linux-kernel - Re: Renice X for cpu schedulers

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Date:	Tue, 24 Apr 2007 11:23:00 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Ray Lee <ray@...rabbit.org>
Cc:	Nick Piggin <npiggin@...e.de>, ray-gmail@...rabbit.org,
	Con Kolivas <kernel@...ivas.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	William Lee Irwin III <wli@...omorphy.com>,
	Peter Williams <pwil3058@...pond.net.au>,
	Mike Galbraith <efault@....de>, ck list <ck@....kolivas.org>,
	Bill Huey <billh@...ppy.monkey.org>,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Renice X for cpu schedulers

On Tue, Apr 24, 2007 at 08:50:20AM -0700, Ray Lee wrote:
> > Firstly, lots of clients in your list are remote. X usually isn't.
> 
> They really aren't, unless you happen to work somewhere that can afford
> to dedicate a box to a db, which suddenly makes the scheduler a dull
> topic.
> 
> For example, I have a db and web server installed on my laptop, so
> that the few times that I have to do web app programming (while wearing
> a mustache and glasses so that I don't have to admit to it in polite
> company), I can be functional with just one computer.

Indeed. The vast majority of people doing "LAMP" web services are
doing it on a single machine. Or VM for that matter.

It seems that this is a lot like the priority inheritance problem. If
a nice -19 process blocks on the db running at nice 0, the db ought to
get a boost until it wakes the original process up. The same should
apply at the level of dynamic priorities at the same nice level.

-- 
Mathematics is the supreme nostalgia of our time.
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