Re: Command line arg for kernel Tracepoints

[h patel <hpatel05 at gmail dot com>]

Sorry, forgot to reply all.

Hi,

It didn't work. Script can take the argument but kernel.trace can not.
Looks like kernel.trace only handles pattern, not argument.
In that case, I will limit down the types of events.

Thanks,
hp

Error :
parse error: expected literal string or number
? ? ? ?saw: identifier 'tpoint' at test.stp:9:20
? ? source: probe kernel.trace(tpoint) { printf("%s
called\n",kernel_string($log)) }

On Thu, Dec 30, 2010 at 3:08 PM, Adrien Kunysz <adrien@kunysz.be> wrote:
> I don't think that will ever work like that as @1 and $1 are expanded at
> compile time (I think). You probably need to use a named global variable
> as described in the "ARGUMENTS" section of staprun(8).
>
> ? ? ? ?global tpoint = "whateverDefaultProbeYouLike"
> ? ? ? ?probe kernel.trace(tpoint) { printf("oh hai\n") }
>
> # stap -m test test.stp
> # staprun test.ko tpoint="anotherTracepoint"
>
> I haven't verified this will work.
>
> On Thu, Dec 30, 2010 at 02:59:58PM +0530, h patel wrote:
>> It's cross compile :
>> host> stap -gv -r /linux-2.6.32.10 -I /target/share/systemtap/tapset
>> -R /target/share/systemtap/runtime -m test test.stp -v
>>
>> host> cat test.stp
>>
>> #! /usr/bin/env stap
>>
>> # Note when we turn the monitor on and off
>> probe begin { printf("Monitoring for wncreg\n") }
>> probe end { printf("Stopping monitor\n") }
>>
>> probe kernel.trace(@1) { printf("%s called\n",kernel_string($log)) }
>>
>>
>>
>>
>> On Thu, Dec 30, 2010 at 2:52 PM, Adrien Kunysz <adrien@kunysz.be> wrote:
>> > On Thu, Dec 30, 2010 at 01:55:26PM +0530, h patel wrote:
>> >> parse error: command line argument index 1 out of range [1-0]
>> >
>> > This means @1 and $1 don't exist as no argument was passed to the script
>> > and I doubt this has anything to do with .trace itself. How did you run
>> > the script?
>> >
>> > -----BEGIN PGP SIGNATURE-----
>> > Version: GnuPG v1.4.9 (GNU/Linux)
>> >
>> > iEYEARECAAYFAk0cT2sACgkQKLX03ZSPZGxRBgCeL/KX+tOJDvgXDy/qz9jR4a+U
>> > uNYAoJszrKWPVm2B3a9n56oavpo7gcR3
>> > =NCSz
>> > -----END PGP SIGNATURE-----
>> >
>> >
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.9 (GNU/Linux)
>
> iEYEARECAAYFAk0cUzIACgkQKLX03ZSPZGwuMQCgisjEWsv6UfkD48ws/TdFt/qL
> 0moAniM28a+br6l+vU245Rjb2czhtTwv
> =PkyI
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>
>