From: Mel Gorman <mel@csn.ul.ie>
To: Greg KH <greg@kroah.com>
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>,
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 10/12] Add /sys trigger for per-node memory compaction
Date: Fri, 19 Feb 2010 15:52:13 +0000 [thread overview]
Message-ID: <20100219155213.GD1445@csn.ul.ie> (raw)
In-Reply-To: <20100219155117.GC1445@csn.ul.ie>
On Fri, Feb 19, 2010 at 03:51:17PM +0000, Mel Gorman wrote:
> On Fri, Feb 19, 2010 at 07:31:42AM -0800, Greg KH wrote:
> > On Fri, Feb 19, 2010 at 03:28:30PM +0000, Mel Gorman wrote:
> > > On Fri, Feb 19, 2010 at 06:53:59AM -0800, Greg KH wrote:
> > > > On Thu, Feb 18, 2010 at 06:02:40PM +0000, Mel Gorman 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.
> > > >
> > > > As you are adding sysfs files, can you please also add documentation for
> > > > the file in Documentation/ABI/ ?
> > > >
> > >
> > > I looked at this before and hit a wall and then forgot about it. I couldn't
> > > find *where* I should document it at the time. There isn't a sysfs-devices-node
> > > file to add to and much (all?) of what is in that branch appears undocumented.
> >
> > Well, you can always just document what you add, or you can document the
> > existing stuff as well. It's your choice :)
> >
>
> Fair point!
>
> I've taken note to document what's in there over time. For the moment,
> is this a reasonable start? I'll split it into two patches but the end
> result will be the same.
>
Bah, as I hit send, I recognised my folly. The first entry should be in
stable/ and the second should be in testing/.
> diff --git a/Documentation/ABI/testing/sysfs-devices-node b/Documentation/ABI/testing/sysfs-devices-node
> new file mode 100644
> index 0000000..1ee348b
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-devices-node
> @@ -0,0 +1,15 @@
> +What: /sys/devices/system/node/nodeX
> +Date: October 2002
> +Contact: Linux Memory Management list <linux-mm@kvack.org>
> +Description:
> + When CONFIG_NUMA is enabled, this is a directory containing
> + information on node X such as what CPUs are local to the
> + node.
> +
> +What: /sys/devices/system/node/nodeX/compact
> +Date: February 2010
> +Contact: Mel Gorman <mel@csn.ul.ie>
> +Description:
> + When this file is written to, all memory within that node
> + will be compacted. When it completes, memory will be free
> + in as contiguous blocks as possible.
>
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
>
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
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Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2010-02-19 15:52 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-18 18:02 [PATCH 0/12] Memory Compaction v3 Mel Gorman
2010-02-18 18:02 ` [PATCH 01/12] mm,migration: Take a reference to the anon_vma before migrating Mel Gorman
2010-02-19 0:12 ` KAMEZAWA Hiroyuki
2010-02-19 13:59 ` Mel Gorman
2010-02-19 16:43 ` Rik van Riel
2010-02-18 18:02 ` [PATCH 02/12] mm,migration: Do not try to migrate unmapped anonymous pages Mel Gorman
2010-02-19 16:45 ` Rik van Riel
2010-02-18 18:02 ` [PATCH 03/12] mm: Share the anon_vma ref counts between KSM and page migration Mel Gorman
2010-02-19 0:18 ` KAMEZAWA Hiroyuki
2010-02-19 14:05 ` Mel Gorman
2010-02-19 15:01 ` Christoph Lameter
2010-02-20 3:48 ` KAMEZAWA Hiroyuki
2010-02-20 9:32 ` Mel Gorman
2010-02-19 5:09 ` Minchan Kim
2010-02-19 21:42 ` Rik van Riel
2010-02-19 21:58 ` Mel Gorman
2010-02-20 0:16 ` Rik van Riel
2010-02-20 9:29 ` Mel Gorman
2010-02-18 18:02 ` [PATCH 04/12] mm: Document /proc/pagetypeinfo Mel Gorman
2010-02-19 1:36 ` Minchan Kim
2010-02-19 21:42 ` Rik van Riel
2010-02-18 18:02 ` [PATCH 05/12] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove Mel Gorman
2010-02-19 0:21 ` KAMEZAWA Hiroyuki
2010-02-19 14:09 ` Mel Gorman
2010-02-18 18:02 ` [PATCH 06/12] Export unusable free space index via /proc/pagetypeinfo Mel Gorman
2010-02-19 1:35 ` Minchan Kim
2010-02-19 21:46 ` Rik van Riel
2010-02-18 18:02 ` [PATCH 07/12] Export fragmentation " Mel Gorman
2010-02-19 1:59 ` Minchan Kim
2010-02-20 0:16 ` Rik van Riel
2010-02-18 18:02 ` [PATCH 08/12] Memory compaction core Mel Gorman
2010-02-19 0:37 ` KAMEZAWA Hiroyuki
2010-02-19 14:15 ` Mel Gorman
2010-02-18 18:02 ` [PATCH 09/12] Add /proc trigger for memory compaction Mel Gorman
2010-02-19 0:43 ` KAMEZAWA Hiroyuki
2010-02-19 14:16 ` Mel Gorman
2010-02-20 3:53 ` KAMEZAWA Hiroyuki
2010-02-19 2:26 ` Minchan Kim
2010-02-18 18:02 ` [PATCH 10/12] Add /sys trigger for per-node " Mel Gorman
2010-02-19 14:53 ` Greg KH
2010-02-19 15:28 ` Mel Gorman
2010-02-19 15:31 ` Greg KH
2010-02-19 15:51 ` Mel Gorman
2010-02-19 15:52 ` Mel Gorman [this message]
2010-02-19 16:02 ` Greg KH
2010-02-18 18:02 ` [PATCH 11/12] Direct compact when a high-order allocation fails Mel Gorman
2010-02-19 0:51 ` KAMEZAWA Hiroyuki
2010-02-19 14:19 ` Mel Gorman
2010-02-19 2:41 ` Minchan Kim
2010-02-19 14:25 ` Mel Gorman
2010-02-18 18:02 ` [PATCH 12/12] Do not compact within a preferred zone after a compaction failure Mel Gorman
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