linux-kernel - Re: [PATCH 21/22] Use a pre-calculated value instead of num_online

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Date:	Wed, 22 Apr 2009 16:04:47 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Mel Gorman <mel@....ul.ie>
cc:	Linux Memory Management List <linux-mm@...ck.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lin Ming <ming.m.lin@...el.com>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [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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