linux-kernel - Re: [PATCH v2] perf, x86: Fix event scheduler for constraints with overlapping counters

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Date:	Thu, 28 Apr 2011 11:50:29 +0200
From:	Robert Richter <robert.richter@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] perf, x86: Fix event scheduler for constraints with
 overlapping counters

On 19.04.11 15:55:18, Robert Richter wrote:
> On 19.04.11 07:29:33, Ingo Molnar wrote:
> > 
> > * Robert Richter <robert.richter@....com> wrote:
> > 
> > > +				if (!state)
> > > +					/* no events to reschedule */
> > > +					goto done;
> > 
> > Hm, that's 5 levels of indentation. Would it be possible to factor out the gist 
> > of the logic into a helper and such? My eyes would be much happier!
> 
> Hmm, I was thinking about this too, but it is not easy since we
> control also the loops with goto's and updates of the loop
> states. Refactoring out the inner block would mean to update state
> varables via pointers and to introduce return codes which contains
> control flow information. Don't think this will become easier.
> 
> We could probably merge both for-loops in one while-loop but also on
> costs of code readability.

Ingo, do you still want me to rework it?

Any other comments on this patch?

Thanks,

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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