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Probing symbols that are not EXPORT()ed
- From: Alan David Brunelle <Alan dot Brunelle at hp dot com>
- To: systemtap at sourceware dot org
- Date: Thu, 08 Jun 2006 13:15:45 -0400
- Subject: Probing symbols that are not EXPORT()ed
[Sorry for this newbie question...]
How does one probe on a kernel function that does not have an
EXPORT_SYMBOL()
invocation?
For example the following fails:
global rqs
probe kernel.function("scsi_dispatch_cmd")
{
rqs <<< $cmd->request_bufflen
}
probe end
{
print(@hist_linear(rqs, 0, 512000, 4000))
exit()
}
with:
[root@bl25p1 06_08]# stap -v scwrite.stp
Pass 1: parsed user script and 11 library script(s) in 40usr/0sys/51real ms.
semantic error: no match for probe point
while: resolving probe point kernel.function("scsi_dispatch_cmd")
Pass 2: analyzed script: 1 probe(s), 4 function(s), 1 global(s) in
150usr/20sys/163real ms.
Pass 2: analysis failed.
Thanks,
Alan