linux-kernel - Re: [PATCH 4.14 023/159] mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM

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Date:   Wed, 7 Feb 2018 20:00:30 +0800
From:   Dou Liyang <douly.fnst@...fujitsu.com>
To:     Mike Galbraith <efault@....de>,
        "Kirill A. Shutemov" <kirill@...temov.name>
CC:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Baoquan He <bhe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dave Young <dyoung@...hat.com>, <kexec@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>, <linux-mm@...ck.org>,
        Vivek Goyal <vgoyal@...hat.com>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...e.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Takao Indoh <indou.takao@...fujitsu.com>
Subject: Re: [PATCH 4.14 023/159] mm/sparsemem: Allocate mem_section at
 runtime for CONFIG_SPARSEMEM_EXTREME=y

Hi Kirill,Mike

At 02/07/2018 06:45 PM, Mike Galbraith wrote:
> On Wed, 2018-02-07 at 13:41 +0300, Kirill A. Shutemov wrote:
>> On Wed, Feb 07, 2018 at 05:25:05PM +0800, Dou Liyang wrote:
>>> Hi All,
>>>
>>> I met the makedumpfile failed in the upstream kernel which contained
>>> this patch. Did I missed something else?
>>
>> None I'm aware of.
>>
>> Is there a reason to suspect that the issue is related to the bug this patch
>> fixed?
> 

I did a contrastive test by my colleagues Indoh's suggestion.

Revert your two commits:

commit 83e3c48729d9ebb7af5a31a504f3fd6aff0348c4
Author: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Date:   Fri Sep 29 17:08:16 2017 +0300

commit 629a359bdb0e0652a8227b4ff3125431995fec6e
Author: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Date:   Tue Nov 7 11:33:37 2017 +0300

...and keep others unchanged, the makedumpfile works well.

> Still works fine for me with .today.  Box is only 16GB desktop box though.
> 
Btw, In the upstream kernel which contained this patch, I did two tests:

  1) use the makedumpfile as core_collector in /etc/kdump.conf, then
trigger the process of kdump by echo 1 >/proc/sysrq-trigger, the
makedumpfile works well and I can get the vmcore file.

      ......It is OK

  2) use cp as core_collector, do the same operation to get the vmcore 
file. then use makedumpfile to do like above:

     [douly@...alhost code]$ ./makedumpfile -d 31 --message-level 31 -x
vmlinux_4.15+ vmcore_4.15+_from_cp_command vmcore_4.15+

     ......It causes makedumpfile failed.


Thanks,
	dou.

> 	-Mike
> 
> 
>