From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: linux-s390@vger.kernel.org, linux-ia64@vger.kernel.org,
wency@cn.fujitsu.com, len.brown@intel.com,
linux-acpi@vger.kernel.org, linux-sh@vger.kernel.org,
x86@kernel.org, linux-kernel@vger.kernel.org,
cmetcalf@tilera.com, linux-mm@kvack.org, minchan.kim@gmail.com,
rientjes@google.com, sparclinux@vger.kernel.org, cl@linux.com,
linuxppc-dev@lists.ozlabs.org, akpm@linux-foundation.org,
liuj97@gmail.com
Subject: Re: [PATCH 0/10] memory-hotplug: hot-remove physical memory
Date: Fri, 5 Oct 2012 15:06:35 -0400 [thread overview]
Message-ID: <CAHGf_=qCZvL7xcOkea80Y995sZWkOMQLLVnuvLUto4W+qpUbWA@mail.gmail.com> (raw)
In-Reply-To: <506E43E0.70507@jp.fujitsu.com>
> Known problems:
> 1. memory can't be offlined when CONFIG_MEMCG is selected.
> For example: there is a memory device on node 1. The address range
> is [1G, 1.5G). You will find 4 new directories memory8, memory9, memory10,
> and memory11 under the directory /sys/devices/system/memory/.
> If CONFIG_MEMCG is selected, we will allocate memory to store page cgroup
> when we online pages. When we online memory8, the memory stored page cgroup
> is not provided by this memory device. But when we online memory9, the memory
> stored page cgroup may be provided by memory8. So we can't offline memory8
> now. We should offline the memory in the reversed order.
> When the memory device is hotremoved, we will auto offline memory provided
> by this memory device. But we don't know which memory is onlined first, so
> offlining memory may fail. In such case, you should offline the memory by
> hand before hotremoving the memory device.
Just iterate twice. 1st iterate: offline every non primary memory
block. 2nd iterate:
offline primary (i.e. first added) memory block. It may work.
next prev parent reply other threads:[~2012-10-05 19:07 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-05 2:20 [PATCH 0/10] memory-hotplug: hot-remove physical memory Yasuaki Ishimatsu
2012-10-05 2:25 ` [PATCH 1/10] memory-hotplug : check whether memory is offline or not when removing memory Yasuaki Ishimatsu
2012-10-05 19:27 ` KOSAKI Motohiro
2012-10-19 10:44 ` Wen Congyang
2012-10-19 14:15 ` Wen Congyang
2012-10-19 18:33 ` KOSAKI Motohiro
2012-10-20 0:50 ` Wen Congyang
2012-10-05 2:26 ` [PATCH 2/10] memory-hotplug : remove /sys/firmware/memmap/X sysfs Yasuaki Ishimatsu
2012-10-05 19:36 ` KOSAKI Motohiro
2012-10-11 7:06 ` Yasuaki Ishimatsu
2012-10-05 2:29 ` [PATCH 3/10] memory-hotplug : introduce new function arch_remove_memory() for removing page table depends on architecture Yasuaki Ishimatsu
2012-10-05 2:31 ` [PATCH 4/10] memory-hotplug : unregister memory section on SPARSEMEM_VMEMMAP Yasuaki Ishimatsu
2012-10-05 2:32 ` [PATCH 5/10] memory-hotplug : memory-hotplug: check page type in get_page_bootmem Yasuaki Ishimatsu
2012-10-12 19:28 ` KOSAKI Motohiro
2012-10-19 0:49 ` Yasuaki Ishimatsu
2012-10-19 1:55 ` Wen Congyang
2012-10-05 2:33 ` [PATCH 6/10] memory-hotplug : implement register_page_bootmem_info_section of sparse-vmemmap Yasuaki Ishimatsu
2012-10-05 2:34 ` [PATCH 7/10] memory-hotplug : remove memmap " Yasuaki Ishimatsu
2012-10-05 2:36 ` [PATCH 8/10] memory-hotplug : remove page table of x86_64 architecture Yasuaki Ishimatsu
2012-10-08 4:37 ` Andi Kleen
2012-10-08 5:23 ` Wen Congyang
2012-10-11 0:35 ` Ni zhan Chen
2012-10-09 8:26 ` wujianguo
2012-10-22 7:11 ` Wen Congyang
2012-10-23 7:09 ` wujianguo
2012-10-23 7:41 ` Wen Congyang
2012-10-05 2:37 ` [PATCH 9/10] memory-hotplug : memory_hotplug: clear zone when removing the memory Yasuaki Ishimatsu
2012-10-05 2:38 ` [PATCH 10/10] memory-hotplug : remove sysfs file of node Yasuaki Ishimatsu
2012-10-05 19:06 ` KOSAKI Motohiro [this message]
2012-10-08 5:26 ` [PATCH 0/10] memory-hotplug: hot-remove physical memory Wen Congyang
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