> See the bug for more discussion and reproducer. This PR replaces the ad-hoc > linked list 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 incrementally with one additional commit since the last revision: Avoid NPE on empty list, add tests, touchups ------------- Changes: - all: https://git.openjdk.org/jdk/pull/22043/files - new: https://git.openjdk.org/jdk/pull/22043/files/cf3a93b8..c511c9bb Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=22043&range=06 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22043&range=05-06 Stats: 251 lines in 5 files changed: 241 ins; 0 del; 10 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
