linux-kernel - Re: [PATCH 2/9] block: block_bio_complete tracepoint was missing

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Date:	Thu, 12 Jan 2012 09:24:11 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	Tejun Heo <tj@...nel.org>
CC:	Steven Rostedt <rostedt@...dmis.org>, axboe@...nel.dk,
	mingo@...hat.com, fweisbec@...il.com, teravest@...gle.com,
	slavapestov@...gle.com, ctalbott@...gle.com, dhsharp@...gle.com,
	linux-kernel@...r.kernel.org, winget@...gle.com, namhyung@...il.com
Subject: Re: [PATCH 2/9] block: block_bio_complete tracepoint was missing

2012-01-12 2:30 AM, Tejun Heo wrote:
> Hello,
>
> On Wed, Jan 11, 2012 at 12:25:32PM -0500, Steven Rostedt wrote:
>> On Tue, 2012-01-10 at 10:28 -0800, Tejun Heo wrote:
>>> block_bio_complete tracepoint was defined but not invoked anywhere.
>>> Fix it.
>>>
>>> -tj: This will generate duplicate BLK_TA_COMPLETEs.  Namhyung is
>>>       working on proper solution.
>>>
>>> DO_NOT_APPLY
>>> Cc: Namhyung Kim<namhyung@...il.com>
>>> ---
>>>   fs/bio.c |    3 +++
>>>   1 files changed, 3 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/fs/bio.c b/fs/bio.c
>>> index b1fe82c..96548da 100644
>>> --- a/fs/bio.c
>>> +++ b/fs/bio.c
>>> @@ -1447,6 +1447,9 @@ void bio_endio(struct bio *bio, int error)
>>>   	else if (!test_bit(BIO_UPTODATE,&bio->bi_flags))
>>>   		error = -EIO;
>>>
>>> +	if (bio->bi_bdev)
>>> +		trace_block_bio_complete(bdev_get_queue(bio->bi_bdev),
>>> +					 bio, error);
>>
>> I thought I commented before about using TRACE_EVENT_CONDITIONAL() here.
>> To remove that open coded branch.
>
> Yeah but this particular patch is dead now so it's a bit pointless.
> ioblame:ioblame_io uses it FWIW.  Namhyung, can you please consider
> using TRACE_EVENT_CONDITION() for you patches if applicable?
>
> Thanks.
>

Sure, I'll apply it.

Thanks,
Namhyung Kim
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