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From: Wen Congyang <wency@cn.fujitsu.com>
To: Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, linux-acpi@vger.kernel.org,
	linux-s390@vger.kernel.org, linux-sh@vger.kernel.org,
	linux-ia64@vger.kernel.org, cmetcalf@tilera.com,
	sparclinux@vger.kernel.org, rientjes@google.com,
	liuj97@gmail.com, len.brown@intel.com, benh@kernel.crashing.org,
	paulus@samba.org, cl@linux.com, minchan.kim@gmail.com,
	kosaki.motohiro@jp.fujitsu.com
Subject: Re: [RFC v8 PATCH 00/20] memory-hotplug: hot-remove physical memory
Date: Tue, 18 Sep 2012 17:39:37 +0800	[thread overview]
Message-ID: <50584159.3020403@cn.fujitsu.com> (raw)
In-Reply-To: <20120912171814.GB5253@dhcp-192-168-178-175.profitbricks.localdomain>

At 09/13/2012 01:18 AM, Vasilis Liaskovitis Wrote:
> Hi,
> 
> On Wed, Sep 12, 2012 at 01:20:28PM +0800, Wen Congyang wrote:
>>>
>>> On Mon, Sep 10, 2012 at 10:01:44AM +0800, Wen Congyang wrote:
>>>> At 09/10/2012 09:46 AM, Yasuaki Ishimatsu Wrote:
>>>>> How do you test the patch? As Andrew says, for hot-removing memory,
>>>>> we need a particular hardware. I think so too. So many people may want
>>>>> to know how to test the patch.
>>>>> If we apply following patch to kvm guest, can we hot-remove memory on
>>>>> kvm guest?
>>>>>
>>>>> http://lists.gnu.org/archive/html/qemu-devel/2012-07/msg01389.html
>>>>
>>>> Yes, if we apply this patchset, we can test hot-remove memory on kvm guest.
>>>> But that patchset doesn't implement _PS3, so there is some restriction.
>>>
>>> the following repos contain the patchset above, plus 2 more patches that add
>>> PS3 support to the dimm devices in qemu/seabios:
>>>
>>> https://github.com/vliaskov/seabios/commits/memhp-v2
>>> https://github.com/vliaskov/qemu-kvm/commits/memhp-v2
>>>
>>> I have not posted the PS3 patches yet in the qemu list, but will post them
>>> soon for v3 of the memory hotplug series. If you have issues testing, let me
>>> know.
>>
>> Hmm, seabios doesn't support ACPI table SLIT. We can specify node it for dimm
>> device, so I think we should support SLIT in seabios. Otherwise we may meet
>> the following kernel messages:
>> [  325.016769] init_memory_mapping: [mem 0x40000000-0x5fffffff]
>> [  325.018060]  [mem 0x40000000-0x5fffffff] page 2M
>> [  325.019168] [ffffea0001000000-ffffea00011fffff] potential offnode page_structs
>> [  325.024172] [ffffea0001200000-ffffea00013fffff] potential offnode page_structs
>> [  325.028596]  [ffffea0001400000-ffffea00017fffff] PMD -> [ffff880035000000-ffff8800353fffff] on node 1
>> [  325.031775] [ffffea0001600000-ffffea00017fffff] potential offnode page_structs
>>
>> Do you have plan to do it?
> thanks for testing.
> 
> commit 5294828 from https://github.com/vliaskov/seabios/commits/memhp-v2
> implements a SLIT table for the given numa nodes.

Hmm, why do you set node_distance(i, j) to REMOTE_DISTANCE if i != j?

> 
> However I am not sure the SLIT is the problem. The kernel builds a default
> numa_distance table in arch/x86/mm/numa.c: numa_alloc_distance(). If the BIOS
> doesn't present a SLIT, this should take effect (numactl --hardware should
> report this table)

If the BIOS doesn't present a SLIT, numa_distance_cnt is set to 0 in the
function numa_reset_distance(). So node_distance(i, j) is REMOTE_DISTANCE(i != j).

> 
> Do you have more details on how to reproduce the warning? e.g. how many dimms
> are present in the system? Does this happen on the first dimm hot-plugged?
> Are all SRAT entries parsed correctly at boot-time or do you see any other
> warnings at boot-time?

I can't reproduce it again. IIRC, I only do the following things:
hotplug a memory device, online the pages, offline the pages and hot remove
the memory device.

