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| author | Vivek Haldar <haldar@google.com> | 2011-05-22 21:24:16 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2011-05-22 21:24:16 -0400 |
| commit | 77f4135f2a219a2127be6cc1208c42e6175b11dd (patch) | |
| tree | 8f85549d2354c5a69a5b29197f68a554daad1324 /fs/ext4/extents.c | |
| parent | 93917411be8db5d21abf15c781dfa43c5cc6edf2 (diff) | |
| download | kernel_samsung_smdk4412-77f4135f2a219a2127be6cc1208c42e6175b11dd.zip kernel_samsung_smdk4412-77f4135f2a219a2127be6cc1208c42e6175b11dd.tar.gz kernel_samsung_smdk4412-77f4135f2a219a2127be6cc1208c42e6175b11dd.tar.bz2 | |
ext4: count hits/misses of extent cache and expose in sysfs
The number of hits and misses for each filesystem is exposed in
/sys/fs/ext4/<dev>/extent_cache_{hits, misses}.
Tested: fsstress, manual checks.
Signed-off-by: Vivek Haldar <haldar@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/extents.c')
| -rw-r--r-- | fs/ext4/extents.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 9a3844a..4444317 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -2035,6 +2035,7 @@ ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block, struct ext4_extent *ex) { struct ext4_ext_cache *cex; + struct ext4_sb_info *sbi; int ret = 0; /* @@ -2042,6 +2043,7 @@ ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block, */ spin_lock(&EXT4_I(inode)->i_block_reservation_lock); cex = &EXT4_I(inode)->i_cached_extent; + sbi = EXT4_SB(inode->i_sb); /* has cache valid data? */ if (cex->ec_len == 0) @@ -2057,6 +2059,10 @@ ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block, ret = 1; } errout: + if (!ret) + sbi->extent_cache_misses++; + else + sbi->extent_cache_hits++; spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); return ret; } @@ -3901,4 +3907,3 @@ int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, return error; } - |