From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf1-f200.google.com (mail-pf1-f200.google.com [209.85.210.200]) by kanga.kvack.org (Postfix) with ESMTP id CC60E6B79CA for ; Thu, 6 Sep 2018 13:08:17 -0400 (EDT) Received: by mail-pf1-f200.google.com with SMTP id o27-v6so6140250pfj.6 for ; Thu, 06 Sep 2018 10:08:17 -0700 (PDT) Received: from mx1.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id p2-v6si5695760pfd.76.2018.09.06.10.08.15 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 06 Sep 2018 10:08:15 -0700 (PDT) Date: Thu, 6 Sep 2018 19:08:13 +0200 From: Michal Hocko Subject: Re: [PATCH v2 1/2] mm: Move page struct poisoning to CONFIG_DEBUG_VM_PAGE_INIT_POISON Message-ID: <20180906170813.GF14951@dhcp22.suse.cz> References: <20180905211041.3286.19083.stgit@localhost.localdomain> <20180905211328.3286.71674.stgit@localhost.localdomain> <20180906054735.GJ14951@dhcp22.suse.cz> <0c1c36f7-f45a-8fe9-dd52-0f60b42064a9@intel.com> <20180906151336.GD14951@dhcp22.suse.cz> <33f39b37-9567-88a8-097d-a63df04c7732@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <33f39b37-9567-88a8-097d-a63df04c7732@intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Dave Hansen Cc: Alexander Duyck , linux-mm@kvack.org, linux-kernel@vger.kernel.org, alexander.h.duyck@intel.com, pavel.tatashin@microsoft.com, akpm@linux-foundation.org, mingo@kernel.org, kirill.shutemov@linux.intel.com On Thu 06-09-18 09:09:46, Dave Hansen wrote: [...] > Has anyone ever seen a single in-the-wild report from this mechanism? Yes. See the list from Pavel. And I wouldn't push for it otherwise. There are some questionable asserts with an overhead which is not directly visible but it just adds up. This is different that it is one time boot rare thing. Anyway, I guess I have put all my arguments on the table. I will leave the decision to you guys. If there is a strong concensus about a config option, then I can live with that and will enable it. -- Michal Hocko SUSE Labs