get function names with lttng-ust-cyg-profile

get function names with lttng-ust-cyg-profile

[Liu, Changcheng via lttng-dev]

Hi all,
   I'm trying to use lttng-ust-cyg-profile to trace program.
   Does anyone know how to get function names and offset through lttng-ust-cyg-profile?

   In below example, the babeltrace could only get the function entry/exit value.
   1. Source program: instrument.c
         1 #include <stdio.h>
         2 
         3 int add3(int val) {
         4         return val + 3;
         5 }
         6 
         7 int main(int argc, char **argv) {
         8     int x = 4;
         9     
        10     puts("Press Enter to continue...");
        11     getchar();
        12     
        13     x = add3(x);
        14     
        15     return 0;
        16 }

   2. build source code:
        $ gcc -g -finstrument-functions instrument.c -o instrument

   3. run program:
       $ LD_PRELOAD=/usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile.so ./instrument

   4. start trace process:
       trace@trace:~/cc$ sudo lttng create instrument
       Session instrument created.
       Traces will be output to /root/lttng-traces/instrument-20200623-222917

       trace@trace:~/cc$ sudo lttng enable-channel user_func_trace --userspace
       UST channel user_func_trace enabled for session instrument

       trace@trace:~/cc$ sudo lttng enable-event --userspace lttng_ust_cyg_profile:func_entry --channel user_func_trace
       UST event lttng_ust_cyg_profile:func_entry created in channel user_func_trace
       trace@trace:~/cc$ sudo lttng enable-event --userspace lttng_ust_cyg_profile:func_exit --channel user_func_trace
       UST event lttng_ust_cyg_profile:func_exit created in channel user_func_trace

       trace@trace:~/cc$ sudo lttng start
       Tracing started for session instrument

       trace@trace:~/cc$ sudo lttng destroy
       Destroying session instrument..
       Session instrument destroyed

       trace@trace:~/cc$ sudo babeltrace /root/lttng-traces/instrument-20200623-222917
       [22:29:55.388607059] (+?.?????????) trace lttng_ust_cyg_profile:func_entry: { cpu_id = 2 }, { addr = 0x5625C88B01A9, call_site = 0x5625C88B0237 }
       [22:29:55.388612293] (+0.000005234) trace lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr = 0x5625C88B01A9, call_site = 0x5625C88B0237 }
       [22:29:55.388613215] (+0.000000922) trace lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr = 0x5625C88B01EE, call_site = 0x7FE40BD5C0B3 }

B.R.
Changcheng

[lttng-dev] get function names with lttng-ust-cyg-profile

[Liu, Changcheng via lttng-dev]

Hi all,
   I'm trying to use lttng-ust-cyg-profile to trace program.
   Does anyone know how to get function names and offset through lttng-ust-cyg-profile?

   In below example, the babeltrace could only get the function entry/exit value.
   1. Source program: instrument.c
         1 #include <stdio.h>
         2 
         3 int add3(int val) {
         4         return val + 3;
         5 }
         6 
         7 int main(int argc, char **argv) {
         8     int x = 4;
         9     
        10     puts("Press Enter to continue...");
        11     getchar();
        12     
        13     x = add3(x);
        14     
        15     return 0;
        16 }

   2. build source code:
        $ gcc -g -finstrument-functions instrument.c -o instrument

   3. run program:
       $ LD_PRELOAD=/usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile.so ./instrument

   4. start trace process:
       trace@trace:~/cc$ sudo lttng create instrument
       Session instrument created.
       Traces will be output to /root/lttng-traces/instrument-20200623-222917

       trace@trace:~/cc$ sudo lttng enable-channel user_func_trace --userspace
       UST channel user_func_trace enabled for session instrument

       trace@trace:~/cc$ sudo lttng enable-event --userspace lttng_ust_cyg_profile:func_entry --channel user_func_trace
       UST event lttng_ust_cyg_profile:func_entry created in channel user_func_trace
       trace@trace:~/cc$ sudo lttng enable-event --userspace lttng_ust_cyg_profile:func_exit --channel user_func_trace
       UST event lttng_ust_cyg_profile:func_exit created in channel user_func_trace

       trace@trace:~/cc$ sudo lttng start
       Tracing started for session instrument

       trace@trace:~/cc$ sudo lttng destroy
       Destroying session instrument..
       Session instrument destroyed

       trace@trace:~/cc$ sudo babeltrace /root/lttng-traces/instrument-20200623-222917
       [22:29:55.388607059] (+?.?????????) trace lttng_ust_cyg_profile:func_entry: { cpu_id = 2 }, { addr = 0x5625C88B01A9, call_site = 0x5625C88B0237 }
       [22:29:55.388612293] (+0.000005234) trace lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr = 0x5625C88B01A9, call_site = 0x5625C88B0237 }
       [22:29:55.388613215] (+0.000000922) trace lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr = 0x5625C88B01EE, call_site = 0x7FE40BD5C0B3 }

B.R.
Changcheng
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Re: get function names with lttng-ust-cyg-profile

[Matthew Khouzam via lttng-dev]

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Hi,

You have the pointers that are traced. Babeltrace is doing exactly what it should as far as I know.

You could use the command 'nm' to get your symbols and look them up. I am sure Babeltrace can do this from a python level. You could also use a GUI based trace viewer to get the information.

Hope that helps.
Matthew
________________________________
From: lttng-dev <lttng-dev-bounces@lists.lttng.org> on behalf of Liu, Changcheng via lttng-dev <lttng-dev@lists.lttng.org>
Sent: Tuesday, June 23, 2020 10:37 AM
To: lttng-dev@lists.lttng.org <lttng-dev@lists.lttng.org>
Cc: changcheng.liu@intel.com <changcheng.liu@intel.com>
Subject: [lttng-dev] get function names with lttng-ust-cyg-profile

Hi all,
   I'm trying to use lttng-ust-cyg-profile to trace program.
   Does anyone know how to get function names and offset through lttng-ust-cyg-profile?

