I just saw this issue again on 3.8.0-9.  Current memory usage (after the
swap storm calmed down):

$ free
             total       used       free     shared    buffers     cached
Mem:       3842480    3735332     107148          0       4216    1133784
-/+ buffers/cache:    2597332    1245148
Swap:      6291452     682164    5609288
$

vm.swappiness=30.  The flash blocker extension is still in place in my
browser.

It seems like the kernel is somehow unhappy to let its page cache drop
below 1.2GB in size, and tries really hard to prevent that by swapping
other things around?

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https://bugs.launchpad.net/bugs/1152736

Title:
  system swapping itself to death in raring for no good reason

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