Re: LTTng - some problem - not able to see kernel traces

Hi,

see below,

* Naval Saini ([email protected]) wrote:
> Hi:
> 
> I am porting LTTng (version info given below) on linux-2.6.18.2 for arm arch.
> 
>     LTTng  0.6.41
>     LTT Control   0.3.35
> 
> No LTTng userspace tracer
> No Genevent
> 
> I have checked that above config should work from,
>     http://ltt.polymtl.ca/svn/ltt/branches/poly/doc/developer/lttng-lttv-compatibility.html
> 
> I have applied the kernel patches, compiled and installed ltt-control
> on my rootfs. Selected probes options in kernel config as built-in.
> 
> This is the output i am getting. I am only interested in getting kernel traces.
> 
> Maybe someone can tell me if i forgot to include something or merely
> incorrectly trying to use LTTng from command line.
> 
> Thanks and Regards,
> Naval Saini
> 
> 
> 
> # mount /mnt/debugfs
> #
> # lttctl -n trace -d -l /mnt/debugfs/ltt -t /tmp/trace
> 
> 
> Linux Trace Toolkit Trace Control 0.35-12032007
> 
> Controlling trace : trace
> 
> ltt_control : trace trace
> Linux Trace Toolkit Trace Daemon 0.35-12032007
> 
> Reading from debugfs directory : /mnt/debugfs/ltt/trace
> Writing to trace directory : /tmp/trace
> 
> Creating supplementary trace files
> Appending facility file kernel_arch_c2.xml
> Appending facility file kernel_arch_mips.xml
> Appending facility file kernel_arch_ppc.xml
> Appending facility file compact.xml
> Appending facility file locking.xml
> Appending facility file fs_data.xml
> Appending facility file statedump.xml
> Appending facility file kernel_arch_arm.xml
> Appending facility file network.xml
> Appending facility file socket.xml
> Appending facility file timer.xml
> Appending facility file ipc.xml
> Appending facility file kernel_arch_powerpc.xml
> Appending facility file user_generic.xml
> Appending facility file kernel_arch_x86_64.xml
> Appending facility file kernel.xml
> Appending facility file memory.xml
> Appending facility file network_ip_interface.xml
> Appending facility file kernel_arch_i386.xml
> Appending facility file fs.xml
> Appending facility file xen.xml
> Appending facility file core.xml
> Appending facility file process.xml
> Appending facility file stack.xml
> ltt_control : trace trace
> 
> #
> #
> # lttctl -n trace -R
> 
> 
> Linux Trace Toolkit Trace Control 0.35-12032007
> 
> Controlling trace : trace
> 
> ltt_control : trace trace
> ltt_control : trace trace
> finish for cpu 0 , 405dcdb0
> finish for cpu 0 , 405dcc98
> finish for cpu 0 , 405dcb80
> finish for cpu 0 , 405dcaf4
> finish for cpu 0 , 405dc9dc
> finish for cpu 0 , 405dc950
> LTT : facilities_ : 19 events lost in facilities_ channel (cpu 0).

It looks like the events are not even written in the trace. It is most
likely caused by a bad include/asm-arm/ltt.h header where the
timestamping function would return a 0 time. Can you verify this ?


> LTT : unread channel facilities_ offset is 196608 and cons_off : 0 (cpu 0)
> LTT : facilities_ : subbuffer 0 has non zero commit count.
> LTT : facilities_ : commit count : 106, subbuf size 65536
> LTT : unread channel facilities_ offset is 196608 and cons_off : 65536 (cpu 0)
> LTT : facilities_ : commit count : 0, subbuf size 65536
> LTT : unread channel facilities_ offset is 196608 and cons_off : 131072 (cpu 0)
> LTT : facilities_ : subbuffer 0 has non zero commit count.
> LTT : facilities_ : commit count : 106, subbuf size 65536
> LTT : interrupts_ : 6 events lost in interrupts_ channel (cpu 0).
> LTT : unread channel interrupts_ offset is 196608 and cons_off : 0 (cpu 0)
> LTT : interrupts_ : subbuffer 0 has non zero commit count.
> LTT : interrupts_ : commit count : 106, subbuf size 65536
> LTT : unread channel interrupts_ offset is 196608 and cons_off : 65536 (cpu 0)
> LTT : interrupts_ : commit count : 0, subbuf size 65536
> LTT : unread channel interrupts_ offset is 196608 and cons_off : 131072 (cpu 0)
> LTT : interrupts_ : subbuffer 0 has non zero commit count.
> LTT : interrupts_ : commit count : 106, subbuf size 65536
> LTT : processes_ : 17 events lost in processes_ channel (cpu 0).
> LTT : unread channel processes_ offset is 786432 and cons_off : 0 (cpu 0)
> LTT : processes_ : subbuffer 0 has non zero commit count.
> LTT : processes_ : commit count : 106, subbuf size 262144
> LTT : unread channel processes_ offset is 786432 and cons_off : 262144 (cpu 0)
> LTT : processes_ : commit count : 0, subbuf size 262144
> LTT : unread channel processes_ offset is 786432 and cons_off : 524288 (cpu 0)
> LTT : processes_ : subbuffer 0 has non zero commit count.
> LTT : processes_ : commit count : 106, subbuf size 262144
> LTT : modules_ : 6 events lost in modules_ channel (cpu 0).
> LTT : unread channel modules_ offset is 196608 and cons_off : 0 (cpu 0)
> LTT : modules_ : subbuffer 0 has non zero commit count.
> LTT : modules_ : commit count : 106, subbuf size 65536
> LTT : unread channel modules_ offset is 196608 and cons_off : 65536 (cpu 0)
> LTT : modules_ : commit count : 0, subbuf size 65536
> LTT : unread channel modules_ offset is 196608 and cons_off : 131072 (cpu 0)
> LTT : modules_ : subbuffer 0 has non zero commit count.
> LTT : modules_ : commit count : 106, subbuf size 65536
> LTT : cpu_ : 13070 events lost in cpu_ channel (cpu 0).
> LTT : unread channel cpu_ offset is 3145728 and cons_off : 0 (cpu 0)
> LTT : cpu_ : subbuffer 0 has non zero commit count.
> LTT : cpu_ : commit count : 106, subbuf size 1048576
> LTT : unread channel cpu_ offset is 3145728 and cons_off : 1048576 (cpu 0)
> LTT : cpu_ : commit count : 0, subbuf size 1048576
> LTT : unread channel cpu_ offset is 3145728 and cons_off : 2097152 (cpu 0)
> LTT : cpu_ : subbuffer 0 has non zero commit count.
> LTT : cpu_ : commit count : 106, subbuf size 1048576
> LTT : network_ : 6 events lost in network_ channel (cpu 0).
> LTT : unread channel network_ offset is 196608 and cons_off : 0 (cpu 0)
> LTT : network_ : subbuffer 0 has non zero commit count.
> LTT : network_ : commit count : 106, subbuf size 65536
> LTT : unread channel network_ offset is 196608 and cons_off : 65536 (cpu 0)
> LTT : network_ : commit count : 0, subbuf size 65536
> LTT : unread channel network_ offset is 196608 and cons_off : 131072 (cpu 0)
> LTT : network_ : subbuffer 0 has non zero commit count.
> LTT : network_ : commit count : 106, subbuf size 65536
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-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68