On Fri, 29 Apr 2022 22:50:45 GMT, Ioi Lam <ik...@openjdk.org> wrote: > During `java -Xshare:dump -XX:-UseCompressedOops`, the location of the Java > heap is chosen by the OS. Due to Address Space Layout Randomization, the heap > will always start at a different location. This causes the archive for > uncompressed oops ($JAVA_HOME/lib/server/classes_nocoops.jsa) to be > non-deterministic. > > The fix is to patch the archived object pointers to make it look like the > heap starts at a fixed address -- I chose 0x10000000, but the exact value > doesn't really matter. > > At runtime, the object pointers will be patched again according to the real > location of the heap. > > Tested with tiers 1-5. I am running builds-tier5 several times to test the > xxx-cmp-baseline builds.
This pull request has now been integrated. Changeset: 64b5b2b0 Author: Ioi Lam <ik...@openjdk.org> URL: https://git.openjdk.java.net/jdk/commit/64b5b2b0b3e5156d9b0c5f378ce3a1ae52aa0819 Stats: 86 lines in 6 files changed: 62 ins; 2 del; 22 mod 8282828: CDS uncompressed oops archive is not deterministic Reviewed-by: erikj, ihse, ccheung ------------- PR: https://git.openjdk.java.net/jdk/pull/8478
