Justin Hibbits be01018809 powerpc64/mmu: Use a SLIST for the PVO delete list, instead of a RB_TREE
Summary:
Although it's convenient to reuse the pvo_plist for deletion, RB_TREE
insertion and removal is not free, and can result in a lot of extra work
to rebalance the tree.  Instead, use a SLIST as a LIFO delete queue,
which gives us almost free insertion, deletion, and traversal.

Reviewed by:	luporl
Differential Revision: https://reviews.freebsd.org/D21061
2019-08-01 03:55:58 +00:00
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