From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752442AbdJDOQY (ORCPT ); Wed, 4 Oct 2017 10:16:24 -0400 Received: from mail-wm0-f46.google.com ([74.125.82.46]:46558 "EHLO mail-wm0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752420AbdJDOQX (ORCPT ); Wed, 4 Oct 2017 10:16:23 -0400 X-Google-Smtp-Source: AOwi7QB7Niv5bnWmQHOuo66AHi8HuPxL5Sy+uz1wf+Jsfcr31qb99mSclFjuFhlAdfalzCqZcU0qkQ== Date: Wed, 4 Oct 2017 17:16:20 +0300 From: "Kirill A. Shutemov" To: Michal Hocko Cc: "Kirill A. Shutemov" , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vlastimil Babka Subject: Re: [PATCHv3] mm: Account pud page tables Message-ID: <20171004141620.37qojkpftpmpgmxj@node.shutemov.name> References: <20171002080427.3320-1-kirill.shutemov@linux.intel.com> <20171004134853.k2f4bah7csh6qebm@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20171004134853.k2f4bah7csh6qebm@dhcp22.suse.cz> User-Agent: NeoMutt/20170609 (1.8.3) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 04, 2017 at 03:48:53PM +0200, Michal Hocko wrote: > On Mon 02-10-17 11:04:27, Kirill A. Shutemov wrote: > > On machine with 5-level paging support a process can allocate > > significant amount of memory and stay unnoticed by oom-killer and > > memory cgroup. The trick is to allocate a lot of PUD page tables. > > We don't account PUD page tables, only PMD and PTE. > > > > We already addressed the same issue for PMD page tables, see > > dc6c9a35b66b ("mm: account pmd page tables to the process"). > > Introduction 5-level paging bring the same issue for PUD page tables. > > > > The patch expands accounting to PUD level. > > Can we skip the VmPUD part and reporting puds in the oom report please? > I would like to consolidate all levels into a single counter and carying > about one less user visible change will make it slightly easier. Or does > anybody need this exported to the userspace? Let me do this as a separate patch. I will also fold VmPMD into VmPTE. -- Kirill A. Shutemov