> What are "blist", "alloc-to-free" and what O(n*n) behaviour?

blist:
http://www.FreeBSD.org/cgi/cvsweb.cgi/src/sys/kern/subr_blist.c?rev=1.17&content-type=text/x-cvsweb-markup

alloc-to-free:
see uvm_swap_alloc() and subr_extent.c.

O(n*n) behaviour:
see a comment in amap_wipeout().

YAMAMOTO Takashi