linux-kernel - Re: [PATCH 03/25] Do not check NUMA node ID when the caller knows the node is valid

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Message-ID: <49ED60E9.4030005@cs.helsinki.fi>
Date:	Tue, 21 Apr 2009 09:00:09 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Mel Gorman <mel@....ul.ie>
CC:	Linux Memory Management List <linux-mm@...ck.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lin Ming <ming.m.lin@...el.com>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 03/25] Do not check NUMA node ID when the caller knows
 the node is valid

Mel Gorman wrote:
> Callers of alloc_pages_node() can optionally specify -1 as a node to mean
> "allocate from the current node". However, a number of the callers in fast
> paths know for a fact their node is valid. To avoid a comparison and branch,
> this patch adds alloc_pages_exact_node() that only checks the nid with
> VM_BUG_ON(). Callers that know their node is valid are then converted.
> 
> Signed-off-by: Mel Gorman <mel@....ul.ie>
> Reviewed-by: Christoph Lameter <cl@...ux-foundation.org>

Reviewed-by: Pekka Enberg <penberg@...helsinki.fi>
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