linux-kernel - Re: [PATCH] x86: Reduce the default HZ value

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Message-Id: <1241718925.6311.1586.camel@laptop>
Date:	Thu, 07 May 2009 19:55:25 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Alok Kataria <akataria@...are.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	the arch/x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] x86: Reduce the default HZ value

On Thu, 2009-05-07 at 13:34 -0400, Christoph Lameter wrote:
> On Thu, 7 May 2009, Peter Zijlstra wrote:
> 
> > Somehow people like involuntary preemption to happen at slightly more
> > than glacial pace as well.
> 
> These intervals could be dynamically established by the scheduler.
> 
> If there is a single process running on a processor and no other process
> is contending then there is no need to do involuntary preemption.

Sure, and CONFIG_SCHED_HRTICK does that, the trick is getting it to not
hurt others.

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