Andrew Morton wrote:

Nick Piggin [off-list ref] wrote:

quoted

It allows two scans at the two lowest priorities before breaking out or
doing a blk_congestion_wait, for both try_to_free_pages and balance_pgdat.

This seems to be fairly equivalent to simply subtracting one from
DEF_PRIORITY.

Sort of - except in the case where nr_inactive >> priority
is less than nr_pages*2. Oh and this also allows another
shot at refilling the inactive list.

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