From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-6.0 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham autolearn_force=no version=3.4.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id 2699D7D089 for ; Fri, 4 Jan 2019 02:28:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726178AbfADC2b (ORCPT ); Thu, 3 Jan 2019 21:28:31 -0500 Received: from mx1.redhat.com ([209.132.183.28]:59688 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726163AbfADC2b (ORCPT ); Thu, 3 Jan 2019 21:28:31 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4B81258E27; Fri, 4 Jan 2019 02:28:31 +0000 (UTC) Received: from localhost.localdomain (ovpn-12-85.pek2.redhat.com [10.72.12.85]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 47D595C223; Fri, 4 Jan 2019 02:28:23 +0000 (UTC) Subject: Re: [PATCH 1/2 v4] kdump: add the vmcoreinfo documentation To: Kazuhito Hagio Cc: "bhe@redhat.com" , "linux-doc@vger.kernel.org" , "x86@kernel.org" , "kexec@lists.infradead.org" , "mingo@redhat.com" , "bp@alien8.de" , "tglx@linutronix.de" , "dyoung@redhat.com" , "akpm@linux-foundation.org" , "linux-kernel@vger.kernel.org" References: <20181220054044.30738-1-lijiang@redhat.com> <20181220054044.30738-2-lijiang@redhat.com> <4AE2DC15AC0B8543882A74EA0D43DBEC035656E1@BPXM09GP.gisp.nec.co.jp> From: lijiang Message-ID: Date: Fri, 4 Jan 2019 10:28:20 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <4AE2DC15AC0B8543882A74EA0D43DBEC035656E1@BPXM09GP.gisp.nec.co.jp> Content-Type: text/plain; charset=iso-2022-jp Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Fri, 04 Jan 2019 02:28:31 +0000 (UTC) Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org 在 2019年01月04日 03:28, Kazuhito Hagio 写道: > Hi Lianbo, > > -----Original Message----- >> +======================= >> +What is the VMCOREINFO? >> +======================= >> + >> +VMCOREINFO is a special ELF note section. It contains various >> +information from the kernel like structure size, page size, symbol >> +values, field offsets, etc. These data are packed into an ELF note >> +section and used by user-space tools like crash and makedumpfile to >> +analyze a kernel's memory layout. >> + >> +To dump the VMCOREINFO contents, one can do: >> + >> +# makedumpfile -g VMCOREINFO -x vmlinux > > again, this command does not dump the VMCOREINFO in ELF note section. > It converts the vmlinux's debug infomation into a VMCOREINFO-like data. > So I don't think this command is suitable to introduce here. > Thank you, Kazu. As you mentioned, makedumpfile in 'devel' branch can print VMCOREINFO in /proc/kcore, can i add the following command to this document? #makedumpfile --mem-usage /proc/kcore -D >> +PG_lru|PG_private|PG_swapcache|PG_swapbacked|PG_slab| >> +PG_hwpoision|PG_head_mask >> +----------------------------------------------------- >> + >> +Page attributes. These flags are used to filter free pages. > > Some of these are not used to filter *free* pages, so > > ... used to filter various unnecessary pages. > Great. I will modify it in next post. And also merge the 'PG_buddy' and 'PG_offline' into the PG_* flag here. Many thanks. Lianbo >> +PAGE_BUDDY_MAPCOUNT_VALUE or ~PG_buddy >> +-------------------------------------- > > then, this can be merged into the one above? > >> +====== >> +x86_64 >> +====== > ... >> +PAGE_OFFLINE_MAPCOUNT_VALUE(~PG_offline) >> +---------------------------------------- > > This looks not only for x86_64, and also can be merged into > the PG_* flags? > > Thank you for your effort! > Kazu > >