Nick Piggin [off-list ref] wrote:

+	if (zone->nr_active >= zone->nr_inactive*4)
 +		/* ratio will be >= 2 */
 +		imbalance = 8*nr_pages;
 +	else if (zone->nr_active >= zone->nr_inactive*2)
 +		/* 1 < ratio < 2 */
 +		imbalance = 4*nr_pages*zone->nr_active / (zone->nr_inactive*2);

This can cause a divide-by-zero, yes?
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