From: Mel Gorman <mel@csn.ul.ie>
To: David Rientjes <rientjes@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Christoph Lameter <cl@linux-foundation.org>,
Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 1/7] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA
Date: Tue, 19 Jan 2010 13:00:55 +0000 [thread overview]
Message-ID: <20100119130055.GC23881@csn.ul.ie> (raw)
In-Reply-To: <alpine.DEB.2.00.1001071331520.23894@chino.kir.corp.google.com>
On Thu, Jan 07, 2010 at 01:46:03PM -0800, David Rientjes wrote:
> On Wed, 6 Jan 2010, Mel Gorman wrote:
>
> > CONFIG_MIGRATION currently depends on CONFIG_NUMA. The current users of
> > page migration such as sys_move_pages(), sys_migrate_pages() and cpuset
> > process migration are ordinarily only beneficial on NUMA.
> >
> > As memory compaction will operate within a zone and is useful on both NUMA
> > and non-NUMA systems, this patch allows CONFIG_MIGRATION to be set if the
> > user selects CONFIG_COMPACTION as an option.
> >
> > TODO
> > o After this patch is applied, the migration core is available but it
> > also makes NUMA-specific features available. This is too much
> > exposure so revisit this.
> >
>
> CONFIG_MIGRATION is no longer strictly dependent on CONFIG_NUMA since
> ARCH_ENABLE_MEMORY_HOTREMOVE has allowed it to be configured for UMA
> machines. All strictly NUMA features in the migration core should be
> isolated under its #ifdef CONFIG_NUMA (sys_move_pages()) in mm/migrate.c
> or by simply not compiling mm/mempolicy.c (sys_migrate_pages()), so this
> patch looks fine as is (although the "help" text for CONFIG_MIGRATION
> could be updated to reflect that it's useful for both memory hot-remove
> and now compaction).
>
That does appear to be the case, thanks. I had not double-checked
closely and it was somewhat of a problem when the series was first
developed.
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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next prev parent reply other threads:[~2010-01-19 13:01 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-06 16:26 [RFC-PATCH 0/7] Memory Compaction v1 Mel Gorman
2010-01-06 16:26 ` [PATCH 1/7] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA Mel Gorman
2010-01-07 21:46 ` David Rientjes
2010-01-07 22:04 ` Christoph Lameter
2010-01-19 13:00 ` Mel Gorman [this message]
2010-01-06 16:26 ` [PATCH 2/7] Export unusable free space index via /proc/pagetypeinfo Mel Gorman
2010-01-06 17:10 ` Adam Litke
2010-01-06 17:29 ` Mel Gorman
2010-01-06 23:21 ` Tim Pepper
2010-01-28 22:27 ` David Rientjes
2010-02-05 10:23 ` Mel Gorman
2010-02-05 21:40 ` David Rientjes
2010-02-08 12:10 ` Mel Gorman
2010-01-06 16:26 ` [PATCH 3/7] Export fragmentation " Mel Gorman
2010-01-06 16:26 ` [PATCH 4/7] Memory compaction core Mel Gorman
2010-01-06 17:50 ` Mel Gorman
2010-01-06 18:22 ` Mel Gorman
2010-01-06 21:37 ` Andi Kleen
2010-01-06 22:07 ` Mel Gorman
2010-01-06 16:26 ` [PATCH 5/7] Add /proc trigger for memory compaction Mel Gorman
2010-01-07 22:00 ` David Rientjes
2010-01-13 23:23 ` David Rientjes
2010-01-20 9:48 ` Mel Gorman
2010-01-20 9:48 ` Mel Gorman
2010-01-20 18:12 ` Christoph Lameter
2010-01-20 20:53 ` Mel Gorman
2010-01-20 20:48 ` David Rientjes
2010-01-21 14:09 ` Mel Gorman
2010-01-21 23:34 ` David Rientjes
2010-01-06 16:26 ` [PATCH 6/7] Direct compact when a high-order allocation fails Mel Gorman
2010-01-06 16:26 ` [PATCH 7/7] Do not compact within a preferred zone after a compaction failure Mel Gorman
2010-01-13 23:28 ` David Rientjes
2010-01-20 9:51 ` Mel Gorman
2010-01-21 3:12 ` [RFC-PATCH 0/7] Memory Compaction v1 KOSAKI Motohiro
2010-01-21 10:11 ` Mel Gorman
2010-01-22 0:16 ` KOSAKI Motohiro
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