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_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 7AF53ECDE20 for ; Wed, 11 Sep 2019 13:51:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2053221479 for ; Wed, 11 Sep 2019 13:51:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2053221479 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 63ABC6B0005; Wed, 11 Sep 2019 09:51:05 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5EB3A6B0006; Wed, 11 Sep 2019 09:51:05 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4DAF06B0007; Wed, 11 Sep 2019 09:51:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0062.hostedemail.com [216.40.44.62]) by kanga.kvack.org (Postfix) with ESMTP id 27D6E6B0005 for ; Wed, 11 Sep 2019 09:51:05 -0400 (EDT) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id D356C180AD801 for ; Wed, 11 Sep 2019 13:51:04 +0000 (UTC) X-FDA: 75922776048.24.egg41_7dcca8eba3459 X-HE-Tag: egg41_7dcca8eba3459 X-Filterd-Recvd-Size: 3104 Received: from mx1.suse.de (mx2.suse.de [195.135.220.15]) by imf14.hostedemail.com (Postfix) with ESMTP for ; Wed, 11 Sep 2019 13:51:04 +0000 (UTC) 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) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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