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

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Message-Id: <1236949440.5188.709.camel@laptop>
Date:	Fri, 13 Mar 2009 14:04:00 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Ingo Molnar <mingo@...e.hu>, 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

On Fri, 2009-03-13 at 13:44 +0100, Peter Zijlstra wrote:

> The same for task migration, most migrations happen when they are in
> fact running, so there too we can account the migration either before we
> rip it off the src cpu, or after we place it on the dst cpu.

Right, I got confused between being on the cpu and having ->state = R.

Migrations are the odd one out indeed, but I'd rather fudge a little
with the migration counter itself than have this weird asymmetry.

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