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# Design

Mach's [[microkernel/mach/external_pager_mechanism]].

Mach [[microkernel/mach/IPC]]'s [[microkernel/mach/ipc/sequence_numbering]].

[GNU Hurd Reference Manual: 4.2 Pager
Library](http://www.gnu.org/software/hurd/doc/hurd_5.html#SEC32).


## 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


## [[open_issues/multithreading]]

### 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


#### Related

  * LWN, Jonathan Corbet, [*No-I/O dirty
    throttling*](http://lwn.net/Articles/456904/), 2011-08-31.


# Open Issues

  * [[open_issues/linux_vmsig]]