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| author | Omar Sandoval <osandov@fb.com> | 2018-05-09 11:08:53 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-05-09 16:33:09 +0200 |
| commit | 522a777566f5669606a1227bf13f3fb40963780b (patch) | |
| tree | 7d37c9d591e5a9abb4fd1209f1c503ae1a0e8475 /drivers/md | |
| parent | block: move blk_stat_add() to __blk_mq_end_request() (diff) | |
| download | linux-522a777566f5669606a1227bf13f3fb40963780b.tar.xz linux-522a777566f5669606a1227bf13f3fb40963780b.zip | |
block: consolidate struct request timestamp fields
Currently, struct request has four timestamp fields:
- A start time, set at get_request time, in jiffies, used for iostats
- An I/O start time, set at start_request time, in ktime nanoseconds,
used for blk-stats (i.e., wbt, kyber, hybrid polling)
- Another start time and another I/O start time, used for cfq and bfq
These can all be consolidated into one start time and one I/O start
time, both in ktime nanoseconds, shaving off up to 16 bytes from struct
request depending on the kernel config.
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-rq.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c index bf0b840645cc..1c18f335da04 100644 --- a/drivers/md/dm-rq.c +++ b/drivers/md/dm-rq.c @@ -406,7 +406,7 @@ static blk_status_t dm_dispatch_clone_request(struct request *clone, struct requ if (blk_queue_io_stat(clone->q)) clone->rq_flags |= RQF_IO_STAT; - clone->start_time = jiffies; + clone->start_time_ns = ktime_get_ns(); r = blk_insert_cloned_request(clone->q, clone); if (r != BLK_STS_OK && r != BLK_STS_RESOURCE && r != BLK_STS_DEV_RESOURCE) /* must complete clone in terms of original request */ |