X ????????? DTrace ?????????

??? Developer 2/07 ??????????????????X ?????????????????????????????????????????????????????? (User-land Statically Defined Tracing, USDT) DTrace ????????????????????? X11 ??????????????????X ??????????????????????????????

• Xorg

• Xsun

• Xprt

• Xnest

• Xvfb

????????????????????????????????????????????????????????????????????? dtrace ???????????????????????? http://people.freedesktop.org/???