linux-kernel - Re: [PATCH -mm] vmscan: bail out of page reclaim after swap_cluster

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Message-ID: <492AFE04.10404@redhat.com>
Date:	Mon, 24 Nov 2008 14:18:28 -0500
From:	Rik van Riel <riel@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH -mm] vmscan: bail out of page reclaim after swap_cluster_max
 pages

KOSAKI Motohiro wrote:

> 1. reclaim 32 page from ZONE_HIGHMEM
> 2. reclaim 32 page from ZONE_NORMAL
> 3. reclaim 32 page from ZONE_DMA
> 4. exit reclaim
> 5. another task call page alloc and it cause try_to_free_pages()
> 6. reclaim 32 page from ZONE_HIGHMEM
> 7. reclaim 32 page from ZONE_NORMAL
> 8. reclaim 32 page from ZONE_DMA

>> - have direct reclaim tasks continue when priority == DEF_PRIORITY
> 
> disagreed.
> it cause above bad scenario, I think.

I think I did not explain it clearly.  Let me illustrate
with a new patch.  (one moment :))

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