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From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
To: Christoph Lameter <cl@linux.com>
Cc: Richard Davies <richard@arachsys.com>,
	Satoru Moriya <satoru.moriya@hds.com>,
	KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
	Jerome Marchand <jmarchan@redhat.com>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	"jweiner@redhat.com" <jweiner@redhat.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"riel@redhat.com" <riel@redhat.com>,
	"lwoodman@redhat.com" <lwoodman@redhat.com>,
	"shaohua.li@intel.com" <shaohua.li@intel.com>,
	"dle-develop@lists.sourceforge.net" 
	<dle-develop@lists.sourceforge.net>,
	Seiji Aguchi <seiji.aguchi@hds.com>,
	Minchan Kim <minchan.kim@gmail.com>
Subject: Re: [RFC][PATCH] avoid swapping out with swappiness==0
Date: Thu, 26 Apr 2012 11:37:10 -0400	[thread overview]
Message-ID: <4F996BA6.9010900@gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1204260948520.16059@router.home>

(4/26/12 10:50 AM), Christoph Lameter wrote:
> On Tue, 24 Apr 2012, Richard Davies wrote:
>
>> I strongly believe that Linux should have a way to turn off swapping unless
>> absolutely necessary. This means that users like us can run with swap
>> present for emergency use, rather than having to disable it because of the
>> side effects.
>
> Agree. And this ooperation mode should be the default behavior given that
> swapping is a very slow and tedious process these days.

Even though current patch is not optimal, I don't disagree this opinion. Can
you please explain your use case? Why don't you use swapoff?

Off topic: I hope linux is going to aim good swap clustered io in future. Especially
when using THP, 4k size io is not really good.


WARNING: multiple messages have this Message-ID (diff)
From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
To: Christoph Lameter <cl@linux.com>
Cc: Richard Davies <richard@arachsys.com>,
	Satoru Moriya <satoru.moriya@hds.com>,
	KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
	Jerome Marchand <jmarchan@redhat.com>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	"jweiner@redhat.com" <jweiner@redhat.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"riel@redhat.com" <riel@redhat.com>,
	"lwoodman@redhat.com" <lwoodman@redhat.com>,
	"shaohua.li@intel.com" <shaohua.li@intel.com>,
	"dle-develop@lists.sourceforge.net"
	<dle-develop@lists.sourceforge.net>,
	Seiji Aguchi <seiji.aguchi@hds.com>,
	Minchan Kim <minchan.kim@gmail.com>
Subject: Re: [RFC][PATCH] avoid swapping out with swappiness==0
Date: Thu, 26 Apr 2012 11:37:10 -0400	[thread overview]
Message-ID: <4F996BA6.9010900@gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1204260948520.16059@router.home>

(4/26/12 10:50 AM), Christoph Lameter wrote:
> On Tue, 24 Apr 2012, Richard Davies wrote:
>
>> I strongly believe that Linux should have a way to turn off swapping unless
>> absolutely necessary. This means that users like us can run with swap
>> present for emergency use, rather than having to disable it because of the
>> side effects.
>
> Agree. And this ooperation mode should be the default behavior given that
> swapping is a very slow and tedious process these days.

Even though current patch is not optimal, I don't disagree this opinion. Can
you please explain your use case? Why don't you use swapoff?

Off topic: I hope linux is going to aim good swap clustered io in future. Especially
when using THP, 4k size io is not really good.

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  reply	other threads:[~2012-04-26 15:36 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
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 [this message]
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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