> This change drops the adjustments to the virtual thread scheduler's target > parallelism when virtual threads do file operations on files that are opened > for buffered I/O. These operations are usually just too short to have any > benefit and may have a negative benefit when reading/writing a small number > of bytes. There is no change for read/write operations on files opened for > direct I/O or when writing to files that are opened with options for > synchronized I/O file integrity (O_SYNC/O_DSYNC and equivalents). Sergery > Kuksenko is polishing benchmarks that includes this area, this is for a > future PR. > > In addition, the blocker mechanism is updated to handle reentrancy (as can > happen if debugging code is added to ForkJoinPool) and preemption when > compensating (as can happen when substituting a heap buffer with a direct > buffer in some I/O operations). This part is a pre-requisite to the changes > to better support object monitor there are more places where preemption is > possible and this quickly leads to unbalanced begin/end. > > The changes have been baking in loom repo for some time.
Alan Bateman 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 five additional commits since the last revision: - Merge - Sync up from loom repo, update copyright headers - Merge - Merge - Initial commit ------------- Changes: - all: https://git.openjdk.org/jdk/pull/18598/files - new: https://git.openjdk.org/jdk/pull/18598/files/a21a8d6b..0d99fe0c Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=18598&range=01 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18598&range=00-01 Stats: 35845 lines in 976 files changed: 19000 ins; 10527 del; 6318 mod Patch: https://git.openjdk.org/jdk/pull/18598.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/18598/head:pull/18598 PR: https://git.openjdk.org/jdk/pull/18598
