RFR (round 3), JEP-318: Epsilon GC

Aleksey Shipilev shade at redhat.com
Mon May 21 13:07:14 UTC 2018


Hi,

This is third (and hopefully final) round of code review for Epsilon GC changes.

JEP, targeted to 11:
  http://openjdk.java.net/jeps/318
  (you can find links to binary builds and sandbox locations there)

Webrev:
  http://cr.openjdk.java.net/~shade/epsilon/webrev.07/

Notes:
  *) C2 barrier modularization had landed, and now Epsilon has no platform-specific impact (this
alone makes me impressed and happy);
  *) Elastic TLAB machinery is now able to decay TLAB sizes as well, cutting down memory footprint
on bursty allocations, more tests for it added, gating by VM options implemented;
  *) Serviceability support implemented, verified with ad-hoc hsdb session ("universe" and
"scanoops" work as expected), and serviceability/sa tests;
  *) Tests are properly keyed with vm.gc.Epsilon, so they are ignored if Epsilon is not built

Builds:
    server X {x86_64, x86_32, aarch64, arm32, ppc64le, s390x}
      zero X {x86_64}
   minimal X {x86}

Testing: gc/epsilon on x86_64

Thanks,
-Aleksey

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