linux-kernel - Re: [PATCH] Add a tracepoint for block request remapping

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Message-ID: <4AB39A88.3040106@ce.jp.nec.com>
Date:	Fri, 18 Sep 2009 23:34:48 +0900
From:	"Jun'ichi Nomura" <j-nomura@...jp.nec.com>
To:	Li Zefan <lizf@...fujitsu.com>
CC:	linux-kernel@...r.kernel.org,
	device-mapper development <dm-devel@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Alasdair G Kergon <agk@...hat.com>
Subject: Re: [PATCH] Add a tracepoint for block request remapping

Li Zefan wrote:
> Jun'ichi Nomura wrote:
>> Since 2.6.31 now has request-based device-mapper, it's useful to have
>> a tracepoint for request-remapping as well as bio-remapping.
>>
>> This patch adds a tracepoint for request-remapping, trace_block_rq_remap().
> 
>> Existing trace_block_remap() is left unchanged but it might be better to
>> rename it to trace_block_bio_remap().
> 
> Why not. ;)

OK, I'll add a renaming patch.

>> +static void blk_add_trace_rq_remap(struct request_queue *q,
>> +				   struct request *rq, dev_t dev,
>> +				   sector_t from)
>> +{
>> +	struct blk_trace *bt = q->blk_trace;
>> +	struct blk_io_trace_remap r;
>> +
>> +	if (likely(!bt))
>> +		return;
>> +
>> +	r.device_from = cpu_to_be32(dev);
>> +	r.device_to   = disk_devt(rq->rq_disk);
> 
> cpu_to_be32(dis_devt(...))

Thank you! I'll fix that.

>> +	r.sector_from = cpu_to_be64(from);
>> +
>> +	__blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq),
>> +			rq_data_dir(rq), BLK_TA_REMAP, !!rq->errors,
>> +			sizeof(r), &r);
>> +}

-- 
Jun'ichi Nomura, NEC Corporation
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