linux-kernel - [PATCH 1/3] x86: Require x86-64 for automatic NUMA balancing

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Date:	Mon,  7 Apr 2014 16:10:41 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Cyrill Gorcunov <gorcunov@...il.com>, Mel Gorman <mgorman@...e.de>,
	Peter Anvin <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Steven Noonan <steven@...inklabs.net>,
	Rik van Riel <riel@...hat.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Linux-MM <linux-mm@...ck.org>, Linux-X86 <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3] x86: Require x86-64 for automatic NUMA balancing

Automatic NUMA balancing currently depends on reusing the PROT_NONE
bit which has caused problems on Xen. In preparation for using one of
the unused physical address bits this patch requires x86-64 for automatic
NUMA balancing. 32-bit support for NUMA on x86 is no longer interesting
and the loss of automatic NUMA balancing support should be no surprise.

Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 arch/x86/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0af5250..084b1c1 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -26,7 +26,7 @@ config X86
 	select ARCH_MIGHT_HAVE_PC_SERIO
 	select HAVE_AOUT if X86_32
 	select HAVE_UNSTABLE_SCHED_CLOCK
-	select ARCH_SUPPORTS_NUMA_BALANCING
+	select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
 	select ARCH_SUPPORTS_INT128 if X86_64
 	select ARCH_WANTS_PROT_NUMA_PROT_NONE
 	select HAVE_IDE
-- 
1.8.4.5

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