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| author | Eric Sandeen <sandeen@redhat.com> | 2010-08-05 01:46:37 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2010-08-05 01:46:37 -0400 |
| commit | 0cfc9255a1efb0467de2162950197750570ecec0 (patch) | |
| tree | 3bb2510d8b6d373d7db3a49bcda3cbbebd10330e /fs/ext4/namei.c | |
| parent | 8dd420466c7bfc459fa04680bd5690bfc41a4553 (diff) | |
| download | lwn-0cfc9255a1efb0467de2162950197750570ecec0.tar.gz lwn-0cfc9255a1efb0467de2162950197750570ecec0.zip | |
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.c | 24 |
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 */ |