* tracing module init functions
@ 2008-05-09 19:54 Paul Larson
2008-05-09 19:59 ` Frank Ch. Eigler
0 siblings, 1 reply; 2+ messages in thread
From: Paul Larson @ 2008-05-09 19:54 UTC (permalink / raw)
To: systemtap
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Is there a way to trace module init functions, and other functions such
as device probes that happen early when a module comes up? I've tried
running with things like "stap -c modprobe somemod" and also tried
adding a system("modprobe somemod") to the begin probe in my script, but
to no avail.
Thanks,
Paul Larson
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: tracing module init functions
2008-05-09 19:54 tracing module init functions Paul Larson
@ 2008-05-09 19:59 ` Frank Ch. Eigler
0 siblings, 0 replies; 2+ messages in thread
From: Frank Ch. Eigler @ 2008-05-09 19:59 UTC (permalink / raw)
To: Paul Larson; +Cc: systemtap
Paul Larson <pl@us.ibm.com> writes:
> Is there a way to trace module init functions, and other functions such
> as device probes that happen early when a module comes up? [...]
Not yet. The main reason is that init type functions get unmapped
pretty soon after module loading, so systemtap refuses to put kprobes
into such areas (e.g., bug #1329, #5483). If we were really clever,
we could intercept the module loading process, wrap the init function,
and temporarily insert and remove the kprobes for only the real init
call's duration.
- FChE
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