kswapd0 consuming 50% of cpu

[JD]

Is this normal for the kswapd to consume 50% of cpu?
And why would it do that?
This is the first time I have seen this.
Kernel is kernel-3.6.6-1.fc16

    24 root      20   0     0    0    0 R 50.1  0.0 117:08.40 kswapd0