linux-kernel - Re: [PATCH 5/5] cgroup: update cgroup_transfer

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Message-ID: <20140212153033.GA26809@htj.dyndns.org>
Date:	Wed, 12 Feb 2014 10:30:33 -0500
From:	Tejun Heo <tj@...nel.org>
To:	lizefan@...wei.com
Cc:	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] cgroup: update cgroup_transfer_tasks() to either
 succeed or fail

On Mon, Feb 10, 2014 at 03:21:34PM -0500, Tejun Heo wrote:
> cgroup_transfer_tasks() can currently fail in the middle due to memory
> allocation failure.  When that happens, the function just aborts and
> returns error code and there's no way to tell how many actually got
> migrated at the point of failure and or to revert the partial
> migration.
> 
> Update it to use cgroup_migrate{_add_src|prepare_dst|migrate|finish}()
> so that the function either succeeds or fails as a whole as long as
> ->can_attach() doesn't fail.

While this solves one aspect of the problem, it may still race with
fork and may leave newly forked tasks behind.  I'll think more about
it.

Thanks.

-- 
tejun
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