linux-kernel - Re: [RFC patch 1/2] sched: dynamically adapt granularity with nr

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Message-Id: <1284369373.14710.11.camel@marge.simson.net>
Date:	Mon, 13 Sep 2010 11:16:13 +0200
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	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 1/2] sched: dynamically adapt granularity with
 nr_running

On Mon, 2010-09-13 at 10:35 +0200, Peter Zijlstra wrote:
> On Mon, 2010-09-13 at 09:08 +0200, Mike Galbraith wrote:
> > We need a better fork fairness gizmo.
> 
> Proper zero-lag insertion would do. Much sadness in that tracking that
> costs a u64 mult per enqueu/dequeue and using it adds a s64 div.

(math _sucks_:)

> But if you want, have a play with:

maximum latency: 48475.3 µs
average latency: 6881.4 µs
missed timer events: 0

Darn.

make -j3 is gaining a tad over a hog as well, roughly the same as
turning START_DEBIT off.

	-Mike

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