Log cpu usage periodically

rpcs3/Emu/perf_monitor.cpp

@@ -0,0 +1,50 @@
+#include "stdafx.h"
+#include "perf_monitor.hpp"
+#include "util/cpu_stats.hpp"
+#include "Utilities/Thread.h"
+
+LOG_CHANNEL(sys_log, "SYS");
+
+void perf_monitor::operator()()
+{
+	constexpr u64 update_interval_us = 1000000; // Update every second
+	constexpr u64 log_interval_us = 10000000;   // Log every 10 seconds
+	u64 elapsed_us = 0;
+
+	utils::cpu_stats stats;
+	stats.init_cpu_query();
+
+	while (thread_ctrl::state() != thread_state::aborting)
+	{
+		thread_ctrl::wait_for(update_interval_us);
+		elapsed_us += update_interval_us;
+
+		double total_usage = 0.0;
+		std::vector<double> per_core_usage;
+
+		stats.get_per_core_usage(per_core_usage, total_usage);
+
+		if (elapsed_us >= log_interval_us)
+		{
+			elapsed_us = 0;
+
+			std::string msg = fmt::format("CPU Usage: Total: %.1f%%", total_usage);
+
+			if (!per_core_usage.empty())
+			{
+				fmt::append(msg, ", Cores:");
+			}
+
+			for (size_t i = 0; i < per_core_usage.size(); i++)
+			{
+				fmt::append(msg, "%s %.1f%%", i > 0 ? "," : "", per_core_usage[i]);
+			}
+
+			sys_log.notice("%s", msg);
+		}
+	}
+}
+
+perf_monitor::~perf_monitor()
+{
+}