Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753100AbXIDH1x (ORCPT ); Tue, 4 Sep 2007 03:27:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751679AbXIDH1q (ORCPT ); Tue, 4 Sep 2007 03:27:46 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.31.123]:45640 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751462AbXIDH1p (ORCPT ); Tue, 4 Sep 2007 03:27:45 -0400 Date: Tue, 4 Sep 2007 09:27:44 +0200 From: Pavel Machek To: Thomas Gleixner Cc: "Rafael J. Wysocki" , Jeff Chua , rusty@rustycorp.com.au, vatsa@in.ibm.com, zwane@arm.linux.org.uk, kernel list Subject: Re: cpu hotplug support broken in 2.6.23-rc3 Message-ID: <20070904072744.GA30474@atrey.karlin.mff.cuni.cz> References: <20070827104350.GA2073@elf.ucw.cz> <20070903034720.GB3655@ucw.cz> <200709031219.12846.rjw@sisk.pl> <1188822917.3406.0.camel@chaos> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1188822917.3406.0.camel@chaos> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1244 Lines: 30 > On Mon, 2007-09-03 at 12:19 +0200, Rafael J. Wysocki wrote: > > > Ok, so it gets weirder. I have now machine in "hung" state; other > > > consoles still work, but there are no timers - sleep 1 hangs forever. > > > > > > sysrq-t shows kstopmachine hung in hrtimer_try_to_cancel. > > > > > > So I indeed suspect difference-in-kconfig to trigger this, and will > > > try disabling noidlehz. > > > > I would unset CONFIG_HIGH_RES_TIMERS for starters. > > > > Well, I guess Thomas should know about that. ;-) > > What was the last known to work version ? I'm afraid I only turned on HIGH_RES_TIMERS in 2.6.23-rc1 timeframe... so I'm not sure if it ever worked for me. I can confirm it is working in 2.6.23-rc5 with highres disabled, and broken with highres enabled. NOHZ turns "waits for keypress during unplug/replug" into "just plain hangs". Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/