$ suffix not working

$ suffix not working

[corpaul]

I am a complete newbie with Systemtap and am trying to get the hang of it...
but when I try to execute from the manual:
stap -e 'probe kernel.function("vfs_read") {printf("%s\n", $$parms$);
exit(); }'

I get the following error message:
root@tud276042:/home/corpaul/Play/probes# stap -e 'probe
kernel.function("vfs_read") {printf("%s\n", $$parms$); exit(); }'
semantic error: unable to find local '$parms$' near pc 0xffffffff810efcae in
vfs_read(/build/buildd-linux-2.6_2.6.32-48squeeze1-amd64-qu4MIV/linux-2.6-2.6.32/debian/build/source_amd64_none/fs/read_write.c)
(alternatives: file buf count pos ret): identifier '$$parms$' at
<input>:1:51
        source: probe kernel.function("vfs_read") {printf("%s\n", $$parms$);
exit(); }
                                                                  ^
Pass 2: analysis failed.  Try again with another '--vp 01' option.

How should I fix this?

Thanks! CP



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Re: $ suffix not working

[Mark Wielaard]

On Thu, 2013-03-07 at 05:45 -0800, corpaul wrote:
> I am a complete newbie with Systemtap and am trying to get the hang of it...
> but when I try to execute from the manual:
> stap -e 'probe kernel.function("vfs_read") {printf("%s\n", $$parms$);
> exit(); }'
> 
> I get the following error message:
> root@tud276042:/home/corpaul/Play/probes# stap -e 'probe
> kernel.function("vfs_read") {printf("%s\n", $$parms$); exit(); }'
> semantic error: unable to find local '$parms$' near pc 0xffffffff810efcae in
> vfs_read(/build/buildd-linux-2.6_2.6.32-48squeeze1-amd64-qu4MIV/linux-2.6-2.6.32/debian/build/source_amd64_none/fs/read_write.c)
> (alternatives: file buf count pos ret): identifier '$$parms$' at
> <input>:1:51
>         source: probe kernel.function("vfs_read") {printf("%s\n", $$parms$);
> exit(); }
>                                                                   ^
> Pass 2: analysis failed.  Try again with another '--vp 01' option.
> 
> How should I fix this?

Which version of stap are you using? (stap --version)
The '$' suffix for pretty printing variables was introduced in 1.3.

Cheers,

Mark

RE: $ suffix not working

[corpaul]

That makes sense - I am using v1.2.

I installed Systemtap on Debian in this way (and assumed it was the latest): http://sourceware.org/systemtap/wiki/SystemtapOnDebian
What is the easiest way to update?

Thanks! CP
________________________________
From: Mark Wielaard-4 [via Sourceware.org] [ml-node+s1504n224575h1@n7.nabble.com]
Sent: Thursday, March 07, 2013 3:37 PM
To: Cor-paul Bezemer - EWI
Subject: Re: $ suffix not working

On Thu, 2013-03-07 at 05:45 -0800, corpaul wrote:

> I am a complete newbie with Systemtap and am trying to get the hang of it...
> but when I try to execute from the manual:
> stap -e 'probe kernel.function("vfs_read") {printf("%s\n", $$parms$);
> exit(); }'
>
> I get the following error message:
> root@tud276042:/home/corpaul/Play/probes# stap -e 'probe
> kernel.function("vfs_read") {printf("%s\n", $$parms$); exit(); }'
> semantic error: unable to find local '$parms$' near pc 0xffffffff810efcae in
> vfs_read(/build/buildd-linux-2.6_2.6.32-48squeeze1-amd64-qu4MIV/linux-2.6-2.6.32/debian/build/source_amd64_none/fs/read_write.c)
> (alternatives: file buf count pos ret): identifier '$$parms$' at
> <input>:1:51
>         source: probe kernel.function("vfs_read") {printf("%s\n", $$parms$);
> exit(); }
>                                                                   ^
> Pass 2: analysis failed.  Try again with another '--vp 01' option.
>
> How should I fix this?

Which version of stap are you using? (stap --version)
The '$' suffix for pretty printing variables was introduced in 1.3.

Cheers,

Mark



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Re: $ suffix not working

[Timo Juhani Lindfors]

corpaul <c.bezemer@tudelft.nl> writes:
> That makes sense - I am using v1.2.
>
> I installed Systemtap on Debian in this way (and assumed it was the latest): http://sourceware.org/systemtap/wiki/SystemtapOnDebian
> What is the easiest way to update?

I'm planning to provide official backports for systemtap starting with
the wheezy release but I'm afraid there is not much point in supporting
them for squeeze anymore.

Could you consider upgrading to wheezy? It still hasn't been released
but it is almost ready.

Re: $ suffix not working

[corpaul]

Updated and works fine now. Thanks!



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