linux-kernel - Re: [PATCH v3 3/7] sched: throttle cfs_rq entities which exceed their local quota

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Message-Id: <20101015083032.c9a1b2aa.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 15 Oct 2010 08:30:32 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Paul Turner <pjt@...gle.com>, bharata@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org,
	Dhaval Giani <dhaval.giani@...il.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Herbert Poetzl <herbert@...hfloor.at>,
	Avi Kivity <avi@...hat.com>,
	Chris Friesen <cfriesen@...tel.com>,
	Paul Menage <menage@...gle.com>,
	Mike Waychison <mikew@...gle.com>,
	Nikhil Rao <ncrao@...gle.com>
Subject: Re: [PATCH v3 3/7] sched: throttle cfs_rq entities which exceed
 their local quota

On Thu, 14 Oct 2010 12:41:44 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> On Thu, 2010-10-14 at 03:25 -0700, Paul Turner wrote:
> > > "When vcpu holds spinlock in kernel, please don't sleep.." will be nice.
> > > Is there patch already ? 
> 
> Oh you're talking about the guest spinlock crap?

yes ;)

> I don't particularly care about that.. that's a virt problem you see ;-)

Hmm. AFAIK, all qemu's thread will be under a cgroup. So, I'll be happy if
a vcpu is on a loop to wait for spinlock yields immediately...But I'm not
famliar with this area, either. Thanks.

-Kame

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