diff options
| author | Tejun Heo <tj@kernel.org> | 2014-11-18 02:49:51 -0500 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-11-18 02:49:51 -0500 |
| commit | 7d172cc89b8589e4173d0c73a1ddaae408f29c9d (patch) | |
| tree | ee1bb0594232895aaf2c5c6d604a2e4b8e2cbf4d | |
| parent | db6e3053456800f0a7220b30355bece64764efe7 (diff) | |
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: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
| -rw-r--r-- | include/linux/cgroup.h | 1 | ||||
| -rw-r--r-- | kernel/cgroup.c | 2 |
2 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 1d5196889048..e717a39f22ea 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -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); diff --git a/kernel/cgroup.c b/kernel/cgroup.c index dffa54041d4a..c8558693102b 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -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); |