linux-ext4 - Re: [PATCH] percpu_counter: use local_t and atomic_long

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Message-Id: <1230032601.9487.247.camel@twins>
Date:	Tue, 23 Dec 2008 12:43:21 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Theodore Tso <tytso@....edu>,
	linux kernel <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Mingming Cao <cmm@...ibm.com>, linux-ext4@...r.kernel.org,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [PATCH] percpu_counter: use local_t and atomic_long_t if
 possible

One think that sprung to mind,..

IFF we're going to implement percpu_counter with local_t and make
local_t this funny tri-counter thing which has its own error, you need
to fix up bdi_stat_error() - it expects to be an upper bound for the
counter error, getting that wrong _will_ cause deadlocks.



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