Here, we do two things:
1) patch1 ~ patch2: Prevent memblock from allocating memory in memory
to be set as ZONE_MOVABLE.
2) patch3: Provide movablemem_map=acpi option for users who
don't want to specify physical address in kernel
commandline. It will use SRAT info, and set all
the hotpluggable memory as ZONE_MOVABLE.
After applying these 3 patches, movablemem_map boot option will work like this:
/*
* For movablemem_map=acpi:
*
* SRAT: |_____| |_____| |_________| |_________| ......
* node id: 0 1 1 2
* hotpluggable: n y y n
* movablemem_map: |_____| |_________|
*
*
* For movablemem_map=nn[KMG]@ss[KMG]:
*
* SRAT: |_____| |_____| |_________| |_________| ......
* node id: 0 1 1 2
* user specified: |__| |___|
* movablemem_map: |___| |_________| |______| ......
*
* Using movablemem_map, we can prevent memblock from allocating memory
* on ZONE_MOVABLE at boot time.
*
* NOTE: In the second case, SRAT info will be ingored.
*/
NOTE: Using this boot option could cause NUMA performance down. For users who
don't want to lose NUMA performance, just do not use it now.
We will improve it all along.
For more info of movablemem_map, please refer to:
https://lkml.org/lkml/2013/1/14/87
Tang Chen (3):
acpi, memory-hotplug: Parse SRAT before memblock is ready.
acpi, memory-hotplug: Extend movablemem_map ranges to the end of
node.
acpi, memory-hotplug: Support getting hotplug info from SRAT.
Documentation/kernel-parameters.txt | 23 ++++++++--
arch/x86/kernel/setup.c | 13 ++++--
arch/x86/mm/numa.c | 2 +-
arch/x86/mm/srat.c | 81 +++++++++++++++++++++++++++++++++-
drivers/acpi/numa.c | 23 ++++++----
include/linux/acpi.h | 1 +
include/linux/mm.h | 6 +++
mm/page_alloc.c | 56 +++++++++++++++++++++++-
8 files changed, 179 insertions(+), 26 deletions(-)
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