From 676d06077f964f06af52c19e59f0409a8880612f Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Tue, 20 Oct 2015 23:13:56 +0800 Subject: [PATCH] blk-mq: fix for trace_block_plug() The trace point is for tracing plug event of each request queue instead of each task, so we should check the request count in the plug list from current queue instead of current task. Signed-off-by: Ming Lei Reviewed-by: Jeff Moyer Signed-off-by: Jens Axboe --- block/blk-mq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index d38371160019..24c528f182ea 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1380,7 +1380,7 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio) plug = current->plug; if (plug) { blk_mq_bio_to_request(rq, bio); - if (list_empty(&plug->mq_list)) + if (!request_count) trace_block_plug(q); else if (request_count >= BLK_MAX_REQUEST_COUNT) { blk_flush_plug_list(plug, false);