RFR: Epsilon GC

Aleksey Shipilev shade at redhat.com
Thu Apr 26 17:37:54 UTC 2018


This is the review thread for Epsilon GC changes.

JEP, targeted to 11:
  (you can find links to binary builds and sandbox locations there)



  *) See how the whole things is _almost_ drop-in to hotspot/share/gc, without having arch-specific
mess -- thanks to GC interface work done over last years;

  *) There are some leftovers due to GC barriers work in progress: templateTable_arm.cpp addition
goes away after JDK-8201786 [1], c1_LIRGenerator.cpp change should go away after C1 barriers
modularization is complete, graphKit.cpp change should go away after C2 barriers modularization is

  *) Half of the webrev are Epsilon-specific tests. They take ~30s in release and ~60s in fastdebug
on my desktop. They are not in tier1, so smoke testing time is not affected;

  *) UseEpsilonGC is experimental. This should be fine after conditional GC compilation [2], so
vendors who are unwilling to extend whatever small notion [3] of support comes with experimental VM
option, may choose not to build it.

Testing: all platform builds, gc/epsilon on x86_64


[1] https://bugs.openjdk.java.net/browse/JDK-8201786
[2] https://bugs.openjdk.java.net/browse/JDK-8200729
[3] http://hg.openjdk.java.net/jdk/jdk/file/3661f31c6df4/src/hotspot/share/runtime/globals.hpp#l150

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: OpenPGP digital signature
URL: <https://mail.openjdk.java.net/pipermail/hotspot-gc-dev/attachments/20180426/fc0c9c6b/signature.asc>

More information about the hotspot-gc-dev mailing list