linux-kernel - Re: [PATCH 06/19] Check only once if the zonelist is suitable for the allocation

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Message-ID: <alpine.DEB.1.10.0902241220300.32227@qirst.com>
Date:	Tue, 24 Feb 2009 12:24:28 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
cc:	Linux Memory Management List <linux-mm@...ck.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.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>
Subject: Re: [PATCH 06/19] Check only once if the zonelist is suitable for
 the allocation

On Tue, 24 Feb 2009, Mel Gorman wrote:

> It is possible with __GFP_THISNODE that no zones are suitable. This
> patch makes sure the check is only made once.

GFP_THISNODE is only a performance factor if SLAB is the slab allocator.
The restart logic in __alloc_pages_internal() is mainly used by OOM
processing.

But the patch looks okay regardless...

Reviewed-by: Christoph Lameter <cl@...ux-foundation.org>
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