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From: Mel Gorman <mel@csn.ul.ie>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
	Christoph Lameter <cl@linux-foundation.org>,
	Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>,
	David Rientjes <rientjes@google.com>,
	Minchan Kim <minchan.kim@gmail.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	Rik van Riel <riel@redhat.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 10/14] Add /sys trigger for per-node memory compaction
Date: Wed, 7 Apr 2010 16:42:06 +0100	[thread overview]
Message-ID: <20100407154206.GS17882@csn.ul.ie> (raw)
In-Reply-To: <20100406170559.52093bd5.akpm@linux-foundation.org>

On Tue, Apr 06, 2010 at 05:05:59PM -0700, Andrew Morton wrote:
> On Fri,  2 Apr 2010 17:02:44 +0100
> Mel Gorman <mel@csn.ul.ie> wrote:
> 
> > This patch adds a per-node sysfs file called compact. When the file is
> > written to, each zone in that node is compacted. The intention that this
> > would be used by something like a job scheduler in a batch system before
> > a job starts so that the job can allocate the maximum number of
> > hugepages without significant start-up cost.
> 
> Would it make more sense if this was a per-memcg thing rather than a
> per-node thing?
> 

Kamezawa Hiroyuki covered this perfectly. memcg doesn't care and while
cpuset might, there are a lot more people working with nodes than there
are with cpuset.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab

WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mel@csn.ul.ie>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
	Christoph Lameter <cl@linux-foundation.org>,
	Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>,
	David Rientjes <rientjes@google.com>,
	Minchan Kim <minchan.kim@gmail.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	Rik van Riel <riel@redhat.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 10/14] Add /sys trigger for per-node memory compaction
Date: Wed, 7 Apr 2010 16:42:06 +0100	[thread overview]
Message-ID: <20100407154206.GS17882@csn.ul.ie> (raw)
In-Reply-To: <20100406170559.52093bd5.akpm@linux-foundation.org>

On Tue, Apr 06, 2010 at 05:05:59PM -0700, Andrew Morton wrote:
> On Fri,  2 Apr 2010 17:02:44 +0100
> Mel Gorman <mel@csn.ul.ie> wrote:
> 
> > This patch adds a per-node sysfs file called compact. When the file is
> > written to, each zone in that node is compacted. The intention that this
> > would be used by something like a job scheduler in a batch system before
> > a job starts so that the job can allocate the maximum number of
> > hugepages without significant start-up cost.
> 
> Would it make more sense if this was a per-memcg thing rather than a
> per-node thing?
> 

Kamezawa Hiroyuki covered this perfectly. memcg doesn't care and while
cpuset might, there are a lot more people working with nodes than there
are with cpuset.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab

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  parent reply	other threads:[~2010-04-07 15:42 UTC|newest]

