hwlocality_linux_libnuma_ulongs(3) Library Functions Manual
NAME
hwlocality_linux_libnuma_ulongs - Interoperability with Linux libnuma
unsigned long masks
SYNOPSIS
Functions
int hwloc_cpuset_to_linux_libnuma_ulongs (hwloc_topology_t topology,
hwloc_const_cpuset_t cpuset, unsigned long *mask, unsigned long
*maxnode)
int hwloc_nodeset_to_linux_libnuma_ulongs (hwloc_topology_t topology,
hwloc_const_nodeset_t nodeset, unsigned long *mask, unsigned long
*maxnode)
int hwloc_cpuset_from_linux_libnuma_ulongs (hwloc_topology_t topology,
hwloc_cpuset_t cpuset, const unsigned long *mask, unsigned long
maxnode)
int hwloc_nodeset_from_linux_libnuma_ulongs (hwloc_topology_t topology,
hwloc_nodeset_t nodeset, const unsigned long *mask, unsigned long
maxnode)
Detailed Description
This interface helps converting between Linux libnuma unsigned long
masks and hwloc cpusets and nodesets.
Note
Topology topology must match the current machine.
The behavior of libnuma is undefined if the kernel is not NUMA-
aware. (when CONFIG_NUMA is not set in the kernel configuration).
This helper and libnuma may thus not be strictly compatible in this
case, which may be detected by checking whether numa_available()
returns -1.
Function Documentation
int hwloc_cpuset_from_linux_libnuma_ulongs (hwloc_topology_t topology,
hwloc_cpuset_t cpuset, const unsigned long * mask, unsigned long
maxnode) [inline]
Convert the array of unsigned long mask into hwloc CPU set. mask is a
array of unsigned long that will be read. maxnode contains the maximal
node number that may be read in mask.
This function may be used after calling get_mempolicy or any other
function that takes an array of unsigned long as output parameter (and
possibly a maximal node number as input parameter).
Returns
0 on success.
-1 on error, for instance if failing an internal reallocation.
int hwloc_cpuset_to_linux_libnuma_ulongs (hwloc_topology_t topology,
hwloc_const_cpuset_t cpuset, unsigned long * mask, unsigned long *
maxnode) [inline]
Convert hwloc CPU set cpuset into the array of unsigned long mask. mask
is the array of unsigned long that will be filled. maxnode contains the
maximal node number that may be stored in mask. maxnode will be set to
the maximal node number that was found, plus one.
This function may be used before calling set_mempolicy, mbind,
migrate_pages or any other function that takes an array of unsigned
long and a maximal node number as input parameter.
Returns
0.
int hwloc_nodeset_from_linux_libnuma_ulongs (hwloc_topology_t topology,
hwloc_nodeset_t nodeset, const unsigned long * mask, unsigned long
maxnode) [inline]
Convert the array of unsigned long mask into hwloc NUMA node set. mask
is a array of unsigned long that will be read. maxnode contains the
maximal node number that may be read in mask.
This function may be used after calling get_mempolicy or any other
function that takes an array of unsigned long as output parameter (and
possibly a maximal node number as input parameter).
Returns
0 on success.
-1 with errno set to ENOMEM if some internal reallocation failed.
int hwloc_nodeset_to_linux_libnuma_ulongs (hwloc_topology_t topology,
hwloc_const_nodeset_t nodeset, unsigned long * mask, unsigned long *
maxnode) [inline]
Convert hwloc NUMA node set nodeset into the array of unsigned long
mask. mask is the array of unsigned long that will be filled. maxnode
contains the maximal node number that may be stored in mask. maxnode
will be set to the maximal node number that was found, plus one.
This function may be used before calling set_mempolicy, mbind,
migrate_pages or any other function that takes an array of unsigned
long and a maximal node number as input parameter.
Returns
0.
Author
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Hardware Locality (hwloc) Version 2.12.0
hwlocality_linux_libnuma_ulongs(3)
hwloc 2.12.0 - Generated Fri May 9 06:42:39 CDT 2025