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| author |   Dan Williams <dan.j.williams@intel.com> | 2020-02-16 12:00:48 -0800 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2020-02-17 10:49:06 -0800 |
| commit | b2ca916ce392a9d4cea3489a3efb2b627b839eaf (patch) | |
| tree | e60ba3dc33b63e5645c504680d1aba6759cb1bcb /include/linux/numa.h | |
| parent | Linux 5.6-rc1 (diff) | |
| download | wireguard-linux-b2ca916ce392a9d4cea3489a3efb2b627b839eaf.tar.xz wireguard-linux-b2ca916ce392a9d4cea3489a3efb2b627b839eaf.zip | |
ACPI: NUMA: Up-level "map to online node" functionality
The acpi_map_pxm_to_online_node() helper is used to find the closest
online node to a given proximity domain. This is used to map devices in
a proximity domain with no online memory or cpus to the closest online
node and populate a device's 'numa_node' property. The numa_node
property allows applications to be migrated "close" to a resource.
In preparation for providing a generic facility to optionally map an
address range to its closest online node, or the node the range would
represent were it to be onlined (target_node), up-level the core of
acpi_map_pxm_to_online_node() to a generic mm/numa helper.
Cc: Michal Hocko <mhocko@suse.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/r/158188324802.894464.13128795207831894206.stgit@dwillia2-desk3.amr.corp.intel.com
Diffstat (limited to 'include/linux/numa.h')
| -rw-r--r-- | include/linux/numa.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/numa.h b/include/linux/numa.h index 110b0e5d0fb0..20f4e44b186c 100644 --- a/include/linux/numa.h +++ b/include/linux/numa.h @@ -13,4 +13,13 @@ #define NUMA_NO_NODE (-1) +#ifdef CONFIG_NUMA +int numa_map_to_online_node(int node); +#else +static inline int numa_map_to_online_node(int node) +{ + return NUMA_NO_NODE; +} +#endif + #endif /* _LINUX_NUMA_H */ |