linux-kernel - [PATCH 27/36] autonuma: add CONFIG_AUTONUMA and CONFIG_AUTONUMA_DEFAULT

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Date:	Wed, 22 Aug 2012 16:59:11 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Alex Shi <alex.shi@...el.com>,
	Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Don Morris <don.morris@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [PATCH 27/36] autonuma: add CONFIG_AUTONUMA and CONFIG_AUTONUMA_DEFAULT_ENABLED

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.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 arch/Kconfig     |    3 +++
 arch/x86/Kconfig |    1 +
 mm/Kconfig       |   17 +++++++++++++++++
 3 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 72f2fa1..ee3ed89 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -281,4 +281,7 @@ config SECCOMP_FILTER
 
 	  See Documentation/prctl/seccomp_filter.txt for details.
 
+config HAVE_ARCH_AUTONUMA
+	bool
+
 source "kernel/gcov/Kconfig"
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8ec3a1a..4cbdfce 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -97,6 +97,7 @@ config X86
 	select KTIME_SCALAR if X86_32
 	select GENERIC_STRNCPY_FROM_USER
 	select GENERIC_STRNLEN_USER
+	select HAVE_ARCH_AUTONUMA
 
 config INSTRUCTION_DECODER
 	def_bool (KPROBES || PERF_EVENTS || UPROBES)
diff --git a/mm/Kconfig b/mm/Kconfig
index d5c8019..f00a0cd 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -211,6 +211,23 @@ config MIGRATION
 	  pages as migration can relocate pages to satisfy a huge page
 	  allocation instead of reclaiming.
 
+config AUTONUMA
+	bool "AutoNUMA"
+	select MIGRATION
+	depends on NUMA && HAVE_ARCH_AUTONUMA
+	help
+	  Automatic NUMA CPU scheduling and memory migration.
+
+	  Avoids the administrator to manually setup hard NUMA
+	  bindings in order to achieve optimal performance on NUMA
+	  hardware.
+
+config AUTONUMA_DEFAULT_ENABLED
+	bool "Auto NUMA default enabled"
+	depends on AUTONUMA
+	help
+	  Automatic NUMA CPU scheduling and memory migration enabled at boot.
+
 config PHYS_ADDR_T_64BIT
 	def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT
 
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