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SubjectRe: [RFC][PATCH 2/2] quicklist shouldn't be proportional to # of CPUs
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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@davemloft.net> wrote:
>
> > From: Andrew Morton <akpm@linux-foundation.org>
> > Date: Wed, 20 Aug 2008 23:46:15 -0700
> >
> > > On Wed, 20 Aug 2008 20:08:13 +0900 KOSAKI Motohiro <kosaki.motohiro@jp.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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