[3.13 regression] kswapd0 and ksoftirqd/0 CPU hogs

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Since updating my ARAnym VMs from 3.12.16 to 3.13.11 I see kswapd0
and ksoftirqd/0 consume inordinate amounts of CPU.  kswapd0 often
rises to about 30-50% CPU even though RAM shouldn't be anywhere near
depleted (768GB, a gcc bootstrap running in a screen session).
kswapd0 tends to stay this way until I drop caches, but doing that
doesn't always fix it.  I also sometimes see ksoftirqd/0 consume
5-30% CPU.

Reverting to 3.12.16 completely eliminates these problems.

I haven't tested 3.14 or 3.15-rc yet.

/Mikael
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