Messages in this thread Patch in this message | | | From | Liu Song <> | Subject | [RFC PATCH v2] blk-mq: hctx has only one ctx mapping is no need to redirect the completion | Date | Thu, 22 Sep 2022 16:27:54 +0800 |
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From: Liu Song <liusong@linux.alibaba.com>
High-performance NVMe devices usually support a larger number of hw queue, 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> --- block/blk-mq.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c index c11949d..7f9be13 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1093,10 +1093,11 @@ 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. + * If the request's hctx has only one ctx mapping, + * or is a polled request, both 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)) { -- 1.8.3.1
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