From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ed1-f72.google.com (mail-ed1-f72.google.com [209.85.208.72]) by kanga.kvack.org (Postfix) with ESMTP id 8718C6B0003 for ; Sun, 22 Jul 2018 19:34:40 -0400 (EDT) Received: by mail-ed1-f72.google.com with SMTP id z5-v6so128864edr.19 for ; Sun, 22 Jul 2018 16:34:40 -0700 (PDT) Received: from mail.nethype.de (mail.nethype.de. [5.9.56.24]) by mx.google.com with ESMTPS id w44-v6si5939584edb.165.2018.07.22.16.34.38 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 22 Jul 2018 16:34:39 -0700 (PDT) Date: Mon, 23 Jul 2018 01:34:37 +0200 From: Marc Lehmann Subject: Re: post linux 4.4 vm oom kill, lockup and thrashing woes Message-ID: <20180722233437.34e5ckq5pp24gsod@schmorp.de> References: <20180710120755.3gmin4rogheqb3u5@schmorp.de> <20180710123222.GK14284@dhcp22.suse.cz> <20180717234549.4ng2expfkgaranuq@schmorp.de> <20180718083808.GR7193@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180718083808.GR7193@dhcp22.suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: linux-mm@kvack.org On Wed, Jul 18, 2018 at 10:38:08AM +0200, Michal Hocko wrote: > > http://data.plan9.de/kvm_oom.txt > > That is something to bring up with kvm guys. Order-6 pages are > considered costly and success of the allocation is by no means > guaranteed. Unike for orders smaller than 4 they do not trigger the oom > killer though. So 4 is the magic barrier, good to know. In any case, as I said, it's just an example of various allocations that fail unexpectedly after 4.4, and it's by no means just nvidia. > vmalloc fallback would be a good alternative. Unfortunatelly I am not > able to find which allocation is that. What does faddr2line kvm_dev_ioctl_create_vm+0x40 > say? I suspect I can't run this for an installed kernel without sources/object files? In this case a precompiled kernel from ubuntu mainline-ppa. Running faddr2line kvm.ko ... just gives me: kvm_dev_ioctl_create_vm+0x40/0x5d1: kvm_dev_ioctl_create_vm at ??:? -- The choice of a Deliantra, the free code+content MORPG -----==- _GNU_ http://www.deliantra.net ----==-- _ generation ---==---(_)__ __ ____ __ Marc Lehmann --==---/ / _ \/ // /\ \/ / schmorp@schmorp.de -=====/_/_//_/\_,_/ /_/\_\