https://bugzilla.wikimedia.org/show_bug.cgi?id=69667

--- Comment #12 from Andrew Otto <o...@wikimedia.org> ---
This happened again on 2014-09-06 around 19:43:22.  Here are some relevant sar
captures:

https://gist.github.com/ottomata/ae372649afc914a6f606

Something is happening with paging stats, but it is unclear if it is a syptom
or a cause.

Starting around 19:43:11, pages are being freed up really fast.  Then, at
19:43:22, activity drops out, as if activity is blocked by something.  At
19:43:33, a ton more pages are freed all at once  Then it seems to go back to
normal.


Seeing as the actual block starts at around :22, and there is weird behavior
before that, maybe paging is part of the cause.

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