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| author | Tejun Heo <tj@kernel.org> | 2014-02-12 09:29:50 -0500 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-02-12 09:29:50 -0500 |
| commit | 776f02fa4e1ad70557c0318c70ce928e0642bee0 (patch) | |
| tree | f2080066461b0ef75a964a8ef2b9a2243d7b5389 /include | |
| parent | 3c9c825b8b50de7dbb015e6bfc04bb2da79364d9 (diff) | |
| download | linux-776f02fa4e1ad70557c0318c70ce928e0642bee0.tar.gz linux-776f02fa4e1ad70557c0318c70ce928e0642bee0.tar.bz2 linux-776f02fa4e1ad70557c0318c70ce928e0642bee0.zip | |
cgroup: remove cgroupfs_root->refcnt
Currently, cgroupfs_root and its ->top_cgroup are separated reference
counted and the latter's is ignored. There's no reason to do this
separately. This patch removes cgroupfs_root->refcnt and destroys
cgroupfs_root when the top_cgroup is released.
* cgroup_put() updated to ignore cgroup_is_dead() test for top
cgroups. cgroup_free_fn() updated to handle root destruction when
releasing a top cgroup.
* As root destruction is now bounced through cgroup destruction, it is
asynchronous. Update cgroup_mount() so that it waits for pending
release which is currently implemented using msleep(). Converting
this to proper wait_queue isn't hard but likely unnecessary.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/cgroup.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index f0e6105bbbc1..298d616e8f40 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -282,12 +282,10 @@ struct cgroupfs_root { /* The bitmask of subsystems attached to this hierarchy */ unsigned long subsys_mask; - atomic_t refcnt; - /* Unique id for this hierarchy. */ int hierarchy_id; - /* The root cgroup for this hierarchy */ + /* The root cgroup. Root is destroyed on its release. */ struct cgroup top_cgroup; /* Number of cgroups in the hierarchy, used only for /proc/cgroups */ |