linux-kernel - Re: [patch] sched

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Message-ID: <20070525073836.GC8094@one.firstfloor.org>
Date:	Fri, 25 May 2007 09:38:36 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Satyam Sharma <satyam.sharma@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [patch] sched_clock(): cleanups

On Fri, May 25, 2007 at 09:26:41AM +0200, Ingo Molnar wrote:
> 
> > > if (!f)
> > > 	f = cpufreq_get(freq->cpu);
> > > if (!f)
> > > 	f = tsc_khz;
> > > 
> > > ?
> > > 
> > > Something's not quite right here :-)
> 
> ah, that's fine. It does this: 'try to give f a value', and then: 'if 
> still no value then give it tsc_khz as a last resort)
> 
> call_r_s_f() still needs an urgent rerenaming though =B-)

The whole thing would be much simpler if

- cpu up callbacks had a way to request executing on the target CPU
[i looked at this, but it was a little more involved than a simple
cleanup]
- smp_call_function_single had sane semantics regarding calling
the same CPU similar to on_each_cpu()
- C had anonymous lambda functions with nice syntax (ok one can dream) 

But right now so many callbacks are needed that I ran out of good
names.

-Andi

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