kernel: Update CPU runtime stats of non-idle time

peter-mitsis · nashif · commit 11f8f6697fb5 · 2022-01-20T08:22:01.000-05:00
Updates sched_cpu_update_usage() such that the CPU runtime stats
only update the its non-idle time when the current thread is not the
idle thread. This is necessary as otherwise the CPUs idle-time will
be double counted in k_thread_runtime_stats.execution_cycles.

Signed-off-by: Peter Mitsis &lt;peter.mitsis@intel.com&gt;
diff --git a/kernel/usage.c b/kernel/usage.c
@@ -47,7 +47,9 @@ static void sched_cpu_update_usage(struct _cpu *cpu, uint32_t cycles)
 	}
 #endif
 
-	cpu->usage.total += cycles;
+	if (cpu->current != cpu->idle_thread) {
+		cpu->usage.total += cycles;
+	}
 }
 #else
 #define sched_cpu_update_usage(cpu, cycles)   do { } while (0)

Original file line number	Diff line number	Diff line change
`@@ -47,7 +47,9 @@ static void sched_cpu_update_usage(struct _cpu *cpu, uint32_t cycles)`
`47`	`47`	`}`
`48`	`48`	`#endif`
`49`	`49`
`50`		`- cpu->usage.total += cycles;`
	`50`	`+ if (cpu->current != cpu->idle_thread) {`
	`51`	`+ cpu->usage.total += cycles;`
	`52`	`+ }`
`51`	`53`	`}`
`52`	`54`	`#else`
`53`	`55`	`#define sched_cpu_update_usage(cpu, cycles) do { } while (0)`