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Subcomponent:
gc
Compatibility Kind:

behavioral
Compatibility Risk:
minimal
Compatibility Risk Description:

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The removed Java process performance counters will not be available any more through the relevant APIs.
They are unlikely to be used, a Google search doesn't find anything relevant and with current JDK can only be accessed via a jdk.internal API or via jcmd. So wide exposure to the public of the Perf counters and these in particular is very unlikely.

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The removed Java process performance counters will not be available any more through the relevant APIs. They are unlikely to be used, a Google search doesn't find anything relevant and with current JDK can only be accessed via a jdk.internal API or via jcmd. So wide exposure to the public of the Perf counters and these in particular is very unlikely.
Interface Kind:

Other
Scope:
Implementation

Summary

Remove two unimplemented TLAB performance counters: sun.gc.tlab.fastWaste and sun.gc.tlab.maxFastWaste.

These two counters are obsolete and have always returned constant 0 values for many years.

Remove those two counters.

No specification change.

csr of

JDK-8234532 Remove ThreadLocalAllocBuffer::_fast_refill_waste since it is never set