From: Christoph Lameter <cl@linux.com>
To: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-acpi@vger.kernel.org,
rientjes@google.com, liuj97@gmail.com, len.brown@intel.com,
benh@kernel.crashing.org, paulus@samba.org,
minchan.kim@gmail.com, akpm@linux-foundation.org,
kosaki.motohiro@jp.fujitsu.com, wency@cn.fujitsu.com
Subject: Re: [RFC PATCH v3 0/13] memory-hotplug : hot-remove physical memory
Date: Mon, 9 Jul 2012 10:18:54 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1207091015570.30060@router.home> (raw)
In-Reply-To: <4FFAB0A2.8070304@jp.fujitsu.com>
On Mon, 9 Jul 2012, Yasuaki Ishimatsu wrote:
> Even if you apply these patches, you cannot remove the physical memory
> completely since these patches are still under development. I want you to
> cooperate to improve the physical memory hot-remove. So please review these
> patches and give your comment/idea.
Could you at least give a method on how you want to do physical memory
removal? You would have to remove all objects from the range you want to
physically remove. That is only possible under special circumstances and
with a limited set of objects. Even if you exclusively use ZONE_MOVEABLE
you still may get cases where pages are pinned for a long time.
I am not sure that these patches are useful unless we know where you are
going with this. If we end up with a situation where we still cannot
remove physical memory then this patchset is not helpful.
--
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WARNING: multiple messages have this Message-ID (diff)
From: Christoph Lameter <cl@linux.com>
To: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-acpi@vger.kernel.org,
rientjes@google.com, liuj97@gmail.com, len.brown@intel.com,
benh@kernel.crashing.org, paulus@samba.org,
minchan.kim@gmail.com, akpm@linux-foundation.org,
kosaki.motohiro@jp.fujitsu.com, wency@cn.fujitsu.com
Subject: Re: [RFC PATCH v3 0/13] memory-hotplug : hot-remove physical memory
Date: Mon, 9 Jul 2012 10:18:54 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1207091015570.30060@router.home> (raw)
In-Reply-To: <4FFAB0A2.8070304@jp.fujitsu.com>
On Mon, 9 Jul 2012, Yasuaki Ishimatsu wrote:
> Even if you apply these patches, you cannot remove the physical memory
> completely since these patches are still under development. I want you to
> cooperate to improve the physical memory hot-remove. So please review these
> patches and give your comment/idea.
Could you at least give a method on how you want to do physical memory
removal? You would have to remove all objects from the range you want to
physically remove. That is only possible under special circumstances and
with a limited set of objects. Even if you exclusively use ZONE_MOVEABLE
you still may get cases where pages are pinned for a long time.
I am not sure that these patches are useful unless we know where you are
going with this. If we end up with a situation where we still cannot
remove physical memory then this patchset is not helpful.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Lameter <cl@linux.com>
To: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: len.brown@intel.com, wency@cn.fujitsu.com,
linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, paulus@samba.org, minchan.kim@gmail.com,
kosaki.motohiro@jp.fujitsu.com, rientjes@google.com,
akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org,
liuj97@gmail.com
Subject: Re: [RFC PATCH v3 0/13] memory-hotplug : hot-remove physical memory
Date: Mon, 9 Jul 2012 10:18:54 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1207091015570.30060@router.home> (raw)
In-Reply-To: <4FFAB0A2.8070304@jp.fujitsu.com>
On Mon, 9 Jul 2012, Yasuaki Ishimatsu wrote:
> Even if you apply these patches, you cannot remove the physical memory
> completely since these patches are still under development. I want you to
> cooperate to improve the physical memory hot-remove. So please review these
> patches and give your comment/idea.
Could you at least give a method on how you want to do physical memory
removal? You would have to remove all objects from the range you want to
physically remove. That is only possible under special circumstances and
with a limited set of objects. Even if you exclusively use ZONE_MOVEABLE
you still may get cases where pages are pinned for a long time.
