evie/android_kernel_oneplus_msm8998
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cgroup: add cgroup_subsys->css_released()

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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: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2014-11-18 02:49:51 -05:00
parent db6e305345
commit 7d172cc89b
2 changed files with 3 additions and 0 deletions
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1
include/linux/cgroup.h
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@ -612,6 +612,7 @@ struct cgroup_subsys {
struct cgroup_subsys_state *(*css_alloc)(struct cgroup_subsys_state *parent_css); struct cgroup_subsys_state *(*css_alloc)(struct cgroup_subsys_state *parent_css);
int (*css_online)(struct cgroup_subsys_state *css); int (*css_online)(struct cgroup_subsys_state *css);
void (*css_offline)(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_free)(struct cgroup_subsys_state *css);
void (*css_reset)(struct cgroup_subsys_state *css); void (*css_reset)(struct cgroup_subsys_state *css);

2
kernel/cgroup.c
View file

@ -4380,6 +4380,8 @@ static void css_release_work_fn(struct work_struct *work)
if (ss) { if (ss) {
/* css release path */ /* css release path */
cgroup_idr_remove(&ss->css_idr, css->id); cgroup_idr_remove(&ss->css_idr, css->id);
if (ss->css_released)
ss->css_released(css);
} else { } else {
/* cgroup release path */ /* cgroup release path */
cgroup_idr_remove(&cgrp->root->cgroup_idr, cgrp->id); cgroup_idr_remove(&cgrp->root->cgroup_idr, cgrp->id);