Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751308AbZIAP7L (ORCPT ); Tue, 1 Sep 2009 11:59:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750885AbZIAP7J (ORCPT ); Tue, 1 Sep 2009 11:59:09 -0400 Received: from smtp2.ultrahosting.com ([74.213.174.253]:45218 "EHLO smtp.ultrahosting.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750718AbZIAP7I (ORCPT ); Tue, 1 Sep 2009 11:59:08 -0400 Date: Tue, 1 Sep 2009 15:56:56 -0400 (EDT) From: Christoph Lameter X-X-Sender: cl@V090114053VZO-1 To: Josh Triplett cc: linux-kernel@vger.kernel.org, Anton Blanchard , Tim Pepper , Paul McKenney , John Stultz , Jamey Sharp Subject: Re: [RFC PATCH] Turn off the tick even when not idle In-Reply-To: <20090901154327.GA10024@feather> Message-ID: References: <20090901154327.GA10024@feather> User-Agent: Alpine 1.10 (DEB 962 2008-03-14) MIME-Version: 1.0 Content-Type: MULTIPART/Mixed; BOUNDARY=IS0zKkzwUGydFO0o Content-ID: Content-Disposition: INLINE Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11193 Lines: 171 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --IS0zKkzwUGydFO0o Content-Type: TEXT/PLAIN; CHARSET=US-ASCII Content-ID: Content-Disposition: INLINE On Tue, 1 Sep 2009, Josh Triplett wrote: > Please, give this patch a try and let me know what you think. Looks quite good. The PNG shows more deterministic run time behavior. > I'd like to work towards a patch which really can kill off the timer > tick, making the kernel entirely event-driven and removing the polling > that occurs in the timer tick. I've reviewed everything the timer tick > does, and every last bit of it could occur using an event-driven > approach. Good idea. Thought so for a long time. Thanks for working on it. Many of the events can be deferred if nothing is happening in the system. vm statistics, data expiration from caches etc. Not sure what to do about the per cpu threads generated by various kernel subsystems though. --IS0zKkzwUGydFO0o Content-Type: IMAGE/PNG; CHARSET=US-ASCII Content-Transfer-Encoding: BASE64 Content-ID: Content-Description: Content-Disposition: ATTACHMENT; FILENAME=nohz-hack.png iVBORw0KGgoAAAANSUhEUgAAAoAAAAHgCAMAAAACDyzWAAABPlBMVEX///8AAACgoKD/AAAA wAAAgP/AAP8A7u7AQADu7gAgIMD/wCAAgECggP+AQAD/gP8AwGAAwMAAYIDAYIAAgABA/4Aw YICAYABAQEBAgAAAAICAYBCAYGCAYIAAAMAAAP8AYADjsMBAwIBgoMBgwABgwKCAAACAAIBg IIBgYGAgICAgQEAgQIBggCBggGBggICAgEAggCCAgICgoKCg0ODAICAAgIDAYACAwODAYMDA gADAgGD/QAD/QECAwP//gGD/gIDAoADAwMDA/8D/AAD/AP//gKDAwKD/YGAA/wD/gAD/oACA 4OCg4OCg/yDAAADAAMCgICCgIP+AIACAICCAQCCAQICAYMCAYP+AgADAwAD/gED/oED/oGD/ oHD/wMD//wD//4D//8BfX18fHx+fn58/Pz/f39+/v79/f3+KAlHbAAAaR0lEQVR4nO2dCZqk KhCE5RvrpC5Y97/ACG6gaKHpEtjxz7SPtqiu7Ml4rEmaZYQQQgghhBBCCCGEEEIIIYQQQggh 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