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From: Arkady <arkady.miasnikov@gmail.com>
To: systemtap@sourceware.org
Subject: Custom loader for STAP
Date: Wed, 24 May 2017 11:14:00 -0000	[thread overview]
Message-ID: <CANA-60qLa-F2SxC65wCpvPvHM6QQEO8BTf0cNzdmQ03tKLRmvg@mail.gmail.com> (raw)

Hi,

I am trying to insmod the STAP driver without the staprun. I have
figured out how to do that by writing to the .cmd file - Python script
is here https://github.com/larytet/YALAS/blob/master/generate_messages.py

The approach works fine with the modern (?) kernels. In the CentOS 6.9
folder /sys/kernel/debug/systemtap does not appear after I insmod the
module. Back to the strace and I see this in CentOS 6.9
https://github.com/larytet/YALAS/blob/master/strace.log#L314

I am looking in the staprun source code functions
init_staprun()->insert_stap_module()->insert_module()
I do not see anything special.

After I use staprun once I can insmod manually - the .cmd folder is
getting created. Next boot changes something in the debugfs and I have
to execute staprun again.

There is a "secret" ingredient, but I am missing it.

I will appreciate any tip.

Thanks

             reply	other threads:[~2017-05-24 11:14 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-24 11:14 Arkady [this message]
2017-05-24 17:28 ` Frank Ch. Eigler
2017-05-25  6:08   ` Arkady

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