linux-kernel - Re: [RFC][PATCH 2/2] quicklist shouldn't be proportional to # of CPUs

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Date:	Mon, 25 Aug 2008 11:40:29 -0700
From:	Mike Travis <travis@....com>
To:	David Miller <davem@...emloft.net>
CC:	akpm@...ux-foundation.org, kosaki.motohiro@...fujitsu.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	cl@...ux-foundation.org, tokunaga.keiich@...fujitsu.com
Subject: Re: [RFC][PATCH 2/2] quicklist shouldn't be proportional to # of
 CPUs

David Miller wrote:
> From: Andrew Morton <akpm@...ux-foundation.org>
> Date: Wed, 20 Aug 2008 23:46:15 -0700
> 
>> On Wed, 20 Aug 2008 20:08:13 +0900 KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
>>
>>> +	num_cpus_per_node = cpus_weight_nr(node_to_cpumask(node));

I think the more correct usage would be:

	{
		node_to_cpumask_ptr(v, node);
		num_cpus_per_node = cpus_weight_nr(*v);
		max /= num_cpus_per_node;

		return max(max, min_pages);
	}

which should load 'v' with a pointer to the node_to_cpumask_map[node] entry
[and avoid using stack space for the cpumask_t variable for those arch's
that define a node_to_cpumask_map (or similar).]  Otherwise a local cpumask_t
variable '_v' is created to which 'v' is pointing to and thus can be used
directly as an arg to the cpu_xxx ops.

Thanks,
Mike


>> sparc64 allmodconfig:
>>
>> mm/quicklist.c: In function `max_pages':
>> mm/quicklist.c:44: error: invalid lvalue in unary `&'
>>
>> we seem to have a made a spectacular mess of cpumasks lately.
> 
> It should explode similarly on x86, since it also defines node_to_cpumask()
> as an inline function.
> 
> IA64 seems to be one of the few platforms to define this as a macro
> evaluating to the node-to-cpumask array entry, so it's clear what
> platform Motohiro-san did build testing on :-)
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