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cgroup: implement __cgroup_task_count() helper 

The helper is identical to the existing cgroup_task_count()
except it doesn't take the css_set_lock by itself, assuming
that the caller does.

Also, move cgroup_task_count() implementation into
kernel/cgroup/cgroup.c, as there is nothing specific to cgroup v1.

Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: kernel-team@fb.com
This commit is contained in:
Roman Gushchin 2019-04-19 10:03:02 -07:00 committed by Tejun Heo
parent 50943f3e13
commit aade7f9efb
3 changed files with 34 additions and 16 deletions
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1
kernel/cgroup/cgroup-internal.h
View File

@ -240,6 +240,7 @@ int cgroup_rmdir(struct kernfs_node *kn);
int cgroup_show_path(struct seq_file *sf, struct kernfs_node *kf_node,
struct kernfs_root *kf_root);
int __cgroup_task_count(const struct cgroup *cgrp);
int cgroup_task_count(const struct cgroup *cgrp);
/*

16
kernel/cgroup/cgroup-v1.c
View File

@ -342,22 +342,6 @@ static struct cgroup_pidlist *cgroup_pidlist_find_create(struct cgroup *cgrp,
return l;
}
/**
* cgroup_task_count - count the number of tasks in a cgroup.
* @cgrp: the cgroup in question
*/
int cgroup_task_count(const struct cgroup *cgrp)
{
int count = 0;
struct cgrp_cset_link *link;
spin_lock_irq(&css_set_lock);
list_for_each_entry(link, &cgrp->cset_links, cset_link)
count += link->cset->nr_tasks;
spin_unlock_irq(&css_set_lock);
return count;
}
/*
* Load a cgroup's pidarray with either procs' tgids or tasks' pids
*/

33
kernel/cgroup/cgroup.c
View File

@ -593,6 +593,39 @@ static void cgroup_get_live(struct cgroup *cgrp)
css_get(&cgrp->self);
}
/**
* __cgroup_task_count - count the number of tasks in a cgroup. The caller
* is responsible for taking the css_set_lock.
* @cgrp: the cgroup in question
*/
int __cgroup_task_count(const struct cgroup *cgrp)
{
int count = 0;
struct cgrp_cset_link *link;
lockdep_assert_held(&css_set_lock);
list_for_each_entry(link, &cgrp->cset_links, cset_link)
count += link->cset->nr_tasks;
return count;
}
/**
* cgroup_task_count - count the number of tasks in a cgroup.
* @cgrp: the cgroup in question
*/
int cgroup_task_count(const struct cgroup *cgrp)
{
int count;
spin_lock_irq(&css_set_lock);
count = __cgroup_task_count(cgrp);
spin_unlock_irq(&css_set_lock);
return count;
}
struct cgroup_subsys_state *of_css(struct kernfs_open_file *of)
{
struct cgroup *cgrp = of->kn->parent->priv;