[ltt-dev] Trouble acquiring/displaying traces

Sun Jun 8 19:19:01 EDT 2008

Hi Mathieu -

I think the attached gziped tar file should have everything you are looking 
for; it's
got the directory where I directed everything to go via:

   lttctl -n trace -d -l /mnt/debugfs/ltt -t /tmp/ltt

The tar file is of 'ltt' in /tmp.

Looks like facilities files are in this as well.

Please let me know how I can help.  Thanks again for your swift responses;
this looks like a great tool, so I am happy to do anything I can to resolve 
either
problems on my end, or development issues.

It's a dual quad-core Xeon machine that I am running this one.

Regards,

tom

----- Original Message ----- 
From: "Mathieu Desnoyers" <compudj at krystal.dyndns.org>
To: "Thomas E. Besemer" <tbesemer at thomas-iv.com>
Cc: <ltt-dev at lists.casi.polymtl.ca>
Sent: Sunday, June 08, 2008 3:13 PM
Subject: Re: [ltt-dev] Trouble acquiring/displaying traces

> Can you give me the content of the control/ trace subdirectory ?
>
> Also an hexdump of the facilities_* files (only the 20 first lines).
>
> Thanks,
>
> Mathieu
>
> * Thomas E. Besemer (tbesemer at thomas-iv.com) wrote:
>> Hi Mathieu (and all  on list) -
>>
>> Thanks for correcting my problems on patch install; it was
>> operator error on my part.  I got patched, compiled, linked
>> and booted, but seem to be having trouble getting traces
>> (see end of email).
>>
>> Note that everything in LTT is compiled into the Kernel,
>> no modules.
>>
>> Between starting and stoping trace, I ran some commands, and
>> tar'd up a directory to show I/O, etc...
>>
>> Below is a sequence of what I am doing.
>>
>> All help appreciated.
>>
>> Thanks,
>>
>> tom
>>
>> --
>> Installed Patches/tools, 2.6.25.4 Kernel:
>>
>> patch-2.6.25.4-lttng-0.10-pre55
>> ltt-control-0.48-27022008
>> lttv-0.10.0-pre13-27052008
>>
>> --
>> Boot Messages:
>>
>> LTT : ltt-heartbeat init
>> LTT : ltt-heartbeat init
>> Requested number of bits 11
>> Available number of bits 11
>> Heartbeat timer will fire each 33 jiffies.
>> Compact TSC init : truncate 8 lsb, cutoff 3 msb.
>> LTT : ltt-relay init
>> ltt-control init
>> LTT : State dump init
>> Data shifted from 24 bits
>> 3 bits used for event IDs, 8 available for data.
>>
>>
>> ---
>> LTT Arm All Messages:
>>
>> [root at sn-sj26 tbesemer]# ltt-armall
>> Loading probes
>> FATAL: Could not load /lib/modules/2.6.25.4/modules.dep: No such file or
>> directory
>> Connecting all markers
>> Connecting internal_kernel_sched_schedule
>> Connecting fs_buffer_wait_end
>> Connecting fs_buffer_wait_start
>> Connecting fs_close
>> Connecting fs_exec
>> Connecting fs_ioctl
>> Connecting fs_llseek
>>
>> [snip much - lot's of output here]
>>
>>
>> ---
>> Starting Trace:
>>
>> [root at sn-sj26 tbesemer]# lttctl -n trace -d -l /mnt/debugfs/ltt -t 
>> /tmp/ltt
>> Linux Trace Toolkit Trace Control 0.48-27022008
>>
>> Controlling trace : trace
>>
>> Linux Trace Toolkit Trace Daemon 0.48-27022008
>>
>> Reading from debugfs directory : /mnt/debugfs/ltt/trace
>> Writing to trace directory : /tmp/ltt
>>
>> [root at sn-sj26 tbesemer]#
>>
>>
>> ---
>> Stoping Trace:
>>
>> [root at sn-sj26 tbesemer]# lttctl -n trace -R
>> Linux Trace Toolkit Trace Control 0.48-27022008
>>
>> Controlling trace : trace
>>
>> [root at sn-sj26 tbesemer]#
>>
>>
>> ---
>> What's in /tmp/ltt:
>>
>> [root at sn-sj26 tbesemer]# ls -rtl /tmp/ltt
>> total 8232
>> drwxr-xr-x 2 root root    4096 May 30 11:43 eventdefs
>> drwxr-xr-x 2 root root    4096 May 30 11:43 control
>> -rwxr-xr-x 1 root root 1048576 May 30 11:45 cpu_7
>> -rwxr-xr-x 1 root root 1048576 May 30 11:45 cpu_6
>> -rwxr-xr-x 1 root root 1048576 May 30 11:45 cpu_5
>> -rwxr-xr-x 1 root root 1048576 May 30 11:45 cpu_4
>> -rwxr-xr-x 1 root root 1048576 May 30 11:45 cpu_3
>> -rwxr-xr-x 1 root root 1048576 May 30 11:45 cpu_2
>> -rwxr-xr-x 1 root root 1048576 May 30 11:45 cpu_1
>> -rwxr-xr-x 1 root root 1048576 May 30 11:45 cpu_0
>> -rwxr-xr-x 1 root root       0 Jun  8 10:35 compact_7
>> -rwxr-xr-x 1 root root       0 Jun  8 10:35 compact_6
>> -rwxr-xr-x 1 root root       0 Jun  8 10:35 compact_5
>> -rwxr-xr-x 1 root root       0 Jun  8 10:35 compact_4
>> -rwxr-xr-x 1 root root       0 Jun  8 10:35 compact_3
>> -rwxr-xr-x 1 root root       0 Jun  8 10:35 compact_2
>> -rwxr-xr-x 1 root root       0 Jun  8 10:35 compact_1
>> -rwxr-xr-x 1 root root       0 Jun  8 10:35 compact_0
>> [root at sn-sj26 tbesemer]#
>>
>>
>>
>> ---
>> Doing Basic dump of Trace:
>>
>> [root at sn-sj26 tbesemer]# lttv -m textDump -t /tmp/ltt
>> The input data file /tmp/ltt/compact_5 does not contain a trace
>> The input data file /tmp/ltt/compact_6 does not contain a trace
>>
>> ** (process:10083): WARNING **: Unsupported trace version : 0.8
>>
>> ** (process:10083): WARNING **: parse_trace_header error
>> The input data file /tmp/ltt/compact_4 does not contain a trace
>>
>> ** (process:10083): WARNING **: Unsupported trace version : 0.8
>>
>> ** (process:10083): WARNING **: parse_trace_header error
>> The input data file /tmp/ltt/compact_3 does not contain a trace
>> The input data file /tmp/ltt/compact_7 does not contain a trace
>>
>> ** (process:10083): WARNING **: Unsupported trace version : 0.8
>>
>> [snip lot's of similar output, finishing with this below]
>>
>>
>> ** (process:10665): WARNING **: parse_trace_header error
>> The input data file /tmp/ltt/compact_2 does not contain a trace
>>
>> ** ERROR **: Trace /tmp/ltt has no facility tracefile
>> aborting...
>> /workspace/tbesemer/local/bin/lttv: line 15: 10665 Aborted $0.real $*
>> [root at sn-sj26 tbesemer]#
>>
>>
>>
>>
>> _______________________________________________
>> ltt-dev mailing list
>> ltt-dev at lists.casi.polymtl.ca
>> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
>>
>
> -- 
> Mathieu Desnoyers
> OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 
> 9A68 
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