I am not sure that these patches are useful unless we know where you are
going with this. If we end up with a situation where we still cannot
remove physical memory then this patchset is not helpful.
next prev parent reply other threads:[~2012-07-09 15:18 UTC|newest]
Thread overview: 172+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-09 10:21 [RFC PATCH v3 0/13] memory-hotplug : hot-remove physical memory Yasuaki Ishimatsu
2012-07-09 10:21 ` Yasuaki Ishimatsu
2012-07-09 10:21 ` Yasuaki Ishimatsu
2012-07-09 10:21 ` Yasuaki Ishimatsu
2012-07-09 10:23 ` [RFC PATCH v3 1/13] memory-hotplug : rename remove_memory to offline_memory Yasuaki Ishimatsu
2012-07-09 10:23 ` Yasuaki Ishimatsu
2012-07-09 10:23 ` Yasuaki Ishimatsu
2012-07-09 10:23 ` Yasuaki Ishimatsu
2012-07-09 10:24 ` [RFC PATCH v3 2/13] memory-hotplug : add physical memory hotplug code to acpi_memory_device_remove Yasuaki Ishimatsu
2012-07-09 10:24 ` Yasuaki Ishimatsu
2012-07-09 10:24 ` Yasuaki Ishimatsu
2012-07-13 3:26 ` Wen Congyang
2012-07-13 3:26 ` Wen Congyang
2012-07-13 3:26 ` Wen Congyang
2012-07-17 0:46 ` Yasuaki Ishimatsu
2012-07-17 0:46 ` Yasuaki Ishimatsu
2012-07-17 0:46 ` Yasuaki Ishimatsu
2012-07-17 0:46 ` Yasuaki Ishimatsu
2012-07-13 3:35 ` Wen Congyang
2012-07-13 3:35 ` Wen Congyang
2012-07-13 3:35 ` Wen Congyang
2012-07-17 1:44 ` Yasuaki Ishimatsu
2012-07-17 1:44 ` Yasuaki Ishimatsu
2012-07-17 1:44 ` Yasuaki Ishimatsu
2012-07-17 1:54 ` Yasuaki Ishimatsu
2012-07-17 1:54 ` Yasuaki Ishimatsu
2012-07-17 1:54 ` Yasuaki Ishimatsu
2012-07-17 2:32 ` Wen Congyang
2012-07-17 2:32 ` Wen Congyang
2012-07-17 2:32 ` Wen Congyang
2012-07-17 3:08 ` Yasuaki Ishimatsu
2012-07-17 3:08 ` Yasuaki Ishimatsu
2012-07-17 3:08 ` Yasuaki Ishimatsu
2012-07-17 3:08 ` Yasuaki Ishimatsu
2012-07-17 3:32 ` Wen Congyang
2012-07-17 3:32 ` Wen Congyang
2012-07-17 3:32 ` Wen Congyang
2012-07-17 4:51 ` Yasuaki Ishimatsu
2012-07-17 4:51 ` Yasuaki Ishimatsu
2012-07-17 4:51 ` Yasuaki Ishimatsu
2012-07-17 5:17 ` Wen Congyang
2012-07-17 5:17 ` Wen Congyang
2012-07-17 5:17 ` Wen Congyang
2012-07-17 5:19 ` Yasuaki Ishimatsu
2012-07-17 5:19 ` Yasuaki Ishimatsu
2012-07-17 5:19 ` Yasuaki Ishimatsu
2012-07-17 5:19 ` Yasuaki Ishimatsu
2012-07-13 10:40 ` Wen Congyang
2012-07-13 10:40 ` Wen Congyang
2012-07-13 10:40 ` Wen Congyang
2012-07-17 1:10 ` Yasuaki Ishimatsu
2012-07-17 1:10 ` Yasuaki Ishimatsu
2012-07-17 1:10 ` Yasuaki Ishimatsu
2012-07-17 1:10 ` Yasuaki Ishimatsu
