[11u] [JFR] RFR(XXL) 8226511: Implement JFR Event Streaming

[Erik Gahlin]

Hi,

JDK 14 has been out for one day and few have used it in production. The 
feature changes core aspects of the JFR implementation, such as the 
tagging mechanism and the parser. Event streaming is not something that 
can be turned on by an API call or a command line flag, it is always 
there. If there are bugs, it will likely impact ordinary use of JFR as well.

Erik

> Hi team,
>
> JDK 14 is now Generally Available, as one of the features, JFR Event Streaming is very attractive for us.
>
> With JFR Event Streaming, we can more easily implement the continuous monitoring of Java application based on JFR in the container environment.
>
> So I would like to backport JDK-8226511(Implement JFR Event Streaming) to 11u, please help us to review the patch.
>
> Previously, we had a discussion at https://mail.openjdk.java.net/pipermail/jdk-updates-dev/2019-November/002169.html, there are many companies interested in this
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8226511
> Webrev: http://cr.openjdk.java.net/~ddong/11u-8226511/webrev.00
> Test (release/slow-debug on Linux): All JFR Event Streaming passed, and other JFR tests have the same result with the build without this patch
>
> The original patch is large, and cannot be applied to 11u directly
> All files that cannot be derectly applied are as follows:
>      src/hotspot/share/gc/g1/g1Trace.cpp (dosn't exist in 11u)
>      src/hotspot/share/gc/shenandoah/shenandoahJfrSupport.cpp (dosn't exist in 11u)
>      test/jdk/jdk/jfr/event/metadata/TestLookForUntestedEvents.java (dosn't exist in 11u, introduced in JDK-8213914)
>      src/jdk.jfr/share/classes/jdk/jfr/internal/SecuritySupport.java
>      src/jdk.jfr/share/classes/jdk/jfr/internal/Repository.java
>      src/jdk.jfr/share/conf/jfr/profile.jfc
>      src/jdk.jfr/share/conf/jfr/default.jfc
>      src/hotspot/share/jfr/periodic/jfrPeriodic.cpp
>      src/hotspot/share/jfr/recorder/repository/jfrChunkState.hpp
>      src/hotspot/share/jfr/recorder/repository/jfrEmergencyDump.cpp
>      src/hotspot/share/jfr/recorder/repository/jfrRepository.cpp
>      src/hotspot/share/jfr/recorder/service/jfrRecorderService.cpp
>      src/hotspot/share/jfr/recorder/service/jfrPostBox.cpp
>      src/hotspot/share/jfr/recorder/checkpoint/jfrCheckpointManager.cpp (ClassLoaderDataGraph_lock doesn't exist in 11u)
>      src/hotspot/share/jfr/recorder/checkpoint/types/jfrThreadState.hpp
>      src/hotspot/share/jfr/recorder/stacktrace/jfrStackTraceRepository.cpp
>      src/hotspot/share/jfr/recorder/storage/jfrVirtualMemory.cpp
>      src/hotspot/share/jfr/utilities/jfrTypes.hpp
>      src/hotspot/share/jfr/support/jfrThreadLocal.cpp
>      src/hotspot/share/jfr/metadata/metadata.xml
>      src/hotspot/share/runtime/mutexLocker.cpp
>    test/jdk/ProblemList.txt
>
> Also, we want to backport some other related issues to 11u:
>      JDK-8233700: EventStream not closed
>      JDK-8229209: test for cross-process JFR event streaming
>      JDK-8234703: [TESTBUG] JFR TestOutOfProcessMigration.java should clean up files
>      JDK-8234684: JFR crashes when rotating the JFR output during assertion failure
>      JDK-8233870: JFR TestSetEndTime.java times out - onClose() is never called
>      JDK-8234888: EventStream::close doesn't abort streaming thread
>      JDK-8234671: JFR api/consumer/recordingstream/TestStart.java failed due to timeout at testStartTwice()
>      JDK-8235356: [TESTBUG] Disable 'producer is alive' check in JFR TestCrossProcessStreaming
>      JDK-8233111: Epoch shift synchronization point for Compiler threads
>      JDK-8234059: Stress test fails with "Unexpected Exception in thread JFR Event Stream"
>      JDK-8236264: Remove jdk.jfr.Recording::setFlushInterval and jdk.jfr.Recording::getFlushInterval
>      JDK-8236263: Remove experimental streaming events
> Most of them can directly apply to 11u, except 8233111, 8234059 and 8236263
>
> Cheers,
> Denghui Dong