* srikanth krishnakar ([email protected]) wrote: > Hello Mathieu, > > In the analysis of COREDUMP using *FLIGHT_RECORDER*, what are the steps I do > need to follow for tracing, because If i follow the steps : > > 1. Connect all markers (ltt-armall) > > 2. Start tracing (lttctl -Cw /tmp/trace1 trace1) > > *Till here every thing is fine... w.r.t trace methods involved. Now say If > here I get KERNEL_PANIC, then what about my trace data that is still pending > and needs to be written to files.* > *I mean till I destroy the channels I will not get the trace data !! * > > How do I resolve this situation !!! where kernel panics and no trace data > available for user ?
You would need support to get your buffers from a crash dump extraction tool (e.g. "crash"). There has been some work done on this in the past by Fujitsu, but that was a few years ago, so I doubt it's aware of the current LTTng buffer layout. So this is currently unsupported. Patches are welcome. :) Thanks, Mathieu > > Any input are appreciated !! > > Thanks, > Srikant > > > On Mon, May 24, 2010 at 6:59 PM, srikanth krishnakar > <[email protected]>wrote: > > > Hi Mathieu, > > > > I am trying to run through the LTTng Flight Recorder test on kernel > > Linux-2.6.32.13. Here are the steps I have followed : > > > > > > 1. Compiled the kernel Linux-2.6.32 + Lttng support > > > > 2. Booted the Lttng kernel > > > > 3. Loaded all the necessary modules, followed by : > > > > 4. Ran "ltt-armall" > > > > 5. Then started the tracing in flight recorder mode as: > > > > # lttctl -C -w /tmp/trace3 -o channel.all.overwrite=1 trace3 > > > > 6. Then destroyed the channels, for write process to take place: > > > > # lttctl -D trace3 > > > > > > Correct me If i am going wrong in any of the above steps, that are > > necessary for flight recorder testing. > > > > What is the difference do I find in normal LTTng tracing and the Flight > > Recorder mode ? What difference does the LTTV-GUI shows for LTTng Flight > > recorder mode ? > > (Is LKCD any way related to core dump tracing in Flight Recorder mode ?) > > > > Are there any additional steps required for carrying out the tracing in > > Flight recorder mode for CORE DUMP tracing. > > > > All the steps i have followed are from : > > http://lttng.org/cgi-bin/gitweb.cgi?p=lttv.git;a=blob_plain;f=LTTngManual.html#flight > > > > Any pointers would be appreciated !! > > > > Thanks in Advance ! > > > > Regards > > Srikanth Krishnakar > > ********************** > > > > > > -- > "The Good You Do, The Best You GET" > > Regards > Srikanth Krishnakar > ********************** -- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com _______________________________________________ ltt-dev mailing list [email protected] http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