Thanks
Wen Congyang

> 
> I 'll investigate a bit more and report back.
> 
> thanks,
> 
> - Vasilis
> 


  reply	other threads:[~2012-09-18  9:34 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-28 10:00 [RFC v8 PATCH 00/20] memory-hotplug: hot-remove physical memory wency
2012-08-28 10:00 ` [RFC v8 PATCH 01/20] memory-hotplug: rename remove_memory() to offline_memory()/offline_pages() wency
2012-08-28 10:00 ` [RFC v8 PATCH 02/20] memory-hotplug: implement offline_memory() wency
2012-08-28 10:00 ` [RFC v8 PATCH 03/20] memory-hotplug: store the node id in acpi_memory_device wency
2012-08-28 10:00 ` [RFC v8 PATCH 04/20] memory-hotplug: offline and remove memory when removing the memory device wency
2012-08-31 20:55   ` Andrew Morton
2012-09-03  1:30     ` Wen Congyang
2012-08-28 10:00 ` [RFC v8 PATCH 05/20] memory-hotplug: check whether memory is present or not wency
2012-08-28 10:00 ` [RFC v8 PATCH 06/20] memory-hotplug: export the function acpi_bus_remove() wency
2012-08-28 10:00 ` [RFC v8 PATCH 07/20] memory-hotplug: call acpi_bus_remove() to remove memory device wency
2012-08-28 10:00 ` [RFC v8 PATCH 08/20] memory-hotplug: remove /sys/firmware/memmap/X sysfs wency
2012-08-31 21:06   ` Andrew Morton
2012-09-03  5:51     ` Wen Congyang
2012-09-04 23:16       ` Andrew Morton
2012-09-05  1:41         ` Wen Congyang
2012-09-03  7:31     ` Wen Congyang
2012-08-28 10:00 ` [RFC v8 PATCH 09/20] memory-hotplug: does not release memory region in PAGES_PER_SECTION chunks wency
2012-08-28 10:00 ` [RFC v8 PATCH 10/20] memory-hotplug: add memory_block_release wency
2012-08-28 10:00 ` [RFC v8 PATCH 11/20] memory-hotplug: remove_memory calls __remove_pages wency
2012-08-28 10:00 ` [RFC v8 PATCH 12/20] memory-hotplug: introduce new function arch_remove_memory() wency
2012-08-28 10:00 ` [RFC v8 PATCH 13/20] memory-hotplug: check page type in get_page_bootmem wency
2012-08-31 21:30   ` Andrew Morton
2012-09-04  3:46     ` Wen Congyang
2012-09-04  9:54       ` Yasuaki Ishimatsu
2012-08-28 10:00 ` [RFC v8 PATCH 14/20] memory-hotplug: move register_page_bootmem_info_node and put_page_bootmem for sparse-vmemmap wency
2012-08-28 10:00 ` [RFC v8 PATCH 15/20] memory-hotplug: implement register_page_bootmem_info_section of sparse-vmemmap wency
2012-08-28 10:00 ` [RFC v8 PATCH 16/20] memory-hotplug: free memmap " wency
2012-08-28 10:00 ` [RFC v8 PATCH 17/20] memory_hotplug: clear zone when the memory is removed wency
2012-08-28 10:00 ` [RFC v8 PATCH 18/20] memory-hotplug: add node_device_release wency
2012-08-28 10:00 ` [RFC v8 PATCH 19/20] memory-hotplug: remove sysfs file of node wency
2012-08-28 10:00 ` [RFC v8 PATCH 20/20] memory-hotplug: clear hwpoisoned flag when onlining pages wency
2012-08-31 20:49 ` [RFC v8 PATCH 00/20] memory-hotplug: hot-remove physical memory Andrew Morton
2012-09-10  1:46   ` Yasuaki Ishimatsu
2012-09-10  2:01     ` Wen Congyang
2012-09-10 13:52       ` Vasilis Liaskovitis
     [not found]         ` <CAAV+Mu7YWRWnxt78F4ZDMrrUsWB=n-_qkYOcQT7WQ2HwP89Obw@mail.gmail.com>
2012-09-11  1:23           ` Minchan Kim
     [not found]             ` <CAAV+Mu4hb0qbW2Ry6w5FAGUM06puDH0v_H-jr584-G9CzJqSGw@mail.gmail.com>
2012-09-11  5:39               ` Wen Congyang
2012-09-12  6:17               ` Minchan Kim
2012-09-11  1:25           ` Wen Congyang
2012-09-12  5:20         ` Wen Congyang
2012-09-12 17:18           ` Vasilis Liaskovitis
2012-09-18  9:39             ` Wen Congyang [this message]
2012-09-19 17:02               ` Vasilis Liaskovitis

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