By using the perfetto tracing SDK library in VirGL renderer, we can capture trace events, for example we can generate slices to represent when a VirGL command starts being decoded and finishes its handling. On the host side, Virgl renderer takes a submitted command buffer and decodes the commands by effectively performing a conversion from VirtIO GPU commands to OpenGL calls. Looking at a higher level, we can see many slice events that map directly to VirGL renderer functions, thereby giving us a bird's-eye view of its activity: polling for events, processing command batches batch, trasferring data, decoding and submitting commands.