From cfd0c552a8272d691691f40073654d775836e23a Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Tue, 20 Oct 2015 23:13:57 +0800 Subject: [PATCH] blk-mq: mark ctx as pending at batch in flush plug path Most of times, flush plug should be the hottest I/O path, so mark ctx as pending after all requests in the list are inserted. Reviewed-by: Jeff Moyer Signed-off-by: Ming Lei Signed-off-by: Jens Axboe --- block/blk-mq.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 24c528f182ea..159e69bd2c3c 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -990,18 +990,25 @@ void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs) } EXPORT_SYMBOL(blk_mq_delay_queue); -static void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, - struct request *rq, bool at_head) +static inline void __blk_mq_insert_req_list(struct blk_mq_hw_ctx *hctx, + struct blk_mq_ctx *ctx, + struct request *rq, + bool at_head) { - struct blk_mq_ctx *ctx = rq->mq_ctx; - trace_block_rq_insert(hctx->queue, rq); if (at_head) list_add(&rq->queuelist, &ctx->rq_list); else list_add_tail(&rq->queuelist, &ctx->rq_list); +} + +static void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, + struct request *rq, bool at_head) +{ + struct blk_mq_ctx *ctx = rq->mq_ctx; + __blk_mq_insert_req_list(hctx, ctx, rq, at_head); blk_mq_hctx_mark_pending(hctx, ctx); } @@ -1057,8 +1064,9 @@ static void blk_mq_insert_requests(struct request_queue *q, rq = list_first_entry(list, struct request, queuelist); list_del_init(&rq->queuelist); rq->mq_ctx = ctx; - __blk_mq_insert_request(hctx, rq, false); + __blk_mq_insert_req_list(hctx, ctx, rq, false); } + blk_mq_hctx_mark_pending(hctx, ctx); spin_unlock(&ctx->lock); blk_mq_run_hw_queue(hctx, from_schedule); -- 2.20.1