linux-kernel - Re: [PATCH] [RSDL-0.30] sched: rsdl improve latencies with differential nice -1

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Date:	Wed, 14 Mar 2007 07:58:29 +1100
From:	Con Kolivas <kernel@...ivas.org>
To:	Al Boldi <a1426z@...ab.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, ck list <ck@....kolivas.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RSDL-0.30] sched: rsdl improve latencies with differential nice -1

On Wednesday 14 March 2007 03:03, Con Kolivas wrote:
> On Wednesday 14 March 2007 02:31, Con Kolivas wrote:
> > On Monday 12 March 2007 22:26, Al Boldi wrote:
> > > I think, it should be possible to spread this max expiration latency
> > > across the rotation, should it not?
> >
> > Can you try the attached patch please Al and Mike? It "dithers" the
> > priority bitmap which tends to fluctuate the latency a lot more but in a
> > cyclical fashion. This tends to make the max latency bound to a smaller
> > value and should make it possible to run -nice tasks without killing the
> > latency of the non niced tasks. Eg you could possibly run X nice -10 at a
> > guess like we used to in 2.4 days. It's not essential of course, but is a
> > workaround for Mike's testcase.
>
> Oops, one tiny fix. This is a respin of the patch, sorry.
> ---

Bah with a bit more sleep under my belt it became clear that I forgot to 
update the expired array in any proper way so this change almost breaks stuff 
at the moment in the shape it's in. Please disregard this change for now 
apart from interest in how I'm tackling the nice issue.

-- 
-ck
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