On Mon, 27 Apr 2026 16:01:10 GMT, Robert Toyonaga <[email protected]> wrote:
> This PR guards usage of FileForce, SocketRead, and SocketWrite events with > `jfrTracing` to prevent those classes from being loaded when JFR is not in > use. This is the same technique as what's currently used with exception > events and FileRead/FileWrite events. > > I used NMT and a simple test app that exercises file force and socket IO > paths to check for a difference in memory usage. > **NMT Before:** > Classes=1188, Metadata used=966064 B, Class space used=93008 B > **NMT After:** > Classes=1182, Metadata used=943728 B, Class space used=89456 B > Note that the difference in amount used doesn't actually change amount > committed because the backing memory is pre-allocated in chunks with larger > granularity. > > Testing: > - new test test/jdk/jdk/jfr/event/io/TestEventsNotLoadedWithoutJfr.java to > check the guards work properly > - tier 1 > > --------- > - [x] I confirm that I make this contribution in accordance with the [OpenJDK > Interim AI Policy](https://openjdk.org/legal/ai). This pull request has now been integrated. Changeset: edc9c7f0 Author: Robert Toyonaga <[email protected]> URL: https://git.openjdk.org/jdk/commit/edc9c7f08cae100ac2521292b05de7e3713c5bf2 Stats: 282 lines in 10 files changed: 221 ins; 28 del; 33 mod 8331996: JFR: Add boolean check before loading event classes Reviewed-by: alanb, stuefe ------------- PR: https://git.openjdk.org/jdk/pull/30948
