diff options
| author | Liu Song <liusong@linux.alibaba.com> | 2022-09-21 11:32:03 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-09-24 09:02:30 -0600 |
| commit | f168420c62e7a106961f2489a89f6ade84fe3f27 (patch) | |
| tree | df4dbd2492ff7150eebfdafb3135ae8a242556d8 /block | |
| parent | 81c7a63abc7c0be572b4f853e913ce93a34f6e1b (diff) | |
blk-mq: don't redirect completion for hctx withs only one ctx mapping
High-performance NVMe devices usually support a large hw queues, which
ensures a 1:1 mapping of hctx and ctx. In this case there will be no
remote request, so we don't need to care about it.
Signed-off-by: Liu Song <liusong@linux.alibaba.com>
Link: https://lore.kernel.org/r/1663731123-81536-1-git-send-email-liusong@linux.alibaba.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 29bb48de5bda..496085132899 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1093,10 +1093,12 @@ bool blk_mq_complete_request_remote(struct request *rq) WRITE_ONCE(rq->state, MQ_RQ_COMPLETE); /* - * For a polled request, always complete locally, it's pointless - * to redirect the completion. + * For request which hctx has only one ctx mapping, + * or a polled request, always complete locally, + * it's pointless to redirect the completion. */ - if (rq->cmd_flags & REQ_POLLED) + if (rq->mq_hctx->nr_ctx == 1 || + rq->cmd_flags & REQ_POLLED) return false; if (blk_mq_complete_need_ipi(rq)) { |