   In below example, the babeltrace could only get the function entry/exit value.
   1. Source program: instrument.c
         1 #include <stdio.h>
         2
         3 int add3(int val) {
         4         return val + 3;
         5 }
         6
         7 int main(int argc, char **argv) {
         8     int x = 4;
         9
        10     puts("Press Enter to continue...");
        11     getchar();
        12
        13     x = add3(x);
        14
        15     return 0;
        16 }

   2. build source code:
        $ gcc -g -finstrument-functions instrument.c -o instrument

   3. run program:
       $ LD_PRELOAD=/usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile.so ./instrument

   4. start trace process:
       trace@trace:~/cc$ sudo lttng create instrument
       Session instrument created.
       Traces will be output to /root/lttng-traces/instrument-20200623-222917

       trace@trace:~/cc$ sudo lttng enable-channel user_func_trace --userspace
       UST channel user_func_trace enabled for session instrument

       trace@trace:~/cc$ sudo lttng enable-event --userspace lttng_ust_cyg_profile:func_entry --channel user_func_trace
       UST event lttng_ust_cyg_profile:func_entry created in channel user_func_trace
       trace@trace:~/cc$ sudo lttng enable-event --userspace lttng_ust_cyg_profile:func_exit --channel user_func_trace
       UST event lttng_ust_cyg_profile:func_exit created in channel user_func_trace

       trace@trace:~/cc$ sudo lttng start
       Tracing started for session instrument

       trace@trace:~/cc$ sudo lttng destroy
       Destroying session instrument..
       Session instrument destroyed

       trace@trace:~/cc$ sudo babeltrace /root/lttng-traces/instrument-20200623-222917
       [22:29:55.388607059] (+?.?????????) trace lttng_ust_cyg_profile:func_entry: { cpu_id = 2 }, { addr = 0x5625C88B01A9, call_site = 0x5625C88B0237 }
       [22:29:55.388612293] (+0.000005234) trace lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr = 0x5625C88B01A9, call_site = 0x5625C88B0237 }
       [22:29:55.388613215] (+0.000000922) trace lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr = 0x5625C88B01EE, call_site = 0x7FE40BD5C0B3 }

B.R.
Changcheng
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Re: [lttng-dev] get function names with lttng-ust-cyg-profile

[Matthew Khouzam via lttng-dev]

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Hi,

You have the pointers that are traced. Babeltrace is doing exactly what it should as far as I know.

You could use the command 'nm' to get your symbols and look them up. I am sure Babeltrace can do this from a python level. You could also use a GUI based trace viewer to get the information.

Hope that helps.
Matthew
________________________________
From: lttng-dev <lttng-dev-bounces@lists.lttng.org> on behalf of Liu, Changcheng via lttng-dev <lttng-dev@lists.lttng.org>
Sent: Tuesday, June 23, 2020 10:37 AM
To: lttng-dev@lists.lttng.org <lttng-dev@lists.lttng.org>
Cc: changcheng.liu@intel.com <changcheng.liu@intel.com>
Subject: [lttng-dev] get function names with lttng-ust-cyg-profile

Hi all,
   I'm trying to use lttng-ust-cyg-profile to trace program.
   Does anyone know how to get function names and offset through lttng-ust-cyg-profile?

   In below example, the babeltrace could only get the function entry/exit value.
   1. Source program: instrument.c
         1 #include <stdio.h>
         2
         3 int add3(int val) {
         4         return val + 3;
         5 }
         6
         7 int main(int argc, char **argv) {
         8     int x = 4;
         9
        10     puts("Press Enter to continue...");
        11     getchar();
        12
        13     x = add3(x);
        14
        15     return 0;
        16 }

   2. build source code:
        $ gcc -g -finstrument-functions instrument.c -o instrument

   3. run program:
       $ LD_PRELOAD=/usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile.so ./instrument

   4. start trace process:
       trace@trace:~/cc$ sudo lttng create instrument
       Session instrument created.
       Traces will be output to /root/lttng-traces/instrument-20200623-222917

       trace@trace:~/cc$ sudo lttng enable-channel user_func_trace --userspace
       UST channel user_func_trace enabled for session instrument

       trace@trace:~/cc$ sudo lttng enable-event --userspace lttng_ust_cyg_profile:func_entry --channel user_func_trace
       UST event lttng_ust_cyg_profile:func_entry created in channel user_func_trace
       trace@trace:~/cc$ sudo lttng enable-event --userspace lttng_ust_cyg_profile:func_exit --channel user_func_trace
       UST event lttng_ust_cyg_profile:func_exit created in channel user_func_trace

       trace@trace:~/cc$ sudo lttng start
       Tracing started for session instrument

       trace@trace:~/cc$ sudo lttng destroy
       Destroying session instrument..
       Session instrument destroyed

       trace@trace:~/cc$ sudo babeltrace /root/lttng-traces/instrument-20200623-222917
       [22:29:55.388607059] (+?.?????????) trace lttng_ust_cyg_profile:func_entry: { cpu_id = 2 }, { addr = 0x5625C88B01A9, call_site = 0x5625C88B0237 }
       [22:29:55.388612293] (+0.000005234) trace lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr = 0x5625C88B01A9, call_site = 0x5625C88B0237 }
       [22:29:55.388613215] (+0.000000922) trace lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr = 0x5625C88B01EE, call_site = 0x7FE40BD5C0B3 }

B.R.
Changcheng
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Re: get function names with lttng-ust-cyg-profile

[Christophe Bédard via lttng-dev]

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Hi,

Babeltrace is doing exactly what it should as far as I know.
>

yes, but babeltrace *can* provide the information if:

* ip and vpid contexts are enabled (for userspace), e.g.

