linux-kernel - Re: [patch] CFS scheduler, -v8

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Message-ID: <20070502191235.GA2455@elte.hu>
Date:	Wed, 2 May 2007 21:12:35 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	William Lee Irwin III <wli@...omorphy.com>
Cc:	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Ting Yang <tingy@...umass.edu>, linux-kernel@...r.kernel.org
Subject: Re: [patch] CFS scheduler, -v8

* William Lee Irwin III <wli@...omorphy.com> wrote:

> The coincidental aspect would be that at the time it was written, the 
> formal notion of lag was not being used particularly with respect to 
> priorities and load weights. [...]

(nice levels for SCHED_OTHER are 'just' an add-on concept to the core of 
CFS, in fact i had two wildly different approaches that both did the 
trick for users, so i fail to see the relevance of priorities to the 
core concept of measuring how much a task is waiting to get on the 
runqueue via the 'fair clock' ... but lets move on.)

> Things are moving in good directions on all this as far as I'm 
> concerned. Moving according to Ting Yang's analysis should wrap up the 
> soundness concerns about intra-queue policy I've had. OTOH load 
> balancing I know much less about (not that I was ever any sort of an 
> expert on single queue affairs). [...]

the whole move to ->load_weight based calculations was to make CFS 
integrate better with load-balancing and to bring the smpnice 
infrastructure even more into the scheduler mainstream. [ There's a 
small smpnice related buglet i fixed in -v9-to-be (based on Balbir 
Singh's feedback), but otherwise it behaves quite well on SMP and that's 
not a big surprise: i left the load-balancer largely intact. ]

	Ingo
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