[ltt-dev] Flight Recorder Testing on Linux-2.6.32

[ltt-dev] Flight Recorder Testing on Linux-2.6.32

[srikanth krishnakar]

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
**********************
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[ltt-dev] Flight Recorder Testing on Linux-2.6.32

[srikanth krishnakar]

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
**********************
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[ltt-dev] Flight Recorder Testing on Linux-2.6.32

[srikanth krishnakar]

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
**********************
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[ltt-dev] [URGENT]Re: Flight Recorder Testing on Linux-2.6.32

[srikanth krishnakar]

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 ?

Any input are appreciated !!

Thanks,
Srikant


On Mon, May 24, 2010 at 6:59 PM, srikanth krishnakar
<skrishnakar at gmail.com>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
**********************
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[ltt-dev] [URGENT]Re: Flight Recorder Testing on Linux-2.6.32

[srikanth krishnakar]

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 ?

Any input are appreciated !!

Thanks,
Srikant


On Mon, May 24, 2010 at 6:59 PM, srikanth krishnakar
<skrishnakar at gmail.com>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
**********************
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[ltt-dev] [URGENT]Re: Flight Recorder Testing on Linux-2.6.32

[srikanth krishnakar]

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 ?

Any input are appreciated !!

Thanks,
Srikant


On Mon, May 24, 2010 at 6:59 PM, srikanth krishnakar
<skrishnakar at gmail.com>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
**********************
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[ltt-dev] [URGENT]Re: Flight Recorder Testing on Linux-2.6.32

[Mathieu Desnoyers]

* srikanth krishnakar (skrishnakar at gmail.com) 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
> <skrishnakar at gmail.com>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] [URGENT]Re: Flight Recorder Testing on Linux-2.6.32

[srikanth krishnakar]

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 <
compudj at krystal.dyndns.org> wrote:

> * srikanth krishnakar (skrishnakar at gmail.com) 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
> > <skrishnakar at gmail.com>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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[ltt-dev] [URGENT]Re: Flight Recorder Testing on Linux-2.6.32

[srikanth krishnakar]

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 <
compudj at krystal.dyndns.org> wrote:

> * srikanth krishnakar (skrishnakar at gmail.com) 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
> > <skrishnakar at gmail.com>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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[ltt-dev] [URGENT]Re: Flight Recorder Testing on Linux-2.6.32

[srikanth krishnakar]

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 <
compudj at krystal.dyndns.org> wrote:

> * srikanth krishnakar (skrishnakar at gmail.com) 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
> > <skrishnakar at gmail.com>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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[ltt-dev] [URGENT]Re: Flight Recorder Testing on Linux-2.6.32

[Mathieu Desnoyers]

* srikanth krishnakar (skrishnakar at gmail.com) wrote:
> 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 ??

lttd -d is to put the daemon in background. -f is to select only the
flight recorder channels (prefixed with "flight-"). See lttd --help for
details.

Thanks,

Mathieu

> 
> -srikant
> 
> On Wed, May 26, 2010 at 6:54 PM, Mathieu Desnoyers <
> compudj at krystal.dyndns.org> wrote:
> 
> > * srikanth krishnakar (skrishnakar at gmail.com) 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
> > > <skrishnakar at gmail.com>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
> **********************

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com