linux-kernel - [PATCH 15 of 66] config_transparent

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Message-Id: <32991335ab1810031789.1288798070@v2.random>
Date:	Wed, 03 Nov 2010 16:27:50 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Marcelo Tosatti <mtosatti@...hat.com>, Adam Litke <agl@...ibm.com>,
	Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: [PATCH 15 of 66] config_transparent_hugepage

From: Andrea Arcangeli <aarcange@...hat.com>

Add config option.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
Acked-by: Rik van Riel <riel@...hat.com>
Acked-by: Mel Gorman <mel@....ul.ie>
---

diff --git a/fs/Kconfig b/fs/Kconfig
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -147,7 +147,7 @@ config HUGETLBFS
 	  If unsure, say N.
 
 config HUGETLB_PAGE
-	def_bool HUGETLBFS
+	def_bool HUGETLBFS || TRANSPARENT_HUGEPAGE
 
 source "fs/configfs/Kconfig"
 
diff --git a/mm/Kconfig b/mm/Kconfig
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -302,6 +302,20 @@ config NOMMU_INITIAL_TRIM_EXCESS
 
 	  See Documentation/nommu-mmap.txt for more information.
 
+config TRANSPARENT_HUGEPAGE
+	bool "Transparent Hugepage Support" if EMBEDDED
+	depends on X86_64 && MMU
+	default y
+	help
+	  Transparent Hugepages allows the kernel to use huge pages and
+	  huge tlb transparently to the applications whenever possible.
+	  This feature can improve computing performance to certain
+	  applications by speeding up page faults during memory
+	  allocation, by reducing the number of tlb misses and by speeding
+	  up the pagetable walking.
+
+	  If memory constrained on embedded, you may want to say N.
+
 #
 # UP and nommu archs use km based percpu allocator
 #
--
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