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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>
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