[PATCH v2 -mmotm 2/4] cgroups: remove events before destroying subsystem state objects

[Balbir Singh]

* Kirill A. Shutemov <kirill at shutemov.name> [2010-02-24 13:42:15]:

> On Wed, Feb 24, 2010 at 10:40 AM, Balbir Singh
> <balbir at linux.vnet.ibm.com> wrote:
> > * Kirill A. Shutemov <kirill at shutemov.name> [2010-02-22 17:43:40]:
> >
> >> Events should be removed after rmdir of cgroup directory, but before
> >> destroying subsystem state objects. Let's take reference to cgroup
> >> directory dentry to do that.
> >>
> >> Signed-off-by: Kirill A. Shutemov <kirill at shutemov.name>
> >> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hioryu at jp.fujitsu.com>
> >
> > Looks good, but remember the mem_cgroup data structure will can
> > disappear after the rmdir
> 
> IIUC, struct mem_cgroup can be freed only after ->destroy(), which can
> be called only if there is no references to cgroup directory dentry.
>

No.. You've got it right, it disappears after the last dput(). 

-- 
	Three Cheers,
	Balbir