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| 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 |
| 59 results[total_key] = (results.get(total_key, 0) + |
| 60 results[cpu_key]) |
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