linux-ext4 - Re: [RFC PATCH -v2] percpu_counters: make fbc->count read atomic on 32 bit architecture

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Message-id: <20080825231805.GB3392@webber.adilger.int>
Date:	Mon, 25 Aug 2008 17:18:05 -0600
From:	Andreas Dilger <adilger@....com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, cmm@...ibm.com,
	tytso@....edu, sandeen@...hat.com, linux-ext4@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH -v2] percpu_counters: make fbc->count read atomic on	32
 bit architecture

On Aug 25, 2008  19:35 +0530, Aneesh Kumar wrote:
> BTW does it make sense to do
> the above unconditionally now ? ie to remove the #if ?. How much
> impact would it be to do read_seqbegin and read_seqretry on a 64bit
> machine too ?

If we don't need it, why do it?  There is no benefit and just overhead.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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