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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: Yury Norov <yury.norov@gmail.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
This commit is contained in:
Yury Norov 2022-01-23 10:38:56 -08:00
parent 95e3a97387
commit b55032f106
1 changed files with 2 additions and 2 deletions
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4
mm/vmstat.c
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@ -2042,7 +2042,7 @@ static void __init init_cpu_node_state(void)
int node; int node;
for_each_online_node(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); node_set_state(node, N_CPU);
} }
} }
@ -2074,7 +2074,7 @@ static int vmstat_cpu_dead(unsigned int cpu)
refresh_zone_stat_thresholds(); refresh_zone_stat_thresholds();
node_cpus = cpumask_of_node(node); node_cpus = cpumask_of_node(node);
if (cpumask_weight(node_cpus) > 0) if (!cpumask_empty(node_cpus))
return 0; return 0;
node_clear_state(node, N_CPU); node_clear_state(node, N_CPU);