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util: Introduce virNumaNodesetToCPUset()

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This helper converts a set of NUMA node to the set of CPUs
they contain.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Andrea Bolognani 2019-05-30 18:01:35 +02:00
parent 1b2ac8010c
commit 2d2b26f96f
3 changed files with 58 additions and 0 deletions
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1
src/libvirt_private.syms
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@ -2556,6 +2556,7 @@ virNumaGetPages;
virNumaIsAvailable;
virNumaNodeIsAvailable;
virNumaNodesetIsAvailable;
virNumaNodesetToCPUset;
virNumaSetPagePoolSize;
virNumaSetupMemoryPolicy;

55
src/util/virnuma.c
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@ -297,6 +297,49 @@ virNumaGetNodeCPUs(int node,
# undef MASK_CPU_ISSET
# undef n_bits
/**
* virNumaNodesetToCPUset:
* @nodeset: bitmap containing a set of NUMA nodes
* @cpuset: return location for a bitmap containing a set of CPUs
*
* Convert a set of NUMA node to the set of CPUs they contain.
*
* Returns 0 on success, <0 on failure.
*/
int
virNumaNodesetToCPUset(virBitmapPtr nodeset,
virBitmapPtr *cpuset)
{
VIR_AUTOPTR(virBitmap) allNodesCPUs = NULL;
size_t nodesetSize;
size_t i;
*cpuset = NULL;
if (!nodeset)
return 0;
allNodesCPUs = virBitmapNewEmpty();
nodesetSize = virBitmapSize(nodeset);
for (i = 0; i < nodesetSize; i++) {
VIR_AUTOPTR(virBitmap) nodeCPUs = NULL;
if (!virBitmapIsBitSet(nodeset, i))
continue;
if (virNumaGetNodeCPUs(i, &nodeCPUs) < 0)
return -1;
if (virBitmapUnion(allNodesCPUs, nodeCPUs) < 0)
return -1;
}
VIR_STEAL_PTR(*cpuset, allNodesCPUs);
return 0;
}
#else /* !WITH_NUMACTL */
int
@ -351,6 +394,18 @@ virNumaGetNodeCPUs(int node ATTRIBUTE_UNUSED,
_("NUMA isn't available on this host"));
return -1;
}
int
virNumaNodesetToCPUset(virBitmapPtr nodeset ATTRIBUTE_UNUSED,
virBitmapPtr *cpuset)
{
*cpuset = NULL;
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("NUMA isn't available on this host"));
return -1;
}
#endif /* !WITH_NUMACTL */
/**

2
src/util/virnuma.h
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@ -48,6 +48,8 @@ int virNumaGetNodeMemory(int node,
unsigned int virNumaGetMaxCPUs(void);
int virNumaGetNodeCPUs(int node, virBitmapPtr *cpus) ATTRIBUTE_NOINLINE;
int virNumaNodesetToCPUset(virBitmapPtr nodeset,
virBitmapPtr *cpuset);
int virNumaGetPageInfo(int node,
unsigned int page_size,