diff options
| author | Konstantin Khlebnikov <khlebnikov@yandex-team.ru> | 2019-11-21 13:40:26 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-11-21 19:06:47 +0300 |
| commit | b6866318657717c8914673a6394894d12bc9ff5e (patch) | |
| tree | f4d534373b711f368f079d0cc54d3d71892e1feb /block/partition-generic.c | |
| parent | 40d47c155e8ae9bcb3f2d0d01cf14d903c664726 (diff) | |
| download | linux-b6866318657717c8914673a6394894d12bc9ff5e.tar.xz | |
block: add iostat counters for flush requests
Requests that triggers flushing volatile writeback cache to disk (barriers)
have significant effect to overall performance.
Block layer has sophisticated engine for combining several flush requests
into one. But there is no statistics for actual flushes executed by disk.
Requests which trigger flushes usually are barriers - zero-size writes.
This patch adds two iostat counters into /sys/class/block/$dev/stat and
/proc/diskstats - count of completed flush requests and their total time.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/partition-generic.c')
| -rw-r--r-- | block/partition-generic.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/block/partition-generic.c b/block/partition-generic.c index aee643ce13d1..3db8b73a96b1 100644 --- a/block/partition-generic.c +++ b/block/partition-generic.c @@ -127,7 +127,8 @@ ssize_t part_stat_show(struct device *dev, "%8lu %8lu %8llu %8u " "%8lu %8lu %8llu %8u " "%8u %8u %8u " - "%8lu %8lu %8llu %8u" + "%8lu %8lu %8llu %8u " + "%8lu %8u" "\n", part_stat_read(p, ios[STAT_READ]), part_stat_read(p, merges[STAT_READ]), @@ -143,7 +144,9 @@ ssize_t part_stat_show(struct device *dev, part_stat_read(p, ios[STAT_DISCARD]), part_stat_read(p, merges[STAT_DISCARD]), (unsigned long long)part_stat_read(p, sectors[STAT_DISCARD]), - (unsigned int)part_stat_read_msecs(p, STAT_DISCARD)); + (unsigned int)part_stat_read_msecs(p, STAT_DISCARD), + part_stat_read(p, ios[STAT_FLUSH]), + (unsigned int)part_stat_read_msecs(p, STAT_FLUSH)); } ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, |