RFR (S): 8200233: Simple G1 evacuation path performance enhancements (original) (raw)
Thomas Schatzl thomas.schatzl at oracle.com
Mon Mar 26 11:48:55 UTC 2018
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Hi all,
can I have reviews for these very tiny (and ultimately note really measureable) improvements to the G1 evacuation path?
They are:
- some stores can be made OOP_NOT_NULL
- the path for compressed/uncompressed oops when popping elements from the task queue during evacuation can be specialized: compressed oops are never array oops so saving the useless test
- some load of the "from" region in the evacuation path can be delayed and in many cases actually avoided
CR: https://bugs.openjdk.java.net/browse/JDK-8200233
Webrev: http://cr.openjdk.java.net/~tschatzl/8200233/webrev/
Testing: hs-tier-1
Thanks, Thomas
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