linux-kernel - Re: [PATCH 00/10] jump label: introduce very

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Date:	Wed, 22 Feb 2012 13:58:10 -0500
From:	Jason Baron <jbaron@...hat.com>
To:	Richard Henderson <rth@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	mathieu.desnoyers@...icios.com, davem@...emloft.net,
	ddaney.cavm@...il.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 00/10] jump label: introduce very_[un]likely + cleanups +
 docs

On Wed, Feb 22, 2012 at 09:14:19AM -0800, Richard Henderson wrote:
> On 02/22/12 07:32, Peter Zijlstra wrote:
> > So I clicked the link Jason provided in his 10/10 Documentation patch
> > and stumbled upon:
> > 
> >   http://gcc.gnu.org/ml/gcc-patches/2009-07/msg01558.html
> > 
> > Where rth suggests that __attribute__((hot,cold)) might work on the
> > destination labels. Trying this my compiler (4.6.1+crap) pukes all over
> > me suggesting this isn't (yet) implemented.
> > 
> > Richard, is something like that still on the table?
> 
> It's still a possibility.  I gave Jason a patch for that quite some time
> ago; I don't recall hearing whether it turned out to actually be useful.
> 
> 
> r~

I don't think I ever quite got it working, and I've unfortunately
misplaced it at this point. I am definitely interested in trying it
again though. If you can re-send it, I'll try it.

Also, I think I seem to recall it wouldn't help the -Os case, b/c we
don't get block re-ordering?

Thanks,

-Jason
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