$ lttng add-context --userspace --type=ip --type=vpid

* LTTng state dump events are enabled, e.g.

$ lttng enable-event --userspace 'lttng_ust_statedump:*'


see this (from bt2 but it also applies to bt1):
https://babeltrace.org/docs/v2.0/man7/babeltrace2-filter.lttng-utils.debug-info.7/#doc-lttng-prereq

Note that the Python bindings for babeltrace don't provide/expose this
debug info.


Christophe

On Tue, 23 Jun 2020 at 11:12, Matthew Khouzam via lttng-dev <
lttng-dev@lists.lttng.org> wrote:

> Hi,
>
> You have the pointers that are traced. Babeltrace is doing exactly what it
> should as far as I know.
>
> You could use the command 'nm' to get your symbols and look them up. I am
> sure Babeltrace can do this from a python level. You could also use a GUI
> based trace viewer to get the information.
>
> Hope that helps.
> Matthew
> ------------------------------
> *From:* lttng-dev <lttng-dev-bounces@lists.lttng.org> on behalf of Liu,
> Changcheng via lttng-dev <lttng-dev@lists.lttng.org>
> *Sent:* Tuesday, June 23, 2020 10:37 AM
> *To:* lttng-dev@lists.lttng.org <lttng-dev@lists.lttng.org>
> *Cc:* changcheng.liu@intel.com <changcheng.liu@intel.com>
> *Subject:* [lttng-dev] get function names with lttng-ust-cyg-profile
>
> Hi all,
>    I'm trying to use lttng-ust-cyg-profile to trace program.
>    Does anyone know how to get function names and offset through
> lttng-ust-cyg-profile?
>
>    In below example, the babeltrace could only get the function entry/exit
> value.
>    1. Source program: instrument.c
>          1 #include <stdio.h>
>          2
>          3 int add3(int val) {
>          4         return val + 3;
>          5 }
>          6
>          7 int main(int argc, char **argv) {
>          8     int x = 4;
>          9
>         10     puts("Press Enter to continue...");
>         11     getchar();
>         12
>         13     x = add3(x);
>         14
>         15     return 0;
>         16 }
>
>    2. build source code:
>         $ gcc -g -finstrument-functions instrument.c -o instrument
>
>    3. run program:
>        $ LD_PRELOAD=/usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile.so
> ./instrument
>
>    4. start trace process:
>        trace@trace:~/cc$ sudo lttng create instrument
>        Session instrument created.
>        Traces will be output to
> /root/lttng-traces/instrument-20200623-222917
>
>        trace@trace:~/cc$ sudo lttng enable-channel user_func_trace
> --userspace
>        UST channel user_func_trace enabled for session instrument
>
>        trace@trace:~/cc$ sudo lttng enable-event --userspace
> lttng_ust_cyg_profile:func_entry --channel user_func_trace
>        UST event lttng_ust_cyg_profile:func_entry created in channel
> user_func_trace
>        trace@trace:~/cc$ sudo lttng enable-event --userspace
> lttng_ust_cyg_profile:func_exit --channel user_func_trace
>        UST event lttng_ust_cyg_profile:func_exit created in channel
> user_func_trace
>
>        trace@trace:~/cc$ sudo lttng start
>        Tracing started for session instrument
>
>        trace@trace:~/cc$ sudo lttng destroy
>        Destroying session instrument..
>        Session instrument destroyed
>
>        trace@trace:~/cc$ sudo babeltrace
> /root/lttng-traces/instrument-20200623-222917
>        [22:29:55.388607059] (+?.?????????) trace
> lttng_ust_cyg_profile:func_entry: { cpu_id = 2 }, { addr = 0x5625C88B01A9,
> call_site = 0x5625C88B0237 }
>        [22:29:55.388612293] (+0.000005234) trace
> lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr = 0x5625C88B01A9,
> call_site = 0x5625C88B0237 }
>        [22:29:55.388613215] (+0.000000922) trace
> lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr = 0x5625C88B01EE,
> call_site = 0x7FE40BD5C0B3 }
>
> B.R.
> Changcheng
> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
>
> https://protect2.fireeye.com/v1/url?k=98478753-c6e73d3d-9847c7c8-869a14f4b08c-41638b2508ab85dd&q=1&e=703483a0-63a9-4269-ac8e-c1fc5a57edad&u=https%3A%2F%2Flists.lttng.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Flttng-dev
> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>

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Re: [lttng-dev] get function names with lttng-ust-cyg-profile

[Christophe Bédard via lttng-dev]

[-- Attachment #1.1: Type: text/plain, Size: 4419 bytes --]

Hi,

Babeltrace is doing exactly what it should as far as I know.
>

yes, but babeltrace *can* provide the information if:

* ip and vpid contexts are enabled (for userspace), e.g.

$ lttng add-context --userspace --type=ip --type=vpid

* LTTng state dump events are enabled, e.g.

$ lttng enable-event --userspace 'lttng_ust_statedump:*'


see this (from bt2 but it also applies to bt1):
https://babeltrace.org/docs/v2.0/man7/babeltrace2-filter.lttng-utils.debug-info.7/#doc-lttng-prereq

Note that the Python bindings for babeltrace don't provide/expose this
debug info.


