Hi Xiang, On Tue, 2009-04-07 at 11:06 +0800, Fang, Xiang wrote: > My question is: > 1. Does any one get the user space call stack with SystemTap successfully? User space backtraces is work in progress. See http://sourceware.org/bugzilla/show_bug.cgi?id=5635 Cheers, Mark