Re: [PATCH] mm: Implement Swap Prefetching v22

[KAMEZAWA Hiroyuki]

Hi,
Con Kolivas wrote:
> +void add_to_swapped_list(struct page *page)
> +{
> +	struct swapped_entry *entry;
> +	unsigned long index;
> +
> +	spin_lock(&swapped.lock);
> +	if (swapped.count >= swapped.maxcount) {

Assume x86 system with 8G memory, swapped_maxcount is maybe 5G+ here.
Then, swapped_entry can consume 5G/PAGE_SIZE * 16bytes = 10 M byte more slabs from
ZONE_NORMAL. Could you add check like this?
==
void add_to_swapped_list(struct page *page)
{
	<snip>
	if (!swap_prefetch)
		return;
	spin_lcok(&spwapped.lock);
}
==

Thanks,
-- Kame

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