Commit ff3b74b8 authored by Yufen Yu's avatar Yufen Yu Committed by Jens Axboe
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blk-mq: add trace block plug and unplug for multiple queues

For now, we just trace plug for single queue device or drivers
provide .commit_rqs, and have not trace plug for multiple queues
device. But, unplug events will be recorded when call
blk_mq_flush_plug_list(). Then, trace events will be asymmetrical,
just have unplug and without plug.

This patch add trace plug and unplug for multiple queues device in
blk_mq_make_request(). After that, we can accurately trace plug and
unplug for multiple queues.

Reviewed-by: default avatarChristoph Hellwig <>
Signed-off-by: default avatarYufen Yu <>
Signed-off-by: default avatarJens Axboe <>
parent b9a1ff50
......@@ -2003,11 +2003,13 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio)
blk_add_rq_to_plug(plug, rq);
if (same_queue_rq) {
data.hctx = same_queue_rq->mq_hctx;
trace_block_unplug(q, 1, true);
blk_mq_try_issue_directly(data.hctx, same_queue_rq,
&cookie, false, true);
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