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Backward compatibility for insn probe point
- From: Maynard Johnson <maynardj at us dot ibm dot com>
- To: systemtap at sourceware dot org
- Cc: "Frank Ch. Eigler" <fche at redhat dot com>
- Date: Wed, 01 Apr 2009 16:59:59 -0500
- Subject: 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