Thanks Mathieu, I understood now. But where exactly the* lttd with -f and -d* options are used ? Does this really help out in dynamic buffer extraction ??
-srikant On Wed, May 26, 2010 at 6:54 PM, Mathieu Desnoyers < [email protected]> wrote: > * 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 > -- "The Good You Do, The Best You GET" Regards Srikanth Krishnakar **********************
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