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sched_note: add function auto-tracing #8988

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merged 1 commit into from Apr 10, 2023
Merged

sched_note: add function auto-tracing #8988

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23 changes: 23 additions & 0 deletions drivers/note/note_driver.c
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Expand Up @@ -1987,3 +1987,26 @@ int note_driver_register(FAR struct note_driver_s *driver)

return -ENOMEM;
}

#ifdef CONFIG_SCHED_INSTRUMENTATION_FUNCTION

/****************************************************************************
* Name: __cyg_profile_func_enter
****************************************************************************/

void noinstrument_function
__cyg_profile_func_enter(void *this_fn, void *call_site)
{
sched_note_string_ip(NOTE_TAG_ALWAYS, (uintptr_t)this_fn, "B");
}

/****************************************************************************
* Name: __cyg_profile_func_exit
****************************************************************************/

void noinstrument_function
__cyg_profile_func_exit(void *this_fn, void *call_site)
{
sched_note_string_ip(NOTE_TAG_ALWAYS, (uintptr_t)this_fn, "E");
}
#endif
14 changes: 14 additions & 0 deletions sched/Kconfig
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Expand Up @@ -1088,6 +1088,20 @@ config SCHED_INSTRUMENTATION_DUMP
void sched_note_printf(FAR const char *fmt, ...) printf_like(1, 2);
void sched_note_bprintf(uint32_t module, uint8_t event, FAR const char *fmt, ...);

config SCHED_INSTRUMENTATION_FUNCTION
bool "Enable function auto-tracing"
default n
---help---
After enabling this option, you can automatically trace the function instrumentation without adding tracepoint manually.
This is similar to the Function Trace effect of the linux kernel
Add CFLAGS += -finstrument-functions to the makefile to track the required modules.
The following compilation option can exclude files that do not want to be tracked in this module
CFLAGS += -finstrument-functions-exclude-file-list=xxx
The following compilation option can exclude functions that do not want to be tracked in this module
CFLAGS += -finstrument-functions-exclude-function-list=xxx
For a more detailed description of compilation options,
refer to the "Program Instrumentation Options" chapter in the gcc documentation

endif # SCHED_INSTRUMENTATION
endmenu # Performance Monitoring

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