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

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Message-ID: <20091126085249.GQ8742@kernel.dk>
Date:	Thu, 26 Nov 2009 09:52:49 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Ingo Molnar <mingo@...e.hu>
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

On Thu, Nov 26 2009, Ingo Molnar wrote:
> 
> * Jens Axboe <jens.axboe@...cle.com> wrote:
> 
> > On Thu, Nov 26 2009, Ingo Molnar wrote:
> > > 
> > > * 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.
> > 
> > OK, lets merge them through -tip then. You can add my acked-by.
> 
> Thanks Jens!
> 
> Do you have any pending (or planned) changes to 
> include/trace/events/block.h in the block tree that might cause 
> problems?
> 
> We can pick those up too (and resolve any conflicts) to reduce the 
> surface of friction.

Nope, I don't have any block tracing bits pending for 2.6.33, so we wont
have merge issues there.

-- 
Jens Axboe

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