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On Sat, May 21, 2011 at 08:27:59PM +0530, Manjusha Ajay wrote: > - Can 'pstack' or any such tracing/profiling commands be invoked within a > SystemTap session which collects the corresponding user space data when > the process hits a particular probe. For this specific case you are probably better off using the print_ubacktrace() function. > For example, I tried the following script to collect stack trace of a > particular process. > > probe process("process_name").syscall > { > pid = pid() > if (pid == target()) > { > if ($syscall == 11) > { > stop_cmd = sprintf("kill -s STOP %d", pid) > system(stop_cmd) // > Trying to stop the process to collect the required data when it receives > SIGSEGV > > cms = sprintf("pstack %d", pid()) > system(cmd) > } > cont_cmd = sprintf ("kill -s CONT %d", pid) > system(cont_cmd) > } > } > > Output: > Process 6343 not found // output of pstack > sh: line 0: kill: (6343) - No such process > sh: line 0: kill: (6343) - No such process > > Here bash commands executed through 'system' tapset are invoked after the > process is dead. > > My intent to get the userspace backtrace of any process which exits with a > segmentation fault. Is such a generic tracing method available in > systemtap? > Iam using Linux Red Hat release 5.4 and please comment on the backward > compatibility of the tool with Red Hat release 4.7. IIRC RHEL 4 doesn't have userland tracing. You can still put probes on system calls with "syscall.whatever" but I don't think you'll have ubacktrace(). I can't comment properly on DTrace as I have no experience with it but from my understanding it's functionnaly equivalent to SystemTap although the internals are significantly different.
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