Date: Wed, 17 Jun 2009 14:48:36 -0400 (EDT)
From: Christoph Lameter <cl@linux-foundation.org>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
cc: Mel Gorman <mel@csn.ul.ie>, Andrew Morton <akpm@linux-foundation.org>,
       riel@redhat.com, fengguang.wu@intel.com, linuxram@us.ibm.com,
       linux-mm@kvack.org, linux-kernel@vger.kernel.org,
       Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH 0/3] Fix malloc() stall in zone_reclaim() and bring
 behaviour more in line with expectations V3
In-Reply-To: <20090617190204.99C6.A69D9226@jp.fujitsu.com>
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References: <20090616134423.GD14241@csn.ul.ie> <alpine.DEB.1.10.0906161049180.26093@gentwo.org> <20090617190204.99C6.A69D9226@jp.fujitsu.com>
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On Wed, 17 Jun 2009, KOSAKI Motohiro wrote:

> hm, At least major two zone reclaim developer disagree my patch. Thus I have to
> agree with you, because I really don't hope to ignore other developer's opnion.
>
> So, as far as I understand, the conclusion of this thread are
>   - Drop my patch
>   - instead, implement improvement patch of (may_unmap && page_mapped()) case
>   - the documentation should be changed
>   - it's my homework(?)
>
> Can you agree this?

As far as I understand you: Yes. Unmapping can occur in more advanced zone
reclaim modes but the default needs to be as lightweight as possible.

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