \
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struct cgroup_mgctx name = CGROUP_MGCTX_INIT(name)
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struct cgroup_sb_opts {
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u16 subsys_mask;
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unsigned int flags;
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char *release_agent;
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bool cpuset_clone_children;
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char *name;
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/* User explicitly requested empty subsystem */
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bool none;
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};
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extern struct mutex cgroup_mutex;
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extern spinlock_t css_set_lock;
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extern struct cgroup_subsys *cgroup_subsys[];
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extern struct list_head cgroup_roots;
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extern struct file_system_type cgroup_fs_type;
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/* iterate across the hierarchies */
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#define for_each_root(root) \
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list_for_each_entry((root), &cgroup_roots, root_list)
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/**
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* for_each_subsys - iterate all enabled cgroup subsystems
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* @ss: the iteration cursor
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* @ssid: the index of @ss, CGROUP_SUBSYS_COUNT after reaching the end
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*/
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#define for_each_subsys(ss, ssid) \
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for ((ssid) = 0; (ssid) < CGROUP_SUBSYS_COUNT && \
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(((ss) = cgroup_subsys[ssid]) || true); (ssid)++)
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static inline bool cgroup_is_dead(const struct cgroup *cgrp)
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{
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return !(cgrp->self.flags & CSS_ONLINE);
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}
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static inline bool notify_on_release(const struct cgroup *cgrp)
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{
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return test_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
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}
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void put_css_set_locked(struct css_set *cset);
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static inline void put_css_set(struct css_set *cset)
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{
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unsigned long flags;
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/*
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* Ensure that the refcount doesn't hit zero while any readers
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* can see it. Similar to atomic_dec_and_lock(), but for an
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* rwlock
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*/
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if (refcount_dec_not_one(&cset->refcount))
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return;
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spin_lock_irqsave(&css_set_lock, flags);
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put_css_set_locked(cset);
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spin_unlock_irqrestore(&css_set_lock, flags);
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}
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/*
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* refcounted get/put for css_set objects
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*/
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static inline void get_css_set(struct css_set *cset)
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{
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refcount_inc(&cset->refcount);
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}
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bool cgroup_ssid_enabled(int ssid);
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bool cgroup_on_dfl(const struct cgroup *cgrp);
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bool cgroup_is_thread_root(struct cgroup *cgrp);
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bool cgroup_is_threaded(struct cgroup *cgrp);
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struct cgroup_root *cgroup_root_from_kf(struct kernfs_root *kf_root);
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struct cgroup *task_cgroup_from_root(struct task_struct *task,
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struct cgroup_root *root);
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struct cgroup *cgroup_kn_lock_live(struct kernfs_node *kn, bool drain_offline);
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void cgroup_kn_unlock(struct kernfs_node *kn);
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int cgroup_path_ns_locked(struct cgroup *cgrp, char *buf, size_t buflen,
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struct cgroup_namespace *ns);
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void cgroup_free_root(struct cgroup_root *root);
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void init_cgroup_root(struct cgroup_root *root, struct cgroup_sb_opts *opts);
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int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask, int ref_flags);
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int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask);
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struct dentry *cgroup_do_mount(struct file_system_type *fs_type, int flags,
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struct cgroup_root *root, unsigned long magic,
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struct cgroup_namespace *ns);
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int cgroup_migrate_vet_dst(struct cgroup *dst_cgrp);
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void cgroup_migrate_finish(struct cgroup_mgctx *mgctx);
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void cgroup_migrate_add_src(struct css_set *src_cset, struct cgroup *dst_cgrp,
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struct cgroup_mgctx *mgctx);
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int cgroup_migrate_prepare_dst(struct cgroup_mgctx *mgctx);
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int cgroup_migrate(struct task_struct *leader, bool threadgroup,
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struct cgroup_mgctx *mgctx);
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int cgroup_attach_task(struct cgroup *dst_cgrp, struct task_struct *leader,
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bool threadgroup);
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struct task_struct *cgroup_procs_write_start(char *buf, bool threadgroup)
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__acquires(&cgroup_threadgroup_rwsem);
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void cgroup_procs_write_finish(struct task_struct *task)
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__releases(&cgroup_threadgroup_rwsem);
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void cgroup_lock_and_drain_offline(struct cgroup *cgrp);
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int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name, umode_t mode);
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int cgroup_rmdir(struct kernfs_node *kn);
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int cgroup_show_path(struct seq_file *sf, struct kernfs_node *kf_node,
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struct kernfs_root *kf_root);
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int cgroup_task_count(const struct cgroup *cgrp);
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/*
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* namespace.c
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*/
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extern const struct proc_ns_operations cgroupns_operations;
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/*
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* cgroup-v1.c
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*/
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extern struct cftype cgroup1_base_files[];
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extern const struct file_operations proc_cgroupstats_operations;
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extern struct kernfs_syscall_ops cgroup1_kf_syscall_ops;
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bool cgroup1_ssid_disabled(int ssid);
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void cgroup1_pidlist_destroy_all(struct cgroup *cgrp);
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void cgroup1_release_agent(struct work_struct *work);
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void cgroup1_check_for_release(struct cgroup *cgrp);
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struct dentry *cgroup1_mount(struct file_system_type *fs_type, int flags,
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void *data, unsigned long magic,
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struct cgroup_namespace *ns);
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#endif /* __CGROUP_INTERNAL_H */
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