linux-kernel - Re: [accounting regression since rc1] scheduler updates

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Message-ID: <20070821100717.GA692@one.firstfloor.org>
Date:	Tue, 21 Aug 2007 12:07:17 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Jan Glauber <jang@...ux.vnet.ibm.com>,
	heiko.carstens@...ibm.com, Paul Mackerras <paulus@...ba.org>
Subject: Re: [accounting regression since rc1]  scheduler updates

On Tue, Aug 21, 2007 at 09:09:22AM +0200, Ingo Molnar wrote:
> 
> * Andi Kleen <andi@...stfloor.org> wrote:
> 
> > You should just be using idle notifiers instead instead of adding more 
> > and more custom hooks (like NOHZ has already) x86-64 still has them 
> > and there is a old patch around to add them to i386.
> 
> these are specially placed callbacks that we want to call from certain 
> ACPI codepaths but not from all of them.

Because you believe TSC only stops in C2 and C3? That's not correct on
all systems.

-Andi
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