[ltt-dev] Steps to test LTTng on Linux-2.6.29 PowerPC

[mathieu.desnoyers@polymtl.ca (Mathieu Desnoyers)]

* srikanth krishnakar (skrishnakar at gmail.com) wrote:
> Hi Mathieu,
> 
> Arch: PowerPC
> 
> Just to re-write the steps for running the LTTng-0.65 for kernel
> linux-2.6.29, please comments on the steps performed for tracing, or if any
> modification required:
> 
> 1. Create debugfs directory
> 
> $ mkdir /mnt/debugfs
> 
> 2. Get the backup of fstab
> 
> $ cp /etc/fstab /etc/fstab.lttng.bkp
> 
> 3. Write to /etc/fstab for automounting of debugfs
> 
> $ echo "debugfs   /mnt/debugfs  debugfs rw    0   0"  >> /etc/fstab
> 
> 
> 4.You can automate at boot time loading the ltt-control module by :
> 
> a.> Get the bakup of /etc/modules
> 
> $ cp /etc/modules /etc/modules.bkp
> 
> b.> Now execute the following :
> 
> echo ltt-trace-control >> /etc/modules
> echo ltt-marker-control >> /etc/modules
> echo ltt-tracer >> /etc/modules
> echo ltt-serialize >> /etc/modules
> echo ltt-relay >> /etc/modules
> echo ipc-trace >> /etc/modules
> echo kernel-trace >> /etc/modules
> echo mm-trace >> /etc/modules
> echo net-trace >> /etc/modules
> echo fs-trace >> /etc/modules
> echo jbd2-trace >> /etc/modules
> echo ext4-trace >> /etc/modules
> echo syscall-trace >> /etc/modules
> echo trap-trace >> /etc/modules
> 
> ----------------------------------------------------
> Test modules loaded :
> 
> root at xilinx:~# lsmod
> Module                  Size  Used by
> ltt_serialize          11676  1 ltt_marker_control
> ltt_marker_control      4932  1 ltt_trace_control
> ltt_trace_control      16196  0
> ipc_trace               2124  4
> kernel_trace           14876  41
> mm_trace                4892  12
> net_trace               9116  23
> fs_trace                5404  16
> syscall_trace           1652  2
> trap_trace              1628  2
> root at xilinx:~#
> -----------------------------------------------------
> 
> 5.Now start tracing
> 
> 
> >>> Before that don't forget to connect all the markers :
> 
> $ ltt-armall
> 
> .....................................................
> 
> Expected output:
> 
> 
> t at xilinx:~# ltt-armall
> Connecting all markers
> Connecting /mnt/debugfs/ltt/markers/fs/buffer_wait_end
> Connecting /mnt/debugfs/ltt/markers/fs/buffer_wait_start
> Connecting /mnt/debugfs/ltt/markers/fs/close
> Connecting /mnt/debugfs/ltt/markers/fs/exec
> Connecting /mnt/debugfs/ltt/markers/fs/ioctl
> Connecting /mnt/debugfs/ltt/markers/fs/llseek
> Connecting /mnt/debugfs/ltt/markers/fs/lseek
> Connecting /mnt/debugfs/ltt/markers/fs/open
> Connecting /mnt/debugfs/ltt/markers/fs/pollfd
> Connecting /mnt/debugfs/ltt/markers/fs/pread64
> Connecting /mnt/debugfs/ltt/markers/fs/pwrite64
> Connecting /mnt/debugfs/ltt/markers/fs/read
> Connecting /mnt/debugfs/ltt/markers/fs/readv
> Connecting /mnt/debugfs/ltt/markers/fs/select
> Connecting /mnt/debugfs/ltt/markers/fs/write
> Connecting /mnt/debugfs/ltt/markers/fs/writev
> Connecting /mnt/debugfs/ltt/markers/input/input_event
> .........
> .........
> .........
> .........
> * Truncated full log *
> .....................................................
> 
> 
> $ lttctl -C -w /tmp/trace1 trace1
> 
> -----------------------------------------
> 
> Expected output
> 
> root at xilinx:~# lttctl -C -w /tmp/trace1 trace1
> Linux Trace Toolkit Trace Control 0.67-05032009
> 
> Controlling trace : trace1
> 
> lttctl: Creating trace
> lttctl: Forking lttd
> Linux Trace Toolkit Trace Daemon 0.67-05032009
> 
> Reading from debugfs directory : /mnt/debugfs/ltt/trace1
> Writing to trace directory : /tmp/trace1
> 
> lttctl: Starting trace
> root at xilinx:~#
> -------------------------------------------
> 

Don't forget to stop tracing before doing the textDump.

> 6. Dump output trace in text format:
> 
> $ lttv -m textDump -t /tmp/trace1  > Log-trace-text-format.txt
> 
> 7. Dump output to a .lttng file for viewing in GUI environment :
> 
> $ lttv -m textDump -t /tmp/trace1 >* Lttng-out.lttng *
> 

Hm ? The gui environment works directly on the binary trace, not on a
text output.

> 
> Please correct my steps, How can I create LTTng file that can be viewed
> graphically (unlike earlier method of tracedump > $
> 
> lttv -m textDump -t tracedump > Lttng-out.lttng
> 
> )
> 
> How Can I get the tracedump for particular trace ?
> 
> Thanks in Advance !!
> 

Just run:

lttv-gui /tmp/trace1

If you cannot run the GUI on your target machine, simply copy the
/tmp/trace1 directly to a different machine (can be powerpc, x86...) and
run lttv-gui from there.

Mathieu

> 
> Regards
> Srikanth Krishnakar
> **********************

-- 
Mathieu Desnoyers
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