public void Waking(Timestamp timestamp, ThreadInfo readyingThread)
{
this.stateTransition(timestamp, ThreadState.TASK_WAKING);
if (readyingThread != null)
{
this.readyingPid = readyingThread.PidAsString();
this.readyingTid = readyingThread.Tid.ToString();
}
}
void ProcessSyscallEventMetadata(LTTngEvent data)
{
int tid = data.StreamDefinedEventContext.ReadFieldAsInt32("_tid");
ThreadInfo callerThread;
if (!this.runningThreads.TryGetValue(tid, out callerThread))
{
callerThread = new ThreadInfo(tid, data.Timestamp, ThreadInfo.ThreadState.TASK_RUNNING);
this.AddNewThread(callerThread);
}
this.ProcessThreadMetadata(data, callerThread);
}
public void ProcessThreadCloneSyscallEntry(LTTngEvent data, LTTngContext context)
{
ThreadInfo threadInExecution = this.EventCreatorThread(data, context.CurrentCpu);
if (threadInExecution != null)
{
if (this.closingEventsToBeSkipped.TryGetValue(threadInExecution.Tid, out int eventsToBeSkipped) && eventsToBeSkipped > 0)
{
this.closingEventsToBeSkipped[threadInExecution.Tid] = eventsToBeSkipped + 1;
return;
}
uint? cloneFlags = null;
const string SysCallCloneFlags = "_clone_flags";
const string SysCallFlagsAsStruct = "_flags"; // https://lttng.org/docs/v2.13/#doc-whats-new & https://github.com/lttng/lttng-modules/commit/d775625e2ba4825b73b5897e7701ad6e2bdba115
if (data.Payload.FieldsByName.ContainsKey(SysCallCloneFlags))
{
cloneFlags = data.Payload.ReadFieldAsUInt32(SysCallCloneFlags);
}
else if (data.Payload.FieldsByName.ContainsKey(SysCallFlagsAsStruct)) // New since v2.13
{
var flags = data.Payload.ReadFieldAsUInt32(SysCallFlagsAsStruct);
// var exitSignal = flags & 0xFF; // the least significant byte of the `unsigned long` is the signal the kernel need to send to the parent process on child exit
cloneFlags = flags & 0xFFFFFF00; // the remaining bytes of the `unsigned long` is used a bitwise flag for the clone options.
}
if (cloneFlags.HasValue)
{
if (cloneSyscallFlagsPerTid.TryGetValue(threadInExecution.Tid, out Dictionary <uint, int> lastCalls))
{
if (lastCalls.TryGetValue(cloneFlags.Value, out int timesUsed))
{
lastCalls[cloneFlags.Value] = timesUsed + 1;
}
else
{
lastCalls[cloneFlags.Value] = 1;
}
}
else
{
cloneSyscallFlagsPerTid[threadInExecution.Tid] = new Dictionary <uint, int>()
{
[cloneFlags.Value] = 1
};
}
}
}
}
public void ProcessThreadWakeUp(LTTngEvent data, LTTngContext context)
{
int tid = data.Payload.ReadFieldAsInt32("_tid");
if (runningThreads.TryGetValue(tid, out ThreadInfo nextThread))
{
nextThread.Wakeup(data.Timestamp);
}
else
{
ThreadInfo readyingThread = this.EventCreatorThread(data, context.CurrentCpu);
this.AddNewThread(new ThreadInfo(tid, data.Timestamp, ThreadInfo.ThreadState.TASK_RUNNING, readyingThread));
}
}
private void ProcessGetPidSyscallExit(LTTngEvent data, LTTngContext context)
{
if (data.StreamDefinedEventContext == null ||
!data.StreamDefinedEventContext.FieldsByName.ContainsKey("_pid") ||
!data.StreamDefinedEventContext.FieldsByName.ContainsKey("_tid"))
{
///This heuristic is activated when the event context does not have metadata regarding to tid and pid
ThreadInfo executingThread = CurrentExecutingThread(context.CurrentCpu);
int pid = data.Payload.ReadFieldAsInt32("_ret");
if (executingThread != null && executingThread.Pid < 0)
{
this.RecoverPid(executingThread, pid);
}
}
}
public Thread(ThreadInfo threadInfo)
{
this.tid = threadInfo.Tid;
this.pidAsInt = threadInfo.Pid;
this.pidAsString = threadInfo.PidAsString();
this.command = threadInfo.Command;
this.startTime = threadInfo.StartTime;
this.exitTime = threadInfo.ExitTime;
this.execTime = threadInfo.ExecTimeNs;
this.readyTime = threadInfo.ReadyTimeNs;
this.sleepTime = threadInfo.SleepTimeNs;
this.diskSleepTime = threadInfo.DiskSleepTimeNs;
this.stoppedTime = threadInfo.StoppedTimeNs;
