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Commit 7d172cc8 authored by Tejun Heo's avatar Tejun Heo
Browse files

cgroup: add cgroup_subsys->css_released() 



Add a new cgroup subsys callback css_released().  This is called when
the reference count of the css (cgroup_subsys_state) reaches zero
before RCU scheduling free.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarZefan Li <lizefan@huawei.com>
parent db6e3053

include/linux/cgroup.h

+1 −0
Original line number Diff line number Diff line
@@ -612,6 +612,7 @@ struct cgroup_subsys { 
	struct cgroup_subsys_state *(*css_alloc)(struct cgroup_subsys_state *parent_css);

	int (*css_online)(struct cgroup_subsys_state *css);

	void (*css_offline)(struct cgroup_subsys_state *css);

	void (*css_released)(struct cgroup_subsys_state *css);

	void (*css_free)(struct cgroup_subsys_state *css);

	void (*css_reset)(struct cgroup_subsys_state *css);

kernel/cgroup.c

+2 −0
Original line number Diff line number Diff line
@@ -4380,6 +4380,8 @@ static void css_release_work_fn(struct work_struct *work) 
	if (ss) {

		/* css release path */

		cgroup_idr_remove(&ss->css_idr, css->id);

		if (ss->css_released)

			ss->css_released(css);

	} else {

		/* cgroup release path */

		cgroup_idr_remove(&cgrp->root->cgroup_idr, cgrp->id);