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tracing: introduce ram tracing snippet

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This allows tracing any application and stores the data in RAM. Using
gdb, the ram_tracing variable contents can then be saved and viewed
using babeltrace.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
This commit is contained in:
Anas Nashif 2025-07-07 12:26:36 -04:00 committed by Benjamin Cabé
parent a096b34835
commit d54d69b59b
3 changed files with 85 additions and 0 deletions
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67
snippets/ram-tracing/README.rst Normal file
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.. _snippet-ram-tracing:
RAM Tracing Snippet (ram-tracing)
#################################
.. code-block:: console
west build -S ram-tracing [...]
Overview
********
This snippet enables CTF Tracing using the RAM backend.
After connecting to the target in GDB, you can dump the RAM tracing data to a
binary file:
.. code-block:: console
(gdb) dump binary memory ram_tracing.bin ram_tracing ram_tracing+8192
Using `Babeltrace`_, you can view the binary file as a CTF trace:
.. code-block:: console
[19:00:00.023530800] (+?.?????????) thread_create: { thread_id = 2147621216, name = "unknown" }
[19:00:00.023567100] (+0.000036300) thread_info: { thread_id = 2147621216, name = "unknown", stack_base = 2147705856, stack_size = 3072 }
[19:00:00.023673700] (+0.000106600) thread_name_set: { thread_id = 2147621216, name = "test_abort_from_isr" }
[19:00:00.023731100] (+0.000057400) thread_wakeup: { thread_id = 2147621216, name = "test_abort_from_isr" }
[19:00:00.023827500] (+0.000096400) thread_switched_out: { thread_id = 2147621968, name = "main" }
[19:00:00.023904500] (+0.000077000) thread_switched_in: { thread_id = 2147621216, name = "test_abort_from_isr" }
[19:00:00.024807600] (+0.000903100) thread_create: { thread_id = 2147619320, name = "unknown" }
[19:00:00.024843800] (+0.000036200) thread_info: { thread_id = 2147619320, name = "unknown", stack_base = 2147693568, stack_size = 3072 }
[19:00:00.024898700] (+0.000054900) thread_wakeup: { thread_id = 2147619320, name = "unknown" }
[19:00:00.025020000] (+0.000121300) thread_switched_out: { thread_id = 2147621216, name = "test_abort_from_isr" }
[19:00:00.025130700] (+0.000110700) thread_switched_in: { thread_id = 2147621968, name = "main" }
[19:00:00.025249900] (+0.000119200) thread_switched_out: { thread_id = 2147621968, name = "main" }
[19:00:00.025353500] (+0.000103600) thread_switched_in: { thread_id = 2147619320, name = "unknown" }
[19:00:00.026049900] (+0.000696400) thread_switched_in: { thread_id = 2147621216, name = "test_abort_from_isr" }
[19:00:00.026759200] (+0.000709300) semaphore_give_enter: { id = 2147735664 }
[19:00:00.026773600] (+0.000014400) semaphore_give_exit: { id = 2147735664 }
[19:00:00.027346600] (+0.000573000) thread_switched_out: { thread_id = 2147621216, name = "test_abort_from_isr" }
[19:00:00.027457400] (+0.000110800) thread_switched_in: { thread_id = 2147621968, name = "main" }
[19:00:00.029552800] (+0.002095400) thread_create: { thread_id = 2147621216, name = "unknown" }
[19:00:00.029589000] (+0.000036200) thread_info: { thread_id = 2147621216, name = "unknown", stack_base = 2147705856, stack_size = 3072 }
[19:00:00.029697400] (+0.000108400) thread_name_set: { thread_id = 2147621216, name = "test_abort_from_isr" }
[19:00:00.029754800] (+0.000057400) thread_wakeup: { thread_id = 2147621216, name = "test_abort_from_isr" }
[19:00:00.029851200] (+0.000096400) thread_switched_out: { thread_id = 2147621968, name = "main" }
[19:00:00.029928200] (+0.000077000) thread_switched_in: { thread_id = 2147621216, name = "test_abort_from_isr" }
[19:00:00.029968400] (+0.000040200) semaphore_init: { id = 2147623436, ret = 0 }
[19:00:00.030851900] (+0.000883500) thread_create: { thread_id = 2147619320, name = "unknown" }
[19:00:00.030888100] (+0.000036200) thread_info: { thread_id = 2147619320, name = "unknown", stack_base = 2147693568, stack_size = 3072 }
[19:00:00.030943000] (+0.000054900) thread_wakeup: { thread_id = 2147619320, name = "unknown" }
[19:00:00.030989600] (+0.000046600) semaphore_take_enter: { id = 2147623436, timeout = 4294957296 }
[19:00:00.031005800] (+0.000016200) semaphore_take_blocking: { id = 2147623436, timeout = 4294957296 }
[19:00:00.031099600] (+0.000093800) thread_switched_out: { thread_id = 2147621216, name = "test_abort_from_isr" }
[19:00:00.031210300] (+0.000110700) thread_switched_in: { thread_id = 2147621968, name = "main" }
[19:00:00.031329500] (+0.000119200) thread_switched_out: { thread_id = 2147621968, name = "main" }
[19:00:00.031433100] (+0.000103600) thread_switched_in: { thread_id = 2147619320, name = "unknown" }
[19:00:00.031469100] (+0.000036000) semaphore_give_enter: { id = 2147623436 }
References
**********
.. target-notes::
.. _Babeltrace: https://babeltrace.org/

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# Copyright Zephyr Project Contributors
# SPDX-License-Identifier: Apache-2.0
CONFIG_DEBUG_OPTIMIZATIONS=n
CONFIG_DEBUG_THREAD_INFO=y
CONFIG_TRACING=y
CONFIG_TRACING_CTF=y
CONFIG_TRACING_BACKEND_RAM=y
CONFIG_RAM_TRACING_BUFFER_SIZE=8192
CONFIG_TRACING_SYNC=y

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snippets/ram-tracing/snippet.yml Normal file
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# Copyright Zephyr Project Contributors
# SPDX-License-Identifier: Apache-2.0
name: ram-tracing
append:
EXTRA_CONF_FILE: ram-tracing.conf