linux-kernel - Re: [PATCH] Add support for deferrable timers (respun-Mar28)

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Message-Id: <7B0DEC32-4413-46CB-BB4D-DC6A1674F2EC@mac.com>
Date:	Thu, 29 Mar 2007 07:51:15 -0400
From:	Kyle Moffett <mrmacman_g4@....com>
To:	Andi Kleen <ak@...e.de>
Cc:	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...sign.ru>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	davej@...emonkey.org.uk, johnstul@...ibm.com, mingo@...e.hu,
	tglx@...utronix.de
Subject: Re: [PATCH] Add support for deferrable timers (respun-Mar28)

On Mar 29, 2007, at 07:41:12, Andi Kleen wrote:
>> ondemand is the biggest offender and the patch below reduces the  
>> number of interrupts by 50% or more (depending on HZ) on different  
>> test systems here.
>
> Cool!
>
>> Yes. There are quite a few other timers inside kernel that can be  
>> migrated. I will use timer_stats and track others and send in the  
>> patches soon.
>
> Longer term it might make sense to even expose this as a option to  
> user space. Maybe as a new timer in setitimer()? This might safe  
> power with "wiggling desktop applets" too.

Might also be useful to add an extra option to "top" to reduce the  
polling frequency if the system is otherwise idle.  A fixed 30-sec  
timer and a deferrable 1-sec timer or somesuch?

Cheers,
Kyle Moffett

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