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Type: Bug
Resolution: Fixed
Priority: P3
Fix Version/s: 9
Affects Version/s: None
Component/s: core-svc
Labels:
- noreg-hard
- release-note=no

Subcomponent:
java.lang.management
Resolved In Build:
b81
OS:

linux_2.6

Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8142006	emb-9	David Buck	P3	Resolved	Fixed	team
JDK-8140892	8u91	David Buck	P3	Resolved	Fixed	b01
JDK-8133889	8u72	David Buck	P3	Closed	Fixed	b01
JDK-8147224	emb-8u91	David Buck	P3	Resolved	Fixed	b01
JDK-8133929	7u95	David Buck	P3	Closed	Fixed	b01

The code in UnixOperatingSystem.c used to calculate various CPU usage statics depends on out-of-date interpretation of various fields in /proc/stats that no longer hold true since Linux 2.6. This can result in issues like getSystemCpuLoad() reporting 100% CPU consumption for IO heavy loads.

Specifically, we should add irq and sirq to the system CPU time. And we should add IO wait, irq and sirq (all three new fields) to the total time. This is similar to what tools like top and sar do on Linux.

backported by

JDK-8140892 OperatingSystemMXBean reports abnormally high machine CPU consumption on Linux

Resolved

JDK-8142006 OperatingSystemMXBean reports abnormally high machine CPU consumption on Linux

Resolved

JDK-8147224 OperatingSystemMXBean reports abnormally high machine CPU consumption on Linux

Resolved

JDK-8133889 OperatingSystemMXBean reports abnormally high machine CPU consumption on Linux

Closed

JDK-8133929 OperatingSystemMXBean reports abnormally high machine CPU consumption on Linux

Closed

relates to

JDK-8133527 JFR reports abnormally high machine CPU consumption on Linux

Resolved

(1 relates to)

Assignee:: David Buck

Reporter:: David Buck

Votes:: 0 Vote for this issue

Watchers:: 3 Start watching this issue

Created:: 2015-08-14 08:55

Updated:: 2016-01-14 04:45

Resolved:: 2015-08-18 06:43

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