K 10
svn:author
V 5
peter
K 8
svn:date
V 27
2001-08-25T05:00:44.000000Z
K 7
svn:log
V 537
Implement idle zeroing of pages.  I've been tinkering with this
on and off since John Dyson left his work-in-progress.

It is off by default for now.  sysctl vm.zeroidle_enable=1 to turn it on.

There are some hacks here to deal with the present lack of preemption - we
yield after doing a small number of pages since we wont preempt otherwise.

This is basically Matt's algorithm [with hysteresis] with an idle process
to call it in a similar way it used to be called from the idle loop.

I cleaned up the includes a fair bit here too.

END