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Subject[PART1 Patch 0/3] mm, memory-hotplug: allow to online movable memory
From: Lai Jiangshan <>

This patch is part1 of the following patchset:

The patchset is based on Linus's tree with these three patches already applied:

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

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

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_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(-)


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