The _NTO_TRACE_CONTROL class includes events related to the control of tracing itself.
| Event | traceprinter label | IDE label | Emitted when: |
|---|---|---|---|
| _NTO_TRACE_CONTROLBUFFER | BUFFER | Buffer | The instrumented kernel starts filling a new buffer |
| _NTO_TRACE_CONTROLTIME | TIME | Time | The 32 Least Significant Bits (LSB) part of the 64-bit clock rolls over, or the kernel emits an _NTO_TRACE_CONTROLBUFFER event |
The purpose of emitting _NTO_TRACE_CONTROLBUFFER events is to help tracelogger and the IDE track the buffers and determine if any buffers have been dropped. The instrumented kernel emits an _NTO_TRACE_CONTROLTIME event at the same time to keep the IDE in sync (in case a dropped buffer contained an _NTO_TRACE_CONTROLTIME event for a rollover of the clock).