Changes since v2 :
- Fix numa_cleanup_meminfo() to skip trimming reserved ranges to max_pfn.
- Collect Michael's acked-by
x86 folks: This has an ack from Rafael for ACPI, and Michael for Power.
With an x86 ack I plan to take this through the libnvdimm tree provided
the x86 touches look ok to you.
Arrange for platform numa info to be preserved for determining
'target_node' data. Where a 'target_node' is the node a reserved memory
range will become when it is onlined.
This new infrastructure is expected to be more valuable over time for
Memory Tiers / Hierarchy management as more platforms (via the ACPI HMAT
and EFI Specific Purpose Memory) publish reserved or "soft-reserved"
ranges to Linux. Linux system administrators will expect to be able to
interact with those ranges with a unique numa node number when/if that
memory is onlined via the dax_kmem driver .
One configuration that currently fails to properly convey the target
node for the resulting memory hotplug operation is persistent memory
defined by the memmap=nn!ss parameter. For example, today if node1 is a
memory only node, and all the memory from node1 is specified to
memmap=nn!ss and subsequently onlined, it will end up being onlined as
node0 memory. As it stands, memory_add_physaddr_to_nid() can only
identify online nodes and since node1 in this example has no online cpus
/ memory the target node is initialized node0.
The fix is to preserve rather than discard the numa_meminfo entries that
are relevant for reserved memory ranges, and to uplevel the node
distance helper for determining the "local" (closest) node relative to
an initiator node.
Dan Williams (6):
ACPI: NUMA: Up-level "map to online node" functionality
mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online_node()
powerpc/papr_scm: Switch to numa_map_to_online_node()
x86/mm: Introduce CONFIG_KEEP_NUMA
x86/numa: Provide a range-to-target_node lookup facility
libnvdimm/e820: Retrieve and populate correct 'target_node' info
arch/powerpc/platforms/pseries/papr_scm.c | 21 --------
arch/x86/Kconfig | 1
arch/x86/mm/numa.c | 74 +++++++++++++++++++++++------
drivers/acpi/numa/srat.c | 41 ----------------
drivers/nvdimm/e820.c | 18 ++-----
include/linux/acpi.h | 23 +++++++++
include/linux/numa.h | 23 +++++++++
mm/Kconfig | 5 ++
mm/mempolicy.c | 35 ++++++++++++++
9 files changed, 149 insertions(+), 92 deletions(-)