> 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 incrementally with one additional commit since the last revision: prev is not needed ------------- Changes: - all: https://git.openjdk.org/jdk/pull/22043/files - new: https://git.openjdk.org/jdk/pull/22043/files/a7584bcc..30c0c7c5 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=22043&range=09 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22043&range=08-09 Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 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
