Jason Evans 45f087eb03 Revert "Remove BITMAP_USE_TREE."
Some systems use a native 64 KiB page size, which means that the bitmap
for the smallest size class can be 8192 bits, not just 512 bits as when
the page size is 4 KiB.  Linear search in bitmap_{sfu,ffu}() is
unacceptably slow for such large bitmaps.

This reverts commit 7c00f04ff40a34627e31488d02ff1081c749c7ba.
2017-04-18 19:01:04 -07:00
..
2017-04-18 19:01:04 -07:00