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

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Date:	Thu, 21 Aug 2008 11:32:34 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>, kosaki.motohiro@...fujitsu.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	cl@...ux-foundation.org, tokunaga.keiich@...fujitsu.com,
	travis <travis@....com>
Subject: Re: [RFC][PATCH 2/2] quicklist shouldn't be proportional to # of
	CPUs

On Thu, 2008-08-21 at 00:27 -0700, Andrew Morton wrote:
> On Thu, 21 Aug 2008 00:13:22 -0700 (PDT) David Miller <davem@...emloft.net> 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));
> > > 
> > > 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 :-)
> 
> Seems to compile OK on x86_32, x86_64, ia64 and powerpc for some reason.
> 
> This seems to fix things on sparc64:
> 
> --- a/mm/quicklist.c~mm-quicklist-shouldnt-be-proportional-to-number-of-cpus-fix
> +++ a/mm/quicklist.c
> @@ -28,7 +28,7 @@ static unsigned long max_pages(unsigned 
>  	unsigned long node_free_pages, max;
>  	int node = numa_node_id();
>  	struct zone *zones = NODE_DATA(node)->node_zones;
> -	int num_cpus_per_node;
> +	cpumask_t node_cpumask;
>  
>  	node_free_pages =
>  #ifdef CONFIG_ZONE_DMA
> @@ -41,8 +41,8 @@ static unsigned long max_pages(unsigned 
>  
>  	max = node_free_pages / FRACTION_OF_NODE_MEM;
>  
> -	num_cpus_per_node = cpus_weight_nr(node_to_cpumask(node));
> -	max /= num_cpus_per_node;
> +	node_cpumask = node_to_cpumask(node);
> +	max /= cpus_weight_nr(node_cpumask);
>  
>  	return max(max, min_pages);
>  }

humm, I thought we wanted to keep cpumask_t stuff away from our stack -
since on insanely large SGI boxen (/me looks at mike) the thing becomes
512 bytes.

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