Bug ID: JDK-8319551 Regressions >10% in some JFR Startups

JDK-8319551 : Regressions >10% in some JFR Startups

Type: Bug
Component: hotspot
Sub-Component: jfr
Affected Version: 22

Priority: P2
Status: Closed
Resolution: Fixed

Submitted: 2023-11-06
Updated: 2024-06-04
Resolved: 2024-06-04

Versions (Unresolved/Resolved/Fixed)

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JDK 23
23Fixed

Related Reports

Duplicate :	JDK-8321581 - JFR: Remove remaining use of instrumentation for I/O events
Relates :	JDK-8318124 - JFR: Rewrite instrumentation to use Class-File API

Sub Tasks

JDK-8322567 :	Release Note: JFR: Increased Startup Time when Using `-XX:StartFlightRecording` - Resolved
JDK-8331876 :	JFR: Move file read and write events to java.base - Resolved
JDK-8331877 :	JFR: Remove JIInliner framework - Resolved

Description

Appeared in 22-b21, seems to be related to JDK-8318124

Comments

Moving to JDK 23. Fixing this would require removing instrumentation for I/O events, which is larger change (enhancement).

07-12-2023

It's the new Class-File API. JFR now loads about 300-400 additional classes. Some of it we will win back once we remove ASM, now we use both. Plan is to not use instrumentation for I/O events.

07-11-2023

What kind of foot-print are we talking about here? The use of the Classfile API will require loading numerous classes.

07-11-2023