linux-kernel - Re: [RFC PATCH] check_preempt_tick should not compare vruntime with wall time

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Message-ID: <AANLkTimB9CjH5SjeY9XmwhTp1tfFPwh-Q1Y4o918h7XD@mail.gmail.com>
Date:	Mon, 13 Sep 2010 09:36:56 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Lindgren <tony@...mide.com>,
	Mike Galbraith <efault@....de>
Subject: Re: [RFC PATCH] check_preempt_tick should not compare vruntime with
 wall time

On Mon, Sep 13, 2010 at 9:16 AM, Mathieu Desnoyers
<mathieu.desnoyers@...icios.com> wrote:
>
> OK, the long IRC discussions we just had convinced me that the current scheme
> takes things into account by adapting the granularity dynamically, but also got
> me to notice that check_preempt seems to compare vruntime with wall time, which
> is utterly incorrect. So maybe all my patch was doing was to expose this bug:

Do you have latency numbers for this patch?

                    Linus
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