block: add missed trace_block_plug
After flush plug list, the list has no request, so we need to add a
trace_block_plug().
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/blk-core.c b/block/blk-core.c
index 6403c12..ea70e6c 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1387,8 +1387,10 @@
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);