2012-07-09 10:25 ` [RFC PATCH v3 3/13] memory-hotplug : unify argument of firmware_map_add_early/hotplug Yasuaki Ishimatsu
2012-07-09 10:25 ` Yasuaki Ishimatsu
2012-07-09 10:25 ` Yasuaki Ishimatsu
2012-07-09 10:25 ` Yasuaki Ishimatsu
2012-07-11 15:30 ` Dave Hansen
2012-07-11 15:30 ` Dave Hansen
2012-07-11 15:30 ` Dave Hansen
2012-07-12 4:52 ` Yasuaki Ishimatsu
2012-07-12 4:52 ` Yasuaki Ishimatsu
2012-07-12 4:52 ` Yasuaki Ishimatsu
2012-07-12 4:52 ` Yasuaki Ishimatsu
2012-07-12 13:40 ` Dave Hansen
2012-07-12 13:40 ` Dave Hansen
2012-07-12 13:40 ` Dave Hansen
2012-07-13 4:34 ` Yasuaki Ishimatsu
2012-07-13 4:34 ` Yasuaki Ishimatsu
2012-07-13 4:34 ` Yasuaki Ishimatsu
2012-07-13 5:11 ` Yasuaki Ishimatsu
2012-07-13 5:11 ` Yasuaki Ishimatsu
2012-07-13 5:11 ` Yasuaki Ishimatsu
2012-07-09 10:26 ` [RFC PATCH v3 4/13] memory-hotplug : remove /sys/firmware/memmap/X sysfs Yasuaki Ishimatsu
2012-07-09 10:26 ` Yasuaki Ishimatsu
2012-07-09 10:26 ` Yasuaki Ishimatsu
2012-07-09 10:26 ` Yasuaki Ishimatsu
2012-07-13 9:10 ` Wen Congyang
2012-07-13 9:10 ` Wen Congyang
2012-07-13 9:10 ` Wen Congyang
2012-07-17 0:28 ` Yasuaki Ishimatsu
2012-07-17 0:28 ` Yasuaki Ishimatsu
2012-07-17 0:28 ` Yasuaki Ishimatsu
2012-07-16 2:32 ` Wen Congyang
2012-07-16 2:32 ` Wen Congyang
2012-07-16 2:32 ` Wen Congyang
2012-07-17 0:30 ` Yasuaki Ishimatsu
2012-07-17 0:30 ` Yasuaki Ishimatsu
2012-07-17 0:30 ` Yasuaki Ishimatsu
2012-07-17 0:30 ` Yasuaki Ishimatsu
2012-07-09 10:26 ` [RFC PATCH v3 5/13] memory-hotplug : does not release memory region in PAGES_PER_SECTION chunks Yasuaki Ishimatsu
2012-07-09 10:26 ` Yasuaki Ishimatsu
2012-07-09 10:26 ` Yasuaki Ishimatsu
2012-07-09 10:26 ` Yasuaki Ishimatsu
2012-07-13 3:42 ` Wen Congyang
2012-07-13 3:42 ` Wen Congyang
2012-07-13 3:42 ` Wen Congyang
2012-07-09 10:27 ` [RFC PATCH v3 6/13] memory-hotplug : add memory_block_release Yasuaki Ishimatsu
2012-07-09 10:27 ` Yasuaki Ishimatsu
2012-07-09 10:27 ` Yasuaki Ishimatsu
2012-07-09 10:27 ` Yasuaki Ishimatsu
2012-07-09 10:28 ` [RFC PATCH v3 7/13] memory-hotplug : remove_memory calls __remove_pages Yasuaki Ishimatsu
2012-07-09 10:28 ` Yasuaki Ishimatsu
2012-07-09 10:28 ` Yasuaki Ishimatsu
2012-07-09 10:28 ` Yasuaki Ishimatsu
2012-07-09 10:29 ` [RFC PATCH v3 8/13] memory-hotplug : check page type in get_page_bootmem Yasuaki Ishimatsu
2012-07-09 10:29 ` Yasuaki Ishimatsu
2012-07-09 10:29 ` Yasuaki Ishimatsu
2012-07-09 10:30 ` [RFC PATCH v3 9/13] memory-hotplug : move register_page_bootmem_info_node and put_page_bootmem for sparse-vmemmap Yasuaki Ishimatsu
2012-07-09 10:30 ` Yasuaki Ishimatsu
