mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
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Dan Williams
5d30f92e76
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 <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: <[email protected]> Cc: Andrew Morton <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: Michal Hocko <[email protected]> Reported-by: kbuild test robot <[email protected]> Reviewed-by: Ingo Molnar <[email protected]> Signed-off-by: Dan Williams <[email protected]> Reviewed-by: Thomas Gleixner <[email protected]> Link: https://lore.kernel.org/r/158188326978.894464.217282995221175417.stgit@dwillia2-desk3.amr.corp.intel.com
45 lines
900 B
C
45 lines
900 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_NUMA_H
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#define _LINUX_NUMA_H
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#include <linux/types.h>
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#ifdef CONFIG_NODES_SHIFT
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#define NODES_SHIFT CONFIG_NODES_SHIFT
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#else
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#define NODES_SHIFT 0
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#endif
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#define MAX_NUMNODES (1 << NODES_SHIFT)
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#define NUMA_NO_NODE (-1)
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/* optionally keep NUMA memory info available post init */
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#ifdef CONFIG_NUMA_KEEP_MEMINFO
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#define __initdata_or_meminfo
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#else
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#define __initdata_or_meminfo __initdata
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#endif
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#ifdef CONFIG_NUMA
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/* Generic implementation available */
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int numa_map_to_online_node(int node);
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/*
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* Optional architecture specific implementation, users need a "depends
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* on $ARCH"
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*/
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int phys_to_target_node(phys_addr_t addr);
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#else
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static inline int numa_map_to_online_node(int node)
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{
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return NUMA_NO_NODE;
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}
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static inline int phys_to_target_node(phys_addr_t addr)
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{
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return NUMA_NO_NODE;
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}
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#endif
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#endif /* _LINUX_NUMA_H */
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