no access to local variables in function

["Lentes, Bernd" <bernd dot lentes at helmholtz-muenchen dot de>]

Hi,

i'm new to systemtap. I try to check some local variables of kernel functions. I have a SLES 10 SP4, kernel 2.6.16.60-0.103.1-smp. I'm using systemtap 0.8.
I'm following the instructions from https://sourceware.org/systemtap/SystemTap_Beginners_Guide/targetvariables.html .

If I try to use the example from this page I get:
idcc-devel:~/systemtap # stap -L 'kernel.function("vfs_read")'
kernel.function("vfs_read@fs/read_write.c:248")

Checking other functions with local variables also does not work:
idcc-devel:~/systemtap # stap -L 'kernel.function("local_bh_enable")'
kernel.function("local_bh_enable@kernel/softirq.c:139")

idcc-devel:~/systemtap # stap -L 'kernel.function("__tasklet_schedule")'
kernel.function("__tasklet_schedule@kernel/softirq.c:224")

idcc-devel:~/systemtap # stap -L 'kernel.function("tasklet_kill_immediate")'
kernel.function("tasklet_kill_immediate@kernel/softirq.c:439")

I don't see any local variable. What can I do ?

Btw: is there a chance to monitor the variables of a blacklisted function ?

Thanks.


Bernd

--
Bernd Lentes

Systemadministration
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