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hwloc: Add weighted interleave support #662

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hwloc: Add weighted interleave support #662

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9 changes: 9 additions & 0 deletions hwloc/topology-linux.c
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Expand Up @@ -178,6 +178,9 @@ struct hwloc_linux_backend_data_s {
#ifndef MPOL_PREFERRED_MANY
# define MPOL_PREFERRED_MANY 5
#endif
#ifndef MPOL_WEIGHTED_INTERLEAVE
# define MPOL_WEIGHTED_INTERLEAVE 6
#endif
#ifndef MPOL_F_ADDR
# define MPOL_F_ADDR (1<<1)
#endif
Expand Down Expand Up @@ -1674,6 +1677,9 @@ hwloc_linux_membind_policy_from_hwloc(int *linuxpolicy, hwloc_membind_policy_t p
case HWLOC_MEMBIND_INTERLEAVE:
*linuxpolicy = MPOL_INTERLEAVE;
break;
case HWLOC_MEMBIND_WEIGHTED_INTERLEAVE:
*linuxpolicy = MPOL_WEIGHTED_INTERLEAVE;
break;
/* TODO: next-touch when (if?) patch applied upstream */
default:
errno = ENOSYS;
Expand Down Expand Up @@ -1973,6 +1979,9 @@ hwloc_linux_membind_policy_to_hwloc(int linuxpolicy, hwloc_membind_policy_t *pol
case MPOL_INTERLEAVE:
*policy = HWLOC_MEMBIND_INTERLEAVE;
return 0;
case MPOL_WEIGHTED_INTERLEAVE:
*policy = HWLOC_MEMBIND_WEIGHTED_INTERLEAVE;
return 0;
default:
errno = EINVAL;
return -1;
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10 changes: 10 additions & 0 deletions include/hwloc.h
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Expand Up @@ -1705,6 +1705,16 @@ typedef enum {
* \hideinitializer */
HWLOC_MEMBIND_NEXTTOUCH = 4,

/** \brief Allocate memory on the given nodes in an interleaved
* / weighted manner. The precise layout of the memory across
* multiple NUMA nodes is OS/system specific. Weighted interleaving
* can be useful when threads distributed across the specified NUMA
* nodes with different bandwidth capabilities will all be accessing
* the whole memory range concurrently, since the interleave will then
* balance the memory references.
* \hideinitializer */
HWLOC_MEMBIND_WEIGHTED_INTERLEAVE = 5,

/** \brief Returned by get_membind() functions when multiple
* threads or parts of a memory area have differing memory binding
* policies.
Expand Down