Christophe

On Tue, 23 Jun 2020 at 11:12, Matthew Khouzam via lttng-dev <
lttng-dev@lists.lttng.org> wrote:

> Hi,
>
> You have the pointers that are traced. Babeltrace is doing exactly what it
> should as far as I know.
>
> You could use the command 'nm' to get your symbols and look them up. I am
> sure Babeltrace can do this from a python level. You could also use a GUI
> based trace viewer to get the information.
>
> Hope that helps.
> Matthew
> ------------------------------
> *From:* lttng-dev <lttng-dev-bounces@lists.lttng.org> on behalf of Liu,
> Changcheng via lttng-dev <lttng-dev@lists.lttng.org>
> *Sent:* Tuesday, June 23, 2020 10:37 AM
> *To:* lttng-dev@lists.lttng.org <lttng-dev@lists.lttng.org>
> *Cc:* changcheng.liu@intel.com <changcheng.liu@intel.com>
> *Subject:* [lttng-dev] get function names with lttng-ust-cyg-profile
>
> Hi all,
>    I'm trying to use lttng-ust-cyg-profile to trace program.
>    Does anyone know how to get function names and offset through
> lttng-ust-cyg-profile?
>
>    In below example, the babeltrace could only get the function entry/exit
> value.
>    1. Source program: instrument.c
>          1 #include <stdio.h>
>          2
>          3 int add3(int val) {
>          4         return val + 3;
>          5 }
>          6
>          7 int main(int argc, char **argv) {
>          8     int x = 4;
>          9
>         10     puts("Press Enter to continue...");
>         11     getchar();
>         12
>         13     x = add3(x);
>         14
>         15     return 0;
>         16 }
>
>    2. build source code:
>         $ gcc -g -finstrument-functions instrument.c -o instrument
>
>    3. run program:
>        $ LD_PRELOAD=/usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile.so
> ./instrument
>
>    4. start trace process:
>        trace@trace:~/cc$ sudo lttng create instrument
>        Session instrument created.
>        Traces will be output to
> /root/lttng-traces/instrument-20200623-222917
>
>        trace@trace:~/cc$ sudo lttng enable-channel user_func_trace
> --userspace
>        UST channel user_func_trace enabled for session instrument
>
>        trace@trace:~/cc$ sudo lttng enable-event --userspace
> lttng_ust_cyg_profile:func_entry --channel user_func_trace
>        UST event lttng_ust_cyg_profile:func_entry created in channel
> user_func_trace
>        trace@trace:~/cc$ sudo lttng enable-event --userspace
> lttng_ust_cyg_profile:func_exit --channel user_func_trace
>        UST event lttng_ust_cyg_profile:func_exit created in channel
> user_func_trace
>
>        trace@trace:~/cc$ sudo lttng start
>        Tracing started for session instrument
>
>        trace@trace:~/cc$ sudo lttng destroy
>        Destroying session instrument..
>        Session instrument destroyed
>
>        trace@trace:~/cc$ sudo babeltrace
> /root/lttng-traces/instrument-20200623-222917
>        [22:29:55.388607059] (+?.?????????) trace
> lttng_ust_cyg_profile:func_entry: { cpu_id = 2 }, { addr = 0x5625C88B01A9,
> call_site = 0x5625C88B0237 }
>        [22:29:55.388612293] (+0.000005234) trace
> lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr = 0x5625C88B01A9,
> call_site = 0x5625C88B0237 }
>        [22:29:55.388613215] (+0.000000922) trace
> lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr = 0x5625C88B01EE,
> call_site = 0x7FE40BD5C0B3 }
>
> B.R.
> Changcheng
> _______________________________________________
> lttng-dev mailing list
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>
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Re: get function names with lttng-ust-cyg-profile

[Liu, Changcheng via lttng-dev]

>    You could use the command 'nm' to get your symbols and look them up. I
>    am sure Babeltrace can do this from a python level. You could also use
>    a GUI based trace viewer to get the information.
      nm only shows the linked address, but the traced address are the
      loaded address in memory. So, they're different.
      For example:
      trace@trace:~/cc$ nm instrument | grep 'add3\|main'
      00000000000011a9 T add3
      00000000000011ee T main

@Christophe:
    Do you mean that babeltrace2 can help get the function name and call site offset?

