From mboxrd@z Thu Jan  1 00:00:00 1970
From: aaro.koskinen@nokia.com (Aaro Koskinen)
Date: Mon, 28 Sep 2009 13:44:26 +0300
Subject: [PATCH 2/2] n2100: reduce power button timer to 1 Hz
In-Reply-To: <19136.36934.791249.535941@pilspetsen.it.uu.se>
References: <19134.29011.460366.960746@pilspetsen.it.uu.se>	<4AC06E8C.8090908@nokia.com>
	<19136.36934.791249.535941@pilspetsen.it.uu.se>
Message-ID: <4AC0938A.1040009@nokia.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Hello,

Mikael Pettersson wrote:
> Aaro Koskinen writes:
>  > Mikael Pettersson wrote:
>  > > 10 Hz seems excessive, so this patch adds a compile-time option
>  > > to reduce the polling frequency to 1 Hz.
>  > > 
>  > > (This change could possibly be handled via a kernel boot option,
>  > > or even be made unconditional, but I opted for a compile-time
>  > > option for now.)
>  > 
>  > I don't think there is need to have an option for this. With HZ also
>  > round_jiffies() could be used, it doesn't need to be exact.
> 
> I don't quite follow you here. Can you elaborate?

round_jiffies() rounds the time up or down to a full second. It's useful for
timers that expire every N seconds. This way timeouts can be grouped, so there
is less wakeups.

A.