Dynamic tracing of the X server

• Dtrace scripts written in “D” language

• Basic syntax similar to awk:

  • what to match { what to do when it matches }

• X probes start with “Xserverpid:”

  • pid is process id of X server to trace or * for all

• Simple example:

  • dtrace -n 'Xserver*:::client-connect { printf("client %d", arg0); }'
  • Prints client id every time a new client connects

Notes: