cpuallocator: use clustered allocation only with hybrid cores.

Use explicit cluster info based allocation only on hybrid core
platforms. In other cases omit it altogether only using cache
group based allocation. These should provide identical groups
but for cache groups we do have partial allocation implemented
while for cluster groups we don't have ATM.

Signed-off-by: Krisztian Litkey <krisztian.litkey@intel.com>

pkg/cpuallocator/allocator.go

@@ -1072,11 +1072,17 @@ func (a *allocatorHelper) allocate() cpuset.CPUSet {
 		if (a.flags & AllocIdlePackages) != 0 {
 			a.takeIdlePackages()
 		}
-		if a.cnt > 0 && (a.flags&AllocIdleClusters) != 0 {
-			a.takeIdleClusters()
-		}
-		if a.cnt > 0 && (a.flags&AllocCacheGroups) != 0 {
-			a.takeCacheGroups()
+		if len(a.topology.kind) > 1 {
+			if a.cnt > 0 && (a.flags&AllocIdleClusters) != 0 {
+				a.takeIdleClusters()
+			}
+			if a.cnt > 0 && (a.flags&AllocCacheGroups) != 0 {
+				a.takeCacheGroups()
+			}
+		} else {
+			if a.cnt > 0 && (a.flags&AllocCacheGroups) != 0 {
+				a.takeCacheGroups()
+			}
 		}
 		if a.cnt > 0 && (a.flags&AllocIdleCores) != 0 {
 			a.takeIdleCores()