Eric Li | e0493a4 | 2010-11-15 13:05:43 -0800 | [diff] [blame] | 1 | import os |
| 2 | from autotest_lib.client.bin import utils |
| 3 | |
| 4 | import base_tracer |
| 5 | try: |
| 6 | from site_tracers import * |
| 7 | except ImportError: |
| 8 | pass |
| 9 | |
| 10 | |
| 11 | off = base_tracer.Tracer |
| 12 | |
| 13 | |
| 14 | class ftrace(base_tracer.Tracer): |
| 15 | |
| 16 | mountpoint = '/sys/kernel/debug' |
| 17 | tracing_dir = os.path.join(mountpoint, 'tracing') |
| 18 | |
| 19 | def warmup(self, buffer_size_kb): |
| 20 | if not os.path.exists(self.tracing_dir): |
| 21 | utils.system('mount -t debugfs debugfs %s' % self.mountpoint) |
| 22 | |
| 23 | # ensure clean state: |
| 24 | self.trace_config('tracing_enabled', '0') |
| 25 | self.trace_config('current_tracer', 'nop') |
| 26 | self.trace_config('events/enable', '0') |
| 27 | self.trace_config('trace', '') |
| 28 | # set ring buffer size: |
| 29 | self.trace_config('buffer_size_kb', str(buffer_size_kb)) |
| 30 | # enable tracepoints: |
| 31 | self.trace_config('events/syscalls/sys_enter_getuid/enable', '1') |
| 32 | |
| 33 | def cleanup(self): |
| 34 | # reset ring buffer size: |
| 35 | self.trace_config('buffer_size_kb', '1408') |
| 36 | # disable tracepoints: |
| 37 | self.trace_config('events/enable', '0') |
| 38 | |
| 39 | def start_tracing(self): |
| 40 | self.trace_config('tracing_enabled', '1') |
| 41 | |
| 42 | def stop_tracing(self): |
| 43 | self.trace_config('tracing_enabled', '0') |
| 44 | |
| 45 | def reset_tracing(self): |
| 46 | self.trace_config('trace', '') |
| 47 | |
| 48 | def gather_stats(self, results): |
| 49 | per_cpu = os.path.join(self.tracing_dir, 'per_cpu') |
| 50 | for cpu in os.listdir(per_cpu): |
| 51 | cpu_stats = os.path.join(per_cpu, cpu, 'stats') |
| 52 | for line in utils.read_file(cpu_stats).splitlines(): |
| 53 | key, val = line.split(': ') |
| 54 | key = key.replace(' ', '_') |
| 55 | val = int(val) |
| 56 | cpu_key = '%s_%s' % (cpu, key) |
| 57 | total_key = 'total_' + key |
| 58 | results[cpu_key] = val |
Eric Li | 861b2d5 | 2011-02-04 14:50:35 -0800 | [diff] [blame] | 59 | results[total_key] = (results.get(total_key, 0) + |
Eric Li | e0493a4 | 2010-11-15 13:05:43 -0800 | [diff] [blame] | 60 | results[cpu_key]) |