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Date: Wed, 30 Nov 2011 08:44:24 +0800
From: Wu Fengguang <fengguang.wu@...el.com>
To: Jan Kara <jack@...e.cz>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
Jens Axboe <axboe@...nel.dk>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Rik van Riel <riel@...hat.com>,
Linux Memory Management List <linux-mm@...ck.org>,
"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/9] readahead: add /debug/readahead/stats
> This looks all inherently racy (which doesn't matter much as you suggest)
> so I just wanted to suggest that if you used per-cpu counters you'd get
> race-free and faster code at the cost of larger data structures and using
> percpu_counter_add() instead of ++ (which doesn't seem like a big
> complication to me).
No problem. I'll switch to per-cpu counters in next post.
Thanks,
Fengguang
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