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

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Message-ID: <20130321181532.GP1878@suse.de>
Date:	Thu, 21 Mar 2013 18:15:32 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Rik van Riel <riel@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Linux-MM <linux-mm@...ck.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	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 Thu, Mar 21, 2013 at 01:53:41PM -0400, Rik van Riel wrote:
> On 03/17/2013 11:11 AM, Mel Gorman wrote:
> >On Sun, Mar 17, 2013 at 07:42:39AM -0700, Andi Kleen wrote:
> >>Mel Gorman <mgorman@...e.de> writes:
> >>
> >>>@@ -495,6 +495,9 @@ typedef enum {
> >>>  	ZONE_CONGESTED,			/* zone has many dirty pages backed by
> >>>  					 * a congested BDI
> >>>  					 */
> >>>+	ZONE_DIRTY,			/* reclaim scanning has recently found
> >>>+					 * many dirty file pages
> >>>+					 */
> >>
> >>Needs a better name. ZONE_DIRTY_CONGESTED ?
> >>
> >
> >That might be confusing. The underlying BDI is not necessarily
> >congested. I accept your point though and will try thinking of a better
> >name.
> 
> ZONE_LOTS_DIRTY ?
> 

I had changed it to

        ZONE_TAIL_LRU_DIRTY,            /* reclaim scanning has recently found
                                         * many dirty file pages at the tail
                                         * of the LRU.
                                         */

Is that reasonable?

-- 
Mel Gorman
SUSE Labs
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