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numa: Introduce virNumaGetMaxNode and use it instead of numa_max_node
Avoid necessary checks for the numa library with this helper.
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@ -1523,6 +1523,7 @@ virNodeSuspendGetTargetMask;
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virDomainNumatuneMemModeTypeFromString;
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virDomainNumatuneMemModeTypeToString;
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virNumaGetAutoPlacementAdvice;
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virNumaGetMaxNode;
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virNumaIsAvailable;
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virNumaSetupMemoryPolicy;
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virNumaTuneMemPlacementModeTypeFromString;
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@ -988,25 +988,21 @@ int nodeGetMemoryStats(int cellNum ATTRIBUTE_UNUSED,
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int ret;
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char *meminfo_path = NULL;
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FILE *meminfo;
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int max_node;
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if (cellNum == VIR_NODE_MEMORY_STATS_ALL_CELLS) {
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if (VIR_STRDUP(meminfo_path, MEMINFO_PATH) < 0)
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return -1;
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} else {
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if (!virNumaIsAvailable()) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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"%s", _("NUMA not supported on this host"));
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if ((max_node = virNumaGetMaxNode()) < 0)
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return -1;
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}
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# if WITH_NUMACTL
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if (cellNum > numa_max_node()) {
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if (cellNum > max_node) {
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virReportInvalidArg(cellNum,
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_("cellNum in %s must be less than or equal to %d"),
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__FUNCTION__, numa_max_node());
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__FUNCTION__, max_node);
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return -1;
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}
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# endif
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if (virAsprintf(&meminfo_path, "%s/node/node%d/meminfo",
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SYSFS_SYSTEM_PATH, cellNum) < 0)
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@ -1609,31 +1605,35 @@ nodeCapsInitNUMA(virCapsPtr caps)
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virCapsHostNUMACellCPUPtr cpus = NULL;
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int ret = -1;
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int max_n_cpus = NUMA_MAX_N_CPUS;
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int mask_n_bytes = max_n_cpus / 8;
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int ncpus = 0;
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bool topology_failed = false;
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int max_node;
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if (!virNumaIsAvailable())
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return nodeCapsInitNUMAFake(caps);
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int mask_n_bytes = max_n_cpus / 8;
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if ((max_node = virNumaGetMaxNode()) < 0)
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goto cleanup;
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if (VIR_ALLOC_N(mask, mask_n_bytes / sizeof(*mask)) < 0)
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goto cleanup;
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if (VIR_ALLOC_N(allonesmask, mask_n_bytes / sizeof(*mask)) < 0)
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goto cleanup;
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memset(allonesmask, 0xff, mask_n_bytes);
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for (n = 0; n <= numa_max_node(); n++) {
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for (n = 0; n <= max_node; n++) {
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size_t i;
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/* The first time this returns -1, ENOENT if node doesn't exist... */
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if (numa_node_to_cpus(n, mask, mask_n_bytes) < 0) {
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VIR_WARN("NUMA topology for cell %d of %d not available, ignoring",
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n, numa_max_node()+1);
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n, max_node + 1);
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continue;
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}
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/* second, third... times it returns an all-1's mask */
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if (memcmp(mask, allonesmask, mask_n_bytes) == 0) {
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VIR_DEBUG("NUMA topology for cell %d of %d is all ones, ignoring",
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n, numa_max_node()+1);
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n, max_node + 1);
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continue;
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}
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@ -1688,7 +1688,9 @@ nodeGetCellsFreeMemory(unsigned long long *freeMems,
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return nodeGetCellsFreeMemoryFake(freeMems,
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startCell, maxCells);
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maxCell = numa_max_node();
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if ((maxCell = virNumaGetMaxNode()) < 0)
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return 0;
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if (startCell > maxCell) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("start cell %d out of range (0-%d)"),
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@ -1716,13 +1718,16 @@ unsigned long long
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nodeGetFreeMemory(void)
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{
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unsigned long long freeMem = 0;
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int max_node;
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int n;
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if (!virNumaIsAvailable())
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return nodeGetFreeMemoryFake();
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if ((max_node = virNumaGetMaxNode()) < 0)
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return 0;
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for (n = 0; n <= numa_max_node(); n++) {
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for (n = 0; n <= max_node; n++) {
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long long mem;
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if (numa_node_size64(n, &mem) < 0)
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continue;
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@ -1750,7 +1755,9 @@ static unsigned long long nodeGetCellMemory(int cell)
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int maxCell;
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/* Make sure the provided cell number is valid. */
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maxCell = numa_max_node();
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if ((maxCell = virNumaGetMaxNode()) < 0)
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return 0;
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if (cell > maxCell) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("cell %d out of range (0-%d)"),
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@ -174,6 +174,34 @@ virNumaIsAvailable(void)
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{
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return numa_available() != -1;
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}
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/**
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* virNumaGetMaxNode:
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* Get the highest node number available on the current system.
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* (See the node numbers in /sys/devices/system/node/ ).
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*
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* Returns the highes NUMA node id on success, -1 on error.
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*/
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int
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virNumaGetMaxNode(void)
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{
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int ret;
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if (!virNumaIsAvailable()) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("NUMA isn't available on this host"));
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return -1;
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}
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if ((ret = numa_max_node()) < 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("Failed to request maximum NUMA node id"));
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return -1;
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}
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return ret;
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}
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#else
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int
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virNumaSetupMemoryPolicy(virNumaTuneDef numatune,
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@ -195,4 +223,13 @@ virNumaIsAvailable(void)
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{
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return false;
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}
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int
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virNumaGetMaxNode(void)
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{
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("NUMA isn't available on this host"));
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return -1;
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}
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#endif
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@ -57,4 +57,6 @@ int virNumaSetupMemoryPolicy(virNumaTuneDef numatune,
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virBitmapPtr nodemask);
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bool virNumaIsAvailable(void);
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int virNumaGetMaxNode(void);
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#endif /* __VIR_NUMA_H__ */
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