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| author | Aleksei Zakharov <zakharov.a.g@yandex.ru> | 2019-02-11 13:10:34 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-02-11 08:20:14 -0700 |
| commit | b7143fe67bfc3b83a9e11371da659e1e70a1bbf3 (patch) | |
| tree | 97680f2159fc96f58d83743844ab1b1d1f025cb1 /block | |
| parent | 0586942f03b71bc95b0ee356ff6b09d53acbad06 (diff) | |
| download | linux-b7143fe67bfc3b83a9e11371da659e1e70a1bbf3.tar.gz linux-b7143fe67bfc3b83a9e11371da659e1e70a1bbf3.tar.bz2 linux-b7143fe67bfc3b83a9e11371da659e1e70a1bbf3.zip | |
block: avoid setting wbt_lat_usec to current value
There's no reason to set wbt min lat and freeze request queue
if current value is the same.
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Aleksei Zakharov <zakharov.a.g@yandex.ru>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-sysfs.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 94e1b052abbc..59685918167e 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -468,6 +468,9 @@ static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, else if (val >= 0) val *= 1000ULL; + if (wbt_get_min_lat(q) == val) + return count; + /* * Ensure that the queue is idled, in case the latency update * ends up either enabling or disabling wbt completely. We can't |