| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.19 082/158] blk-iolatency: only account submitted bios | Date | Mon, 15 Jul 2019 10:16:53 -0400 |
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From: Dennis Zhou <dennis@kernel.org>
[ Upstream commit a3fb01ba5af066521f3f3421839e501bb2c71805 ]
As is, iolatency recognizes done_bio and cleanup as ending paths. If a request is marked REQ_NOWAIT and fails to get a request, the bio is cleaned up via rq_qos_cleanup() and ended in bio_wouldblock_error(). This results in underflowing the inflight counter. Fix this by only accounting bios that were actually submitted.
Signed-off-by: Dennis Zhou <dennis@kernel.org> Cc: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org> --- block/blk-iolatency.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c index 6b8396ccb5c4..75df47ad2e79 100644 --- a/block/blk-iolatency.c +++ b/block/blk-iolatency.c @@ -565,6 +565,10 @@ static void blkcg_iolatency_done_bio(struct rq_qos *rqos, struct bio *bio) if (!blkg) return; + /* We didn't actually submit this bio, don't account it. */ + if (bio->bi_status == BLK_STS_AGAIN) + return; + iolat = blkg_to_lat(bio->bi_blkg); if (!iolat) return; -- 2.20.1
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