linux-kernel - Re: [PATCH 08/12] mm: fixup possible deadlock

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Message-Id: <20070405154350.0ea203ea.akpm@linux-foundation.org>
Date:	Thu, 5 Apr 2007 15:43:50 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	root@...gramming.kicks-ass.net
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	miklos@...redi.hu, neilb@...e.de, dgc@....com,
	tomoki.sekiyama.qu@...achi.com, a.p.zijlstra@...llo.nl,
	nikita@...sterfs.com
Subject: Re: [PATCH 08/12] mm: fixup possible deadlock

On Thu, 05 Apr 2007 19:42:17 +0200
root@...gramming.kicks-ass.net wrote:

> When the threshol is in the order of the per cpu inaccuracies we can
> deadlock by not receiveing the updated count,

That explanation is a bit, umm, terse.

> introduce a more expensive
> but more accurate stat read function to use on low thresholds.

Looks like percpu_counter_sum().
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