From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751688Ab3CAKX6 (ORCPT ); Fri, 1 Mar 2013 05:23:58 -0500 Received: from cantor2.suse.de ([195.135.220.15]:53339 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750907Ab3CAKX5 (ORCPT ); Fri, 1 Mar 2013 05:23:57 -0500 Date: Fri, 1 Mar 2013 11:23:55 +0100 From: Michal Hocko To: David Rientjes Cc: akpm@linux-foundation.org, mm-commits@vger.kernel.org, dave@linux.vnet.ibm.com, mgorman@suse.de, linux-mm@kvack.org, LKML Subject: Re: + mm-show_mem-suppress-page-counts-in-non-blockable-contexts.patch added to -mm tree Message-ID: <20130301102355.GC21443@dhcp22.suse.cz> References: <20130228231025.9F11A5A410E@corp2gmr1-2.hot.corp.google.com> <20130301095716.GA21443@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri 01-03-13 02:15:04, David Rientjes wrote: > On Fri, 1 Mar 2013, Michal Hocko wrote: > > > I have already asked about it in the original thread but didn't get any > > answer. How can we get a soft lockup when all implementations of show_mem > > call touch_nmi_watchdog? > > > > Feel free to do s/soft lockups/irqs being disabled for an extremely long > time/. OK, that sounds better. Sorry for being so persistent on this but soft lockups tend to be a real issue for distribution kernels with !CONFIG_PREEMPT so anything that fixes soft lockups raises a red flag. Acked-by: Michal Hocko -- Michal Hocko SUSE Labs