linux-kernel - Re: [PATCH 3/4] mm, rmap: minimize lock hold when unlink_anon

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Message-ID: <20130807061138.GK1845@cmpxchg.org>
Date:	Wed, 7 Aug 2013 02:11:38 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>,
	Minchan Kim <minchan@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Michel Lespinasse <walken@...gle.com>
Subject: Re: [PATCH 3/4] mm, rmap: minimize lock hold when unlink_anon_vmas

On Tue, Aug 06, 2013 at 05:43:39PM +0900, Joonsoo Kim wrote:
> Currently, we free the avc objects with holding a lock. To minimize
> lock hold time, we just move the avc objects to another list
> with holding a lock. Then, iterate them and free objects without holding
> a lock. This makes lock hold time minimized.
> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

I expect kfree() to be fast enough that we don't think we need to
bother batching this outside the lock.
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