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SubjectRe: [PATCH v4 0/6] Memory Hierarchy: Enable target node lookups for reserved memory
On Tue, Jan 21, 2020 at 7:20 PM Dan Williams <dan.j.williams@intel.com> wrote:
>
> Changes since v3 [1]:
> - Cleanup numa_map_to_online_node() to remove redundant "if
> (!node_online(node))" (Aneesh)
>
> [1]: http://lore.kernel.org/r/157954696789.2239526.17707265517154476652.stgit@dwillia2-desk3.amr.corp.intel.com
>
> ---
>
> Merge notes:
>
> 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.

Ping x86 folks. There's no additional changes identified for this
series. Can I request an ack to take it through libnvdimm.git? Do you
need a resend?

x86/mm: Introduce CONFIG_KEEP_NUMA
x86/numa: Provide a range-to-target_node lookup facility


>
> ---
>
> Cover:
>
> 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 [2].
>
> 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.
>
> [2]: https://pmem.io/ndctl/daxctl-reconfigure-device.html
>
> ---
>
> 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 | 31 ++++++++++++
> 9 files changed, 145 insertions(+), 92 deletions(-)

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