> A jdk.VirtualPinnedEvent JFR event is recorded by Object::wait when a virtual > thread waits in Object.wait while pinned. The posting of the event in > ObjectMonitor::wait is done after waiting but it can block again in > enter/ReenterI before it re-acquires. If that happens then the event duration > won't be accurate, and for the off-list case, the enter may be contended and > a jdk.VirtualPinnedEvent event will be recorded for contended monitor enter. > The changes to fix this are small: move the post of the event for Object.wait > to end of the wait function, and only post an event for contended monitor > enter when not waiting. > > I've added a test to check the pinned event that is recored for several > contended monitor enter and Object.wait cases. It checks the event duration > and that only one event is recorded for each case.
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 seven additional commits since the last revision: - Merge branch 'master' into JDK-8346120 - Fix test comments - testObjectWait2 test already owns lock - Min duration check needs to have some tolerance - Rename test, check more event fields - Filter out VirtualThread.getAndClearInterrupt - Initial commit ------------- Changes: - all: https://git.openjdk.org/jdk/pull/22718/files - new: https://git.openjdk.org/jdk/pull/22718/files/47643726..51ef032d Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=22718&range=02 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22718&range=01-02 Stats: 2244 lines in 113 files changed: 1604 ins; 345 del; 295 mod Patch: https://git.openjdk.org/jdk/pull/22718.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/22718/head:pull/22718 PR: https://git.openjdk.org/jdk/pull/22718
