linux-kernel - Re: [PATCHSET] mempool, percpu, blkcg: fix percpu stat allocation and remove stats

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Message-ID: <20120223232458.GN22536@google.com>
Date:	Thu, 23 Feb 2012 15:24:58 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	vgoyal@...hat.com, axboe@...nel.dk, hughd@...gle.com,
	avi@...hat.com, nate@...nel.net, cl@...ux-foundation.org,
	linux-kernel@...r.kernel.org, dpshah@...gle.com,
	ctalbott@...gle.com, rni@...gle.com
Subject: Re: [PATCHSET] mempool, percpu, blkcg: fix percpu stat allocation
 and remove stats_lock

Hello, Andrew.

On Thu, Feb 23, 2012 at 03:22:23PM -0800, Andrew Morton wrote:
> I forget how those patches work, but they might be vulnerable to the
> same issue.  If the block layer can handle the failed allocation
> attempt and retry at the next I/O event then I guess that would be
> acceptable; we'd lose a bit of statistical info occasionally, but who
> cares.
>
> But ISTR that we can't handle allocation failures here?

It's just gonna skip percpu stats.  The problem with percpu mempool is
more about what __GFP_WAIT means in the interface.  Handling alloc
failure isn't difficult at all.

Thanks.

-- 
tejun
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