On Fri, 11 Nov 2022 14:35:22 GMT, Roman Kennke <rken...@openjdk.org> wrote:
>>> So the data structure for lock records (per thread) could consist of a >>> series of distinct values [ A B C ] and each of the values could be >>> repeated, but only adjacently: [ A A A B C C ] for example. >> @rose00 why only adjacently? Nested locking can be interleaved on different >> monitors. > > @dholmes-ora and all: I have prepared an alternative PR #10907 that > implements the fast-locking behind a new experimental flag, and preserves the > current stack-locking behavior as the default setting. It is currently > implemented and tested on x86* and aarch64 arches. It is also less invasive > because it keeps everything structurally the same (i.e. no method signature > changes, no stack layout changes, etc). On the downside, it also means we can > not have any of the associated cleanups and optimizations yet, but those are > minor anyway. Also, there still is the risk that I make a mistake with the > necessary factoring-out of current implementation. If we agree that this > should be the way to go, then I would close this PR, and continue work on > #10907. @rkennke not unexpectedly I greatly prefer the optional and opt-in version in PR https://github.com/openjdk/jdk/pull/10907. ------------- PR: https://git.openjdk.org/jdk/pull/10590
