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authorJosef Bacik <josef@toxicpanda.com>2018-09-28 13:45:40 -0400
committerJens Axboe <axboe@kernel.dk>2018-09-28 11:47:28 -0600
commit9f60511a021e677c43b3e2d1a890e3d0d372e394 (patch)
tree357db225648674eaf5fa5467e2fe9f6367564013 /block
parentff4cee0898756f07f8b50b30ea00efc773de24e6 (diff)
downloadlinux-9f60511a021e677c43b3e2d1a890e3d0d372e394.tar.bz2
blk-iolatency: deal with nr_requests == 1
Hitting the case where blk_queue_depth() returned 1 uncovered the fact that iolatency doesn't actually handle this case properly, it simply doesn't scale down anybody. For this case we should go straight into applying the time delay, which we weren't doing. Since we already limit the floor at 1 request this if statement is not needed, and this allows us to set our depth to 1 which allows us to apply the delay if needed. Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-iolatency.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index c2e38bc12f27..8daea7a4fe49 100644
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -312,7 +312,7 @@ static void scale_change(struct iolatency_grp *iolat, bool up)
iolat->rq_depth.max_depth = old;
wake_up_all(&iolat->rq_wait.wait);
}
- } else if (old > 1) {
+ } else {
old >>= 1;
iolat->rq_depth.max_depth = max(old, 1UL);
}