> See the bug for more discussion and reproducer. This PR replaces the ad-hoc > linked list with segmented list of arrays. Arrays are easy targets for GC. > There are possible improvements here, most glaring is parallelism that is > currently knee-capped by global synchronization. The synchronization scheme > follows what we have in original code, and I think it is safer to continue > with it right now. > > I'll put performance data in a separate comment. > > Additional testing: > - [x] Original reproducer improves drastically > - [x] New microbenchmark shows no regression on "churning" tests, which > covers insertion/removal perf > - [x] New microbenchmark shows improvement on Full GC times (crude, but > repeatable), serves as a proxy for reproducer > - [x] `java/lang/ref` tests in release > - [x] `all` tests in fastdebug
Aleksey Shipilev 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 19 additional commits since the last revision: - Merge branch 'master' into JDK-8343704-cleaner-gc - Locals for head.size - Merge branch 'master' into JDK-8343704-cleaner-gc - Improve CleanerGC benchmark - Check all elements are removable after random test - Use RandomFactory in test - Touchups - Merge branch 'master' into JDK-8343704-cleaner-gc - Drop --add-exports from the test - prev is not needed - ... and 9 more: https://git.openjdk.org/jdk/compare/3ebe2206...39184f94 ------------- Changes: - all: https://git.openjdk.org/jdk/pull/22043/files - new: https://git.openjdk.org/jdk/pull/22043/files/a3cffd25..39184f94 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=22043&range=16 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22043&range=15-16 Stats: 114568 lines in 1582 files changed: 81503 ins; 25172 del; 7893 mod Patch: https://git.openjdk.org/jdk/pull/22043.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/22043/head:pull/22043 PR: https://git.openjdk.org/jdk/pull/22043