this.parkedTime = threadInfo.ParkedTimeNs;
this.idleTime = threadInfo.IdleTimeNs;
}
public void ProcessSchedForkEvent(LTTngEvent data, LTTngContext context)
{
int newTid = data.Payload.ReadFieldAsInt32("_child_tid");
if (runningThreads.TryGetValue(newTid, out ThreadInfo oldThreadWithSamePid))
{
this.terminatedThreads.Add(new Thread(oldThreadWithSamePid));
}
ThreadInfo parentThread = null;
int parentTid = data.Payload.ReadFieldAsInt32("_parent_tid");
if (runningThreads.ContainsKey(parentTid))
{
parentThread = runningThreads[parentTid];
if (parentThread.Pid < 0)
{
this.RecoverPid(parentThread, data.Payload.ReadFieldAsInt32("_parent_pid"));
}
}
this.AddNewThread(new ThreadInfo(newTid, data.Timestamp, ThreadInfo.ThreadState.TASK_NEW, parentThread));
}
public ContextSwitch(LTTngEvent data, ThreadInfo nextThread, ThreadInfo previousThread, uint cpu)
{
this.cpu = cpu;
this.nextPid = nextThread.PidAsString();
this.nextTid = nextThread.Tid;
this.previousPid = previousThread.PidAsString();
this.previousTid = previousThread.Tid;
this.priority = data.Payload.ReadFieldAsInt32("_next_prio");
if (nextThread.currentState == ThreadInfo.SchedulingState.Running)
{
this.readyingPid = nextThread.readyingPid;
this.readyingTid = nextThread.readyingTid;
this.readyTime = data.Timestamp - nextThread.lastEventTimestamp;
this.previousState = ThreadInfo.SchedulingStateToString(nextThread.previousState);
if (nextThread.previousState == ThreadInfo.SchedulingState.Running ||
nextThread.previousState == ThreadInfo.SchedulingState.NewlyCreated ||
nextThread.previousState == ThreadInfo.SchedulingState.Unknown)
{
this.waitTime = new TimestampDelta(0);
}
else
{
this.waitTime = nextThread.previousWaitTime;
}
}
else
{
this.readyingPid = string.Empty;
this.readyingTid = string.Empty;
this.readyTime = new TimestampDelta(0);
this.waitTime = data.Timestamp - nextThread.lastEventTimestamp;
this.previousState = ThreadInfo.SchedulingStateToString(nextThread.currentState);
}
this.nextCommand = data.Payload.ReadFieldAsArray("_next_comm").GetValueAsString();
this.previousCommand = data.Payload.ReadFieldAsArray("_prev_comm").GetValueAsString();
this.switchInTime = data.Timestamp;
this.nextThreadPreviousSwitchOutTime = nextThread.previousSwitchOutTime;
}
void ProcessThreadMetadata(LTTngEvent data, ThreadInfo thread)
{
if (data.StreamDefinedEventContext.FieldsByName.ContainsKey("_pid"))
{
int pid = data.StreamDefinedEventContext.ReadFieldAsInt32("_pid");
if (thread.Pid != pid)
{
this.RecoverPid(thread, pid);
}
}
if (thread.Command.Equals(String.Empty))
{
if (data.StreamDefinedEventContext.FieldsByName.ContainsKey("_procname"))
{
thread.Command = data.StreamDefinedEventContext.ReadFieldAsArray("_procname").ReadAsString();
}
else if (data.StreamDefinedEventContext.FieldsByName.ContainsKey("_name"))
{
thread.Command = data.StreamDefinedEventContext.ReadFieldAsArray("_name").ReadAsString();
}
}
}
public void ProcessThreadCloneSyscallExit(LTTngEvent data, LTTngContext context)
{
int newThreadTid = data.Payload.ReadFieldAsInt32("_ret");
if (newThreadTid == 0)
{
///This is the returning syscall for the newly created child
return;
}
ThreadInfo threadInExecution = this.EventCreatorThread(data, context.CurrentCpu);
if (threadInExecution != null)
{
if (this.closingEventsToBeSkipped.TryGetValue(threadInExecution.Tid, out int eventsToBeSkipped) && eventsToBeSkipped > 0)
{
if (eventsToBeSkipped == 1)
{
this.closingEventsToBeSkipped.Remove(threadInExecution.Tid);
}
else
{
this.closingEventsToBeSkipped[threadInExecution.Tid] = eventsToBeSkipped - 1;
}
}
else if (cloneSyscallFlagsPerTid.TryGetValue(threadInExecution.Tid, out Dictionary <uint, int> lastCalls))
{
if (lastCalls.Count == 1)
{
uint flag = new List <uint>(lastCalls.Keys)[0];
