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From: Rik van Riel <riel@redhat.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH -mm] vmscan: bail out of page reclaim after swap_cluster_max pages
Date: Mon, 24 Nov 2008 14:18:28 -0500	[thread overview]
Message-ID: <492AFE04.10404@redhat.com> (raw)
In-Reply-To: <2f11576a0811241112p494b28a6p720da1d60ac3438c@mail.gmail.com>

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 :))

-- 
All rights reversed.

WARNING: multiple messages have this Message-ID (diff)
From: Rik van Riel <riel@redhat.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH -mm] vmscan: bail out of page reclaim after swap_cluster_max pages
Date: Mon, 24 Nov 2008 14:18:28 -0500	[thread overview]
Message-ID: <492AFE04.10404@redhat.com> (raw)
In-Reply-To: <2f11576a0811241112p494b28a6p720da1d60ac3438c@mail.gmail.com>

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 :))

-- 
All rights reversed.

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  reply	other threads:[~2008-11-24 19:18 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-13 22:12 [PATCH -mm] vmscan: bail out of page reclaim after swap_cluster_max pages Rik van Riel
2008-11-13 22:12 ` Rik van Riel
2008-11-14  0:51 ` KOSAKI Motohiro
2008-11-14  0:51   ` KOSAKI Motohiro
2008-11-14  3:27 ` Andrew Morton
2008-11-14  3:27   ` Andrew Morton
2008-11-14 14:36   ` Rik van Riel
2008-11-14 14:36     ` Rik van Riel
2008-11-14 17:18     ` Andrew Morton
2008-11-14 17:18       ` Andrew Morton
2008-11-16  7:43       ` KOSAKI Motohiro
2008-11-16  7:43         ` KOSAKI Motohiro
2008-11-16  7:54         ` Andrew Morton
2008-11-16  7:54           ` Andrew Morton
2008-11-16  7:56           ` KOSAKI Motohiro
2008-11-16  7:56             ` KOSAKI Motohiro
2008-11-16  8:02             ` Andrew Morton
2008-11-16  8:02               ` Andrew Morton
2008-11-22 10:22           ` KOSAKI Motohiro
2008-11-22 10:22             ` KOSAKI Motohiro
2008-11-22 16:57             ` Rik van Riel
2008-11-22 16:57               ` Rik van Riel
2008-11-24 19:12               ` KOSAKI Motohiro
2008-11-24 19:12                 ` KOSAKI Motohiro
2008-11-24 19:18                 ` Rik van Riel [this message]
2008-11-24 19:18                   ` Rik van Riel
2008-11-16  7:38 ` KOSAKI Motohiro
2008-11-16  7:38   ` KOSAKI Motohiro
2008-11-17  0:38   ` KAMEZAWA Hiroyuki
2008-11-17  0:38     ` KAMEZAWA Hiroyuki
2008-11-17  3:43     ` Balbir Singh
2008-11-17  3:43       ` Balbir Singh
2008-11-19 16:54 ` Mel Gorman
2008-11-19 16:54   ` Mel Gorman
2008-11-21 11:59   ` Petr Tesarik
2008-11-21 11:59     ` Petr Tesarik

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