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Backward compatibility for insn probe point


Frank has already made the changes in runtime/itrace.c to support backward compatibility with older utrace.  I wanted to test the insn probe point on an older utrace, so I built and installed systemtap 0.9.5 on a ppc970 blade running RHEL 5.3.  I ran the following simple test:

# stap -c /bin/ls simple-test.stp /bin/ls -o simple-out -k -vvv 
     where simple-test.stp is . . .
=========simple-test.stp ========================
global instrs = 0

probe begin {
	printf("systemtap starting probe\n")
}

probe process(@1).insn {
	instrs += 1
}

probe end { printf("systemtap ending probe\n")
printf("itraced = %d\n", instrs)
}
==================================

The result of the above test is that the stap command hangs at "stapio:start_cmd:195 execing target_cmd /bin/ls".  If I Ctl-C the job, it finished (i.e, I see "Pass 5: run completed ..."), but the output file contents indicate the insn probe was not hit (i.e., "itraced = 0").

Any suggestions on where to look for the problem?

Thanks.
-Maynard


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