linux-kernel - Re: [PATCH] perfcounters: Make s/w counters in a group only count when group is on

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Message-ID: <20090314115105.GC3805@elte.hu>
Date:	Sat, 14 Mar 2009 12:51:05 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] perfcounters: Make s/w counters in a group only count
	when group is on


* Paul Mackerras <paulus@...ba.org> wrote:

> Peter Zijlstra writes:
> 
> > The issue I have with your approach is two-fold:
> >  - it breaks the symmetry between software and hardware counters by
> >    treating them differently.
> 
> So... I was about to restore that symmetry by implementing 
> lazy PMU context switching.  [...]

That would be _really_ neat to have.

	Ingo
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