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Function probe return
- From: philippe <philippe dot midol-monnet at sopragroup dot com>
- To: systemtap at sourceware dot org
- Date: Wed, 11 Sep 2013 08:00:31 -0700 (PDT)
- Subject: Function probe return
- Authentication-results: sourceware.org; auth=none
Hi
I'm trying to run this script:
probe process("/opt/xxx/bin/swim").function("CREATE_LOGBOOK").call{
time_call[probefunc()] = gettimeofday_us()
printf("%-s call: %-d\n", probefunc(), time_call[probefunc()])
}
probe process("/opt/xxx/bin/swim").function("CREATE_LOGBOOK").return{
time = gettimeofday_us() - time_call[probefunc()]
printf("%-s: %-d us\n", probefunc(), time)
}
stap fails with the following error:
root@p4080ds:/tmp# stap -v timestamp_logbook_calls.stp
Pass 1: parsed user script and 90 library script(s) using
20688virt/14028res/1560shr/13196data kb, in 440usr/0sys/437real ms.
semantic error: while resolving probe point: identifier 'process' at
timestamp_logbook_calls.stp:25:7
source: probe
process("/opt/xxx/bin/swim").function("CREATE_LOGBOOK").return{
^
semantic error: process return probes not available [man
error::inode-uprobes]
Pass 2: analyzed script: 8 probe(s), 147 function(s), 4 embed(s), 2
global(s) using 121640virt/16584res/2968shr/14212data kb, in
40usr/150sys/200real ms.
Pass 2: analysis failed. [man error::pass2]
If the probe process("/opt/xxx/bin/swim").function("CREATE_LOGBOOK").return
is commented, it works fine.
Why does the "call" work and not the "return"?
stap version 2.1/0.148
system: Linux 3.8.13-rt9 (powerpc)
Philippe
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