B.R.
Changcheng

On 12:52 Tue 23 Jun, Christophe Bédard wrote:
>    Hi,
> 
>      Babeltrace is doing exactly what it should as far as I know.
> 
>    yes, but babeltrace can provide the information if:
>    * ip and vpid contexts are enabled (for userspace), e.g.
> 
>    $ lttng add-context --userspace --type=ip --type=vpid
> 
>    * LTTng state dump events are enabled, e.g.
> 
>    $ lttng enable-event --userspace 'lttng_ust_statedump:*'
> 
>    see this (from bt2 but it also applies to
>    bt1): [1]https://babeltrace.org/docs/v2.0/man7/babeltrace2-filter.lttng
>    -utils.debug-info.7/#doc-lttng-prereq
>    Note that the Python bindings for babeltrace don't provide/expose this
>    debug info.
>    Christophe
>    On Tue, 23 Jun 2020 at 11:12, Matthew Khouzam via lttng-dev
>    <[2]lttng-dev@lists.lttng.org> wrote:
> 
>    Hi,
>    You have the pointers that are traced. Babeltrace is doing exactly what
>    it should as far as I know.
>    You could use the command 'nm' to get your symbols and look them up. I
>    am sure Babeltrace can do this from a python level. You could also use
>    a GUI based trace viewer to get the information.
>    Hope that helps.
>    Matthew
>      __________________________________________________________________
> 
>    From: lttng-dev <[3]lttng-dev-bounces@lists.lttng.org> on behalf of
>    Liu, Changcheng via lttng-dev <[4]lttng-dev@lists.lttng.org>
>    Sent: Tuesday, June 23, 2020 10:37 AM
>    To: [5]lttng-dev@lists.lttng.org <[6]lttng-dev@lists.lttng.org>
>    Cc: [7]changcheng.liu@intel.com <[8]changcheng.liu@intel.com>
>    Subject: [lttng-dev] get function names with lttng-ust-cyg-profile
> 
>    Hi all,
>       I'm trying to use lttng-ust-cyg-profile to trace program.
>       Does anyone know how to get function names and offset through
>    lttng-ust-cyg-profile?
>       In below example, the babeltrace could only get the function
>    entry/exit value.
>       1. Source program: instrument.c
>             1 #include <stdio.h>
>             2
>             3 int add3(int val) {
>             4         return val + 3;
>             5 }
>             6
>             7 int main(int argc, char **argv) {
>             8     int x = 4;
>             9
>            10     puts("Press Enter to continue...");
>            11     getchar();
>            12
>            13     x = add3(x);
>            14
>            15     return 0;
>            16 }
>       2. build source code:
>            $ gcc -g -finstrument-functions instrument.c -o instrument
>       3. run program:
>           $
>    LD_PRELOAD=/usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile.so
>    ./instrument
>       4. start trace process:
>           trace@trace:~/cc$ sudo lttng create instrument
>           Session instrument created.
>           Traces will be output to
>    /root/lttng-traces/instrument-20200623-222917
>           trace@trace:~/cc$ sudo lttng enable-channel user_func_trace
>    --userspace
>           UST channel user_func_trace enabled for session instrument
>           trace@trace:~/cc$ sudo lttng enable-event --userspace
>    lttng_ust_cyg_profile:func_entry --channel user_func_trace
>           UST event lttng_ust_cyg_profile:func_entry created in channel
>    user_func_trace
>           trace@trace:~/cc$ sudo lttng enable-event --userspace
>    lttng_ust_cyg_profile:func_exit --channel user_func_trace
>           UST event lttng_ust_cyg_profile:func_exit created in channel
>    user_func_trace
>           trace@trace:~/cc$ sudo lttng start
>           Tracing started for session instrument
>           trace@trace:~/cc$ sudo lttng destroy
>           Destroying session instrument..
>           Session instrument destroyed
>           trace@trace:~/cc$ sudo babeltrace
>    /root/lttng-traces/instrument-20200623-222917
>           [22:29:55.388607059] (+?.?????????) trace
>    lttng_ust_cyg_profile:func_entry: { cpu_id = 2 }, { addr =
>    0x5625C88B01A9, call_site = 0x5625C88B0237 }
>           [22:29:55.388612293] (+0.000005234) trace
>    lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr =
>    0x5625C88B01A9, call_site = 0x5625C88B0237 }
>           [22:29:55.388613215] (+0.000000922) trace
>    lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr =
>    0x5625C88B01EE, call_site = 0x7FE40BD5C0B3 }
>    B.R.
>    Changcheng
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Re: [lttng-dev] get function names with lttng-ust-cyg-profile

[Liu, Changcheng via lttng-dev]

>    You could use the command 'nm' to get your symbols and look them up. I
>    am sure Babeltrace can do this from a python level. You could also use
>    a GUI based trace viewer to get the information.
      nm only shows the linked address, but the traced address are the
      loaded address in memory. So, they're different.
      For example:
      trace@trace:~/cc$ nm instrument | grep 'add3\|main'
      00000000000011a9 T add3
      00000000000011ee T main

@Christophe:
    Do you mean that babeltrace2 can help get the function name and call site offset?

B.R.
Changcheng

On 12:52 Tue 23 Jun, Christophe Bédard wrote:
>    Hi,
> 
>      Babeltrace is doing exactly what it should as far as I know.
> 
>    yes, but babeltrace can provide the information if:
>    * ip and vpid contexts are enabled (for userspace), e.g.
> 
>    $ lttng add-context --userspace --type=ip --type=vpid
> 
>    * LTTng state dump events are enabled, e.g.
> 
>    $ lttng enable-event --userspace 'lttng_ust_statedump:*'
> 
>    see this (from bt2 but it also applies to
>    bt1): [1]https://babeltrace.org/docs/v2.0/man7/babeltrace2-filter.lttng
>    -utils.debug-info.7/#doc-lttng-prereq
>    Note that the Python bindings for babeltrace don't provide/expose this
>    debug info.
>    Christophe
>    On Tue, 23 Jun 2020 at 11:12, Matthew Khouzam via lttng-dev
>    <[2]lttng-dev@lists.lttng.org> wrote:
> 
>    Hi,
>    You have the pointers that are traced. Babeltrace is doing exactly what
>    it should as far as I know.
>    You could use the command 'nm' to get your symbols and look them up. I
>    am sure Babeltrace can do this from a python level. You could also use
>    a GUI based trace viewer to get the information.
>    Hope that helps.
>    Matthew
>      __________________________________________________________________
> 
>    From: lttng-dev <[3]lttng-dev-bounces@lists.lttng.org> on behalf of
>    Liu, Changcheng via lttng-dev <[4]lttng-dev@lists.lttng.org>
>    Sent: Tuesday, June 23, 2020 10:37 AM
>    To: [5]lttng-dev@lists.lttng.org <[6]lttng-dev@lists.lttng.org>
>    Cc: [7]changcheng.liu@intel.com <[8]changcheng.liu@intel.com>
>    Subject: [lttng-dev] get function names with lttng-ust-cyg-profile
> 
>    Hi all,
>       I'm trying to use lttng-ust-cyg-profile to trace program.
>       Does anyone know how to get function names and offset through
>    lttng-ust-cyg-profile?
>       In below example, the babeltrace could only get the function
>    entry/exit value.
>       1. Source program: instrument.c
>             1 #include <stdio.h>
>             2
>             3 int add3(int val) {
>             4         return val + 3;
>             5 }
>             6
>             7 int main(int argc, char **argv) {
>             8     int x = 4;
>             9
>            10     puts("Press Enter to continue...");
>            11     getchar();
>            12
>            13     x = add3(x);
>            14
>            15     return 0;
>            16 }
>       2. build source code:
>            $ gcc -g -finstrument-functions instrument.c -o instrument
>       3. run program:
>           $
>    LD_PRELOAD=/usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile.so
>    ./instrument
>       4. start trace process:
>           trace@trace:~/cc$ sudo lttng create instrument
>           Session instrument created.
>           Traces will be output to
>    /root/lttng-traces/instrument-20200623-222917
>           trace@trace:~/cc$ sudo lttng enable-channel user_func_trace
>    --userspace
>           UST channel user_func_trace enabled for session instrument
>           trace@trace:~/cc$ sudo lttng enable-event --userspace
>    lttng_ust_cyg_profile:func_entry --channel user_func_trace
>           UST event lttng_ust_cyg_profile:func_entry created in channel
>    user_func_trace
>           trace@trace:~/cc$ sudo lttng enable-event --userspace
>    lttng_ust_cyg_profile:func_exit --channel user_func_trace
>           UST event lttng_ust_cyg_profile:func_exit created in channel
>    user_func_trace
>           trace@trace:~/cc$ sudo lttng start
>           Tracing started for session instrument
>           trace@trace:~/cc$ sudo lttng destroy
>           Destroying session instrument..
>           Session instrument destroyed
>           trace@trace:~/cc$ sudo babeltrace
>    /root/lttng-traces/instrument-20200623-222917
>           [22:29:55.388607059] (+?.?????????) trace
>    lttng_ust_cyg_profile:func_entry: { cpu_id = 2 }, { addr =
>    0x5625C88B01A9, call_site = 0x5625C88B0237 }
>           [22:29:55.388612293] (+0.000005234) trace
>    lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr =
>    0x5625C88B01A9, call_site = 0x5625C88B0237 }
>           [22:29:55.388613215] (+0.000000922) trace
>    lttng_ust_cyg_profile:func_exit: { cpu_id = 2 }, { addr =
>    0x5625C88B01EE, call_site = 0x7FE40BD5C0B3 }
>    B.R.
>    Changcheng
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Re: get function names with lttng-ust-cyg-profile

