RFR: 8257145: Performance regression with -XX:-ResizePLAB after JDK-8079555 [v6]

[Dongbo He]

> Hi,
> 
> this is the continuation of the review of the implementation for:
> 
> https://bugs.openjdk.java.net/browse/JDK-8257145

Dongbo He has updated the pull request incrementally with one additional commit since the last revision:

  fix failure in test/hotspot/jtreg/gc/g1/plab/TestPLABPromotion.java

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1474/files
  - new: https://git.openjdk.java.net/jdk/pull/1474/files/17aab275..5aabcc31

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1474&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1474&range=04-05

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1474.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1474/head:pull/1474

PR: https://git.openjdk.java.net/jdk/pull/1474