On Fri, 29 Sep 2023 02:20:10 GMT, Alex Menkov <amen...@openjdk.org> wrote:
>> This is subtask of JDK-8299426: Heap dump does not contain virtual Thread >> stack references >> The change: >> - reorganize thread-related code/prepare it to use for unmounted vthreads: >> - new ThreadDumper class caches stack frames, thread serial num, frame >> serial number (trace serial number is calculated from thread serial); >> ThreadDumper objects for all platform/carrier and mounted virtual >> threads are cached instead of ThreadStackTrace objects (they are created >> during HPROF_FRAME/HPROF_TRACE dumping, used lated for writing >> HPROF_GC_ROOT_THREAD_OBJ/HPROF_GC_ROOT_JAVA_FRAME/HPROF_GC_ROOT_JNI_LOCAL >> subrecords); >> - new helper class JavaStackRefDumper to dump references from threadf >> stack; >> - separate track traces for mounted virtual threads: >> - separate HPROF_FRAME/HPROF_TRACE records for mounted vthreads and >> carrier threads; >> - separate >> HPROF_GC_ROOT_THREAD_OBJ/HPROF_GC_ROOT_JAVA_FRAME/HPROF_GC_ROOT_JNI_LOCAL >> subrecords; >> - updated hprof parser test lib to collect data about threads >> (HPROF_GC_ROOT_THREAD_OBJ subrecords) and corresponding stack traces and >> stack references. >> >> Testing - tier1-tier3, new test >> >> Output of the test for VtreadInHeapDumpTarg$VthreadMounted thread >> without the fix: >> `thread 0x8101be90, 16 frames >> - [0] VtreadInHeapDumpTarg$VthreadMounted.run()V >> (VtreadInHeapDump.java:127) >> Java Local Reference: VtreadInHeapDumpTarg$VthreadMounted >> Java Local Reference: VtreadInHeapDumpTarg$VThreadMountedReferenced >> - [1] java.lang.Thread.runWith(Ljava/lang/Object;Ljava/lang/Runnable;)V >> (Thread.java:1583) >> Java Local Reference: java.lang.VirtualThread >> Java Local Reference: java.lang.Class >> Java Local Reference: VtreadInHeapDumpTarg$VthreadMounted >> - [2] java.lang.VirtualThread.run(Ljava/lang/Runnable;)V >> (VirtualThread.java:309) >> Java Local Reference: java.lang.VirtualThread >> Java Local Reference: VtreadInHeapDumpTarg$VthreadMounted >> Java Local Reference: java.lang.Class >> - [3] java.lang.VirtualThread$VThreadContinuation$1.run()V >> (VirtualThread.java:190) >> Java Local Reference: java.lang.VirtualThread$VThreadContinuation$1 >> - [4] jdk.internal.vm.Continuation.enter0()V (Continuation.java:320) >> Java Local Reference: java.lang.VirtualThread$VThreadContinuation >> - [5] jdk.internal.vm.Continuation.enter(Ljdk/internal/vm/Continuation;Z)V >> (Continuation.java:312) >> Java Local Reference: java.lang.VirtualThread$VThreadContinuation >> - [6] jd... > > Alex Menkov has updated the pull request incrementally with one additional > commit since the last revision: > > misspell getRefererId for consistency I wonder why the `enterSpecial` frame is not present in mounted virtual thread stack trace case with the fix: `[6] jdk.internal.vm.Continuation.enterSpecial(Ljdk/internal/vm/Continuation;ZZ)V (Continuation.java:(native method))` ------------- PR Comment: https://git.openjdk.org/jdk/pull/15869#issuecomment-1745871636
