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From: Guenter Roeck <linux@roeck-us.net>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-fsdevel@vger.kernel.org, linux-next@vger.kernel.org,
	sfr@canb.auug.org.au, mhocko@suse.cz,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: mmotm 2015-01-22-15-04: qemu failures due to 'mm: account pmd page tables to the process'
Date: Mon, 26 Jan 2015 06:03:57 -0800	[thread overview]
Message-ID: <54C6494D.80802@roeck-us.net> (raw)
In-Reply-To: <20150126122944.GE25833@node.dhcp.inet.fi>

On 01/26/2015 04:29 AM, Kirill A. Shutemov wrote:
> On Fri, Jan 23, 2015 at 09:52:07PM -0800, Guenter Roeck wrote:
>> On Fri, Jan 23, 2015 at 01:55:19PM -0800, Andrew Morton wrote:
>>> On Fri, 23 Jan 2015 07:07:56 -0800 Guenter Roeck <linux@roeck-us.net> wrote:
>>>
>>>>>>
>>>>>> qemu:microblaze generates warnings to the console.
>>>>>>
>>>>>> WARNING: CPU: 0 PID: 32 at mm/mmap.c:2858 exit_mmap+0x184/0x1a4()
>>>>>>
>>>>>> with various call stacks. See
>>>>>> http://server.roeck-us.net:8010/builders/qemu-microblaze-mmotm/builds/15/steps/qemubuildcommand/logs/stdio
>>>>>> for details.
>>>>>
>>>>> Could you try patch below? Completely untested.
>>>>>
>>>>> >From b584bb8d493794f67484c0b57c161d61c02599bc Mon Sep 17 00:00:00 2001
>>>>> From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
>>>>> Date: Fri, 23 Jan 2015 13:08:26 +0200
>>>>> Subject: [PATCH] microblaze: define __PAGETABLE_PMD_FOLDED
>>>>>
>>>>> Microblaze uses custom implementation of PMD folding, but doesn't define
>>>>> __PAGETABLE_PMD_FOLDED, which generic code expects to see. Let's fix it.
>>>>>
>>>>> Defining __PAGETABLE_PMD_FOLDED will drop out unused __pmd_alloc().
>>>>> It also fixes problems with recently-introduced pmd accounting.
>>>>>
>>>>> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
>>>>> Reported-by: Guenter Roeck <linux@roeck-us.net>
>>>>
>>>> Tested working.
>>>>
>>>> Tested-by: Guenter Roeck <linux@roeck-us.net>
>>>>
>>>> Any idea how to fix the sh problem ?
>>>
>>> Can you tell us more about it?  All I'm seeing is "qemu:sh fails to
>>> shut down", which isn't very clear.
>>
>> Turns out that the include file defining __PAGETABLE_PMD_FOLDED
>> was not always included where used, resulting in a messed up mm_struct.
>
> What means "messed up" here? It should only affect size of mm_struct.
>
Plus the offset of all variables after the #ifndef.

>> The patch below fixes the problem for the sh architecture.
>> No idea if the patch is correct/acceptable for other architectures.
>
> That's pain. Some archs includes <linux/mm_types.h> from <asm/pgtable.h>.
> I don't see obvious way to fix this. Urghh.
>
Does it matter ? Circular includes are normally ok and happen all over the place.
I could run a full build / qemu test cycle for all architectures if that helps.

Guenter


  reply	other threads:[~2015-01-26 14:04 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-22 23:05 mmotm 2015-01-22-15-04 uploaded akpm
2015-01-23  5:04 ` mmotm 2015-01-22-15-04: qemu failures due to 'mm: account pmd page tables to the process' Guenter Roeck
2015-01-23 11:13   ` Kirill A. Shutemov
2015-01-23 15:07     ` Guenter Roeck
2015-01-23 21:55       ` Andrew Morton
2015-01-24  2:44         ` Guenter Roeck
2015-01-24  3:05           ` Guenter Roeck
2015-01-24  5:52         ` Guenter Roeck
2015-01-26 12:29           ` Kirill A. Shutemov
2015-01-26 14:03             ` Guenter Roeck [this message]
2015-01-26 14:17               ` Guenter Roeck
2015-01-27 16:16               ` Kirill A. Shutemov
2015-01-27 16:24                 ` Guenter Roeck
2015-01-27 21:24                   ` Andrew Morton
2015-01-28  6:16                     ` Guenter Roeck
2015-01-23  5:08 ` mmotm 2015-01-22-15-04: qemu failure due to 'mm: memcontrol: remove unnecessary soft limit tree node test' Guenter Roeck
2015-01-23 14:18   ` Johannes Weiner
2015-01-23 15:17     ` Christoph Lameter
2015-01-23 16:02       ` Johannes Weiner
2015-01-23 16:59         ` Guenter Roeck
2015-01-23 17:36           ` Johannes Weiner
2015-01-23 17:38             ` Johannes Weiner
2015-01-24  2:02             ` Guenter Roeck
2015-01-27 17:24       ` Michal Hocko
2015-01-28 15:03         ` Christoph Lameter
2015-01-23 15:46     ` Guenter Roeck
2015-01-23 16:03       ` Johannes Weiner
2015-01-23 20:20     ` Christoph Lameter
2015-01-23 20:33       ` Guenter Roeck
2015-01-23 21:09         ` Christoph Lameter
2015-01-24  7:16           ` Johannes Weiner
2015-01-25 21:36             ` Valdis.Kletnieks
2015-01-26 13:37               ` Johannes Weiner

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