1. TPTP 4.4 New Java Profiler (JVMTI) Test and Performance Tools Platform (TPTP) TPTP 4.4 Thread Profiler Pause/Resume and Attach/Detach Design Asaf Yaffe Software and Solutions Group Intel Corporation

2. TPTP 4.4 New Java Profiler (JVMTI) Test and Performance Tools Platform (TPTP) Agenda Requirements Martini Runtime Enhancements Thread Profiler Design Changes

3. TPTP 4.4 New Java Profiler (JVMTI) Test and Performance Tools Platform (TPTP) Requirements Support pause/resume and attach/detach commands available in the Profiling Monitor view of the Eclipse Client Attach Create a new profiling session Update all views to reflect up-to-date thread information Thread start time is the attach time Current state, current stack, wait information (for waiting threads), etc… Detach Terminate the profiling session Do not terminate the profiled application Pause/resume During pause – profiler does not transmit data to the client On Resume – all views are updated to reflect up-to-date thread information

4. TPTP 4.4 New Java Profiler (JVMTI) Test and Performance Tools Platform (TPTP) Martini Runtime Enhancements New data items in GetThreadInfo DR_THREAD_STATE: Returns one of the following thread states: Unstarted, Running, Sleeping, Blocked (on monitor lock), Waiting (Object.wait), Terminated DR_CURRENT_MONITOR: Returns the id of the object (if any) whose monitor the thread is waiting for New API – GetAllThreadsInfo Similar to GetThreadInfo, but returns the information for all live threads instead of a specific thread Supports the following data items for each thread: Thread id Thread name (optional) Thread group (optional) Thread parent group (optional) Current stack trace (optional) Thread state (optional)

5. TPTP 4.4 New Java Profiler (JVMTI) Test and Performance Tools Platform (TPTP) Thread Profiler Design Changes

6. TPTP 4.4 New Java Profiler (JVMTI) Test and Performance Tools Platform (TPTP) Thread Profiler Initialization (MPICL_Instantiate) Register for all the necessary events (thread start, thread end, all monitor events) If started in enabled (detached) mode Disable the EG_MONITOR event group Ignore all incoming THREAD_START and THREAD_END events until an attach command is received

7. TPTP 4.4 New Java Profiler (JVMTI) Test and Performance Tools Platform (TPTP) Processing the attach Command Call GetAllThreadsInfo to obtain a list of all living threads For each thread in state other than Unstarted: Write a element to the data channel Do the following based on the threads state: Enable the EG_MONITOR event group and resume the processing of THREAD_START and THREAD_END events StateAction RunningNo additional action is needed SleepingWrite element to data channel BlockedWrite element to data channel WaitingWrite element to data channel

8. TPTP 4.4 New Java Profiler (JVMTI) Test and Performance Tools Platform (TPTP) Processing the detach Command Disable the EG_MONITOR event group Ignore all incoming THREAD_START and THREAD_END events until an attach command is received

9. TPTP 4.4 New Java Profiler (JVMTI) Test and Performance Tools Platform (TPTP) Processing the pause and resume Commands When pause command is received Stop writing data to the data channel Keep processing events, and remember the last event received for each thread When resume command is received Write the element corresponding to the last event received for each thread. Update the timestamp of the event to the time of the resume Resume writing to the data channel