linux-kernel - Re: [PATCH 08/10] x86: Change NR_CPUS arrays in numa

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Date:	Tue, 15 Jan 2008 11:54:12 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	travis@....com
Cc:	Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu,
	Christoph Lameter <clameter@....com>,
	Jack Steiner <steiner@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/10] x86: Change NR_CPUS arrays in numa_64 V2

travis@....com writes:
> +
>  /* Returns the number of the node containing CPU 'cpu' */
>  static inline int cpu_to_node(int cpu)
>  {
> -	return cpu_to_node_map[cpu];
> +	u16 *cpu_to_node_map = x86_cpu_to_node_map_early_ptr;
> +
> +	if (cpu_to_node_map)
> +		return cpu_to_node_map[cpu];
> +	else if(per_cpu_offset(cpu))
> +		return per_cpu(x86_cpu_to_node_map, cpu);
> +	else
> +		return NUMA_NO_NODE;

Seems a little big now to be still inlined.

Also I wonder if there are really that many early callers that it
isn't feasible to just convert them to a early_cpu_to_node(). Also
early_cpu_to_node() should really not be speed critical, so just
linearly searching some other table instead of setting up an explicit
array should be fine for that.

-Andi
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