jlaitine opened a new pull request, #16483:
URL: https://github.com/apache/nuttx/pull/16483
## Summary
I recently tested segger sysview on MPFS platform, and found out some issues
with the driver.
This is a collection of patches which I made in order to make it usable for
my purpose, including:
- Compilation errors with -Werr
- In SMP, the driver deadlocks due to entering spinlock recursively. Changed
this to critical section, didn't see much performance degredation with that
- up_perf_gettime was assumed to be always nanosecods, this is not true, but
segger driver can scale the timestamps correctly. Just need to configure the
frequency
- added support to configure "post-mortem" mode, which essentially traces
continuously to a circular buffer until the tracing is stopped
## Impact
Impacts only using Segger System View tool to profile a running system
## Testing
Tested on MPFS platform, by configuring
CONFIG_SCHED_INSTRUMENTATION=y
CONFIG_SCHED_INSTRUMENTATION_FILTER=y
CONFIG_SCHED_INSTRUMENTATION_IRQHANDLER=y
CONFIG_SCHED_INSTRUMENTATION_SWITCH=y
CONFIG_SEGGER_SYSVIEW=y
CONFIG_SEGGER_SYSVIEW_RTT_BUFFER_SIZE=155648
CONFIG_SEGGER_SYSVIEW_POST_MORTEM=y
Dumping the buffer memory with JTAG and loading it to SystemView tool. On
MPFS, the systemview tool can't directly connect to the target for some reason.
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