From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-f71.google.com (mail-lf0-f71.google.com [209.85.215.71]) by kanga.kvack.org (Postfix) with ESMTP id 5CBF06B0260 for ; Wed, 30 Nov 2016 12:41:25 -0500 (EST) Received: by mail-lf0-f71.google.com with SMTP id g12so45057398lfe.5 for ; Wed, 30 Nov 2016 09:41:25 -0800 (PST) Received: from mail.setcomm.ru (mail.setcomm.ru. [81.211.32.179]) by mx.google.com with ESMTP id e9si32240722lji.62.2016.11.30.09.41.23 for ; Wed, 30 Nov 2016 09:41:23 -0800 (PST) Reply-To: bb@kernelpanic.ru Subject: Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink_node` 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> From: Boris Zhmurov Message-ID: <66fd50e1-a922-846a-f427-7654795bd4b5@kernelpanic.ru> Date: Wed, 30 Nov 2016 20:41:20 +0300 MIME-Version: 1.0 In-Reply-To: <20161128150509.GG3924@linux.vnet.ibm.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: paulmck@linux.vnet.ibm.com Cc: Michal Hocko , Paul Menzel , Donald Buczek , linux-mm@kvack.org Paul E. McKenney 28/11/16 18:05: >>>> 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! Well, after some testing I may say, that your patch: ---------------------8<----------------------------------- commit 7cebc6b63bf75db48cb19a94564c39294fd40959 Author: Paul E. McKenney Date: Fri Nov 25 12:48:10 2016 -0800 mm: Prevent shrink_node_memcg() RCU CPU stall warnings ---------------------8<----------------------------------- fixes stall warning and dmesg is clean now. -- Boris Zhmurov System/Network Administrator mailto: bb@kernelpanic.ru "wget http://kernelpanic.ru/bb_public_key.pgp -O - | gpg --import" -- 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