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: <514B4925.2010909@redhat.com>
Date:	Thu, 21 Mar 2013 13:53:41 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
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 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 ?

>>> +	 * currently being written then flag that kswapd should start
>>> +	 * writing back pages.
>>> +	 */
>>> +	if (global_reclaim(sc) && nr_dirty &&
>>> +			nr_dirty >= (nr_taken >> (DEF_PRIORITY - sc->priority)))
>>> +		zone_set_flag(zone, ZONE_DIRTY);
>>> +
>>>   	trace_mm_vmscan_lru_shrink_inactive(zone->zone_pgdat->node_id,
>>
>> I suppose you want to trace the dirty case here too.
>>
>
> I guess it wouldn't hurt to have a new tracepoint for when the flag gets
> set. A vmstat might be helpful as well.
>

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