linux-kernel - Re: [RFC PATCH] sched: START_NICE feature (temporarily niced forks) (v4)

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Date:	Wed, 22 Sep 2010 13:51:04 +0200
From:	Mike Galbraith <efault@....de>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [RFC PATCH] sched: START_NICE feature (temporarily niced
 forks) (v4)

On Tue, 2010-09-21 at 16:04 +0200, Mike Galbraith wrote:

> Perhaps take that vslice penalty, apply it to parent and child, and if
> present, deduct sleep time from their debt, and only credit sleep time
> if there's anything left over?  In any case, seems to me that sleep time
> has to be included in the equation while the penalty is in effect.
> 
> Guess I'll try that, see what happens.

Nothing good.  Several flavors thereof.

> (but that will likely negate much of the benefit for your testcase,
> where parent and child sleep)

(yup, it did)

BTTODB.

	-Mike

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