Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935490Ab3DPDCa (ORCPT ); Mon, 15 Apr 2013 23:02:30 -0400 Received: from mail-pa0-f44.google.com ([209.85.220.44]:40477 "EHLO mail-pa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935212Ab3DPDC2 (ORCPT ); Mon, 15 Apr 2013 23:02:28 -0400 MIME-Version: 1.0 In-Reply-To: <20130415171429.GF3672@sgi.com> References: <20130415171225.GC3658@sgi.com> <20130415171429.GF3672@sgi.com> Date: Tue, 16 Apr 2013 11:02:27 +0800 Message-ID: Subject: Re: [Patch -v3 1/4] Migrate shutdown/reboot to boot cpu. From: Shawn Guo To: Robin Holt Cc: Ingo Molnar , Russ Anderson , Oleg Nesterov , Andrew Morton , "H. Peter Anvin" , Lai Jiangshan , Linus Torvalds , Linux Kernel Mailing List , Michel Lespinasse , "Paul E. McKenney" , Paul Mackerras , Peter Zijlstra , "rusty@rustcorp.com.au" , Tejun Heo , "the arch/x86 maintainers" , Thomas Gleixner Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1080 Lines: 25 On Mon, Apr 15, 2013 at 12:14:29PM -0500, Robin Holt wrote: > We recently noticed that reboot of a 1024 cpu machine takes approx 16 > minutes of just stopping the cpus. The slowdown was tracked to commit > f96972f. > > The current implementation does all the work of hot removing the cpus > before halting the system. We are switching to just migrating to the > boot cpu and then continuing with shutdown/reboot. > > This also has the effect of not breaking x86's command line parameter for > specifying the reboot cpu. Note, this code was shamelessly copied from > arch/x86/kernel/reboot.c with bits removed pertaining to the reboot_cpu > command line parameter. > > Signed-off-by: Robin Holt > To: Shawn Guo It works on my hardware - i.MX6 Quad. Tested-by: Shawn Guo -- 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/