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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 993F3C433E9 for ; Mon, 4 Jan 2021 15:34:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7C7D7224DE for ; Mon, 4 Jan 2021 15:34:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727957AbhADPdt (ORCPT ); Mon, 4 Jan 2021 10:33:49 -0500 Received: from mx2.suse.de ([195.135.220.15]:53894 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727489AbhADPdr (ORCPT ); Mon, 4 Jan 2021 10:33:47 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1609774381; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Q9W6ynCBWCE9iblo+eEtY1owmDUUUf1gpZxO3U/daYs=; b=Cqr6pN1N5LRWD+oWfPTF3jBAm0F27KO3A3Dxb26G3iV9TtqwO7MknLSUgnuMSIFqbOJ/G/ 84e3FQ3e4vv60SQ+CaWGNfen91m0uKsWwuZ/cN+m9mAZAAKVCLbTIe834yGwGVxAfIhWZX THnpgAkC5xX0DNOOrYn0lmMuAueuQO8= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 835F4B73F; Mon, 4 Jan 2021 15:33:01 +0000 (UTC) Date: Mon, 4 Jan 2021 16:33:00 +0100 From: Michal Hocko To: David Hildenbrand Cc: Dan Williams , linux-mm@kvack.org, LKML , Oscar Salvador Subject: Re: uninitialized pmem struct pages Message-ID: <20210104153300.GL13207@dhcp22.suse.cz> References: <20210104100323.GC13207@dhcp22.suse.cz> <033e1cd6-9762-5de6-3e88-47d3038fda7f@redhat.com> <20210104142624.GI13207@dhcp22.suse.cz> <23a4eea2-9fdb-fd1d-ee92-9cd8ac6e8f41@redhat.com> <20210104151005.GK13207@dhcp22.suse.cz> <26db2c3e-10c7-c6e3-23f7-21eb5101b31a@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <26db2c3e-10c7-c6e3-23f7-21eb5101b31a@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon 04-01-21 16:15:23, David Hildenbrand wrote: > On 04.01.21 16:10, Michal Hocko wrote: [...] > Do the physical addresses you see fall into the same section as boot > memory? Or what's around these addresses? Yes I am getting a garbage for the first struct page belonging to the pmem section [1] [ 0.020161] ACPI: SRAT: Node 0 PXM 0 [mem 0x100000000-0x603fffffff] [ 0.020163] ACPI: SRAT: Node 4 PXM 4 [mem 0x6060000000-0x11d5fffffff] non-volatile The pfn without the initialized struct page is 0x6060000. This is a first pfn in a section. --- [1] it shares the same memory block with the regular memory as those are in the same 2G range. -- Michal Hocko SUSE Labs