Commit-ID: 4c501327b4c67f2b874219f20c41d2619b49c78c Gitweb: http://git.kernel.org/tip/4c501327b4c67f2b874219f20c41d2619b49c78c Author: Sebastian Andrzej Siewior <bige...@linutronix.de> AuthorDate: Tue, 29 Nov 2016 15:51:14 +0100 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Fri, 2 Dec 2016 00:52:35 +0100
mm/vmstat: Avoid on each online CPU loops Both iterations over online cpus can be replaced by the proper node specific functions. Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de> Acked-by: Michal Hocko <mho...@suse.com> Cc: linux...@kvack.org Cc: r...@linutronix.de Cc: Johannes Weiner <han...@cmpxchg.org> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Mel Gorman <mgor...@techsingularity.net> Cc: Vlastimil Babka <vba...@suse.cz> Link: http://lkml.kernel.org/r/20161129145113.fn3lw5aazjjvd...@linutronix.de Signed-off-by: Thomas Gleixner <t...@linutronix.de> --- mm/vmstat.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/mm/vmstat.c b/mm/vmstat.c index 0b63ffb..5152cd1 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1720,19 +1720,21 @@ static void __init start_shepherd_timer(void) static void __init init_cpu_node_state(void) { - int cpu; + int node; - for_each_online_cpu(cpu) - node_set_state(cpu_to_node(cpu), N_CPU); + for_each_online_node(node) { + if (cpumask_weight(cpumask_of_node(node)) > 0) + node_set_state(node, N_CPU); + } } static void vmstat_cpu_dead(int node) { - int cpu; + const struct cpumask *node_cpus; - for_each_online_cpu(cpu) - if (cpu_to_node(cpu) == node) - return; + node_cpus = cpumask_of_node(node); + if (cpumask_weight(node_cpus) > 0) + return; node_clear_state(node, N_CPU); }
