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Subject[PATCHv6 22/22] ramfs: enable transparent huge page cache
Date
ramfs is the most simple fs from page cache point of view. Let's start
transparent huge page cache enabling here.

ramfs pages are not movable[1] and switching to transhuge pages doesn't
affect that. We need to fix this eventually.

[1] http://lkml.org/lkml/2013/4/2/720

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/ramfs/file-mmu.c | 2 +-
fs/ramfs/inode.c | 6 +++++-
2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/ramfs/file-mmu.c b/fs/ramfs/file-mmu.c
index 4884ac5ae9..ae787bf9ba 100644
--- a/fs/ramfs/file-mmu.c
+++ b/fs/ramfs/file-mmu.c
@@ -32,7 +32,7 @@

const struct address_space_operations ramfs_aops = {
.readpage = simple_readpage,
- .write_begin = simple_write_begin,
+ .write_begin = simple_thp_write_begin,
.write_end = simple_write_end,
.set_page_dirty = __set_page_dirty_no_writeback,
};
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index 39d14659a8..5dafdfcd86 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: make ramfs pages movable
+ */
+ 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) {
--
1.8.4.rc3


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