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cgroup: remove cgroupfs_root->refcnt

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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>
This commit is contained in:
Tejun Heo
2014-02-12 09:29:50 -05:00
parent 3c9c825b8b
commit 776f02fa4e
2 changed files with 39 additions and 51 deletions
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4
include/linux/cgroup.h
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@@ -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 */