hwlocality_linux_libnuma_bitmask(3)

NAME
hwlocality_linux_libnuma_bitmask - Interoperability with Linux libnuma bitmask

  Functions
static struct bitmask * hwloc_cpuset_to_linux_libnuma_bitmask (hwloc_topology_t topology, hwloc_const_cpuset_t cpuset)
static struct bitmask * hwloc_nodeset_to_linux_libnuma_bitmask (hwloc_topology_t topology, hwloc_const_nodeset_t nodeset)
static int hwloc_cpuset_from_linux_libnuma_bitmask (hwloc_topology_t topology, hwloc_cpuset_t cpuset, const struct bitmask *bitmask)
static int hwloc_nodeset_from_linux_libnuma_bitmask (hwloc_topology_t topology, hwloc_nodeset_t nodeset, const struct bitmask *bitmask)

Detailed Description

This interface helps converting between Linux libnuma bitmasks and hwloc cpusets and nodesets.

It also offers a consistent behavior on non-NUMA machines or non-NUMA-aware kernels by assuming that the machines have a single NUMA node.

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

  static int hwloc_cpuset_from_linux_libnuma_bitmask (hwloc_topology_t topology, hwloc_cpuset_t cpuset, const struct bitmask * bitmask) [inline], [static]

Convert libnuma bitmask bitmask into hwloc CPU set cpuset. This function may be used after calling many numa_ functions that use a struct bitmask as an output parameter.

  static struct bitmask * hwloc_cpuset_to_linux_libnuma_bitmask (hwloc_topology_t topology, hwloc_const_cpuset_t cpuset) [static]

Convert hwloc CPU set cpuset into the returned libnuma bitmask. The returned bitmask should later be freed with numa_bitmask_free.

This function may be used before calling many numa_ functions that use a struct bitmask as an input parameter.

Returns:
    newly allocated struct bitmask.

  static int hwloc_nodeset_from_linux_libnuma_bitmask (hwloc_topology_t topology, hwloc_nodeset_t nodeset, const struct bitmask * bitmask) [inline], [static]

Convert libnuma bitmask bitmask into hwloc NUMA node set nodeset. This function may be used after calling many numa_ functions that use a struct bitmask as an output parameter.

  static struct bitmask * hwloc_nodeset_to_linux_libnuma_bitmask (hwloc_topology_t topology, hwloc_const_nodeset_t nodeset) [static]

Convert hwloc NUMA node set nodeset into the returned libnuma bitmask. The returned bitmask should later be freed with numa_bitmask_free.

This function may be used before calling many numa_ functions that use a struct bitmask as an input parameter.

Returns:
    newly allocated struct bitmask.

Author

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