[Liu, Changcheng via lttng-dev]

On 12:52 Tue 23 Jun, Christophe Bédard wrote:
>    Hi,
> 
>      Babeltrace is doing exactly what it should as far as I know.
> 
>    yes, but babeltrace can provide the information if:
>    * ip and vpid contexts are enabled (for userspace), e.g.
> 
>    $ lttng add-context --userspace --type=ip --type=vpid
> 
>    * LTTng state dump events are enabled, e.g.
> 
>    $ lttng enable-event --userspace 'lttng_ust_statedump:*'
Thanks Christophe. I works now that the function entry name could be got
after 1) add ip&vpid context 2) enable state dump

Do you know how to print the call site function_name/offset?
For example:
            11     getchar();
            12
            13     x = add3(x);
Currently, it only shows call_site address instead of function name with offset.

func_entry: { cpu_id = 2 }, { ip = 0x55CFA4F5C1EE, debug_info = { bin = "instrument+0x11ee", func = "main+0", src = "instrument.c:7" }, vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site = 0x7F27C4B1E0B3 }
func_entry: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = { bin = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3" }, vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site = 0x55CFA4F5C237 }
func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = { bin = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3" }, vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site = 0x55CFA4F5C237 }
func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1EE, debug_info = { bin = "instrument+0x11ee", func = "main+0", src = "instrument.c:7" }, vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site = 0x7F27C4B1E0B3 }

B.R.
Changcheng
> 
>    see this (from bt2 but it also applies to
>    bt1): [1]https://babeltrace.org/docs/v2.0/man7/babeltrace2-filter.lttng
>    -utils.debug-info.7/#doc-lttng-prereq
>    Note that the Python bindings for babeltrace don't provide/expose this
>    debug info.
>    Christophe
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Re: [lttng-dev] get function names with lttng-ust-cyg-profile

[Liu, Changcheng via lttng-dev]

On 12:52 Tue 23 Jun, Christophe Bédard wrote:
>    Hi,
> 
>      Babeltrace is doing exactly what it should as far as I know.
> 
>    yes, but babeltrace can provide the information if:
>    * ip and vpid contexts are enabled (for userspace), e.g.
> 
>    $ lttng add-context --userspace --type=ip --type=vpid
> 
>    * LTTng state dump events are enabled, e.g.
> 
>    $ lttng enable-event --userspace 'lttng_ust_statedump:*'
Thanks Christophe. I works now that the function entry name could be got
after 1) add ip&vpid context 2) enable state dump

Do you know how to print the call site function_name/offset?
For example:
            11     getchar();
            12
            13     x = add3(x);
Currently, it only shows call_site address instead of function name with offset.

func_entry: { cpu_id = 2 }, { ip = 0x55CFA4F5C1EE, debug_info = { bin = "instrument+0x11ee", func = "main+0", src = "instrument.c:7" }, vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site = 0x7F27C4B1E0B3 }
func_entry: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = { bin = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3" }, vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site = 0x55CFA4F5C237 }
func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = { bin = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3" }, vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site = 0x55CFA4F5C237 }
func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1EE, debug_info = { bin = "instrument+0x11ee", func = "main+0", src = "instrument.c:7" }, vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site = 0x7F27C4B1E0B3 }

B.R.
Changcheng
> 
>    see this (from bt2 but it also applies to
>    bt1): [1]https://babeltrace.org/docs/v2.0/man7/babeltrace2-filter.lttng
>    -utils.debug-info.7/#doc-lttng-prereq
>    Note that the Python bindings for babeltrace don't provide/expose this
>    debug info.
>    Christophe
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Re: get function names with lttng-ust-cyg-profile

[Christophe Bédard via lttng-dev]

[-- Attachment #1.1: Type: text/plain, Size: 1412 bytes --]

