Re: systemtap with USB

[tsjaseen <jaseen dot shamsuddin at wipro dot com>]

Hi,

This time i tried with linux-2.6.24 kernel and systemtap (version
0.6.2/0.130). Still not working.
With -t option only one hit is seen i.e.
probe timer.ms(5000) (usb-reg.stp:7:1), hits: 1, cycles:
1780min/1780avg/1780max ......

When i tried with 
probe module("usb-storage").function(....)
It gave me the following error:
semantic error: no match while resolving probe point
module("usb-storage").function("usb_register_driver")

Regards,
Jaseen


Frank Ch. Eigler wrote:
> 
> tsjaseen <jaseen.shamsuddin@wipro.com> writes:
> 
>> [...]
>> I am trying with the systemtap tool to understand the USB subsystem. I've
>> written basic script where the probe point is set for
>> usb_register_driver.
>> [...]
>> After executing this script i am inserting a USB flash due to which the
>> usb-storage module gets loaded. Checked by doing lsmod.
>> But the hook i've set here in the kernel is not getting the event at all.
> 
> Hm, works for me with a slightly more current fc8 kernel.  Try adding
> a "-t" to the stap command line.  It will show you for sure whether a
> probe had been hit.
> 
> 
>> Secondly, if i am setting the probe point for some other symbol exposed
>> by
>> usb-storage module it gives the following error:
>>
>> semantic error: no match for probe point while resolving probe point
>> kernel.function("....")
> 
> You will need to use 
>     probe module("usb-storage").function(....)
> 
> - FChE
> 
> 

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