Thread overview: 112+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-04-02 16:02 [PATCH 0/14] Memory Compaction v7 Mel Gorman
2010-04-02 16:02 ` Mel Gorman
2010-04-02 16:02 ` [PATCH 01/14] mm,migration: Take a reference to the anon_vma before migrating Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-07  0:05   ` Andrew Morton
2010-04-07  0:05     ` Andrew Morton
2010-04-07  9:56     ` Mel Gorman
2010-04-07  9:56       ` Mel Gorman
2010-04-02 16:02 ` [PATCH 02/14] mm,migration: Do not try to migrate unmapped anonymous pages Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-02 16:02 ` [PATCH 03/14] mm: Share the anon_vma ref counts between KSM and page migration Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-07  0:05   ` Andrew Morton
2010-04-07  0:05     ` Andrew Morton
2010-04-07  0:10     ` Rik van Riel
2010-04-07  0:10       ` Rik van Riel
2010-04-07 10:01     ` Mel Gorman
2010-04-07 10:01       ` Mel Gorman
2010-04-02 16:02 ` [PATCH 04/14] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-07  0:05   ` Andrew Morton
2010-04-07  0:05     ` Andrew Morton
2010-04-07 10:22     ` Mel Gorman
2010-04-07 10:22       ` Mel Gorman
2010-04-02 16:02 ` [PATCH 05/14] Export unusable free space index via /proc/unusable_index Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-07  0:05   ` Andrew Morton
2010-04-07  0:05     ` Andrew Morton
2010-04-07 10:35     ` Mel Gorman
2010-04-07 10:35       ` Mel Gorman
2010-04-13 12:42     ` Mel Gorman
2010-04-13 12:42       ` Mel Gorman
2010-04-02 16:02 ` [PATCH 06/14] Export fragmentation index via /proc/extfrag_index Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-07  0:05   ` Andrew Morton
2010-04-07  0:05     ` Andrew Morton
2010-04-07 10:46     ` Mel Gorman
2010-04-07 10:46       ` Mel Gorman
2010-04-13 12:43     ` Mel Gorman
2010-04-13 12:43       ` Mel Gorman
2010-04-02 16:02 ` [PATCH 07/14] Move definition for LRU isolation modes to a header Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-02 16:02 ` [PATCH 08/14] Memory compaction core Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-07  0:05   ` Andrew Morton
2010-04-07  0:05     ` Andrew Morton
2010-04-07 15:21     ` Mel Gorman
2010-04-07 15:21       ` Mel Gorman
2010-04-08 16:59   ` Mel Gorman
2010-04-08 16:59     ` Mel Gorman
2010-04-08 17:06     ` Andrea Arcangeli
2010-04-08 17:06       ` Andrea Arcangeli
2010-04-02 16:02 ` [PATCH 09/14] Add /proc trigger for memory compaction Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-07  0:05   ` Andrew Morton
2010-04-07  0:05     ` Andrew Morton
2010-04-07 15:39     ` Mel Gorman
2010-04-07 15:39       ` Mel Gorman
2010-04-07 18:27       ` Mel Gorman
2010-04-07 18:27         ` Mel Gorman
2010-04-02 16:02 ` [PATCH 10/14] Add /sys trigger for per-node " Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-07  0:05   ` Andrew Morton
2010-04-07  0:05     ` Andrew Morton
2010-04-07  0:31     ` KAMEZAWA Hiroyuki
2010-04-07  0:31       ` KAMEZAWA Hiroyuki
2010-04-06 21:56       ` Andrew Morton
2010-04-06 21:56         ` Andrew Morton
2010-04-07  1:19         ` KAMEZAWA Hiroyuki
2010-04-07  1:19           ` KAMEZAWA Hiroyuki
2010-04-07 15:42     ` Mel Gorman [this message]
2010-04-07 15:42       ` Mel Gorman
2010-04-02 16:02 ` [PATCH 11/14] Direct compact when a high-order allocation fails Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-07  0:06   ` Andrew Morton
2010-04-07  0:06     ` Andrew Morton
2010-04-07 16:06     ` Mel Gorman
2010-04-07 16:06       ` Mel Gorman
2010-04-07 18:29     ` Mel Gorman
2010-04-07 18:29       ` Mel Gorman
2010-04-02 16:02 ` [PATCH 12/14] Add a tunable that decides when memory should be compacted and when it should be reclaimed Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-07  0:06   ` Andrew Morton
2010-04-07  0:06     ` Andrew Morton
2010-04-07 16:11     ` Mel Gorman
2010-04-07 16:11       ` Mel Gorman
2010-04-02 16:02 ` [PATCH 13/14] Do not compact within a preferred zone after a compaction failure Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-07  0:06   ` Andrew Morton
2010-04-07  0:06     ` Andrew Morton
2010-04-07  0:55     ` Andrea Arcangeli
2010-04-07  0:55       ` Andrea Arcangeli
2010-04-07 16:32     ` Mel Gorman
2010-04-07 16:32       ` Mel Gorman
2010-04-02 16:02 ` [PATCH 14/14] mm,migration: Allow the migration of PageSwapCache pages Mel Gorman
2010-04-02 16:02   ` Mel Gorman
2010-04-06  6:54   ` KAMEZAWA Hiroyuki
2010-04-06  6:54     ` KAMEZAWA Hiroyuki
2010-04-06 15:37   ` Minchan Kim
2010-04-06 15:37     ` Minchan Kim
2010-04-07  0:06   ` Andrew Morton
2010-04-07  0:06     ` Andrew Morton
2010-04-07 16:49     ` Mel Gorman
2010-04-07 16:49       ` Mel Gorman
2010-04-06 14:47 ` [PATCH 0/14] Memory Compaction v7 Tarkan Erimer
2010-04-06 14:47   ` Tarkan Erimer
2010-04-06 15:00   ` Mel Gorman
2010-04-06 15:00     ` Mel Gorman
2010-04-06 15:03     ` Tarkan Erimer
2010-04-06 15:03       ` Tarkan Erimer
  -- strict thread matches above, loose matches on Subject: below --
2010-03-30  9:14 [PATCH 0/14] Memory Compaction v6 Mel Gorman
2010-03-30  9:14 ` [PATCH 10/14] Add /sys trigger for per-node memory compaction Mel Gorman
2010-03-30  9:14   ` Mel Gorman

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