linux-kernel - Re: [PATCHSET] block: remove ioc_*

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Message-ID: <20120320155358.GB5684@google.com>
Date:	Tue, 20 Mar 2012 08:53:58 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org, ctalbott@...gle.com,
	rni@...gle.com
Subject: Re: [PATCHSET] block: remove ioc_*_changed()

On Tue, Mar 20, 2012 at 11:51:18AM -0400, Vivek Goyal wrote:
> So this patch still breaks cic->cfqq association in asynchronous
> manner, when new request comes in. So it will still not solve the
> problem I reported where after doing IO a task changes cgroup and
> tries to delete the old cgroup and hangs forever as cic->cfqq is still
> holding a reference to cgroup?

That one is gonna have to be fixed from cgroup side.  I already posted
a RFC patchset (you were cc'd there, I think).  At the moment, the
blocking thing is memcg's ->pre_destroy() usage.  I'll ping memcg
people once more and if modification there isn't feasible, will
implement a workaround in cgroup core.

Thanks.

-- 
tejun
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