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mm: swap: allocate swap slots from swap tiers
The slow allocation path walks swap_avail_head, one plist of every available swap device, ordered by priority. Give each tier its own list of available devices instead. The slow path now walks the ti
The slow allocation path walks swap_avail_head, one plist of every available swap device, ordered by priority. Give each tier its own list of available devices instead. The slow path now walks the ti