Hi,

On Tue, 23 Jun 2020 at 21:45, Liu, Changcheng <changcheng.liu@intel.com>
wrote:

> Do you know how to print the call site function_name/offset?
> For example:
>             11     getchar();
>             12
>             13     x = add3(x);
> Currently, it only shows call_site address instead of function name with
> offset.
>
> func_entry: { cpu_id = 2 }, { ip = 0x55CFA4F5C1EE, debug_info = { bin =
> "instrument+0x11ee", func = "main+0", src = "instrument.c:7" }, vpid = 8523
> }, { addr = 0x55CFA4F5C1EE, call_site = 0x7F27C4B1E0B3 }
> func_entry: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = { bin =
> "instrument+0x11a9", func = "add3+0", src = "instrument.c:3" }, vpid = 8523
> }, { addr = 0x55CFA4F5C1A9, call_site = 0x55CFA4F5C237 }
> func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = { bin =
> "instrument+0x11a9", func = "add3+0", src = "instrument.c:3" }, vpid = 8523
> }, { addr = 0x55CFA4F5C1A9, call_site = 0x55CFA4F5C237 }
> func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1EE, debug_info = { bin =
> "instrument+0x11ee", func = "main+0", src = "instrument.c:7" }, vpid = 8523
> }, { addr = 0x55CFA4F5C1EE, call_site = 0x7F27C4B1E0B3 }
>

 Maybe I'm missing something, but isn't it right here? E.g.

debug_info = { bin = "instrument+0x11ee", func = "main+0", src =
> "instrument.c:7" }
>

Otherwise, I don't think babeltrace can provide any more information.


Christophe

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Re: [lttng-dev] get function names with lttng-ust-cyg-profile

[Christophe Bédard via lttng-dev]

[-- Attachment #1.1: Type: text/plain, Size: 1412 bytes --]

Hi,

On Tue, 23 Jun 2020 at 21:45, Liu, Changcheng <changcheng.liu@intel.com>
wrote:

> Do you know how to print the call site function_name/offset?
> For example:
>             11     getchar();
>             12
>             13     x = add3(x);
> Currently, it only shows call_site address instead of function name with
> offset.
>
> func_entry: { cpu_id = 2 }, { ip = 0x55CFA4F5C1EE, debug_info = { bin =
> "instrument+0x11ee", func = "main+0", src = "instrument.c:7" }, vpid = 8523
> }, { addr = 0x55CFA4F5C1EE, call_site = 0x7F27C4B1E0B3 }
> func_entry: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = { bin =
> "instrument+0x11a9", func = "add3+0", src = "instrument.c:3" }, vpid = 8523
> }, { addr = 0x55CFA4F5C1A9, call_site = 0x55CFA4F5C237 }
> func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = { bin =
> "instrument+0x11a9", func = "add3+0", src = "instrument.c:3" }, vpid = 8523
> }, { addr = 0x55CFA4F5C1A9, call_site = 0x55CFA4F5C237 }
> func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1EE, debug_info = { bin =
> "instrument+0x11ee", func = "main+0", src = "instrument.c:7" }, vpid = 8523
> }, { addr = 0x55CFA4F5C1EE, call_site = 0x7F27C4B1E0B3 }
>

 Maybe I'm missing something, but isn't it right here? E.g.

debug_info = { bin = "instrument+0x11ee", func = "main+0", src =
> "instrument.c:7" }
>

Otherwise, I don't think babeltrace can provide any more information.


Christophe

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Re: get function names with lttng-ust-cyg-profile

[Liu, Changcheng via lttng-dev]

On 10:19 Fri 26 Jun, Christophe Bédard wrote:
>    Hi,
>    On Tue, 23 Jun 2020 at 21:45, Liu, Changcheng
>    <[1]changcheng.liu@intel.com> wrote:
> 
>      Do you know how to print the call site function_name/offset?
>      For example:
>                  11     getchar();
>                  12
>                  13     x = add3(x);
>      Currently, it only shows call_site address instead of function name
>      with offset.
>      func_entry: { cpu_id = 2 }, { ip = 0x55CFA4F5C1EE, debug_info = {
>      bin = "instrument+0x11ee", func = "main+0", src = "instrument.c:7"
>      }, vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site =
>      0x7F27C4B1E0B3 }
>      func_entry: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = {
>      bin = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3"
>      }, vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site =
>      0x55CFA4F5C237 }
>      func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = { bin
>      = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3" },
>      vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site = 0x55CFA4F5C237 }
>      func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1EE, debug_info = { bin
>      = "instrument+0x11ee", func = "main+0", src = "instrument.c:7" },
>      vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site = 0x7F27C4B1E0B3 }
> 
>     Maybe I'm missing something, but isn't it right here? E.g.
      I'm also curious about the output here. "main+0" the function name
      "main" is right, but the offset "+0" isn't right.
      I've run it for several times, it always shows like the above
      output.
      So, two questions here:
      1. How to show the rigth offset?
      2. How to show call_site in "func/offset" format?
> 
>      debug_info = { bin = "instrument+0x11ee", func = "main+0", src =
>      "instrument.c:7" }
> 
>    Otherwise, I don't think babeltrace can provide any more information.
>    Christophe
> 
> References
> 
>    1. mailto:changcheng.liu@intel.com
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Re: [lttng-dev] get function names with lttng-ust-cyg-profile

[Liu, Changcheng via lttng-dev]

