JDK-8143557 : Release Note: JFR reports abnormally high machine CPU consumption on Linux
  • Type: Sub-task
  • Component: hotspot
  • Sub-Component: jfr
  • Affected Version: 7u95,8u72,9
  • Priority: P4
  • Status: Closed
  • Resolution: Delivered
  • Submitted: 2015-11-20
  • Updated: 2022-06-14
  • Resolved: 2017-04-20
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Resolved: Release in which this issue/RFE has been resolved.
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7u95Resolved 8u72Resolved
On Linux kernels 2.6 and later, the JDK would include time spent waiting for IO completion as "CPU usage". During periods of heavy IO activity, this could result in misleadingly high values reported as CPU consumption in various tools like Flight Recorder and performance counters. This issue has been resolved.
Release Notes have been updated with the link to the bug (JDK-8133527) instead of “(Not Public).”

Release Notes for 7u95 and 8u72 have been updated with this content.