CPU statistics are unreliable for short sleeping tasks

Solution Unverified - Updated -

Issue

  • CPU system level statistics are unreliable - short sleeping tasks such as those using select(), pause(), nanosleep() or poll() with a short timeout do not show up in top and do not accumulate any user or system CPU time.

Environment

  • Red Hat Enterprise Linux 4.

  • Red Hat Enterprise Linux 5.

  • Red Hat Enterprise Linux 6 and upstream kernels are less affected (though still not right).

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