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")
