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Date: Wed, 18 Apr 2007 21:43:39 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Mackall <mpm@selenic.com>, Nick Piggin <npiggin@suse.de>,
       William Lee Irwin III <wli@holomorphy.com>,
       Peter Williams <pwil3058@bigpond.net.au>,
       Mike Galbraith <efault@gmx.de>, Con Kolivas <kernel@kolivas.org>,
       ck list <ck@vds.kolivas.org>, Bill Huey <billh@gnuppy.monkey.org>,
       linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
       Arjan van de Ven <arjan@infradead.org>,
       Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
Message-ID: <20070418194339.GA26739@elte.hu>
References: <20070418031511.GA18452@wotan.suse.de> <20070418043831.GR11115@waste.org> <20070418050024.GF18452@wotan.suse.de> <20070418055525.GS11115@waste.org> <alpine.LFD.0.98.0704180742470.2828@woody.linux-foundation.org> <20070418152355.GU11115@waste.org> <alpine.LFD.0.98.0704181012470.2828@woody.linux-foundation.org> <20070418174945.GA7930@elte.hu> <20070418175936.GA11980@elte.hu> <alpine.LFD.0.98.0704181223190.2828@woody.linux-foundation.org>
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* Linus Torvalds <torvalds@linux-foundation.org> wrote:

> For example, maybe we can approximate it by spreading out the 
> statistics: right now you have things like
> 
>  - last_ran, wait_runtime, sum_wait_runtime..
> 
> be per-thread things. [...]

yes, yes, yes! :) My thinking is "struct sched_group" embedded into 
_arbitrary_ other resource containers and abstractions, which 
sched_group's are then in a simple hierarchy and are driven by the core 
scheduling machinery.

> [...] Maybe some of those can be spread out, so that you put a part of 
> them in the "struct vm_struct" thing (to approximate processes), part 
> of them in the "struct user" struct (to approximate the user-level 
> thing), and part of it in a per-container thing for when/if we support 
> that kind of thing?

yes.

	Ingo