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

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Date:	Wed, 28 Sep 2011 17:49:58 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	Jens Axboe <axboe@...nel.dk>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [patch 2/2]block: add missed trace_block_plug

Shaohua Li <shaohua.li@...el.com> writes:

> 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>
Reviewed-by: Namhyung Kim <namhyung@...il.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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