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

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Message-ID: <Pine.LNX.4.64.0704190837420.31693@alien.or.mcafeemobile.com>
Date:	Thu, 19 Apr 2007 08:43:41 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>, Nick Piggin <npiggin@...e.de>,
	William Lee Irwin III <wli@...omorphy.com>,
	Peter Williams <pwil3058@...pond.net.au>,
	Mike Galbraith <efault@....de>,
	Con Kolivas <kernel@...ivas.org>, ck list <ck@....kolivas.org>,
	Bill Huey <billh@...ppy.monkey.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair
 Scheduler [CFS]

On Thu, 19 Apr 2007, Ingo Molnar wrote:

> i disagree that the user 'would expect' this. Some users might. Others 
> would say: 'my 10-thread rendering engine is more important than a 
> 1-thread job because it's using 10 threads for a reason'. And the CFS 
> feedback so far strengthens this point: the default behavior of treating 
> the thread as a single scheduling (and CPU time accounting) unit works 
> pretty well on the desktop.
> 
> think about it in another, 'kernel policy' way as well: we'd like to 
> _encourage_ more parallel user applications. Hurting them by accounting 
> all threads together sends the exact opposite message.

There are counter argouments too. Like, not every user knows if a certain 
process is MT or not. I agree though that doing accounting and fairness at 
a depth lower then USER is messy, and not only for performance.


- Davide


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