Start of a kernel iteration.
End of a kernel iteration.
Start of a stream stall, i.e., the start of a read from a stream port of a kernel that blocks because of lack of data.
End of a stream stall, i.e., the point where a read from a stream port that initially blocked, finally returns.
Start of a lock stall, i.e., the start of an attempt to acquire a window port where the lock is initially not available.
End of a lock stall, i.e., the point in time where an attempt to acquire a window port that initially blocked, finally returns.