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From: Thomas Gleixner <tglx@linutronix.de>
To: Dan Williams <dan.j.williams@intel.com>, linux-nvdimm@lists.01.org
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>,
	x86@kernel.org, Andrew Morton <akpm@linux-foundation.org>,
	David Hildenbrand <david@redhat.com>,
	Michal Hocko <mhocko@suse.com>, kbuild test robot <lkp@intel.com>,
	Ingo Molnar <mingo@kernel.org>,
	hch@lst.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 5/6] x86/NUMA: Provide a range-to-target_node lookup facility
Date: Mon, 17 Feb 2020 09:22:56 +0100
Message-ID: <87y2t1pqqn.fsf@nanos.tec.linutronix.de> (raw)
In-Reply-To: <158188326978.894464.217282995221175417.stgit@dwillia2-desk3.amr.corp.intel.com>

Dan Williams <dan.j.williams@intel.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@linux.intel.com>
> Cc: Andy Lutomirski <luto@kernel.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: "H. Peter Anvin" <hpa@zytor.com>
> Cc: <x86@kernel.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: David Hildenbrand <david@redhat.com>
> Cc: Michal Hocko <mhocko@suse.com>
> Reported-by: kbuild test robot <lkp@intel.com>
> Reviewed-by: Ingo Molnar <mingo@kernel.org>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-22  3:04 [PATCH v4 0/6] Memory Hierarchy: Enable target node lookups for reserved memory Dan Williams
2020-01-22  3:04 ` [PATCH v4 1/6] ACPI: NUMA: Up-level "map to online node" functionality Dan Williams
2020-01-22  3:04 ` [PATCH v4 2/6] mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online_node() Dan Williams
2020-01-22  3:04 ` [PATCH v4 3/6] powerpc/papr_scm: Switch to numa_map_to_online_node() Dan Williams
2020-01-22  3:04 ` [PATCH v4 4/6] x86/mm: Introduce CONFIG_KEEP_NUMA Dan Williams
2020-02-13  9:32   ` Ingo Molnar
2020-02-13 21:19     ` Dan Williams
2020-02-13 11:22   ` Thomas Gleixner
2020-02-13 21:21     ` Dan Williams
2020-01-22  3:05 ` [PATCH v4 5/6] x86/numa: Provide a range-to-target_node lookup facility Dan Williams
2020-02-13  9:36   ` Ingo Molnar
2020-02-13 11:37   ` Thomas Gleixner
2020-02-13 21:40     ` Dan Williams
2020-01-22  3:05 ` [PATCH v4 6/6] libnvdimm/e820: Retrieve and populate correct 'target_node' info Dan Williams
2020-02-13  2:28 ` [PATCH v4 0/6] Memory Hierarchy: Enable target node lookups for reserved memory Dan Williams
2020-02-13  9:37   ` Ingo Molnar
2020-02-16 20:00 ` [PATCH v5 " Dan Williams
2020-02-16 20:00   ` [PATCH v5 1/6] ACPI: NUMA: Up-level "map to online node" functionality Dan Williams
2020-02-16 20:00   ` [PATCH v5 2/6] mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online_node() Dan Williams
2020-02-16 20:00   ` [PATCH v5 3/6] powerpc/papr_scm: Switch to numa_map_to_online_node() Dan Williams
2020-02-16 20:01   ` [PATCH v5 4/6] x86/mm: Introduce CONFIG_NUMA_KEEP_MEMINFO Dan Williams
2020-02-17  8:21     ` Thomas Gleixner
2020-02-16 20:01   ` [PATCH v5 5/6] x86/NUMA: Provide a range-to-target_node lookup facility Dan Williams
2020-02-17  8:22     ` Thomas Gleixner [this message]
2020-02-16 20:01   ` [PATCH v5 6/6] libnvdimm/e820: Retrieve and populate correct 'target_node' info Dan Williams

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