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authorEric Sandeen <sandeen@redhat.com>2010-08-05 01:46:37 -0400
committerTheodore Ts'o <tytso@mit.edu>2010-08-05 01:46:37 -0400
commit0cfc9255a1efb0467de2162950197750570ecec0 (patch)
tree3bb2510d8b6d373d7db3a49bcda3cbbebd10330e /fs/ext4/namei.c
parent8dd420466c7bfc459fa04680bd5690bfc41a4553 (diff)
downloadlinux-0cfc9255a1efb0467de2162950197750570ecec0.tar.bz2
ext4: re-inline ext4_rec_len_(to|from)_disk functions
commit 3d0518f4, "ext4: New rec_len encoding for very large blocksizes" made several changes to this path, but from a perf perspective, un-inlining ext4_rec_len_from_disk() seems most significant. This function is called from ext4_check_dir_entry(), which on a file-creation workload is called extremely often. I tested this with bonnie: # bonnie++ -u root -s 0 -f -x 200 -d /mnt/test -n 32 (this does 200 iterations) and got this for the file creations: ext4 stock: Average = 21206.8 files/s ext4 inlined: Average = 22346.7 files/s (+5%) Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/namei.c')
-rw-r--r--fs/ext4/namei.c24
1 files changed, 0 insertions, 24 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index ea8b59d96213..314c0d3b3fa9 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -179,30 +179,6 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
struct inode *inode);
-unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
-{
- unsigned len = le16_to_cpu(dlen);
-
- if (len == EXT4_MAX_REC_LEN || len == 0)
- return blocksize;
- return (len & 65532) | ((len & 3) << 16);
-}
-
-__le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
-{
- if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
- BUG();
- if (len < 65536)
- return cpu_to_le16(len);
- if (len == blocksize) {
- if (blocksize == 65536)
- return cpu_to_le16(EXT4_MAX_REC_LEN);
- else
- return cpu_to_le16(0);
- }
- return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
-}
-
/*
* p is at least 6 bytes before the end of page
*/