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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>
This commit is contained in:
Shaohua Li 2011-11-16 09:21:50 +01:00 committed by Jens Axboe
parent a2c2a0e668
commit 019ceb7d5d
1 changed files with 3 additions and 1 deletions
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4
block/blk-core.c
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@ -1387,8 +1387,10 @@ get_rq:
if (__rq->q != q) if (__rq->q != q)
plug->should_sort = 1; plug->should_sort = 1;
} }
if (request_count >= BLK_MAX_REQUEST_COUNT) if (request_count >= BLK_MAX_REQUEST_COUNT) {
blk_flush_plug_list(plug, false); blk_flush_plug_list(plug, false);
trace_block_plug(q);
}
} }
list_add_tail(&req->queuelist, &plug->list); list_add_tail(&req->queuelist, &plug->list);
drive_stat_acct(req, 1); drive_stat_acct(req, 1);