hi,

i'll merge yamt-pdpolicy branch unless anyone objects.

the branch description from doc/BRANCHES:

	play with page replacement policy
	- separate page replacement policy from the rest of kernel
	- implement alternative replacement policy
	- related read-ahead adjustment?

unless you enable PDPOLICY_CLOCKPRO option, the changes are not intrusive.

btw, i have some test code for the branch.
i've put some of them at ftp://ftp.netbsd.org/pub/NetBSD/misc/yamt/pdsim/.

they include:
- something like !defined(_KERNEL) part of subr_blist.c and
  subr_vmem.c.  ie. for testing the code in userland.
- implementations of other algorithms.  they are for comparison.
- artificial access pattern generator.

some of them are written in C.  some others are written in haskell.

a question: where to put them in the tree?

some choices in my mind:
	- under a new directory, say, src/debugtools.
	- src/sys/uvm.
	- src/regress.
	- /dev/null

wherever it is, i'd like to put them into a single place.
and i don't want to waste much time for them.  they are merely test code,
after all. 

any suggestions?

YAMAMOTO Takashi