linux-kernel - [PATCH 6/7] vmscan: remove PF_SWAPWRITE from __zone

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Message-Id: <20100805151448.31C9.A69D9226@jp.fujitsu.com>
Date:	Thu,  5 Aug 2010 15:15:24 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mel@....ul.ie>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Rik van Riel <riel@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: [PATCH 6/7] vmscan: remove PF_SWAPWRITE from __zone_reclaim()

When zone_reclaim() was merged at first, It always order-0
allocation with PF_SWAPWRITE flag. (probably they are both
unintional).

Former was fixed commit bd2f6199cf (vmscan: respect higher
order in zone_reclaim()). However it expose latter mistake
because !order-0 reclaim often cause dirty pages isolation
and large latency.

Now, we have good opportunity to fix latter too.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 mm/vmscan.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index f21dbeb..e043e97 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2663,7 +2663,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 	 * 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;
 	lockdep_set_current_reclaim_state(gfp_mask);
 	reclaim_state.reclaimed_slab = 0;
 	p->reclaim_state = &reclaim_state;
@@ -2716,7 +2716,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 	}
 
 	p->reclaim_state = NULL;
-	current->flags &= ~(PF_MEMALLOC | PF_SWAPWRITE);
+	current->flags &= ~PF_MEMALLOC;
 	lockdep_clear_current_reclaim_state();
 	return sc.nr_reclaimed >= nr_pages;
 }
-- 
1.6.5.2



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