linux-kernel - Re: [PATCH v5 5/6] x86/NUMA: Provide a range-to-target

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Date:   Mon, 17 Feb 2020 09:22:56 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Dan Williams <dan.j.williams@...el.com>, linux-nvdimm@...ts.01.org
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        kbuild test robot <lkp@...el.com>,
        Ingo Molnar <mingo@...nel.org>, vishal.l.verma@...el.com,
        hch@....de, linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v5 5/6] x86/NUMA: Provide a range-to-target_node lookup facility

Dan Williams <dan.j.williams@...el.com> writes:

> The DEV_DAX_KMEM facility is a generic mechanism to allow device-dax
> instances, fronting performance-differentiated-memory like pmem, to be
> added to the System RAM pool. The NUMA node for that hot-added memory is
> derived from the device-dax instance's 'target_node' attribute.
>
> Recall that the 'target_node' is the ACPI-PXM-to-node translation for
> memory when it comes online whereas the 'numa_node' attribute of the
> device represents the closest online cpu node.
>
> Presently useful target_node information from the ACPI SRAT is discarded
> with the expectation that "Reserved" memory will never be onlined. Now,
> DEV_DAX_KMEM violates that assumption, there is a need to retain the
> translation. Move, rather than discard, numa_memblk data to a secondary
> array that memory_add_physaddr_to_target_node() may consider at a later
> point in time.
>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: <x86@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Michal Hocko <mhocko@...e.com>
> Reported-by: kbuild test robot <lkp@...el.com>
> Reviewed-by: Ingo Molnar <mingo@...nel.org>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>