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| author | Yufen Yu <yuyufen@huawei.com> | 2019-03-26 21:19:25 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-04-02 08:57:05 -0600 |
| commit | ff3b74b8e1675c802e09157a56c97ca38a659b9d (patch) | |
| tree | 2bcf6917ee428014a7645dc806e51a34ffbc79e4 | |
| parent | b9a1ff504b9492ad6beb7d5606e0e3365d4d8499 (diff) | |
| download | linux-ff3b74b8e1675c802e09157a56c97ca38a659b9d.tar.gz linux-ff3b74b8e1675c802e09157a56c97ca38a659b9d.tar.bz2 linux-ff3b74b8e1675c802e09157a56c97ca38a659b9d.zip | |
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: Christoph Hellwig <hch@lst.de>
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | block/blk-mq.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index f3b0d33bdf88..22074a1e37cd 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2003,11 +2003,13 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio) plug->rq_count--; } blk_add_rq_to_plug(plug, rq); + trace_block_plug(q); blk_mq_put_ctx(data.ctx); 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); } |