linux-kernel - Re: [PATCH 6/9] tracing: Convert some block events to DEFINE

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Message-ID: <20091126084443.GA1389@elte.hu>
Date:	Thu, 26 Nov 2009 09:44:43 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/9] tracing: Convert some block events to DEFINE_EVENT


* Jens Axboe <jens.axboe@...cle.com> wrote:

> On Thu, Nov 26 2009, Li Zefan wrote:
> > use TRACE_EVENT_TEMPLATE to remove duplicate code:
> > 
> >    text    data     bss     dec     hex filename
> >   53570    3284     184   57038    dece block/blk-core.o.old
> >   43702    3284     144   47130    b81a block/blk-core.o
> 
> Nice! When I played with the writeback tracing, I did notice that code
> bloat does get pretty severe quickly.
> 
> I have applied this to for-2.6.33, thanks a lot.

Note that it wont build in your tree, because the TRACE_EVENT_TEMPLATE / 
DEFINE_EVENT facility this relies on is not upstream yet.

The events are not affected in any way (and block/* is not modified) - 
it's just a more efficient representation of the same. I've applied them 
to -tip, to keep the facility and dependent updates in a single place.

	Ingo
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