linux-kernel - Re: [PATCH 06/10] mm: vmscan: Have kswapd writeback pages based on dirty pages encountered, not priority

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Date:	Tue, 19 Mar 2013 10:35:12 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc:	Linux-MM <linux-mm@...ck.org>, Jiri Slaby <jslaby@...e.cz>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Rik van Riel <riel@...hat.com>,
	Zlatko Calusic <zcalusic@...sync.net>,
	Johannes Weiner <hannes@...xchg.org>,
	dormando <dormando@...ia.net>,
	Satoru Moriya <satoru.moriya@....com>,
	Michal Hocko <mhocko@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/10] mm: vmscan: Have kswapd writeback pages based on
 dirty pages encountered, not priority

On Mon, Mar 18, 2013 at 07:08:50PM +0800, Wanpeng Li wrote:
> >@@ -2735,8 +2748,12 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
> > 				end_zone = i;
> > 				break;
> > 			} else {
> >-				/* If balanced, clear the congested flag */
> >+				/*
> >+				 * If balanced, clear the dirty and congested
> >+				 * flags
> >+				 */
> > 				zone_clear_flag(zone, ZONE_CONGESTED);
> >+				zone_clear_flag(zone, ZONE_DIRTY);
> 
> Hi Mel,
> 
> There are two places in balance_pgdat clear ZONE_CONGESTED flag, one
> is during scan zone which have free_pages <= high_wmark_pages(zone), the 
> other one is zone get balanced after reclaim, it seems that you miss the 
> later one.
> 

I did and it's fixed now. Thanks.

-- 
Mel Gorman
SUSE Labs
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