linux-kernel - [PATCH 04/27] Check only once if the zonelist is suitable for the allocation

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Message-Id: <1237226020-14057-5-git-send-email-mel@csn.ul.ie>
Date:	Mon, 16 Mar 2009 17:53:18 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Mel Gorman <mel@....ul.ie>,
	Linux Memory Management List <linux-mm@...ck.org>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	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: [PATCH 04/27] Check only once if the zonelist is suitable for the allocation

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

Signed-off-by: Mel Gorman <mel@....ul.ie>
Reviewed-by: Christoph Lameter <cl@...ux-foundation.org>
---
 mm/page_alloc.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index dd87dad..8024abc 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1486,9 +1486,8 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
 	if (should_fail_alloc_page(gfp_mask, order))
 		return NULL;
 
-restart:
-	z = zonelist->_zonerefs;  /* the list of zones suitable for gfp_mask */
-
+	/* the list of zones suitable for gfp_mask */
+	z = zonelist->_zonerefs;
 	if (unlikely(!z->zone)) {
 		/*
 		 * Happens if we have an empty zonelist as a result of
@@ -1497,6 +1496,7 @@ restart:
 		return NULL;
 	}
 
+restart:
 	page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order,
 			zonelist, high_zoneidx, ALLOC_WMARK_LOW|ALLOC_CPUSET);
 	if (page)
-- 
1.5.6.5

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