Profiler (profiler)

A hash table based profiling tool for measuring execution time and call count of code sections.

Struct

struct profiler_t {
    uint64_t begin;    /* Start timestamp (ns) */
    uint64_t end;      /* End timestamp (ns) */
    uint64_t elapsed;  /* Accumulated time (ns) */
    uint64_t count;    /* Call count */
};

API

Function	Description
profiler_begin(p)	Start timing, record current time into begin
profiler_end(p)	Stop timing, accumulate elapsed time into elapsed, count++
profiler_search(name)	Find or create a profiler with the given name
profiler_foreach(cb)	Iterate over all profilers, callback returns name, average time, call count
profiler_clear()	Clear all profiler data

Usage Example

#include <kernel/core/profiler.h>

struct profiler_t * p = profiler_search("my-function");

profiler_begin(p);
/* ... code to be measured ... */
profiler_end(p);

/* Print all profiling results */
profiler_foreach([](const char * name, uint64_t count, uint64_t time) {
    shell_printf("%s: avg=%lluns, count=%llu\n", name, time, count);
});

Notes

• Profiler names are managed via a hash table; profilers with the same name share data
• profiler_search looks up the hash table, auto-creates and initializes if not found
• profiler_begin/end are inline functions that use ktime_get() to obtain nanosecond timestamps
• profiler_foreach outputs sorted by name, time in the callback is the average time (total / count)
• profiler_clear clears the hash table, resetting all data