From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753345AbXC2Llf (ORCPT ); Thu, 29 Mar 2007 07:41:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753367AbXC2Llf (ORCPT ); Thu, 29 Mar 2007 07:41:35 -0400 Received: from ns1.suse.de ([195.135.220.2]:37316 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753345AbXC2Lle (ORCPT ); Thu, 29 Mar 2007 07:41:34 -0400 From: Andi Kleen Organization: SUSE Linux Products GmbH, Nuernberg, GF: Markus Rex, HRB 16746 (AG Nuernberg) To: Venki Pallipadi Subject: Re: [PATCH] Add support for deferrable timers (respun-Mar28) Date: Thu, 29 Mar 2007 13:41:12 +0200 User-Agent: KMail/1.9.5 Cc: Andrew Morton , Oleg Nesterov , linux-kernel , davej@codemonkey.org.uk, johnstul@us.ibm.com, mingo@elte.hu, tglx@linutronix.de References: <200703212353.l2LNrNOj007453@shell0.pdx.osdl.net> <20070328170159.7fc8c289.akpm@linux-foundation.org> <20070329005953.GA8764@linux-os.sc.intel.com> In-Reply-To: <20070329005953.GA8764@linux-os.sc.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200703291341.13172.ak@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > 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