linux-ext4 - [PATCH 07/18] Configuration menu for Huge Page Cache

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Date:	Thu, 16 Feb 2012 15:31:34 +0100
From:	Radosław Smogura <mail@...gura.eu>
To:	linux-mm@...ck.org
Cc:	Yongqiang Yang <xiaoqiangnk@...il.com>, mail@...gura.eu,
	linux-ext4@...r.kernel.org
Subject: [PATCH 07/18] Configuration menu for Huge Page Cache

Just, adds config options for enabling huge page cache and
enabling it in shmfs (tmpfs).

Signed-off-by: Radosław Smogura <mail@...gura.eu>
---
 init/Kconfig |    6 ++++++
 mm/Kconfig   |   11 +++++++++++
 2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index 3f42cd6..a58b622 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1135,6 +1135,12 @@ config SHMEM
 	  option replaces shmem and tmpfs with the much simpler ramfs code,
 	  which may be appropriate on small systems without swap.
 
+config SHMEM_HUGEPAGECACHE
+	bool "Allow usage of transparent huge pages"
+	depends on HUGEPAGECACHE && SHMEM
+	help
+	  This allows usage of huge pages in shmfs (tmpfs)
+
 config AIO
 	bool "Enable AIO support" if EXPERT
 	default y
diff --git a/mm/Kconfig b/mm/Kconfig
index e338407..494122d 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -349,6 +349,17 @@ choice
 	  benefit.
 endchoice
 
+config HUGEPAGECACHE
+	bool "Support for huge pages in page cache"
+	depends on TRANSPARENT_HUGEPAGE
+	select COMPACTION 
+	help
+	  Huge pages in page cache allows to transaprently use huge
+	  pages in file maped regions. This options just exports
+	  required interfaces, You will need to enable support
+	  for Huge Page Cache for particullar filesystems.
+	  Currently only shmfs supports huge pages in page cache.
+
 #
 # UP and nommu archs use km based percpu allocator
 #
-- 
1.7.3.4

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