linux-kernel - Re: [patch 20/23] add /proc/sys/kernel/timeout

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Message-Id: <20060930014541.9674fe79.akpm@osdl.org>
Date:	Sat, 30 Sep 2006 01:45:41 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Jim Gettys <jg@...top.org>, John Stultz <johnstul@...ibm.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: [patch 20/23] add /proc/sys/kernel/timeout_granularity

On Fri, 29 Sep 2006 23:58:39 -0000
Thomas Gleixner <tglx@...utronix.de> wrote:

> From: Ingo Molnar <mingo@...e.hu>
> 
> Introduce timeout granularity: process timer wheel timers every
> timeout_granularity jiffies. Defaults to 1 (process timers HZ times
> per second - most finegrained).
> 
> ...
>
> +	timeout_granularity=
> +			[KNL]
> +			Timeout granularity: process timer wheel timers every
> +			timeout_granularity jiffies. Defaults to 1 (process
> +			timers HZ times per second - most finegrained).
> +

Please do not expose HZ to userspace in this fashion.  It means that an
application which was developed and tested on a 1000Hz kernel might fail on a
250Hz kernel.

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