From: Mel Gorman <mel@csn.ul.ie>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: 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>,
Mel Gorman <mel@csn.ul.ie>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH 02/12] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove
Date: Fri, 12 Feb 2010 12:00:49 +0000 [thread overview]
Message-ID: <1265976059-7459-3-git-send-email-mel@csn.ul.ie> (raw)
In-Reply-To: <1265976059-7459-1-git-send-email-mel@csn.ul.ie>
CONFIG_MIGRATION currently depends on CONFIG_NUMA or on the architecture
being able to hot-remove memory. The main users of page migration such as
sys_move_pages(), sys_migrate_pages() and cpuset process migration are
only beneficial on NUMA so it makes sense.
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.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
---
mm/Kconfig | 20 ++++++++++++++++----
1 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/mm/Kconfig b/mm/Kconfig
index 17b8947..b1c2781 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -168,17 +168,29 @@ config SPLIT_PTLOCK_CPUS
default "4"
#
+# support for memory compaction
+config COMPACTION
+ bool "Allow for memory compaction"
+ def_bool y
+ select MIGRATION
+ depends on EXPERIMENTAL && HUGETLBFS
+ help
+ Allows the compaction of memory for the allocation of huge pages.
+
+#
# support for page migration
#
config MIGRATION
bool "Page migration"
def_bool y
- depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE
+ depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE || COMPACTION
help
Allows the migration of the physical location of pages of processes
- while the virtual addresses are not changed. This is useful for
- example on NUMA systems to put pages nearer to the processors accessing
- the page.
+ while the virtual addresses are not changed. This is useful in
+ two situations. The first is on NUMA systems to put pages nearer
+ to the processors accessing. The second is when allocating huge
+ pages as migration can relocate pages to satisfy a huge page
+ allocation instead of reclaiming.
config PHYS_ADDR_T_64BIT
def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT
--
1.6.5
--
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next prev parent reply other threads:[~2010-02-12 12:01 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-12 12:00 [PATCH 0/12] Memory Compaction v2r12 Mel Gorman
2010-02-12 12:00 ` [PATCH 01/12] mm: Document /proc/pagetypeinfo Mel Gorman
2010-02-12 15:54 ` Christoph Lameter
2010-02-16 7:05 ` KOSAKI Motohiro
2010-02-12 12:00 ` Mel Gorman [this message]
2010-02-16 17:43 ` [PATCH 02/12] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove Rik van Riel
2010-02-12 12:00 ` [PATCH 03/12] Export unusable free space index via /proc/pagetypeinfo Mel Gorman
2010-02-16 7:03 ` KOSAKI Motohiro
2010-02-16 8:36 ` Mel Gorman
2010-02-16 8:41 ` KOSAKI Motohiro
2010-02-16 8:50 ` Mel Gorman
2010-02-16 18:28 ` Rik van Riel
2010-02-18 15:23 ` Minchan Kim
2010-02-18 15:32 ` Mel Gorman
2010-02-12 12:00 ` [PATCH 04/12] Export fragmentation " Mel Gorman
2010-02-16 7:59 ` KOSAKI Motohiro
2010-02-16 8:41 ` Mel Gorman
2010-02-16 8:49 ` KOSAKI Motohiro
2010-02-17 1:44 ` Rik van Riel
2010-02-18 15:37 ` Minchan Kim
2010-02-12 12:00 ` [PATCH 05/12] Memory compaction core Mel Gorman
2010-02-16 8:31 ` KOSAKI Motohiro
2010-02-16 8:48 ` Mel Gorman
2010-02-16 14:55 ` Christoph Lameter
2010-02-16 14:59 ` Mel Gorman
2010-02-18 19:37 ` Christoph Lameter
2010-02-18 21:35 ` Mel Gorman
2010-02-19 0:04 ` KAMEZAWA Hiroyuki
2010-02-17 13:29 ` Mel Gorman
2010-02-17 15:45 ` Rik van Riel
2010-02-18 16:58 ` Minchan Kim
2010-02-18 17:34 ` Mel Gorman
2010-02-19 1:21 ` Minchan Kim
2010-02-19 14:33 ` Mel Gorman
2010-02-12 12:00 ` [PATCH 06/12] Add /proc trigger for memory compaction Mel Gorman
2010-02-12 18:34 ` Valdis.Kletnieks
2010-02-12 18:38 ` Mel Gorman
2010-02-17 16:30 ` Rik van Riel
2010-02-18 19:51 ` Christoph Lameter
2010-02-19 1:56 ` Minchan Kim
2010-02-12 12:00 ` [PATCH 07/12] Add /sys trigger for per-node " Mel Gorman
2010-02-17 16:30 ` Rik van Riel
2010-02-12 12:00 ` [PATCH 08/12] Direct compact when a high-order allocation fails Mel Gorman
2010-02-18 3:57 ` Rik van Riel
2010-02-12 12:00 ` [PATCH 09/12] Do not compact within a preferred zone after a compaction failure Mel Gorman
2010-02-18 4:09 ` Rik van Riel
2010-02-12 12:00 ` [PATCH 10/12] mm: Check for an empty VMA list in rmap_walk_anon Mel Gorman
2010-02-17 18:22 ` Mel Gorman
2010-02-12 12:00 ` [PATCH 11/12] mm: Take the RCU read lock " Mel Gorman
2010-02-12 12:00 ` [PATCH 12/12] mm: Check the anon_vma is still valid in rmap_walk_anon() Mel Gorman
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