linux-kernel - [patch 2/2]block: add missed trace_block

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Date:	Wed, 28 Sep 2011 11:11:30 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: [patch 2/2]block: add missed trace_block_plug

After flush plug list, the list has no request, so we need
add a trace_block_plug.

Signed-off-by: Shaohua Li <shaohua.li@...el.com>

---
 block/blk-core.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux/block/blk-core.c
===================================================================
--- linux.orig/block/blk-core.c	2011-09-28 11:05:22.000000000 +0800
+++ linux/block/blk-core.c	2011-09-28 11:05:42.000000000 +0800
@@ -1307,8 +1307,10 @@ get_rq:
 				if (__rq->q != q)
 					plug->should_sort = 1;
 			}
-			if (request_count >= BLK_MAX_REQUEST_COUNT)
+			if (request_count >= BLK_MAX_REQUEST_COUNT) {
 				blk_flush_plug_list(plug, false);
+				trace_block_plug(q);
+			}
 		}
 		list_add_tail(&req->queuelist, &plug->list);
 		drive_stat_acct(req, 1);


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