On Tue 29-11-16 15:51:14, Sebastian Andrzej Siewior wrote:
> Both iterations over online cpus can be replaced by the proper node
> specific functions.
>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Vlastimil Babka <vbabka@xxxxxxx>
> Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
> Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> Cc: linux-mm@xxxxxxxxx
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
> ---
> v1…v2: take into account that we may have online nodes with no CPUs.
>
> mm/vmstat.c | 16 +++++++++-------
> 1 file changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/mm/vmstat.c b/mm/vmstat.c
> index 0b63ffb5c407..5152cd1c490f 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);
> }
> --
> 2.10.2
--
Michal Hocko
SUSE Labs
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