linux-kernel - Re: [patchlet] sched: fix rt throttle runtime borrowing

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Message-ID: <1299572892.7949.16.camel@marge.simson.net>
Date:	Tue, 08 Mar 2011 09:28:12 +0100
From:	Mike Galbraith <efault@....de>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patchlet] sched: fix rt throttle runtime borrowing

On Tue, 2011-03-08 at 16:19 +0800, Yong Zhang wrote:
> On Mon, Mar 7, 2011 at 5:33 PM, Mike Galbraith <efault@....de> wrote:
> > Well, it does prevent complete death, but you have to be pretty darn
> > attentive to notice that the patient is still technically alive ;-)
> >
> > As such, turning borrowing off by default, and making borrowing up to
> > within a micron of 100% CPU an opt-in feature likely makes more sense.
> 
> Another idea comes into my head is: disable runtime borrowing for
> root_task_group forever by default, but keep current behavior
> for the sub-groups :)

Yeah, that's one of the things I was pondering.  No parent, no
borrowing.

	-Mike

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