On 10:19 Fri 26 Jun, Christophe Bédard wrote:
>    Hi,
>    On Tue, 23 Jun 2020 at 21:45, Liu, Changcheng
>    <[1]changcheng.liu@intel.com> wrote:
> 
>      Do you know how to print the call site function_name/offset?
>      For example:
>                  11     getchar();
>                  12
>                  13     x = add3(x);
>      Currently, it only shows call_site address instead of function name
>      with offset.
>      func_entry: { cpu_id = 2 }, { ip = 0x55CFA4F5C1EE, debug_info = {
>      bin = "instrument+0x11ee", func = "main+0", src = "instrument.c:7"
>      }, vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site =
>      0x7F27C4B1E0B3 }
>      func_entry: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = {
>      bin = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3"
>      }, vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site =
>      0x55CFA4F5C237 }
>      func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = { bin
>      = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3" },
>      vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site = 0x55CFA4F5C237 }
>      func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1EE, debug_info = { bin
>      = "instrument+0x11ee", func = "main+0", src = "instrument.c:7" },
>      vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site = 0x7F27C4B1E0B3 }
> 
>     Maybe I'm missing something, but isn't it right here? E.g.
      I'm also curious about the output here. "main+0" the function name
      "main" is right, but the offset "+0" isn't right.
      I've run it for several times, it always shows like the above
      output.
      So, two questions here:
      1. How to show the rigth offset?
      2. How to show call_site in "func/offset" format?
> 
>      debug_info = { bin = "instrument+0x11ee", func = "main+0", src =
>      "instrument.c:7" }
> 
>    Otherwise, I don't think babeltrace can provide any more information.
>    Christophe
> 
> References
> 
>    1. mailto:changcheng.liu@intel.com
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Re: get function names with lttng-ust-cyg-profile

[Liu, Changcheng via lttng-dev]

Hi Christophe,
    I've checked lots of examples about func_entry/exit. It seems all
    the address are the linked address. However, my result shows that
    they're the loaded running address.

    Do you have some suggestions to check it further?

B.R.
Changcheng

On 22:22 Fri 26 Jun, Liu, Changcheng wrote:
> On 10:19 Fri 26 Jun, Christophe Bédard wrote:
> >    Hi,
> >    On Tue, 23 Jun 2020 at 21:45, Liu, Changcheng
> >    <[1]changcheng.liu@intel.com> wrote:
> > 
> >      Do you know how to print the call site function_name/offset?
> >      For example:
> >                  11     getchar();
> >                  12
> >                  13     x = add3(x);
> >      Currently, it only shows call_site address instead of function name
> >      with offset.
> >      func_entry: { cpu_id = 2 }, { ip = 0x55CFA4F5C1EE, debug_info = {
> >      bin = "instrument+0x11ee", func = "main+0", src = "instrument.c:7"
> >      }, vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site =
> >      0x7F27C4B1E0B3 }
> >      func_entry: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = {
> >      bin = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3"
> >      }, vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site =
> >      0x55CFA4F5C237 }
> >      func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = { bin
> >      = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3" },
> >      vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site = 0x55CFA4F5C237 }
> >      func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1EE, debug_info = { bin
> >      = "instrument+0x11ee", func = "main+0", src = "instrument.c:7" },
> >      vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site = 0x7F27C4B1E0B3 }
> > 
> >     Maybe I'm missing something, but isn't it right here? E.g.
>       I'm also curious about the output here. "main+0" the function name
>       "main" is right, but the offset "+0" isn't right.
>       I've run it for several times, it always shows like the above
>       output.
>       So, two questions here:
>       1. How to show the rigth offset?
>       2. How to show call_site in "func/offset" format?
> > 
> >      debug_info = { bin = "instrument+0x11ee", func = "main+0", src =
> >      "instrument.c:7" }
> > 
> >    Otherwise, I don't think babeltrace can provide any more information.
> >    Christophe
> > 
> > References
> > 
> >    1. mailto:changcheng.liu@intel.com
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Re: [lttng-dev] get function names with lttng-ust-cyg-profile

[Liu, Changcheng via lttng-dev]

Hi Christophe,
    I've checked lots of examples about func_entry/exit. It seems all
    the address are the linked address. However, my result shows that
    they're the loaded running address.

    Do you have some suggestions to check it further?

B.R.
Changcheng

On 22:22 Fri 26 Jun, Liu, Changcheng wrote:
> On 10:19 Fri 26 Jun, Christophe Bédard wrote:
> >    Hi,
> >    On Tue, 23 Jun 2020 at 21:45, Liu, Changcheng
> >    <[1]changcheng.liu@intel.com> wrote:
> > 
> >      Do you know how to print the call site function_name/offset?
> >      For example:
> >                  11     getchar();
> >                  12
> >                  13     x = add3(x);
> >      Currently, it only shows call_site address instead of function name
> >      with offset.
> >      func_entry: { cpu_id = 2 }, { ip = 0x55CFA4F5C1EE, debug_info = {
> >      bin = "instrument+0x11ee", func = "main+0", src = "instrument.c:7"
> >      }, vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site =
> >      0x7F27C4B1E0B3 }
> >      func_entry: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = {
> >      bin = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3"
> >      }, vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site =
> >      0x55CFA4F5C237 }
> >      func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = { bin
> >      = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3" },
> >      vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site = 0x55CFA4F5C237 }
> >      func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1EE, debug_info = { bin
> >      = "instrument+0x11ee", func = "main+0", src = "instrument.c:7" },
> >      vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site = 0x7F27C4B1E0B3 }
> > 
> >     Maybe I'm missing something, but isn't it right here? E.g.
>       I'm also curious about the output here. "main+0" the function name
>       "main" is right, but the offset "+0" isn't right.
>       I've run it for several times, it always shows like the above
>       output.
>       So, two questions here:
>       1. How to show the rigth offset?
>       2. How to show call_site in "func/offset" format?
> > 
> >      debug_info = { bin = "instrument+0x11ee", func = "main+0", src =
> >      "instrument.c:7" }
> > 
> >    Otherwise, I don't think babeltrace can provide any more information.
> >    Christophe
> > 
> > References
> > 
> >    1. mailto:changcheng.liu@intel.com
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