linux-kernel - [PATCH, RFC 16/16] ramfs: enable transparent huge page cache

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Date:	Mon, 28 Jan 2013 11:24:28 +0200
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>
Cc:	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH, RFC 16/16] ramfs: enable transparent huge page cache

From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>

ramfs is the most simple fs from page cache point of view. Let's start
transparent huge page cache enabling here.

For now we allocate only non-movable huge page. It's not yet clear if
movable page is safe here and what need to be done to make it safe.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 fs/ramfs/inode.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index eab8c09..591457d 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -61,7 +61,11 @@ struct inode *ramfs_get_inode(struct super_block *sb,
 		inode_init_owner(inode, dir, mode);
 		inode->i_mapping->a_ops = &ramfs_aops;
 		inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info;
-		mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER);
+		/*
+		 * TODO: what should be done to make movable safe?
+		 */
+		mapping_set_gfp_mask(inode->i_mapping,
+				GFP_TRANSHUGE & ~__GFP_MOVABLE);
 		mapping_set_unevictable(inode->i_mapping);
 		inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 		switch (mode & S_IFMT) {
-- 
1.7.10.4

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