Why nanosleep() sleeps for 50-60us longer than requested? What is timer_slack_ns?

Solution Verified - Updated -

Issue

nanosleep() syscall executed with rather short interval like 1ns-1ms. Why most of the time it will sleep for requested time plus around additional 50..60 us?

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6

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