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Message-Id: <20241021-add-m68k-tracing-support-v1-0-0883d704525b@yoseli.org>
Date: Mon, 21 Oct 2024 11:44:41 +0200
From: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org, rostedt@...dmis.org,
Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>
Subject: [PATCH RFC 0/2] Add basic tracing support for m68k
In order to debug latency issues, I wanted to use ftrace on my M54418
coldfire. Sadly, it is not supported yet.
Thanks to Steven [1] it does not sound too difficult.
This small series adds basic functions to make it work, and for the few
tests I could do, it seems to be working well.
Here is a simple output I get:
```
bash-232 [000] d..3. 947.629000: thread_noise: bash:232 start 947.629000000 duration 0 ns
timerlat/0-274 [000] ..... 947.629000: #51598 context thread timer_latency 409280 ns
bash-232 [000] d.h.. 947.630000: #51599 context irq timer_latency 110720 ns
bash-232 [000] dnh1. 947.630000: irq_noise: timer:206 start 947.629000000 duration 1000000 ns
bash-232 [000] d..3. 947.630000: thread_noise: bash:232 start 947.630000000 duration 0 ns
timerlat/0-274 [000] ..... 947.630000: #51599 context thread timer_latency 407168 ns
bash-232 [000] d.h.. 947.631000: #51600 context irq timer_latency 108608 ns
bash-232 [000] dnh1. 947.631000: irq_noise: timer:206 start 947.630000000 duration 1000000 ns
bash-232 [000] d..3. 947.631000: thread_noise: bash:232 start 947.631000000 duration 0 ns
timerlat/0-274 [000] ..... 947.631000: #51600 context thread timer_latency 401472 ns
```
I am very interested by any relevant test to do (switch events ?
Anything else ?) to improve the series (and the platform :-)).
I am quite sure I missed a *lot* of things, but it seems to do what I
need :-). I post it as RFC for now, in particular because I added a new
file, and I am not sure if it is the proper way.
Thanks for your remarks and improvements !
[1]: https://lore.kernel.org/linux-m68k/20241018124511.70d29198@gandalf.local.home
Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>
---
Jean-Michel Hautbois (2):
m68k: Add tracirqs
arch: m68k: Add STACKTRACE support
arch/m68k/Kconfig | 6 ++++
arch/m68k/kernel/Makefile | 1 +
arch/m68k/kernel/irq.c | 2 ++
arch/m68k/kernel/stacktrace.c | 70 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 79 insertions(+)
---
base-commit: 42f7652d3eb527d03665b09edac47f85fb600924
change-id: 20241021-add-m68k-tracing-support-36c18d2233d8
Best regards,
--
Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>
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