linux-kernel - Re: [PATCH 2/7] sched: Add NEED_RESCHED to the preempt

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Date:	Thu, 12 Sep 2013 08:01:41 +0200
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>, Peter Anvin <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Len Brown <lenb@...nel.org>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Subject: Re: [PATCH 2/7] sched: Add NEED_RESCHED to the preempt_count

On Wed, 2013-09-11 at 15:34 +0200, Mike Galbraith wrote: 
> On Wed, 2013-09-11 at 13:06 +0200, Peter Zijlstra wrote: 

> > Mike does it fix the funny you saw?
> 
> Yup, modulo test_need_resched() not existing in master.

...

> while I haven't yet booted Q6600 box, core2
> Toshiba Satellite lappy is using mwait_idle_with_hints() in master.

Heh.  Core2 lappy uses mwait_idle_with_hints().. unless you boot
processor.max_cstate=1 so it doesn't use piece of shite hpet.  Q6600
always has idle woes, seemingly because box doesn't do deep enough
cstate to make something (acpi?) happy, despite mwait_idle() having
worked fine for years.

Seems I need to find the cstate dependency spot, and rap it upside the
head if I want my core2 boxen to regain happy campers status.

-Mike

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