linux-kernel - Re: [PATCH 2/6] change alloc function in pcpu_alloc

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Message-ID: <alpine.DEB.2.00.1004210914570.4959@router.home>
Date:	Wed, 21 Apr 2010 09:15:52 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
cc:	Tejun Heo <tj@...nel.org>, Minchan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Bob Liu <lliubbo@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 2/6] change alloc function in pcpu_alloc_pages

On Tue, 20 Apr 2010, Mel Gorman wrote:

> alloc_pages_exact_node() avoids a branch in a hot path that is checking for
> something the caller already knows. That's the reason it exists.

We can avoid alloc_pages_exact_node() by making all callers of
alloc_pages_node() never use -1. -1 is ambiguous and only rarely will a
caller pass that to alloc_pages_node().


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