I've read a few articles about Sun's new powertool called DTrace, and I must admit that I'm eager to get my hands on a Solaris10 to test this out. Some Linux developers have the same desire to see this implemented on Linux. Karim Yaghmour claims that DProbes and LTT gives you anything DTrace has, but RedHat developer Daniel Berrange has posted a comparison of DTrace and DProbes/LTT which gives DTrace the advantage.