Messages in this thread | | | From | Wen Congyang <> | Subject | [PART1 Patch 0/3] mm, memory-hotplug: allow to online movable memory | Date | Wed, 31 Oct 2012 13:40:33 +0800 |
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From: Lai Jiangshan <laijs@cn.fujitsu.com>
This patch is part1 of the following patchset: https://lkml.org/lkml/2012/10/29/319
The patchset is based on Linus's tree with these three patches already applied: https://lkml.org/lkml/2012/10/24/151 https://lkml.org/lkml/2012/10/26/150
Movable memory is a very important concept of memory-management, we need to consolidate it and make use of it on systems.
Movable memory is needed for anti-fragmentation(hugepage, big-order allocation...) logic hot-remove(virtualization, Memory capacity on Demand) physic hot-remove(power-saving, hardware partitioning, hardware fault management)
All these require dynamic configuring the memory and making better utilities of memories and safer. We also need physic hot-remove, so we need movable node too. (Although some systems support physic-memory-migration, we don't require all memory on physic-node is movable, but movable node is still needed here for logic-node if we want to make physic-migration is transparent)
We add dynamic configuration commands "online_movalbe" and "online_kernel" in this patchset, and you can't make a movable node(it will be implemented in part4).
Usage: 1. online_movable: echo online_movable >/sys/devices/system/memory/memoryX/state The memory must be offlined before doing this. 2. online_kernel: echo online_kernel >/sys/devices/system/memory/memoryX/state The memory must be offlined before doing this. 3. online: echo online_kernel >/sys/devices/system/memory/memoryX/state The memory must be offline before doing this. This operation does't change the memory's attribute: movable or normal/high
Note: You only can move the highest memory in normal/high zone to movable zone, and only can move the lowest memory in movable zone to normal/high zone.
Lai Jiangshan (3): mm, memory-hotplug: dynamic configure movable memory and portion memory memory_hotplug: handle empty zone when online_movable/online_kernel memory_hotplug: ensure every online node has NORMAL memory
Documentation/memory-hotplug.txt | 14 ++- drivers/base/memory.c | 27 +++--- include/linux/memory_hotplug.h | 13 ++- mm/memory_hotplug.c | 180 ++++++++++++++++++++++++++++++++++++++- 4 files changed, 221 insertions(+), 13 deletions(-)
-- 1.8.0
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