From 9f60511a021e677c43b3e2d1a890e3d0d372e394 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Fri, 28 Sep 2018 13:45:40 -0400 Subject: 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 Signed-off-by: Jens Axboe --- block/blk-iolatency.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'block/blk-iolatency.c') 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); } -- cgit