linux-kernel - Re: [PATCHSET cgroup] extend threadgroup locking

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Message-Id: <201109050605.57360.rjw@sisk.pl>
Date:	Mon, 5 Sep 2011 06:05:57 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Tejun Heo <htejun@...il.com>
Cc:	paul@...lmenage.org, lizf@...fujitsu.com,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, fweisbec@...il.com,
	matthltc@...ibm.com, akpm@...ux-foundation.org
Subject: Re: [PATCHSET cgroup] extend threadgroup locking

Hi,

On Sunday, September 04, 2011, Tejun Heo wrote:
> Hello,
> 
> cgroup currently only blocks new threads from joining the target
> threadgroup during migration, and on-going migration could race
> against exec and exit leading to interesting problems - the symmetry
> between various attach methods, task exiting during method execution,
> ->exit() racing against attach methods, migrating task switching basic
> properties during exec and so on.
> 
> This patchset extends threadgroup locking such that it covers all
> operations which can alter the threadgroup - fork, exit and exec, and
> update cgroup to take advantage of it.  rwsem read ops are added to
> exit path but exec is excluded by grabbing the existing
> cred_guard_mutex from threadgroup locking helper.
> 
> This makes threadgroup locking complete and resolves cgroup issues
> stemming from the target taskset being unstable.
> 
> This patchset is on top of the current pm-freezer + "freezer: fixes &
> simplifications" patchset and contains the following four patches.
> Patch list and diffstat follow.

OK

I'm assuming that there will be a branch for me to pull from when
kernel.org starts to work again, right?

Rafael
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