From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B0D81C433F5 for ; Thu, 6 Sep 2018 17:08:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7425320652 for ; Thu, 6 Sep 2018 17:08:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7425320652 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729309AbeIFVok (ORCPT ); Thu, 6 Sep 2018 17:44:40 -0400 Received: from mx2.suse.de ([195.135.220.15]:53360 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728603AbeIFVok (ORCPT ); Thu, 6 Sep 2018 17:44:40 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 04E32AEF2; Thu, 6 Sep 2018 17:08:14 +0000 (UTC) Date: Thu, 6 Sep 2018 19:08:13 +0200 From: Michal Hocko 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 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> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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