def test_tracing_bootstrap(self): workq_event_path = FT_EVENT_DIR + "workqueue/enable" permitted_files = {workq_event_path: "0", FT_TRACE: "x"} io_interface = make_test_io_interface(permitted_files) systrace_cmd = SYSTRACE_HOST_CMD_DEFAULT + ["workq"] options, categories = run_systrace.parse_options(systrace_cmd) agent = ftrace_agent.FtraceAgent(io_interface) self.assertEqual(['workq'], agent._avail_categories()) # confirm tracing is enabled, buffer is cleared agent.StartAgentTracing(options, categories, 10) self.assertEqual(permitted_files[FT_TRACE_ON], "1") self.assertEqual(permitted_files[FT_TRACE], "") # fill in file with dummy contents dummy_trace = "trace_contents" permitted_files[FT_TRACE] = dummy_trace # confirm tracing is disabled agent.StopAgentTracing(10) agent.GetResults(30) self.assertEqual(permitted_files[FT_TRACE_ON], "0") # confirm trace is expected, and read from fs self.assertEqual(agent.GetResults(30).raw_data, dummy_trace) # confirm buffer size is reset to 1 self.assertEqual(permitted_files[FT_BUFFER_SIZE], "1")
def test_buffer_size(self): systrace_cmd = SYSTRACE_HOST_CMD_DEFAULT + ['-b', '16000'] options, categories = run_systrace.parse_options(systrace_cmd) agent = ftrace_agent.FtraceAgent() agent._options = options agent._categories = categories self.assertEqual(agent._get_trace_buffer_size(), 16000)
def test_avail_categories(self): # sched only has required events permitted_files = { FT_EVENT_DIR + "sched/sched_switch/enable": "0", FT_EVENT_DIR + "sched/sched_wakeup/enable": "0" } io_interface = make_test_io_interface(permitted_files) agent = ftrace_agent.FtraceAgent(io_interface) self.assertEqual(['sched'], agent._avail_categories()) # check for no available categories permitted_files = {} io_interface = make_test_io_interface(permitted_files) agent = ftrace_agent.FtraceAgent(io_interface) self.assertEqual([], agent._avail_categories()) # block has some required, some optional events permitted_files = { FT_EVENT_DIR + "block/block_rq_complete/enable": "0", FT_EVENT_DIR + "block/block_rq_issue/enable": "0" } io_interface = make_test_io_interface(permitted_files) agent = ftrace_agent.FtraceAgent(io_interface) self.assertEqual(['disk'], agent._avail_categories())
def test_tracing_event_enable_disable(self): # turn on irq tracing ipi_event_path = FT_EVENT_DIR + "ipi/enable" irq_event_path = FT_EVENT_DIR + "irq/enable" permitted_files = {ipi_event_path: "0", irq_event_path: "0"} io_interface = make_test_io_interface(permitted_files) systrace_cmd = SYSTRACE_HOST_CMD_DEFAULT + ["irq"] options, categories = run_systrace.parse_options(systrace_cmd) agent = ftrace_agent.FtraceAgent(io_interface) self.assertEqual(['irq'], agent._avail_categories()) # confirm all the event nodes are turned on during tracing agent.StartAgentTracing(options, categories, 10) self.assertEqual(permitted_files[irq_event_path], "1") self.assertEqual(permitted_files[ipi_event_path], "1") # and then turned off when completed. agent.StopAgentTracing(10) agent.GetResults(30) self.assertEqual(permitted_files[irq_event_path], "0") self.assertEqual(permitted_files[ipi_event_path], "0")