linux-kernel - Re: [RFC] [PATCH] allow low HZ values?

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Message-ID: <alpine.LFD.2.00.1010121854430.2909@localhost6.localdomain6>
Date:	Tue, 12 Oct 2010 18:56:23 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andi Kleen <andi@...stfloor.org>
cc:	Tim Pepper <lnxninja@...ux.vnet.ibm.com>,
	Marcio Saito <marcio@...lades.com>,
	John Stultz <johnstul@...ibm.com>,
	Jiri Slaby <jirislaby@...il.com>,
	Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Avantika Mathur <mathur@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org, jblunck@...radead.org
Subject: Re: [RFC] [PATCH] allow low HZ values?

On Tue, 12 Oct 2010, Andi Kleen wrote:
> Thomas Gleixner <tglx@...utronix.de> writes:
> > We have told HPC folks for years that we need a kind of "NOHZ" mode
> > for HPC where we can transparently switch off the tick when only one
> > user space bound thread is active and switch back to normal once this
> > thing terminates or goes into the kernel via a syscall. Sigh, nothing
> > happened ever except for repeating the same crap patches over and
> > over.
> 
> Jan Blunck posted a patch for this exactly few months ago.
> Unfortunately it didn't get the accounting right, but other than
> that it seemed like a reasonable starting point.

Unfortunately it did not get a lot of other things right either.

Thanks,

	tglx
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