I see lots of those on my production server, they come and go and take up lots of CPU time

 PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 17 root RT 0 0 0 0 S 1661 0.0 4728:03 migration/3 29 root RT 0 0 0 0 S 1508 0.0 4728:03 migration/6

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2 Answers

The migration kernel process distributes workload across CPU cores. You should have one migration process per processor core.

"migration" is a kernel process

Check here

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