linux-kernel - Re: [ck] Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

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Date:	Wed, 18 Apr 2007 10:48:14 -0700
From:	Mark Glines <mark@...nes.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Matt Mackall <mpm@...enic.com>, Nick Piggin <npiggin@...e.de>,
	Bill Huey <billh@...ppy.monkey.org>,
	Mike Galbraith <efault@....de>,
	Peter Williams <pwil3058@...pond.net.au>,
	William Lee Irwin III <wli@...omorphy.com>,
	linux-kernel@...r.kernel.org, ck list <ck@....kolivas.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [ck] Re: [Announce] [patch] Modular Scheduler Core and
 Completely Fair Scheduler [CFS]

On Wed, 18 Apr 2007 10:22:59 -0700 (PDT)
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> So if you have 2 users on a machine running CPU hogs, you should
> *first* try to be fair among users. If one user then runs 5 programs,
> and the other one runs just 1, then the *one* program should get 50%
> of the CPU time (the users fair share), and the five programs should
> get 10% of CPU time each. And if one of them uses two threads, each
> thread should get 5%.

This sounds great, to me.

One minor question: is it even possible to be completely fair on SMP?
For instance, if you have a 2-way SMP box running 3 applications, one of
which has 2 threads, will the threaded app have an advantage here?  (The
current system seems to try to keep each thread on a specific CPU, to
reduce cache thrashing, which means threads and processes alike each
get 50% of the CPU.)

Mark
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