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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/super.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/super.c')
| -rw-r--r-- | fs/ext4/super.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index fdce4ee..874dd25 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -2439,6 +2439,18 @@ static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, EXT4_SB(sb)->s_sectors_written_start) >> 1))); } +static ssize_t extent_cache_hits_show(struct ext4_attr *a, + struct ext4_sb_info *sbi, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_hits); +} + +static ssize_t extent_cache_misses_show(struct ext4_attr *a, + struct ext4_sb_info *sbi, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_misses); +} + static ssize_t inode_readahead_blks_store(struct ext4_attr *a, struct ext4_sb_info *sbi, const char *buf, size_t count) @@ -2496,6 +2508,8 @@ static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store) EXT4_RO_ATTR(delayed_allocation_blocks); EXT4_RO_ATTR(session_write_kbytes); EXT4_RO_ATTR(lifetime_write_kbytes); +EXT4_RO_ATTR(extent_cache_hits); +EXT4_RO_ATTR(extent_cache_misses); EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show, inode_readahead_blks_store, s_inode_readahead_blks); EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); @@ -2511,6 +2525,8 @@ static struct attribute *ext4_attrs[] = { ATTR_LIST(delayed_allocation_blocks), ATTR_LIST(session_write_kbytes), ATTR_LIST(lifetime_write_kbytes), + ATTR_LIST(extent_cache_hits), + ATTR_LIST(extent_cache_misses), ATTR_LIST(inode_readahead_blks), ATTR_LIST(inode_goal), ATTR_LIST(mb_stats), |