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

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Message-ID: <20100913142123.GA5056@elte.hu>
Date:	Mon, 13 Sep 2010 16:21:23 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	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>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [RFC patch 1/2] sched: dynamically adapt granularity with
 nr_running


* Peter Zijlstra <peterz@...radead.org> wrote:

> IIRC kbuild likes the child to be late, it allows make to spawn more 
> kids and it'll got sleep on completion once it done anyway.

Yes - and this is especially true on "make -j<nr_cpus>" types of 
borderline workloads - the scheduling policy with the highest effective 
parallelism wins.

Thanks,

	Ingo
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