From: Christoph Hellwig <hch@infradead.org>
To: Jan Kara <jack@suse.cz>
Cc: Christoph Hellwig <hch@infradead.org>,
Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org,
Paolo Valente <paolo.valente@linaro.org>
Subject: Re: [PATCH] blktrace: Provide event for request merging
Date: Thu, 18 Jun 2020 23:52:40 -0700 [thread overview]
Message-ID: <20200619065240.GA3212@infradead.org> (raw)
In-Reply-To: <20200618161331.GD9664@quack2.suse.cz>
On Thu, Jun 18, 2020 at 06:13:31PM +0200, Jan Kara wrote:
> On Wed 17-06-20 23:53:59, Christoph Hellwig wrote:
> > On Wed, Jun 17, 2020 at 03:58:23PM +0200, Jan Kara wrote:
> > > blk_account_io_merge_request(next);
> > >
> > > + trace_block_rq_merge(q, next);
> >
> > q can be derived from next, no need to explicitly pass it. And yes,
> > I know a lot of existing tracepoints do so, but I plan to fix that up
> > as well.
>
> I had a look into it now and I could do this but that would mean that
> block_rq_merge trace event would now differ from all other similar events
> and we couldn't use block_rq event class and have to define our own and so
> overall it would IMO make future conversion to get rid of 'q' argument more
> difficult, not simpler. So I can do this but are you really sure?
Ok, let's keep the original version for now then.
next prev parent reply other threads:[~2020-06-19 6:52 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-17 13:58 [PATCH] blktrace: Provide event for request merging Jan Kara
2020-06-17 17:41 ` Chaitanya Kulkarni
2020-06-18 12:04 ` Jan Kara
2020-06-18 15:36 ` Chaitanya Kulkarni
2020-06-18 6:53 ` Christoph Hellwig
2020-06-18 12:05 ` Jan Kara
2020-06-18 16:13 ` Jan Kara
2020-06-18 17:31 ` Chaitanya Kulkarni
2020-06-19 6:52 ` Christoph Hellwig [this message]
2020-06-25 19:51 ` Jan Kara
2020-06-26 0:03 ` Chaitanya Kulkarni
2020-06-26 3:06 ` Jens Axboe
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