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

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Message-ID: <2f11576a0808210031r372c12bau7c94d86f2c9120d4@mail.gmail.com>
Date:	Thu, 21 Aug 2008 16:31:31 +0900
From:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"David Miller" <davem@...emloft.net>, 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

>> 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);
>  }

Thank you!!
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