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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no 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 02759C49ED6 for ; Wed, 11 Sep 2019 13:51:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BC665206CD for ; Wed, 11 Sep 2019 13:51:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568209865; bh=r+zd+6XsncKue9x4bc4AS0UzZKNWFvb843NAY/jWmak=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=dxFN3MUNG0G3NMtyxl41ter0ItUEcSXe+d8MAd3DgiOrl0V8KxtulZJpqvZqwalPy QYO0SXv9uT+c2+OkITV667yUHRHfOUDzCRnlvUqdSL8BMP6qsxIvGhC1C1OBoCLTUc yd7CfA3Xh+w3hhE1IkNPxmniz3aVcMoMTLDJNB70= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728163AbfIKNvF (ORCPT ); Wed, 11 Sep 2019 09:51:05 -0400 Received: from mx2.suse.de ([195.135.220.15]:55284 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726781AbfIKNvE (ORCPT ); Wed, 11 Sep 2019 09:51:04 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 81F1EC07E; Wed, 11 Sep 2019 13:51:02 +0000 (UTC) Date: Wed, 11 Sep 2019 15:51:00 +0200 From: Michal Hocko To: David Hildenbrand Cc: "Michael S. Tsirkin" , Alexander Duyck , Alexander Duyck , virtio-dev@lists.oasis-open.org, kvm list , Catalin Marinas , Dave Hansen , LKML , Matthew Wilcox , linux-mm , Andrew Morton , will@kernel.org, linux-arm-kernel@lists.infradead.org, Oscar Salvador , Yang Zhang , Pankaj Gupta , Konrad Rzeszutek Wilk , Nitesh Narayan Lal , Rik van Riel , lcapitulino@redhat.com, "Wang, Wei W" , Andrea Arcangeli , ying.huang@intel.com, Paolo Bonzini , Dan Williams , Fengguang Wu , "Kirill A. Shutemov" Subject: Re: [PATCH v9 0/8] stg mail -e --version=v9 \ Message-ID: <20190911135100.GC4023@dhcp22.suse.cz> References: <20190910175213.GD4023@dhcp22.suse.cz> <1d7de9f9f4074f67c567dbb4cc1497503d739e30.camel@linux.intel.com> <20190911113619.GP4023@dhcp22.suse.cz> <20190911080804-mutt-send-email-mst@kernel.org> <20190911121941.GU4023@dhcp22.suse.cz> <20190911122526.GV4023@dhcp22.suse.cz> <4748a572-57b3-31da-0dde-30138e550c3a@redhat.com> <20190911125413.GY4023@dhcp22.suse.cz> <736594d6-b9ae-ddb9-2b96-85648728ef33@redhat.com> <20190911132002.GA4023@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190911132002.GA4023@dhcp22.suse.cz> 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 Wed 11-09-19 15:20:02, Michal Hocko wrote: [...] > > 4. Continuously report, not the "one time report everything" approach. > > So you mean the allocator reporting this rather than an external code to > poll right? I do not know, how much this is nice to have than must have? Another idea that I haven't really thought through so it might turned out to be completely bogus but let's try anyway. Your "report everything" just made me look and realize that free_pages_prepare already performs stuff that actually does something similar yet unrelated. We do report to special page poisoning, zeroying or CONFIG_DEBUG_PAGEALLOC to unmap the address from the kernel address space. This sounds like something fitting your model no? -- Michal Hocko SUSE Labs 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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=no 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 44F24C49ED6 for ; Wed, 11 Sep 2019 13:51:14 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 14EEE207FC for ; Wed, 11 Sep 2019 13:51:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="bDR+4Uue" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 14EEE207FC 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-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=CO0YvKOGRgvKDJS2aeNdYyjq6WkOm8CK6e172pxKoRk=; b=bDR+4Uue+pWqha GStalCLW1lz4l/CZ2BEMaPt2DZwuKPdwN/Lu/q+JuwoKM+yEnGdlNTwFFWN6WuHGvd7cMDd+QA3jT mazk4nK6e/FdQtSfCYiJAW+VUTprGWX8Kt5lFaAAIsYBSjUIufzkn95BJ/F78iN1r7rBYS79xldWO EPqf0AGM9r+8ErAIdra+BpuOB6okslVt8JZ6+9XZH53pM1yFY6ZMDf7FPGn5LSoLHnG/aFyMaKoaD vwNPFa1GIltHtfIGS7y54XVBNjBXY5HmaRbPBl45sBd3JRQKtN9Miq42qQ41DXjoGDD2fS9e1DQxh gCXaf+CgPnTec3JDtU0Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1i831Y-0002XW-AB; Wed, 11 Sep 2019 13:51:08 +0000 Received: from mx2.suse.de ([195.135.220.15] helo=mx1.suse.de) by bombadil.infradead.org with esmtps (Exim 4.92.2 #3 (Red Hat Linux)) id 1i831U-0002XA-7u for linux-arm-kernel@lists.infradead.org; Wed, 11 Sep 2019 13:51:05 +0000 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 81F1EC07E; Wed, 11 Sep 2019 13:51:02 +0000 (UTC) Date: Wed, 11 Sep 2019 15:51:00 +0200 From: Michal Hocko To: David Hildenbrand Subject: Re: [PATCH v9 0/8] stg mail -e --version=v9 \ Message-ID: <20190911135100.GC4023@dhcp22.suse.cz> References: <20190910175213.GD4023@dhcp22.suse.cz> <1d7de9f9f4074f67c567dbb4cc1497503d739e30.camel@linux.intel.com> <20190911113619.GP4023@dhcp22.suse.cz> <20190911080804-mutt-send-email-mst@kernel.org> <20190911121941.GU4023@dhcp22.suse.cz> <20190911122526.GV4023@dhcp22.suse.cz> <4748a572-57b3-31da-0dde-30138e550c3a@redhat.com> <20190911125413.GY4023@dhcp22.suse.cz> <736594d6-b9ae-ddb9-2b96-85648728ef33@redhat.com> <20190911132002.GA4023@dhcp22.suse.cz> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190911132002.GA4023@dhcp22.suse.cz> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190911_065104_430956_FA4A1C7A X-CRM114-Status: GOOD ( 10.78 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Yang Zhang , Pankaj Gupta , kvm list , "Michael S. Tsirkin" , Catalin Marinas , Alexander Duyck , lcapitulino@redhat.com, linux-mm , Alexander Duyck , will@kernel.org, Andrea Arcangeli , virtio-dev@lists.oasis-open.org, Rik van Riel , Matthew Wilcox , "Wang, Wei W" , ying.huang@intel.com, Konrad Rzeszutek Wilk , Dan Williams , linux-arm-kernel@lists.infradead.org, Oscar Salvador , Nitesh Narayan Lal , Dave Hansen , LKML , Paolo Bonzini , Andrew Morton , Fengguang Wu , "Kirill A. Shutemov" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed 11-09-19 15:20:02, Michal Hocko wrote: [...] > > 4. Continuously report, not the "one time report everything" approach. > > So you mean the allocator reporting this rather than an external code to > poll right? I do not know, how much this is nice to have than must have? Another idea that I haven't really thought through so it might turned out to be completely bogus but let's try anyway. Your "report everything" just made me look and realize that free_pages_prepare already performs stuff that actually does something similar yet unrelated. We do report to special page poisoning, zeroying or CONFIG_DEBUG_PAGEALLOC to unmap the address from the kernel address space. This sounds like something fitting your model no? -- Michal Hocko SUSE Labs _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel