IRC, freenode, #hurd, 2011-09-09

<slpz> It's amazing how broken some parts of Mach's VM are
<slpz> currently, it doesn't even keep track of the number of external
  pages in the lists
<slpz> and vm_pageout_scan produces a hang if want_pages == FALSE (which
  never is, because vm_page_external_count is always 0)