linux-kernel - [PATCH 2/4] vmscan: drop PF_SWAPWRITE from zone

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Date:	Wed, 13 May 2009 12:06:51 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: [PATCH 2/4] vmscan: drop PF_SWAPWRITE from zone_reclaim

Subject: [PATCH] vmscan: drop PF_SWAPWRITE from zone_reclaim

PF_SWAPWRITE mean ignore write congestion. (see may_write_to_queue())

foreground reclaim shouldn't ignore it because to write congested device cause
large IO lantency.
it isn't better than remote node allocation.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Christoph Lameter <cl@...ux-foundation.org>
Cc: Rik van Riel <riel@...hat.com>
---
 mm/vmscan.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: b/mm/vmscan.c
===================================================================
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2406,7 +2406,7 @@ static int __zone_reclaim(struct zone *z
 	 * and we also need to be able to write out pages for RECLAIM_WRITE
 	 * and RECLAIM_SWAP.
 	 */
-	p->flags |= PF_MEMALLOC | PF_SWAPWRITE;
+	p->flags |= PF_MEMALLOC;
 	reclaim_state.reclaimed_slab = 0;
 	p->reclaim_state = &reclaim_state;
 
@@ -2453,7 +2453,7 @@ static int __zone_reclaim(struct zone *z
 	}
 
 	p->reclaim_state = NULL;
-	current->flags &= ~(PF_MEMALLOC | PF_SWAPWRITE);
+	current->flags &= ~PF_MEMALLOC;
 	return sc.nr_reclaimed >= nr_pages;
 }
 


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