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 886C0ECDE20 for ; Wed, 11 Sep 2019 13:51:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 47B26207FC for ; Wed, 11 Sep 2019 13:51:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568209872; bh=r+zd+6XsncKue9x4bc4AS0UzZKNWFvb843NAY/jWmak=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=vr3iRBf9hl4tPdEulxZ/2h1GfouQSoeXwaz4/Z3YUZ+NNgsZjYX0JPzOuoILA7U3b rjFstVhQVcDm7MffA7j9FKxVNr6vnBL9+Un5hYE3YCScF9iLD4TLPkad6MtWeuEDF8 Ayi28FhuImsdSLC63q39S/YaV+zjTgwqSh4r97Ug= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728071AbfIKNvE (ORCPT ); Wed, 11 Sep 2019 09:51:04 -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: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@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