Mach's external pager mechanism.

Mach IPC's sequence numbering.

GNU Hurd Reference Manual: 4.2 Pager Library.

IRC, freenode, #hurd, 2013-03-04

<braunr> mcsim: is it correct that a pager (as from libpager) object is
  created per file ?
<mcsim> braunr: hello. Yes.
<mcsim> braunr: At least this applies to ext2fs


Writeback: Writing Out Dirty Pages

IRC, freenode, #hurd, 2013-03-04

<braunr> and btw, here is a little update about my roadmap: while reading
  mcsim's patches, i've got to know libpager a bit more, and i think it's
  perfectly possible to add writeback throttling without a heavy rework
<youpi> good :)
<braunr> so i intend to work on that after the pager related patches (large
  store and neal's one) are merged


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