From: Rik van Riel <riel@redhat.com>
To: lwoodman@redhat.com
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, Christoph Lameter <cl@linux.com>,
Motohiro Kosaki <mkosaki@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH -mm V3] do_migrate_pages() calls migrate_to_node() even if task is already on a correct node
Date: Thu, 26 Apr 2012 14:15:53 -0400 [thread overview]
Message-ID: <4F9990D9.10300@redhat.com> (raw)
In-Reply-To: <4F998FDE.5020104@redhat.com>
On 04/26/2012 02:11 PM, Larry Woodman wrote:
> This patch changes do_migrate_pages() to only preserve the relative
> layout inside the
> program if the number of NUMA nodes in the source and destination mask
> are the
> same. If the number is different, we do a much more efficient migration
> by not touching
> memory that is in an allowed node.
>
> This preserves the old behaviour for programs that want it, while
> allowing a userspace
> NUMA placement tool to use the new, faster migration. This improves
> performance in
> our tests by up to a factor of 7.
> Signed-off-by: Larry Woodman<lwoodman@redhat.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
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WARNING: multiple messages have this Message-ID (diff)
From: Rik van Riel <riel@redhat.com>
To: lwoodman@redhat.com
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, Christoph Lameter <cl@linux.com>,
Motohiro Kosaki <mkosaki@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH -mm V3] do_migrate_pages() calls migrate_to_node() even if task is already on a correct node
Date: Thu, 26 Apr 2012 14:15:53 -0400 [thread overview]
Message-ID: <4F9990D9.10300@redhat.com> (raw)
In-Reply-To: <4F998FDE.5020104@redhat.com>
On 04/26/2012 02:11 PM, Larry Woodman wrote:
> This patch changes do_migrate_pages() to only preserve the relative
> layout inside the
> program if the number of NUMA nodes in the source and destination mask
> are the
> same. If the number is different, we do a much more efficient migration
> by not touching
> memory that is in an allowed node.
>
> This preserves the old behaviour for programs that want it, while
> allowing a userspace
> NUMA placement tool to use the new, faster migration. This improves
> performance in
> our tests by up to a factor of 7.
> Signed-off-by: Larry Woodman<lwoodman@redhat.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
next prev parent reply other threads:[~2012-04-26 18:15 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-26 18:11 [PATCH -mm V3] do_migrate_pages() calls migrate_to_node() even if task is already on a correct node Larry Woodman
2012-04-26 18:11 ` Larry Woodman
2012-04-26 18:15 ` Rik van Riel [this message]
2012-04-26 18:15 ` Rik van Riel
2012-04-27 1:14 ` KOSAKI Motohiro
2012-04-27 1:14 ` KOSAKI Motohiro
2012-04-27 23:09 ` Andrew Morton
2012-04-27 23:09 ` Andrew Morton
2012-04-28 13:05 ` KOSAKI Motohiro
2012-04-28 13:05 ` KOSAKI Motohiro
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