if (newThreadTid > 0 && (flag & 0x00010000) > 0 && runningThreads.TryGetValue(threadInExecution.Tid, out ThreadInfo parentThread))
{
if (runningThreads.TryGetValue(newThreadTid, out ThreadInfo newThread))
{
newThread.Pid = parentThread.Pid;
}
else
{
this.AddNewThread(new ThreadInfo(newThreadTid, data.Timestamp, ThreadInfo.ThreadState.TASK_NEW, threadInExecution, true));
}
}
int amountOfEntries = lastCalls[flag];
if (amountOfEntries <= 1)
{
lastCalls.Remove(flag);
}
else
{
lastCalls[flag] = amountOfEntries - 1;
}
}
else if (lastCalls.Count > 1)
{
int pendingEntryEvents = 0;
foreach (var entry in lastCalls)
{
pendingEntryEvents += entry.Value;
}
closingEventsToBeSkipped[threadInExecution.Tid] = pendingEntryEvents - 1; ///Decrease one for the current closing event
lastCalls.Clear();
}
}
}
}
public void ProcessContextSwitch(LTTngEvent data, LTTngContext context)
{
int prevTid = data.Payload.ReadFieldAsInt32("_prev_tid");
if (lastContextSwitch.TryGetValue(context.CurrentCpu, out ContextSwitch previousContextSwitch))
{
if (prevTid == previousContextSwitch.NextTid)
{
processedExecutionEvents.Add(new ExecutionEvent(previousContextSwitch, data.Timestamp));
}
else
{
///If we missed context switch events,
processedExecutionEvents.Add(new ExecutionEvent(previousContextSwitch, previousContextSwitch.SwitchInTime));
}
}
int nextTid = data.Payload.ReadFieldAsInt32("_next_tid");
ThreadInfo.ThreadState switchOutState;
var prevStateValue = data.Payload.FieldsByName["_prev_state"];
if (prevStateValue.FieldType == CtfTypes.Enum)
{
((CtfEnumValue)prevStateValue).IntegerValue.TryGetInt32(out int enumValue);
switchOutState = (ThreadInfo.ThreadState)enumValue;
}
else
{
switchOutState = (ThreadInfo.ThreadState)data.Payload.ReadFieldAsInt32("_prev_state");
}
ThreadInfo prevThread;
if (runningThreads.TryGetValue(prevTid, out prevThread))
{
prevThread.SwitchOut(data, switchOutState);
}
else
{
prevThread = new ThreadInfo(prevTid, data.Timestamp, switchOutState);
this.AddNewThread(prevThread);
}
if (this.EventHasMetadata(data))
{
this.ProcessThreadMetadata(data, prevThread);
}
ThreadInfo nextThread;
if (runningThreads.TryGetValue(nextTid, out nextThread))
{
lastContextSwitch[context.CurrentCpu] = new ContextSwitch(data, nextThread, prevThread, context.CurrentCpu);
nextThread.SwitchIn(data.Timestamp);
}
else
{
nextThread = new ThreadInfo(nextTid, data.Timestamp, ThreadInfo.ThreadState.TASK_RUNNING);
lastContextSwitch[context.CurrentCpu] = new ContextSwitch(data, nextThread, prevThread, context.CurrentCpu);
this.AddNewThread(nextThread);
}
}
private void RecoverPid(ThreadInfo thread, int newPid)
{
this.recoveredPids[thread.Pid] = newPid;
thread.Pid = newPid;
}
private void AddNewThread(ThreadInfo newThread)
{
this.runningThreads[newThread.Tid] = newThread;
}
public ThreadInfo(int tid, Timestamp firstEventTime, ThreadState startingState, ThreadInfo parentThread = null, bool inheritPid = false)
{
this.Tid = tid;
if (startingState == ThreadState.TASK_NEW)
{
this.previousState = SchedulingState.NewlyCreated;
if (inheritPid && parentThread != null)
{
this.Pid = parentThread.Pid;
}
else
{
this.Pid = tid;
}
if (parentThread != null)
{
if (inheritPid)
{
this.Pid = parentThread.Pid;
}
else
{
this.Pid = tid;
}
this.Command = parentThread.Command;
}
else
{
this.Command = String.Empty;
this.Pid = tid;
}
this.StartTime = firstEventTime;
}
else
{
this.Pid = tid * (-1);
this.previousState = SchedulingState.Unknown;
this.Command = String.Empty;
this.StartTime = Timestamp.Zero;
}
this.lastEventTimestamp = firstEventTime;
this.currentState = ThreadStateToSchedulingState(startingState);
if (startingState == ThreadState.TASK_WAKING && parentThread != null)
{
this.readyingPid = parentThread.PidAsString();
this.readyingTid = parentThread.Tid.ToString();
}
else
{
this.readyingPid = String.Empty;
this.readyingTid = String.Empty;
}
}
