[Patch v4 00/12] memory-hotplug: hot-remove physical memory
tangchen at cn.fujitsu.com
Fri Nov 30 17:37:41 EST 2012
On 11/28/2012 03:27 AM, Andrew Morton wrote:
>> - acpi framework
> What's happening with the acpi framework? has it received any feedback
> from the ACPI developers?
About ACPI framework, we are trying to do the following.
The memory device can be removed by 2 ways:
1. send eject request by SCI
2. echo 1 >/sys/bus/pci/devices/PNP0C80:XX/eject
In the 1st case, acpi_memory_disable_device() will be called.
In the 2nd case, acpi_memory_device_remove() will be called.
acpi_memory_device_remove() will also be called when we unbind the
memory device from the driver acpi_memhotplug or a driver
acpi_memory_disable_device() has already implemented a code which
offlines memory and releases acpi_memory_info struct . But
acpi_memory_device_remove() has not implemented it yet.
So the patch prepares the framework for hot removing memory and
adds the framework into acpi_memory_device_remove().
All the ACPI related patches have been put into the linux-next branch
of the linux-pm.git tree as v3.8 material.Please refer to the following
So for now, with this patch set, we can do memory hot-remove on x86_64
I do hope you would merge them before 3.8-rc1, so that we can use this
functionality in 3.8.
As we are still testing all memory hotplug related functionalities, I
hope we can do the bug fix during 3.8 rc.
More information about the Linuxppc-dev