Commit b55032f1 authored by Yury Norov's avatar Yury Norov
Browse files

mm/vmstat: replace cpumask_weight with cpumask_empty where appropriate 



mm/vmstat.c code calls cpumask_weight() to check if any bit of a given
cpumask is set. We can do it more efficiently with cpumask_empty() because
cpumask_empty() stops traversing the cpumask as soon as it finds first set
bit, while cpumask_weight() counts all bits unconditionally.

Signed-off-by: default avatarYury Norov <yury.norov@gmail.com>
Acked-by: default avatarMike Rapoport <rppt@linux.ibm.com>
parent 95e3a973

mm/vmstat.c

+2 −2
Original line number Diff line number Diff line
@@ -2042,7 +2042,7 @@ static void __init init_cpu_node_state(void) 
	int node;



	for_each_online_node(node) {

		if (cpumask_weight(cpumask_of_node(node)) > 0)

		if (!cpumask_empty(cpumask_of_node(node)))

			node_set_state(node, N_CPU);

	}

}
@@ -2074,7 +2074,7 @@ static int vmstat_cpu_dead(unsigned int cpu) 


	refresh_zone_stat_thresholds();

	node_cpus = cpumask_of_node(node);

	if (cpumask_weight(node_cpus) > 0)

	if (!cpumask_empty(node_cpus))

		return 0;



	node_clear_state(node, N_CPU);