linux-kernel - Re: [PATCHSET cgroup/for-3.16] cgroup: implement cgroup.populated

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Date:	Fri, 25 Apr 2014 18:30:06 -0400
From:	Tejun Heo <tj@...nel.org>
To:	gregkh@...uxfoundation.org
Cc:	linux-kernel@...r.kernel.org, john@...nmccutchan.com,
	rlove@...ve.org, eparis@...isplace.org, serge.hallyn@...ntu.com,
	lennart@...ttering.net, kay@...y.org, lizefan@...wei.com,
	cgroups@...r.kernel.org, containers@...ts.linux-foundation.org
Subject: Re: [PATCHSET cgroup/for-3.16] cgroup: implement cgroup.populated

On Wed, Apr 09, 2014 at 11:07:29AM -0400, Tejun Heo wrote:
> Hello,
> 
> (inotify folks, can you please review the second patch which hooks up
>  kernfs_notify() with fsnotify?  It works but directly invoking
>  fsnotify_parent() and fsnotify() feels a bit dirty.  Maybe something
>  like fsnotify_notify_modify_by_dentry() would make more sense?)
> 
> cgroup users often need a way to determine when a cgroup's
> subhierarchy becomes empty so that it can be cleaned up.  cgroup
> currently provides release_agent for it; unfortunately, this mechanism
> is riddled with issues.  This patchset implements a replacement
> mechanism "cgroup.subtree_populated" which can be used to monitor
> whether the cgroup's subhierarchy has tasks in it or not and triggers
> poll and [di]notify events when its content changes.
> 
> This patchset contains the following three patches.
> 
>  0001-kernfs-implement-kernfs_root-supers-list.patch
>  0002-kernfs-make-kernfs_notify-trigger-inotify-events-too.patch
>  0003-cgroup-implement-cgroup.subtree_populated-for-the-de.patch

0001-0002 are applied to driver-core-next, which was pulled into
cgroup/for-3.16.   0003 applied to cgroup/for-3.16.

Thanks.

-- 
tejun
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