Re: [PATCH 34/40] autonuma: add CONFIG_AUTONUMA and CONFIG_AUTONUMA_DEFAULT_ENABLED

From: Rik van Riel
Date: Mon Jul 02 2012 - 00:59:05 EST


On 06/28/2012 08:56 AM, Andrea Arcangeli wrote:
Add the config options to allow building the kernel with AutoNUMA.

If CONFIG_AUTONUMA_DEFAULT_ENABLED is "=y", then
/sys/kernel/mm/autonuma/enabled will be equal to 1, and AutoNUMA will
be enabled automatically at boot.

CONFIG_AUTONUMA currently depends on X86, because no other arch
implements the pte/pmd_numa yet and selecting =y would result in a
failed build, but this shall be relaxed in the future. Porting
AutoNUMA to other archs should be pretty simple.

Signed-off-by: Andrea Arcangeli<aarcange@xxxxxxxxxx>

The Makefile changes could be merged into this patch

diff --git a/mm/Kconfig b/mm/Kconfig
index 82fed4e..330dd51 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -207,6 +207,19 @@ config MIGRATION
pages as migration can relocate pages to satisfy a huge page
allocation instead of reclaiming.

+config AUTONUMA
+ bool "Auto NUMA"
+ select MIGRATION
+ depends on NUMA&& X86

How about having the x86 architecture export a
HAVE_AUTONUMA flag, and testing for that?

+ help
+ Automatic NUMA CPU scheduling and memory migration.

This could be expanded to list advantages and
disadvantages of having autonuma enabled.

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