linux-kernel - Re: [PATCH v4 0/6] Memory Hierarchy: Enable target node lookups for reserved memory

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Date:   Wed, 12 Feb 2020 18:28:12 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>
Cc:     David Hildenbrand <david@...hat.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        kbuild test robot <lkp@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michal Hocko <mhocko@...e.com>,
        Paul Mackerras <paulus@...ba.org>,
        Christoph Hellwig <hch@....de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Michael Ellerman <mpe@...erman.id.au>, X86 ML <x86@...nel.org>,
        "Oliver O'Halloran" <oohall@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>
Subject: Re: [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@...el.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(-)