[PATCH v1 6/6] blk-mq: mark ctx as pending at batch in flush plug path

[Ming Lei]

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.
Signed-off-by: Ming Lei <ming....@canonical.com>
---
 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 a5e33bc..b169e2d 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);
-- 
1.9.1

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