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From: Rik van Riel <riel@redhat.com>
To: Satoru Moriya <satoru.moriya@hds.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"lwoodman@redhat.com" <lwoodman@redhat.com>,
	"jweiner@redhat.com" <jweiner@redhat.com>,
	"shaohua.li@intel.com" <shaohua.li@intel.com>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	"dle-develop@lists.sourceforge.net" 
	<dle-develop@lists.sourceforge.net>,
	Seiji Aguchi <seiji.aguchi@hds.com>
Subject: Re: [RFC][PATCH] avoid swapping out with swappiness==0
Date: Mon, 05 Mar 2012 08:49:20 -0500	[thread overview]
Message-ID: <4F54C460.2030405@redhat.com> (raw)
In-Reply-To: <65795E11DBF1E645A09CEC7EAEE94B9CB9455FE2@USINDEVS02.corp.hds.com>

On 03/02/2012 12:36 PM, Satoru Moriya wrote:
> Sometimes we'd like to avoid swapping out anonymous memory
> in particular, avoid swapping out pages of important process or
> process groups while there is a reasonable amount of pagecache
> on RAM so that we can satisfy our customers' requirements.
>
> OTOH, we can control how aggressive the kernel will swap memory pages
> with /proc/sys/vm/swappiness for global and
> /sys/fs/cgroup/memory/memory.swappiness for each memcg.
>
> But with current reclaim implementation, the kernel may swap out
> even if we set swappiness==0 and there is pagecache on RAM.
>
> This patch changes the behavior with swappiness==0. If we set
> swappiness==0, the kernel does not swap out completely
> (for global reclaim until the amount of free pages and filebacked
> pages in a zone has been reduced to something very very small
> (nr_free + nr_filebacked<  high watermark)).
>
> Any comments are welcome.

My mind is now rested by doing a nice 10 mile hike :)

> Signed-off-by: Satoru Moriya<satoru.moriya@hds.com>

Reviewed-by: Rik van Riel <riel@redhat.com>

-- 
All rights reversed

WARNING: multiple messages have this Message-ID (diff)
From: Rik van Riel <riel@redhat.com>
To: Satoru Moriya <satoru.moriya@hds.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"lwoodman@redhat.com" <lwoodman@redhat.com>,
	"jweiner@redhat.com" <jweiner@redhat.com>,
	"shaohua.li@intel.com" <shaohua.li@intel.com>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	"dle-develop@lists.sourceforge.net"
	<dle-develop@lists.sourceforge.net>,
	Seiji Aguchi <seiji.aguchi@hds.com>
Subject: Re: [RFC][PATCH] avoid swapping out with swappiness==0
Date: Mon, 05 Mar 2012 08:49:20 -0500	[thread overview]
Message-ID: <4F54C460.2030405@redhat.com> (raw)
In-Reply-To: <65795E11DBF1E645A09CEC7EAEE94B9CB9455FE2@USINDEVS02.corp.hds.com>

On 03/02/2012 12:36 PM, Satoru Moriya wrote:
> Sometimes we'd like to avoid swapping out anonymous memory
> in particular, avoid swapping out pages of important process or
> process groups while there is a reasonable amount of pagecache
> on RAM so that we can satisfy our customers' requirements.
>
> OTOH, we can control how aggressive the kernel will swap memory pages
> with /proc/sys/vm/swappiness for global and
> /sys/fs/cgroup/memory/memory.swappiness for each memcg.
>
> But with current reclaim implementation, the kernel may swap out
> even if we set swappiness==0 and there is pagecache on RAM.
>
> This patch changes the behavior with swappiness==0. If we set
> swappiness==0, the kernel does not swap out completely
> (for global reclaim until the amount of free pages and filebacked
> pages in a zone has been reduced to something very very small
> (nr_free + nr_filebacked<  high watermark)).
>
> Any comments are welcome.

