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blk-mq: enable checking two part inflight counts at the same time

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Modify blk_mq_in_flight() to count both a partition and root at
the same time. Then we only have to call it once, instead of
potentially looping the tags twice.

Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2017-08-08 17:53:33 -06:00
parent f299b7c7a9
commit b8d62b3a9c
2 changed files with 33 additions and 17 deletions
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block/blk-mq.c
+8 -4
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@@ -97,11 +97,15 @@ static void blk_mq_check_inflight(struct blk_mq_hw_ctx *hctx,
if (test_bit(REQ_ATOM_STARTED, &rq->atomic_flags) &&
!test_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags)) {
/*
* Count as inflight if it either matches the partition we
* asked for, or if it's the root
* index[0] counts the specific partition that was asked
* for. index[1] counts the ones that are active on the
* whole device, so increment that if mi->part is indeed
* a partition, and not a whole device.
*/
if (rq->part == mi->part || mi->part->partno)
if (rq->part == mi->part)
mi->inflight[0]++;
if (mi->part->partno)
mi->inflight[1]++;
}
}
@@ -110,7 +114,7 @@ void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part,
{
struct mq_inflight mi = { .part = part, .inflight = inflight, };
inflight[0] = 0;
inflight[0] = inflight[1] = 0;
blk_mq_queue_tag_busy_iter(q, blk_mq_check_inflight, &mi);
}