From: Christoph Lameter <cl@linux-foundation.org>
To: Andy Whitcroft <apw@shadowen.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Peter Zijlstra <peterz@infradead.org>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 4/4] capture pages freed during direct reclaim for allocation by the reclaimer
Date: Thu, 02 Oct 2008 11:29:32 -0500 [thread overview]
Message-ID: <48E4F6EC.7010500@linux-foundation.org> (raw)
In-Reply-To: <20081002143508.GE11089@brain>
Andy Whitcroft wrote:
>> At the beginning of reclaim just flush all pcp pages and then do not allow pcp
>> refills again until reclaim is finished?
>
> Not entirely, some pages could get trapped there for sure. But it is
> parallel allocations we are trying to guard against. Plus we already flush
> the pcp during reclaim for higher orders.
So we just would need to forbid refilling the pcp.
Parallel allocations are less a problem if the freed order 0 pages get merged
immediately into the order 1 freelist. Of course that will only work 50% of
the time but it will have a similar effect to this patch.
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next prev parent reply other threads:[~2008-10-02 16:29 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-01 12:30 [PATCH 0/4] Reclaim page capture v4 Andy Whitcroft
2008-10-01 12:30 ` [PATCH 1/4] pull out the page pre-release and sanity check logic for reuse Andy Whitcroft
2008-10-02 7:05 ` KAMEZAWA Hiroyuki
2008-10-01 12:30 ` [PATCH 2/4] pull out zone cpuset and watermark checks " Andy Whitcroft
2008-10-02 7:05 ` KAMEZAWA Hiroyuki
2008-10-01 12:31 ` [PATCH 3/4] buddy: explicitly identify buddy field use in struct page Andy Whitcroft
2008-10-02 7:06 ` KAMEZAWA Hiroyuki
2008-10-01 12:31 ` [PATCH 4/4] capture pages freed during direct reclaim for allocation by the reclaimer Andy Whitcroft
2008-10-01 15:01 ` Christoph Lameter
2008-10-02 14:35 ` Andy Whitcroft
2008-10-02 16:29 ` Christoph Lameter [this message]
2008-10-03 3:41 ` KOSAKI Motohiro
2008-10-03 12:37 ` Christoph Lameter
2008-10-02 7:24 ` KAMEZAWA Hiroyuki
2008-10-02 15:02 ` Andy Whitcroft
2008-10-02 15:25 ` kamezawa.hiroyu
2008-10-02 2:46 ` [PATCH 0/4] Reclaim page capture v4 MinChan Kim
2008-10-02 15:04 ` Andy Whitcroft
2008-10-03 3:25 ` KOSAKI Motohiro
2008-10-03 6:48 ` KOSAKI Motohiro
2008-10-07 4:29 ` MinChan Kim
2008-10-02 6:44 ` KAMEZAWA Hiroyuki
-- strict thread matches above, loose matches on Subject: below --
2008-09-05 10:19 [PATCH 0/4] Reclaim page capture v3 Andy Whitcroft
2008-09-05 10:20 ` [PATCH 4/4] capture pages freed during direct reclaim for allocation by the reclaimer Andy Whitcroft
2008-09-03 18:44 [RFC PATCH 0/4] Reclaim page capture v2 Andy Whitcroft
2008-09-03 18:44 ` [PATCH 4/4] capture pages freed during direct reclaim for allocation by the reclaimer Andy Whitcroft
2008-09-03 20:35 ` Christoph Lameter
2008-09-03 20:53 ` Andy Whitcroft
2008-09-03 21:00 ` Christoph Lameter
2008-09-04 6:38 ` Peter Zijlstra
2008-09-04 14:18 ` Christoph Lameter
2008-09-04 8:11 ` KOSAKI Motohiro
2008-09-04 8:58 ` Andy Whitcroft
2008-09-04 7:20 ` Peter Zijlstra
2008-09-04 11:35 ` Andy Whitcroft
2008-09-04 7:59 ` KOSAKI Motohiro
2008-09-04 14:44 ` Andy Whitcroft
2008-09-05 1:52 ` KOSAKI Motohiro
2008-07-01 17:58 [RFC PATCH 0/4] Reclaim page capture v1 Andy Whitcroft
2008-07-01 17:58 ` [PATCH 4/4] capture pages freed during direct reclaim for allocation by the reclaimer Andy Whitcroft
2008-07-02 12:01 ` KOSAKI Motohiro
2008-07-02 14:44 ` Andy Whitcroft
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