diff options
Diffstat (limited to 'tools/perf/python')
| -rwxr-xr-x | tools/perf/python/twatch.py | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/tools/perf/python/twatch.py b/tools/perf/python/twatch.py index 2225162ee..b9d508336 100755 --- a/tools/perf/python/twatch.py +++ b/tools/perf/python/twatch.py @@ -18,10 +18,20 @@ import perf def main(): cpus = perf.cpu_map() threads = perf.thread_map() - evsel = perf.evsel(task = 1, comm = 1, mmap = 0, + evsel = perf.evsel(type = perf.TYPE_SOFTWARE, + config = perf.COUNT_SW_DUMMY, + task = 1, comm = 1, mmap = 0, freq = 0, wakeup_events = 1, watermark = 1, sample_id_all = 1, sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU) + + """What we want are just the PERF_RECORD_ lifetime events for threads, + using the default, PERF_TYPE_HARDWARE + PERF_COUNT_HW_CYCLES & freq=1 + (the default), makes perf reenable irq_vectors:local_timer_entry, when + disabling nohz, not good for some use cases where all we want is to get + threads comes and goes... So use (perf.TYPE_SOFTWARE, perf_COUNT_SW_DUMMY, + freq=0) instead.""" + evsel.open(cpus = cpus, threads = threads); evlist = perf.evlist(cpus, threads) evlist.add(evsel) |