[ltt-dev] No marker of name kernel_arch_syscall_entry found

[Stefano Babic]

Hi all,

I applied lttng 0.10.0-pre52 on kernel 2.6.25 for an embedded system
based on powerpc. In the past I had lttng 0.9.10 and kernel 2.6.22.

I can apply all patches to the kernel and the target seems working
flawless. I can start collecting traces with ltt-ctl (I tried version
0.44 and version 0.48) and I get traces in the directory I set.

However, lttv does not display the traces. I tried
lttv-0.10.0-pre13-27052008, but it crashes as follows:

** (process:31869): WARNING **: parse_trace_header error
** (process:31869): WARNING **: parse_trace_header error
** (process:31869): WARNING **: No marker of name
kernel_arch_syscall_entry found
(process:31869): GLib-CRITICAL **: g_array_remove_range: assertion
`index_ < array->len' failed
** (process:31869): WARNING **: No marker of name kernel_arch_trap_entry
found
bin/lttv: line 15: 31869 Segmentation fault      $0.real $*



I downloaded the last version from the svn repository. This does not
crash, but it reports that it founds no markers:

** (lttv.real:19934): WARNING **: No marker of name list_statedump_end found
** (lttv.real:19934): WARNING **: No marker of name
kernel_sched_schedule found
** (lttv.real:19934): WARNING **: No marker of name kernel_process_fork
found
** (lttv.real:19934): WARNING **: No marker of name kernel_process_exit
found
** (lttv.real:19934): WARNING **: No marker of name fs_exec found
.....

Only the events core_marker_id and core_marker_format are displayed. No
process is shown in the traces.

I see no problem during kernel compilation and in Module.markers I see
the markers that lttv does not find, for example:

kernel_process_fork     vmlinux parent_pid %d child_pid %d child_tgid %d

Which could be the reason lttv does not find the markers ?

I have see a different behavior between lttctl-0.44 and lttctl-0.48,too.
The former version generates xml files in the eventdef directory for all
facilities :

-bash-3.2# lttctl -n trace -d -l /mnt/debugfs/ltt -t /tmp/trace
Linux Trace Toolltt_control : trace trace
kit Trace Control 0.44-21092007

Controlling trace : trace
Linux Trace Toolkit Trace Daemon 0.44-21092007
Reading from debugfs directory : /mnt/debugfs/ltt/trace
Writing to trace directory : /tmp/trace

Creating supplementary trace files
Appending facility file core.xml
Appending facility file fs.xml
Appending facility file kernel.xml
Appending facility file kernel_arch_arm.xml
....

Version 0.48 does not generate the eventdef at all. Is this the correct
behavior ? Or probably is something wrong on my system ?

Kind regards,
Stefano

-- 
stefano <stefano.babic at babic.homelinux.org>
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