linux-ext4 - Re: [PATCH, RFC] percpu_counters: make fbc->count read atomic on 32 bit architecture

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Message-Id: <20081006232322.c383fac5.akpm@linux-foundation.org>
Date:	Mon, 6 Oct 2008 23:23:22 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH, RFC] percpu_counters: make fbc->count read atomic on 32
 bit architecture

On Sun, 05 Oct 2008 21:28:10 -0400 "Theodore Ts'o" <tytso@....edu> wrote:

> The following patch has been sitting in the ext4 patch queue for about
> six weeks.  It was there it was a suspected cause for block allocation
> bug.  As I recall, it we found the true root cause since then, but this
> has stuck around since it's a potential problem.  Andrew has expressed
> concerns that this patch might have performance impacts.

Performace impacts I guess we'll just have to put up with.  iirc I was
thinking that this implementation should be pushed down to a kernel-wide
atomic64_t and then the percpu_counters would just use that type.

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