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Subject[PATCH 23/23] ramfs: enable transparent huge page cache
Date
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>

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 | 3 ++-
fs/ramfs/inode.c | 6 +++++-
2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/ramfs/file-mmu.c b/fs/ramfs/file-mmu.c
index 4884ac5..3236e41 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,
};
@@ -47,6 +47,7 @@ const struct file_operations ramfs_file_operations = {
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,
.llseek = generic_file_llseek,
+ .release = simple_thp_release,
};

const struct inode_operations ramfs_file_inode_operations = {
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index 39d1465..5dafdfc 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) {
--
1.8.3.2


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