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Re: Custom loader for STAP

From: Arkady <arkady dot miasnikov at gmail dot com>
To: "Frank Ch. Eigler" <fche at redhat dot com>
Cc: systemtap at sourceware dot org
Date: Thu, 25 May 2017 09:00:46 +0300
Subject: Re: Custom loader for STAP
Authentication-results: sourceware.org; auth=none
References: <CANA-60qLa-F2SxC65wCpvPvHM6QQEO8BTf0cNzdmQ03tKLRmvg@mail.gmail.com> <87o9uif9ki.fsf@redhat.com>

Works! Thanks!

Mount point exists, but debugfs is not mounted. This is a 100th time I
forget that debugfs is not necessary mounted after boot. Strace log
clearly shows call to mount(), but I missed this tip as well.
Oh, well. May be next time I will remember.

On Wed, May 24, 2017 at 8:28 PM, Frank Ch. Eigler <fche@redhat.com> wrote:
> Arkady <arkady.miasnikov@gmail.com> writes:
>
>> [...]
>> 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. [...]
>
> Maybe you're just missing the mount ... DEBUGFS or RELAYFS part from
> staprun/staprun_funcs.c: mountfs() ?
>
> - FChE

References:
- Custom loader for STAP
  - From: Arkady
- Re: Custom loader for STAP
  - From: Frank Ch. Eigler

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