Re: [PATCH 30/35] Skip the PCP list search by counting the orderand type of pages on list

[Christoph Lameter]

On Mon, 16 Mar 2009, Mel Gorman wrote:

>
>  struct per_cpu_pages {
> -	int count;		/* number of pages in the list */
> +	/* The total number of pages on the PCP lists */
> +	int count;
> +
> +	/* Count of each migratetype and order */
> +	u8 mocount[MIGRATE_PCPTYPES][PAGE_ALLOC_COSTLY_ORDER+1];

What about overflow? You could have more than 255 pages of a given type in
a pcp.

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