K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2016-07-22T23:13:25.333753Z
K 7
svn:log
V 767
Simplify the background laundering code and make it less aggressive.

- Remove the free page threshold for background laundering. It doesn't
  really add anything: we only start background laundering if the
  pagedaemon has been woken up recently, which means that the free page
  count dipped below the pagedaemon wakeup threshold.
- Reduce the maximum background laundering rate to 8MB/s. In HEAD, we
  will launder at most 32 * 16 pages * 2 pdwakeups/s = 4 MB/s during a
  first pass over the inactive queue.
- When laundering, use a target of

  0.1 * l(I)/l(L) * (free target - wakeup thresh)

  instead of

  0.5 * l(I)/l(L) * free target

  so that we effectively launder pages at a tenth the rate that they're
  reclaimed by the pagedaemon.

Reviewed by:	alc

END