linux-kernel - Re: [PATCH 25/25] Use a pre-calculated value instead of num_online

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Message-Id: <1240301300.771.58.camel@penberg-laptop>
Date:	Tue, 21 Apr 2009 11:08:20 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
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>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 25/25] Use a pre-calculated value instead of
 num_online_nodes() in fast paths

On Mon, 2009-04-20 at 23:20 +0100, Mel Gorman wrote:
> diff --git a/mm/slab.c b/mm/slab.c
> index 1c680e8..41d1343 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -3579,7 +3579,7 @@ static inline void __cache_free(struct kmem_cache *cachep, void *objp)
>  	 * variable to skip the call, which is mostly likely to be present in
>  	 * the cache.
>  	 */
> -	if (numa_platform && cache_free_alien(cachep, objp))
> +	if (numa_platform > 1 && cache_free_alien(cachep, objp))
>  		return;

This doesn't look right. I assume you meant "nr_online_nodes > 1" here?
If so, please go ahead and remove "numa_platform" completely.


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