migration/4 migration 4 is using too much CPU

top - 13:02:52 up 603 days, 19:19,  2 users,  load average: 5.01, 4.15, 3.44
Tasks: 604 total,   5 running, 599 sleeping,   0 stopped,   0 zombie
Cpu(s): 17.7%us, 36.1%sy,  0.0%ni, 42.0%id,  4.1%wa,  0.0%hi,  0.2%si,  0.0%st
Mem:  16278908k total,  4269684k used, 12009224k free,   119672k buffers
Swap:        8k total,        8k used,        0k free,  1802992k cached

    PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                            
 273765 root      20   0  102m  680  572 R 36.1  0.0   7:23.08 swapoff                                            
 410417 501       20   0  229m  53m 1784 S 26.1  0.3   0:13.60 imap                                               
     19 root      RT   0     0    0    0 S 37.9  0.0 217:19.08 migration/4  



migration/4   migration 4 is using too much CPU but not sure why.  I think it was due to heavy IO or swapping at the time possibly.

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