Merge "Check if CPU time tracking is expected to work" (bd18538f) · Commits · e / os / android_frameworks_native

libs/cputimeinstate/cputimeinstate.cpp

+17 −2

Original line number	Diff line number	Diff line
		@@ -155,10 +155,14 @@ static bool initGlobals() {
		return true;
		}

		static bool attachTracepointProgram(const std::string &eventType, const std::string &eventName) {
		static int retrieveProgramFd(const std::string &eventType, const std::string &eventName) {
		std::string path = StringPrintf(BPF_FS_PATH "prog_time_in_state_tracepoint_%s_%s",
		eventType.c_str(), eventName.c_str());
		int prog_fd = retrieveProgram(path.c_str());
		return retrieveProgram(path.c_str());
		}

		static bool attachTracepointProgram(const std::string &eventType, const std::string &eventName) {
		int prog_fd = retrieveProgramFd(eventType, eventName);
		if (prog_fd < 0) return false;
		return bpf_attach_tracepoint(prog_fd, eventType.c_str(), eventName.c_str()) >= 0;
		}
		@@ -174,6 +178,17 @@ static std::optional<uint32_t> getPolicyFreqIdx(uint32_t policy) {
		return {};
		}

		// Check if tracking is expected to work without activating it.
		bool isTrackingUidTimesSupported() {
		auto freqs = getCpuFreqs();
		if (!freqs \|\| freqs->empty()) return false;
		if (gTracking) return true;
		if (retrieveProgramFd("sched", "sched_switch") < 0) return false;
		if (retrieveProgramFd("power", "cpu_frequency") < 0) return false;
		if (retrieveProgramFd("sched", "sched_process_free") < 0) return false;
		return true;
		}

		// Start tracking and aggregating data to be reported by getUidCpuFreqTimes and getUidsCpuFreqTimes.
		// Returns true on success, false otherwise.
		// Tracking is active only once a live process has successfully called this function; if the calling

libs/cputimeinstate/cputimeinstate.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -22,6 +22,7 @@
		namespace android {
		namespace bpf {

		bool isTrackingUidTimesSupported();
		bool startTrackingUidTimes();
		std::optional<std::vector<std::vector<uint64_t>>> getTotalCpuFreqTimes();
		std::optional<std::vector<std::vector<uint64_t>>> getUidCpuFreqTimes(uint32_t uid);

libs/cputimeinstate/testtimeinstate.cpp

+5 −0

Original line number	Diff line number	Diff line
		@@ -40,6 +40,11 @@ static constexpr uint64_t NSEC_PER_YEAR = NSEC_PER_SEC * 60 * 60 * 24 * 365;

		using std::vector;

		TEST(TimeInStateTest, IsTrackingSupported) {
		isTrackingUidTimesSupported();
		SUCCEED();
		}

		TEST(TimeInStateTest, TotalTimeInState) {
		auto times = getTotalCpuFreqTimes();
		ASSERT_TRUE(times.has_value());