From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f72.google.com (mail-wm0-f72.google.com [74.125.82.72]) by kanga.kvack.org (Postfix) with ESMTP id C5249280254 for ; Tue, 29 Nov 2016 13:59:27 -0500 (EST) Received: by mail-wm0-f72.google.com with SMTP id m203so46234415wma.2 for ; Tue, 29 Nov 2016 10:59:27 -0800 (PST) Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com. [148.163.158.5]) by mx.google.com with ESMTPS id cc1si60650337wjc.168.2016.11.29.10.59.26 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 29 Nov 2016 10:59:26 -0800 (PST) Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id uATIx0lB066040 for ; Tue, 29 Nov 2016 13:59:25 -0500 Received: from e35.co.us.ibm.com (e35.co.us.ibm.com [32.97.110.153]) by mx0a-001b2d01.pphosted.com with ESMTP id 271bxcpdxb-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 29 Nov 2016 13:59:25 -0500 Received: from localhost by e35.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 29 Nov 2016 11:59:24 -0700 Date: Tue, 29 Nov 2016 10:59:21 -0800 From: "Paul E. McKenney" Subject: Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` Reply-To: paulmck@linux.vnet.ibm.com References: <20161124133019.GE3612@linux.vnet.ibm.com> <20161125212000.GI31360@linux.vnet.ibm.com> <20161128095825.GI14788@dhcp22.suse.cz> <20161128105425.GY31360@linux.vnet.ibm.com> <3a4242cb-0198-0a3b-97ae-536fb5ff83ec@kernelpanic.ru> <20161128143435.GC3924@linux.vnet.ibm.com> <20161128150509.GG3924@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Message-Id: <20161129185921.GA14183@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Boris Zhmurov Cc: Michal Hocko , Paul Menzel , Donald Buczek , linux-mm@kvack.org On Mon, Nov 28, 2016 at 10:16:33PM +0300, Boris Zhmurov wrote: > Paul E. McKenney 28/11/16 18:05: > > On Mon, Nov 28, 2016 at 05:40:48PM +0300, Boris Zhmurov wrote: > >> Paul E. McKenney 28/11/16 17:34: > >> > >> > >>>> So Paul, I've dropped "mm: Prevent shrink_node_memcg() RCU CPU stall > >>>> warnings" patch, and stalls got back (attached). > >>>> > >>>> With this patch "commit 7cebc6b63bf75db48cb19a94564c39294fd40959" from > >>>> your tree stalls gone. Looks like that. > >>> > >>> So with only this commit and no other commit or configuration adjustment, > >>> everything works? Or it the solution this commit and some other stuff? > >>> > >>> The reason I ask is that if just this commit does the trick, I should > >>> drop the others. > >> > >> I'd like to ask for some more time to make sure this is it. > >> Approximately 2 or 3 days. > > > > Works for me! > > > > Thanx, Paul > > > FYI. > Some more stalls with mm-prevent-shrink_node-RCU-CPU-stall-warning.patch > and without mm-prevent-shrink_node_memcg-RCU-CPU-stall-warnings.patch. Thank you for the info! Is this one needed? 2d66cccd7343 ("mm: Prevent __alloc_pages_nodemask() RCU CPU stall warnings") It is causing trouble in other tests. If it is needed, I must fix it, if not, I can happily drop it. ;-) Thanx. Paul -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org