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

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Message-Id: <200703291341.13172.ak@suse.de>
Date:	Thu, 29 Mar 2007 13:41:12 +0200
From:	Andi Kleen <ak@...e.de>
To:	Venki Pallipadi <venkatesh.pallipadi@...el.com>
Cc:	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)


> 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.

-Andi

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