From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750992AbXD1Hqj (ORCPT ); Sat, 28 Apr 2007 03:46:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751674AbXD1Hqj (ORCPT ); Sat, 28 Apr 2007 03:46:39 -0400 Received: from e34.co.us.ibm.com ([32.97.110.152]:36361 "EHLO e34.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750968AbXD1Hqh (ORCPT ); Sat, 28 Apr 2007 03:46:37 -0400 Date: Sat, 28 Apr 2007 13:15:33 +0530 From: Gautham R Shenoy To: Andrew Morton Cc: "Rafael J. Wysocki" , Ingo Molnar , Oleg Nesterov , Pavel Machek , Pekka Enberg , LKML Subject: Re: [PATCH -mm] Allow selective freezing of the system for different events Message-ID: <20070428074533.GA15607@in.ibm.com> Reply-To: ego@in.ibm.com References: <200704271737.31192.rjw@sisk.pl> <200704271740.17972.rjw@sisk.pl> <20070428013446.GA20242@in.ibm.com> <20070427232222.1ea7797d.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070427232222.1ea7797d.akpm@linux-foundation.org> User-Agent: Mutt/1.5.12-2006-07-14 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Apr 27, 2007 at 11:22:22PM -0700, Andrew Morton wrote: > On Sat, 28 Apr 2007 07:04:46 +0530 Gautham R Shenoy wrote: > > > This patch > > * Provides an interface to selectively freeze the system for different events. > > * Allows tasks to exempt themselves or other tasks from specific freeze > > events. > > * Allow nesting of freezer calls. For eg: > > > > freeze_processes(EVENT_A); > > /* Do something with respect to event A */ > > . > > . > > . > > freeze_processes(EVENT_B); > > /* Do something with respect to event B */ > > . > > . > > . > > thaw_processes(EVENT_B); > > . > > . > > . > > thaw_processes(EVENT_B); > > > > This type of behaviour would be required when cpu hotplug would start > > using the process freezer, where EVENT_A would be SUSPEND and EVENT_B > > would be HOTPLUG_CPU. > > > > This patch applies on the top of 2.6.21-rc7-mm2 + Rafael's freezer > > changes from http://lkml.org/lkml/2007/4/27/302. > > I think I'll duck this. We have more than enough kthread/freezer/etc work > queued for 2.6.22. Sure, not a problem :-) I just wanted to get a sense, if this was a right way to do it. Besides, I am plannning to send it again once I port the cpuhotplug patches on top of all these changes and get some satisfactory numbers. > Let's please for now concentrate on reviewing and > testing the existing changes. Once that has all landed and settled in, > let's start thinking about the next round. > Ok. Thanks and Regards gautham. -- Gautham R Shenoy Linux Technology Center IBM India. "Freedom comes with a price tag of responsibility, which is still a bargain, because Freedom is priceless!"