My mind is now rested by doing a nice 10 mile hike :)

> Signed-off-by: Satoru Moriya<satoru.moriya@hds.com>

Reviewed-by: Rik van Riel <riel@redhat.com>

-- 
All rights reversed

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  parent reply	other threads:[~2012-03-05 13:50 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-02 17:36 [RFC][PATCH] avoid swapping out with swappiness==0 Satoru Moriya
2012-03-02 17:36 ` Satoru Moriya
2012-03-02 22:47 ` Rik van Riel
2012-03-02 22:47   ` Rik van Riel
2012-03-02 23:43   ` Satoru Moriya
2012-03-02 23:43     ` Satoru Moriya
2012-03-03  2:29   ` Hillf Danton
2012-03-03  2:29     ` Hillf Danton
2012-03-04  6:57 ` Minchan Kim
2012-03-04  6:57   ` Minchan Kim
2012-03-05 21:38   ` Satoru Moriya
2012-03-05 21:38     ` Satoru Moriya
2012-03-05 13:49 ` Rik van Riel [this message]
2012-03-05 13:49   ` Rik van Riel
2012-03-05 21:56 ` Johannes Weiner
2012-03-05 21:56   ` Johannes Weiner
2012-03-07 17:19   ` KOSAKI Motohiro
2012-03-07 17:19     ` KOSAKI Motohiro
2012-03-07 18:18     ` Satoru Moriya
2012-03-07 18:18       ` Satoru Moriya
2012-03-30 22:44       ` Satoru Moriya
2012-03-30 22:44         ` Satoru Moriya
2012-04-02 17:10         ` KOSAKI Motohiro
2012-04-02 17:10           ` KOSAKI Motohiro
2012-04-03 11:25           ` Jerome Marchand
2012-04-03 11:25             ` Jerome Marchand
2012-04-03 15:15             ` Satoru Moriya
2012-04-03 15:15               ` Satoru Moriya
2012-04-04 17:38             ` KOSAKI Motohiro
2012-04-04 17:38               ` KOSAKI Motohiro
2012-04-21  0:21               ` Satoru Moriya
2012-04-21  0:21                 ` Satoru Moriya
2012-05-11 21:11                 ` Satoru Moriya
2012-05-11 21:11                   ` Satoru Moriya
2012-05-12 22:21                   ` Rik van Riel
2012-05-12 22:21                     ` Rik van Riel
2012-04-24  8:20       ` Richard Davies
2012-04-24  8:20         ` Richard Davies
2012-04-24 22:14         ` Satoru Moriya
2012-04-24 22:14           ` Satoru Moriya
2012-04-26 14:26           ` Richard Davies
2012-04-26 14:26             ` Richard Davies
2012-04-26 15:41             ` KOSAKI Motohiro
2012-04-26 15:41               ` KOSAKI Motohiro
2012-05-07 20:09               ` Rik van Riel
2012-05-07 20:09                 ` Rik van Riel
2012-05-08  0:05                 ` Minchan Kim
2012-05-08  0:05                   ` Minchan Kim
2012-05-21  7:12                 ` Richard Davies
2012-05-21  7:12                   ` Richard Davies
2012-05-21 13:39                   ` Satoru Moriya
2012-05-21 13:39                     ` Satoru Moriya
2012-04-26 14:50         ` Christoph Lameter
2012-04-26 14:50           ` Christoph Lameter
2012-04-26 15:37           ` KOSAKI Motohiro
2012-04-26 15:37             ` KOSAKI Motohiro
2012-04-26 16:08             ` Richard Davies
2012-04-26 16:08               ` Richard Davies
2012-04-26 18:20             ` Christoph Lameter
2012-04-26 18:20               ` Christoph Lameter
2012-04-27 13:55           ` Rik van Riel
2012-04-27 13:55             ` Rik van Riel
2012-05-07 20:11 ` Rik van Riel
2012-05-07 20:11   ` Rik van Riel

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