linux-kernel - Re: [PATCH 12/14] sched: make dl_bw a sub-quota of rt

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Message-ID: <20131016085936.GU10651@twins.programming.kicks-ass.net>
Date:	Wed, 16 Oct 2013 10:59:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Juri Lelli <juri.lelli@...il.com>, tglx@...utronix.de,
	mingo@...hat.com, rostedt@...dmis.org, oleg@...hat.com,
	fweisbec@...il.com, darren@...art.com, johan.eker@...csson.com,
	p.faure@...tech.ch, linux-kernel@...r.kernel.org,
	claudio@...dence.eu.com, michael@...rulasolutions.com,
	fchecconi@...il.com, tommaso.cucinotta@...up.it,
	nicola.manica@...i.unitn.it, luca.abeni@...tn.it,
	dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...il.com, liming.wang@...driver.com, jkacur@...hat.com,
	harald.gustafsson@...csson.com, vincent.guittot@...aro.org,
	bruce.ashfield@...driver.com--no-chain-reply-to
Subject: Re: [PATCH 12/14] sched: make dl_bw a sub-quota of rt_bw

On Tue, Oct 15, 2013 at 03:11:33PM +0200, Ingo Molnar wrote:
> The scheduler has over 800 #ifdefs or similar preprocessor directives:
> 
>   comet:~/tip> git grep '^#' kernel/sched/ | grep -v include | wc -l
>   855
> 
> I'd like to see this simplified a bit, _especially_ before we add new 
> complexity ...

I agree; however I also think its unfair to pile this on Juri. Esp the
avenue pushed here, which will increase UP text and (runtime) data
sizes, to which I think some people will still object.

There's this entire 'maker' community (aka. internet of things) now
using very small Linux devices. Think Raspberry-Pi, Intel Quark (however much
I hate Intel for shipping a new 32bit device) etc.

These people are wanting to run Linux on these tiny devices, with tiny
memories etc; we shouldn't make their life harder than it already is.

Also; you didn't object about the 29 new #ifdefs currently in
tip.

How about we use some of the 'quality' conference time in EDI to do some
big code shuffles to get rid of some of them. I'm sure we can reduce the
number of ifdeffery by simply merging various similar blocks and maybe
write a few extra helper functions.

This is how kernel/sched/ got created in the first place; as a means to
keep the fingers busy at a conference ;-)
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