linux-kernel - Re: [RFC patch 1/2] sched: dynamically adapt granularity with nr

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Message-ID: <1284385967.17152.13.camel@gandalf.stny.rr.com>
Date:	Mon, 13 Sep 2010 09:52:47 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mike Galbraith <efault@....de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [RFC patch 1/2] sched: dynamically adapt granularity with
 nr_running

On Mon, 2010-09-13 at 10:41 +0200, Peter Zijlstra wrote:

> Yeah, without it you can starve the already running task on massive
> forks.
> 
> Still, I'm not quite sure why people really care about fork() on time
> sensitive paths, its a very expensive thing to do, pre-fork() and wake
> when you need it, is what I would say.

Fork is used all over the place in Linux. Every shell script uses it to
execute commands. Bad fork behavior shows up in just doing a build of
the kernel.

-- Steve



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