> 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.
Ioi Lam has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision: - Merge branch 'master' of https://github.com/openjdk/jdk into 8282828-uncompressed-oop-cds-archive-not-determinisic - 8282828: CDS uncompressed oops archive is not deterministic ------------- Changes: - all: https://git.openjdk.java.net/jdk/pull/8478/files - new: https://git.openjdk.java.net/jdk/pull/8478/files/f0261c51..8ddea12f Webrevs: - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8478&range=01 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8478&range=00-01 Stats: 15990 lines in 519 files changed: 10708 ins; 2732 del; 2550 mod Patch: https://git.openjdk.java.net/jdk/pull/8478.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/8478/head:pull/8478 PR: https://git.openjdk.java.net/jdk/pull/8478
