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

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Message-ID: <20120111173036.GG26832@google.com>
Date:	Wed, 11 Jan 2012 09:30:36 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	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

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.

-- 
tejun
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