[Bug runtime/10605] New: Unknown symbol in module error (Unknown symbol si_swapinfo)

[Bug runtime/10605] New: Unknown symbol in module error (Unknown symbol si_swapinfo)

[wangkai at noahsi dot com dot cn]

I have this script.
#cat test.stp
%{
#include <linux/swap.h>
%}

function get_swap_total:long()
%{
        struct sysinfo i;
        si_swapinfo(&i);
        THIS->__retvalue = i.totalswap;

%}

probe timer.s(1)
{
        printf("%d\n", get_swap_total())
        exit()
}

Errors I get are,
#stap -v -g test.stp
Pass 1: parsed user script and 45 library script(s) in 210usr/0sys/217real ms.
Pass 2: analyzed script: 1 probe(s), 2 function(s), 1 embed(s), 0 global(s) in
0usr/0sys/4real ms.
Pass 3: translated to C into
"/tmp/stap8S0mHK/stap_511a6ca4d792dbeb7a947b7bb78723aa_470.c" in
60usr/250sys/310real ms.
Pass 4: compiled C into "stap_511a6ca4d792dbeb7a947b7bb78723aa_470.ko" in
2290usr/360sys/2594real ms.
Pass 5: starting run.
Error inserting module
'/tmp/stap8S0mHK/stap_511a6ca4d792dbeb7a947b7bb78723aa_470.ko': Unknown symbol
in module
Pass 5: run completed in 0usr/10sys/7real ms.
Pass 5: run failed.  Try again with more '-v' (verbose) options.

#dmesg
stap_511a6ca4d792dbeb7a947b7bb78723aa_470: Unknown symbol si_swapinfo


How to call this function(si_swapinfo)?

Thanks,
WK.

-- 
           Summary: Unknown symbol in module error (Unknown symbol
                    si_swapinfo)
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: wangkai at noahsi dot com dot cn


http://sourceware.org/bugzilla/show_bug.cgi?id=10605

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[Bug runtime/10605] Unknown symbol in module error (Unknown symbol si_swapinfo)

[fche at redhat dot com]

------- Additional Comments From fche at redhat dot com  2009-09-04 14:00 -------
Without special tricks, you can only call functions and refer to
symbols that were marked EXPORT_SYMBOL[_GPL] by the kernel.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING


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[Bug runtime/10605] Unknown symbol in module error (Unknown symbol si_swapinfo)

[dsmith at redhat dot com]

------- Additional Comments From dsmith at redhat dot com  2009-09-04 14:09 -------
It looks like si_swapinfo() is only exported for s390.  If you are on s390, then
you've found a systemtap bug.

If you aren't using a vendor-supplied kernel, you could add the following line
(most likely to mm/swapfile.c) and recompile:

EXPORT_SYMBOL_GPL(si_swapinfo);

-- 


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[Bug runtime/10605] Unknown symbol in module error (Unknown symbol si_swapinfo)

[wangkai at noahsi dot com dot cn]

------- Additional Comments From wangkai at noahsi dot com dot cn  2009-09-07 02:19 -------
Thanks a lot.

arch is x86_64.
I will try to recompile.

-------------

-- 


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[Bug runtime/10605] Unknown symbol in module error (Unknown symbol si_swapinfo)

[wangkai at noahsi dot com dot cn]

------- Additional Comments From wangkai at noahsi dot com dot cn  2009-09-07 09:45 -------
hi,

test env:
kernel version : 2.6.18
arch           : x86

I add "EXPORT_SYMBOL(si_swapinfo);" to mm/swapfile.c and recompile.
it's ok.

but if I using a vendor-supplied kernel,how can I get this info?


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[Bug runtime/10605] Unknown symbol in module error (Unknown symbol si_swapinfo)

[wenji dot huang at oracle dot com]

------- Additional Comments From wenji dot huang at oracle dot com  2009-09-07 10:06 -------
(In reply to comment #4)
> but if I using a vendor-supplied kernel,how can I get this info?
> 
Need to do a little tricky things to implement your own si_swapinfo.
for non-cross compilation situation, you can follow this.
In si_swapinfo, there are only three kernel variables needed swap_info, 
nr_swap_pages, total_swap_pages.

1. To look up the address for variables from System.map
2. Do type cast, from address to structures or unsigned long.
3. Wrote your own si_swapinfo in reference of kernel source.

-- 


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[Bug runtime/10605] Unknown symbol in module error (Unknown symbol si_swapinfo)

[wangkai at noahsi dot com dot cn]

------- Additional Comments From wangkai at noahsi dot com dot cn  2009-09-08 05:40 -------
Did the trick. Thanks for your help.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |FIXED


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