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SubjectRe: [PATCH 21/22] Use a pre-calculated value instead of num_online_nodes() in fast paths
On Wed, 22 Apr 2009, Mel Gorman wrote:

> diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
> index 848025c..474e73e 100644
> --- a/include/linux/nodemask.h
> +++ b/include/linux/nodemask.h
> @@ -408,6 +408,19 @@ static inline int num_node_state(enum node_states state)
> #define next_online_node(nid) next_node((nid), node_states[N_ONLINE])
>
> extern int nr_node_ids;
> +extern int nr_online_nodes;
> +
> +static inline void node_set_online(int nid)
> +{
> + node_set_state(nid, N_ONLINE);
> + nr_online_nodes = num_node_state(N_ONLINE);
> +}
> +
> +static inline void node_set_offline(int nid)
> +{
> + node_clear_state(nid, N_ONLINE);
> + nr_online_nodes = num_node_state(N_ONLINE);
> +}
> #else
>
> static inline int node_state(int node, enum node_states state)

The later #define's of node_set_online() and node_set_offline() in
include/linux/nodemask.h should probably be removed now.


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