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DateThu, 27 May 2004 21:25:37 +0200
FromPavel Machek <>
SubjectRe: [PATCH] SMP support for drain local pages.
Hi!

> This patch adds SMP support for drain_local_pages, so that suspend
> implementations can drain pcp structures on all CPUs and thus
> accurately
> determine which pages are free.

Why do you need it, btw?

1st it might be easier to just on_each_cpu(drain_local_pages)
in suspend2

2nd all but one cpus are stopped, right? That mrans that their local pages can't
mess up suspnd's accounting => no need to drain them.
Pavel

2.6.6-current-bk/mm/page_alloc.c
> smp-drain-local-pages/mm/page_alloc.c
> --- 2.6.6-current-bk/mm/page_alloc.c 2004-05-26 19:47:15.000000000
> +1000
> +++ smp-drain-local-pages/mm/page_alloc.c 2004-05-26
> 19:56:19.000000000 +1000
> @@ -459,6 +459,24 @@
> __drain_pages(smp_processor_id());
> local_irq_restore(flags);
> }
> +
> +#ifdef CONFIG_SMP
> +static void __smp_drain_local_pages(void * data)
> +{
> + drain_local_pages();
> +}
> +
> +void smp_drain_local_pages(void)
> +{
> + smp_call_function(__smp_drain_local_pages, NULL, 0, 1);
> + drain_local_pages();
> +}
> +#else
> +void smp_drain_local_pages(void)
> +{
> + drain_local_pages();
> +}
> +#endif
> #endif /* CONFIG_PM */
>
> static void zone_statistics(struct zonelist *zonelist, struct zone
> *z)
>
>
>
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