2012-07-09 10:30 ` Yasuaki Ishimatsu
2012-07-09 10:32 ` [RFC PATCH v3 10/13] memory-hotplug : implement register_page_bootmem_info_section of sparse-vmemmap Yasuaki Ishimatsu
2012-07-09 10:32 ` Yasuaki Ishimatsu
2012-07-09 10:32 ` Yasuaki Ishimatsu
2012-07-09 10:32 ` Yasuaki Ishimatsu
2012-07-09 10:33 ` [RFC PATCH v3 11/13] memory-hotplug : free memmap " Yasuaki Ishimatsu
2012-07-09 10:33 ` Yasuaki Ishimatsu
2012-07-09 10:33 ` Yasuaki Ishimatsu
2012-07-09 10:33 ` Yasuaki Ishimatsu
2012-07-11 5:06 ` Wen Congyang
2012-07-11 5:06 ` Wen Congyang
2012-07-11 5:06 ` Wen Congyang
2012-07-11 5:52 ` Yasuaki Ishimatsu
2012-07-11 5:52 ` Yasuaki Ishimatsu
2012-07-11 5:52 ` Yasuaki Ishimatsu
2012-07-11 6:25 ` Wen Congyang
2012-07-11 6:25 ` Wen Congyang
2012-07-11 6:25 ` Wen Congyang
2012-07-11 6:48 ` Yasuaki Ishimatsu
2012-07-11 6:48 ` Yasuaki Ishimatsu
2012-07-11 6:48 ` Yasuaki Ishimatsu
2012-07-11 7:27 ` Wen Congyang
2012-07-11 7:27 ` Wen Congyang
2012-07-11 7:27 ` Wen Congyang
2012-07-09 10:34 ` [RFC PATCH v3 12/13] memory-hotplug : add node_device_release Yasuaki Ishimatsu
2012-07-09 10:34 ` Yasuaki Ishimatsu
2012-07-09 10:34 ` Yasuaki Ishimatsu
2012-07-09 10:34 ` Yasuaki Ishimatsu
2012-07-09 10:35 ` [RFC PATCH v3 13/13] memory-hotplug : remove sysfs file of node Yasuaki Ishimatsu
2012-07-09 10:35 ` Yasuaki Ishimatsu
2012-07-09 10:35 ` Yasuaki Ishimatsu
2012-07-09 10:35 ` Yasuaki Ishimatsu
2012-07-09 15:18 ` Christoph Lameter [this message]
2012-07-09 15:18 ` [RFC PATCH v3 0/13] memory-hotplug : hot-remove physical memory Christoph Lameter
2012-07-09 15:18 ` Christoph Lameter
2012-07-10 9:58 ` Yasuaki Ishimatsu
2012-07-10 9:58 ` Yasuaki Ishimatsu
2012-07-10 9:58 ` Yasuaki Ishimatsu
2012-07-10 9:58 ` Yasuaki Ishimatsu
2012-07-10 16:50 ` Jiang Liu
2012-07-10 16:50 ` Jiang Liu
2012-07-10 16:50 ` Jiang Liu
2012-07-11 0:09 ` Yasuaki Ishimatsu
2012-07-11 0:09 ` Yasuaki Ishimatsu
2012-07-11 0:09 ` Yasuaki Ishimatsu
2012-07-11 0:09 ` Yasuaki Ishimatsu
2012-07-11 0:21 ` Jiang Liu
2012-07-11 0:21 ` Jiang Liu
2012-07-11 0:21 ` Jiang Liu
2012-07-11 0:54 ` Yasuaki Ishimatsu
2012-07-11 0:54 ` Yasuaki Ishimatsu
2012-07-11 0:54 ` Yasuaki Ishimatsu
2012-07-11 14:24 ` Jiang Liu
2012-07-11 14:24 ` Jiang Liu
2012-07-11 14:24 ` Jiang Liu
2012-07-11 1:52 ` Wen Congyang
2012-07-11 1:52 ` Wen Congyang
2012-07-11 1:52 ` Wen Congyang
2012-07-11 2:24 ` Wen Congyang
2012-07-11 2:24 ` Wen Congyang
2012-07-11 2:24 ` Wen Congyang
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