linux-kernel - Re: [RFC PATCH 00/11] sched: CFS low-latency features

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Message-ID: <20100827195751.GA1030@Krystal>
Date:	Fri, 27 Aug 2010 15:57:51 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tony Lindgren <tony@...mide.com>,
	Mike Galbraith <efault@....de>
Subject: Re: [RFC PATCH 00/11] sched: CFS low-latency features

* Peter Zijlstra (peterz@...radead.org) wrote:
> On Fri, 2010-08-27 at 14:32 -0400, Mathieu Desnoyers wrote:
> > 
> > These are problems you get only when you allow spawning any number of threads.
> > If, instead, you create a thread pool at timer creation, then you can allow
> > concurrency without problems with spawner context and error proparation.
> 
> That would be a massive resource waste for the normal case where the
> interval > handler runtime.

Not if the application can configure this value. So the "normal" case could be
set to 1 single thread. Only resource-intensive apps would set this differently,
e.g. to the detected number of cpus.

Mathieu


-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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