linux-kernel - Re: [RFC v2 PATCH 0/8] CFS Hard limits

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Message-ID: <20091013220221.GH24787@MAIL.13thfloor.at>
Date:	Wed, 14 Oct 2009 00:02:22 +0200
From:	Herbert Poetzl <herbert@...hfloor.at>
To:	Pavel Emelyanov <xemul@...nvz.org>
Cc:	vatsa@...ibm.com, Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Avi Kivity <avi@...hat.com>,
	Chris Friesen <cfriesen@...tel.com>,
	Paul Menage <menage@...gle.com>,
	Mike Waychison <mikew@...gle.com>
Subject: Re: [RFC v2 PATCH 0/8] CFS Hard limits - v2

On Tue, Oct 13, 2009 at 04:19:41PM +0400, Pavel Emelyanov wrote:
> > as I already stated, it seems perfectly fine for me 
> 
> You're not the only one interested in it, sorry. Besides, I
> got your point in "I'm find with it". Now get mine which is
> about "I am not".

> > can be trivially mapped to the two values, by chosing a
> > fixed multiplicative base (let's say '1s' to simplify :) 

> >   with 50%, you get 1s/0.5s
> >   with 20%, you get 1s/0.2s
> >   with  5%, you get 1s/0.05s

> > well, you get the idea :)

> No I don't.
> Is 1s/0.5s worse or better than 2s/1s?
> How should I make a choice?

and because _you_ are unable to make a choice, you
want that choice to be removed alltogether?

don't you see that your suggestions are less powerful
than the one provided by the patch, mainly because
they are only a subset (depending on your choice) 

besides that, it _is_ trivial to map the percentage,
but it isn't trivial to 'guess' what the user wants
(i.e. the amount of interactivity)

best,
Herbert

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