Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754991Ab3FGBOF (ORCPT ); Thu, 6 Jun 2013 21:14:05 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:19037 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1754553Ab3FGBNy (ORCPT ); Thu, 6 Jun 2013 21:13:54 -0400 X-IronPort-AV: E=Sophos;i="4.87,818,1363104000"; d="scan'208";a="7485802" Message-ID: <51B1332E.4030907@cn.fujitsu.com> Date: Fri, 07 Jun 2013 09:11:10 +0800 From: Zhang Yanfei User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.8) Gecko/20121012 Thunderbird/10.0.8 MIME-Version: 1.0 To: Maxim Uvarov CC: Atsushi Kumagai , riel@redhat.com, "kexec@lists.infradead.org" , hughd@google.com, linux-kernel@vger.kernel.org, lisa.mitchell@hp.com, Vivek Goyal , linux-mm@kvack.org, HATAYAMA Daisuke , "Eric W. Biederman" , kosaki.motohiro@jp.fujitsu.com, Andrew Morton , walken@google.com, Cliff Wickman , jingbai.ma@hp.com Subject: Re: [PATCH v8 9/9] vmcore: support mmap() on /proc/vmcore References: <20130523052421.13864.83978.stgit@localhost6.localdomain6> <20130523052547.13864.83306.stgit@localhost6.localdomain6> <20130523152445.17549682ae45b5aab3f3cde0@linux-foundation.org> <51A2BBA7.50607@jp.fujitsu.com> <51A71B49.3070003@cn.fujitsu.com> <20130603174351.d04b2ac71d1bab0df242e0ba@mxc.nes.nec.co.jp> In-Reply-To: X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/06/07 09:12:06, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/06/07 09:12:07, Serialize complete at 2013/06/07 09:12:07 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4732 Lines: 113 On 06/04/2013 11:34 PM, Maxim Uvarov wrote: > > > > 2013/6/3 Atsushi Kumagai > > > Hello Maxim, > > On Thu, 30 May 2013 14:30:01 +0400 > Maxim Uvarov > wrote: > > > 2013/5/30 Zhang Yanfei > > > > > > On 05/30/2013 05:14 PM, Maxim Uvarov wrote: > > > > > > > > > > > > > > > > 2013/5/27 HATAYAMA Daisuke > > d.hatayama@jp.fujitsu.com >> > > > > > > > > (2013/05/24 18:02), Maxim Uvarov wrote: > > > > > > > > > > > > > > > > > > > > 2013/5/24 Andrew Morton > > akpm@linux-foundation.org > __org > > akpm@linux-foundation.org >>> > > > > > > > > > > > > On Thu, 23 May 2013 14:25:48 +0900 HATAYAMA Daisuke < > > > d.hatayama@jp.fujitsu.com > > > d.hatayama@jp.fujitsu.__com >>> wrote: > > > > > > > > > This patch introduces mmap_vmcore(). > > > > > > > > > > Don't permit writable nor executable mapping even with > > > mprotect() > > > > > because this mmap() is aimed at reading crash dump memory. > > > > > Non-writable mapping is also requirement of > > > remap_pfn_range() when > > > > > mapping linear pages on non-consecutive physical pages; > > > see > > > > > is_cow_mapping(). > > > > > > > > > > Set VM_MIXEDMAP flag to remap memory by remap_pfn_range > > > and by > > > > > remap_vmalloc_range_pertial at the same time for a single > > > > > vma. do_munmap() can correctly clean partially remapped > > > vma with two > > > > > functions in abnormal case. See zap_pte_range(), > > > vm_normal_page() and > > > > > their comments for details. > > > > > > > > > > On x86-32 PAE kernels, mmap() supports at most 16TB > > > memory only. This > > > > > limitation comes from the fact that the third argument of > > > > > remap_pfn_range(), pfn, is of 32-bit length on x86-32: > > > unsigned long. > > > > > > > > More reviewing and testing, please. > > > > > > > > > > > > Do you have git pull for both kernel and userland changes? I > > > would like to do some more testing on my machines. > > > > > > > > Maxim. > > > > > > > > > > > > Thanks! That's very helpful. > > > > > > > > -- > > > > Thanks. > > > > HATAYAMA, Daisuke > > > > > > > > Any update for this? Where can I checkout all sources? > > > > > > This series is now in Andrew Morton's -mm tree. > > > > > > Ok, and what about makedumpfile changes? Is it possible to fetch them from > > somewhere? > > You can fetch them from here, "mmap" branch is the change: > > git://git.code.sf.net/p/makedumpfile/code > > And they will be merged into v1.5.4. > > > thank you, got it. But still do not see kernel patches in akpm tree: > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git > http://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git > > > Should I look at different branch? Now it is merged into the next tree you list above. See the commit: author HATAYAMA Daisuke 2013-06-06 00:40:01 (GMT) committer Stephen Rothwell 2013-06-06 05:50:03 (GMT) commit 4be2c06c30e4c3994d86e0be24ff1af12d2c71d5 (patch) tree d7fb8c64c628600e8ba24481927f087fc11c2986 parent 99f80952861807e521ed30c22925f009f543a5ec (diff) -- Thanks. Zhang Yanfei -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/