linux-kernel - [PATCH 14/27] sched, numa, mm, arch: Add variable locality exception

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Message-Id: <1353291284-2998-15-git-send-email-mingo@kernel.org>
Date:	Mon, 19 Nov 2012 03:14:31 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Turner <pjt@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>
Subject: [PATCH 14/27] sched, numa, mm, arch: Add variable locality exception

From: Peter Zijlstra <a.p.zijlstra@...llo.nl>

Some architectures (ab)use NUMA to represent different memory
regions all cpu-local but of different latencies, such as SuperH.

The naming comes from Mel Gorman.

Named-by: Mel Gorman <mgorman@...e.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Hugh Dickins <hughd@...gle.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/sh/mm/Kconfig | 1 +
 init/Kconfig       | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index cb8f992..5d2a4df 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -111,6 +111,7 @@ config VSYSCALL
 config NUMA
 	bool "Non Uniform Memory Access (NUMA) Support"
 	depends on MMU && SYS_SUPPORTS_NUMA && EXPERIMENTAL
+	select ARCH_WANTS_NUMA_VARIABLE_LOCALITY
 	default n
 	help
 	  Some SH systems have many various memories scattered around
diff --git a/init/Kconfig b/init/Kconfig
index f36c83d..b8a4a58 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -718,6 +718,13 @@ config ARCH_USES_NUMA_GENERIC_PGPROT_HUGEPAGE
 	depends on ARCH_USES_NUMA_GENERIC_PGPROT
 	depends on TRANSPARENT_HUGEPAGE
 
+#
+# For architectures that (ab)use NUMA to represent different memory regions
+# all cpu-local but of different latencies, such as SuperH.
+#
+config ARCH_WANTS_NUMA_VARIABLE_LOCALITY
+	bool
+
 menuconfig CGROUPS
 	boolean "Control Group support"
 	depends on EVENTFD
-- 
1.7.11.7

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