> The main objectives for this PR are: > 1) Compact Object Headers needs the Object Monitor Table to work. > 2) Both Compact Object Headers > ([JDK-8360700](https://bugs.openjdk.org/browse/JDK-8360700)) and Object > Monitor Table ([JDK-8379782](https://bugs.openjdk.org/browse/JDK-8379782)) > are now enabled by default. > 3) If we always use the Object Monitor Table, we will free up lots of bits > in the markword, that could be of use to others (read GC). > 4) If we don't need to maintain any "monitor pointer in the mark word" code, > we will simplify the code base. > > Therefore this PR will remove the `UseObjectMonitorTable` flag and related > code. > > Note that this PR only removes the most obvious use of the > `UseObjectMonitorTable` in the code base. This is to ease the burden on the > reviewers. [JDK-8389938](https://bugs.openjdk.org/browse/JDK-8389938) has > been created to finalize the work by removing the less obvious code, like no > longer used mark word code in different GCs. > > The code has passed tier1-7 testing on supported platforms and smoke testing > using QEMU on `RISC-V`, `PowerPC` and `s390`. > > --------- > - [x] I confirm that I make this contribution in accordance with the [OpenJDK > Interim AI Policy](https://openjdk.org/legal/ai).
Fredrik Bredberg 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 three additional commits since the last revision: - Updated after review - Merge branch 'master' into 8389325_remove_use_object_monitor_table_flag - 8389325: Remove the UseObjectMonitorTable flag and related code ------------- Changes: - all: https://git.openjdk.org/jdk/pull/32257/files - new: https://git.openjdk.org/jdk/pull/32257/files/81ab57f7..8fef9656 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=32257&range=01 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=32257&range=00-01 Stats: 13640 lines in 380 files changed: 9005 ins; 3250 del; 1385 mod Patch: https://git.openjdk.org/jdk/pull/32257.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/32257/head:pull/32257 PR: https://git.openjdk.org/jdk/pull/32257
