diff --git a/tools/perf/bench/numa.c b/tools/perf/bench/numa.c
index 11726ec6285f..20b87e29c96f 100644
--- a/tools/perf/bench/numa.c
+++ b/tools/perf/bench/numa.c
@@ -344,18 +344,22 @@ static void mempol_restore(void)
 
 static void bind_to_memnode(int node)
 {
-	unsigned long nodemask;
+	struct bitmask *node_mask;
 	int ret;
 
 	if (node == NUMA_NO_NODE)
 		return;
 
-	BUG_ON(g->p.nr_nodes > (int)sizeof(nodemask)*8);
-	nodemask = 1L << node;
+	node_mask = numa_allocate_nodemask();
+	BUG_ON(!node_mask);
 
-	ret = set_mempolicy(MPOL_BIND, &nodemask, sizeof(nodemask)*8);
-	dprintf("binding to node %d, mask: %016lx => %d\n", node, nodemask, ret);
+	numa_bitmask_clearall(node_mask);
+	numa_bitmask_setbit(node_mask, node);
 
+	ret = set_mempolicy(MPOL_BIND, node_mask->maskp, node_mask->size + 1);
+	dprintf("binding to node %d, mask: %016lx => %d\n", node, *node_mask->maskp, ret);
+
+	numa_bitmask_free(node_mask);
 	BUG_ON(ret);
 }
 
@@ -876,8 +880,6 @@ static void update_curr_cpu(int task_nr, unsigned long bytes_worked)
 	prctl(0, bytes_worked);
 }
 
-#define MAX_NR_NODES	64
-
 /*
  * Count the number of nodes a process's threads
  * are spread out on.
@@ -888,10 +890,15 @@ static void update_curr_cpu(int task_nr, unsigned long bytes_worked)
  */
 static int count_process_nodes(int process_nr)
 {
-	char node_present[MAX_NR_NODES] = { 0, };
+	char *node_present;
 	int nodes;
 	int n, t;
 
+	node_present = (char *)malloc(g->p.nr_nodes * sizeof(char));
+	BUG_ON(!node_present);
+	for (nodes = 0; nodes < g->p.nr_nodes; nodes++)
+		node_present[nodes] = 0;
+
 	for (t = 0; t < g->p.nr_threads; t++) {
 		struct thread_data *td;
 		int task_nr;
@@ -901,17 +908,20 @@ static int count_process_nodes(int process_nr)
 		td = g->threads + task_nr;
 
 		node = numa_node_of_cpu(td->curr_cpu);
-		if (node < 0) /* curr_cpu was likely still -1 */
+		if (node < 0) /* curr_cpu was likely still -1 */ {
+			free(node_present);
 			return 0;
+		}
 
 		node_present[node] = 1;
 	}
 
 	nodes = 0;
 
-	for (n = 0; n < MAX_NR_NODES; n++)
+	for (n = 0; n < g->p.nr_nodes; n++)
 		nodes += node_present[n];
 
+	free(node_present);
 	return nodes;
 }
 
@@ -980,7 +990,7 @@ static void calc_convergence(double runtime_ns_max, double *convergence)
 {
 	unsigned int loops_done_min, loops_done_max;
 	int process_groups;
-	int nodes[MAX_NR_NODES];
+	int *nodes;
 	int distance;
 	int nr_min;
 	int nr_max;
@@ -994,6 +1004,8 @@ static void calc_convergence(double runtime_ns_max, double *convergence)
 	if (!g->p.show_convergence && !g->p.measure_convergence)
 		return;
 
+	nodes = (int *)malloc(g->p.nr_nodes * sizeof(int));
+	BUG_ON(!nodes);
 	for (node = 0; node < g->p.nr_nodes; node++)
 		nodes[node] = 0;
 
@@ -1035,8 +1047,10 @@ static void calc_convergence(double runtime_ns_max, double *convergence)
 
 	BUG_ON(sum > g->p.nr_tasks);
 
-	if (0 && (sum < g->p.nr_tasks))
+	if (0 && (sum < g->p.nr_tasks)) {
+		free(nodes);
 		return;
+	}
 
 	/*
 	 * Count the number of distinct process groups present
@@ -1088,6 +1102,8 @@ static void calc_convergence(double runtime_ns_max, double *convergence)
 		}
 		tprintf("\n");
 	}
+
+	free(nodes);
 }
 
 static void show_summary(double runtime_ns_max, int l, double *convergence)
@@ -1413,7 +1429,7 @@ static int init(void)
 	g->p.nr_nodes = numa_max_node() + 1;
 
 	/* char array in count_process_nodes(): */
-	BUG_ON(g->p.nr_nodes > MAX_NR_NODES || g->p.nr_nodes < 0);
+	BUG_ON(g->p.nr_nodes < 0);
 
 	if (g->p.show_quiet && !g->p.show_details)
 		g->p.show_details = -1;