perf python: Use attr.watermark in twatch.py

We want to be woken up for every PERF_RECORD_ event, attr.wakeup_events
is only for PERF_RECORD_SAMPLE, so also use attr.watermark = 1 to fix
that.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-v3lnpwgrr8mllcr3ntduuqvc@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/python/twatch.py b/tools/perf/python/twatch.py
index df638c438a9f90088e41c0e730095078f0a4670a..b11cca584238e9a32636349b39511360fc85f5b0 100755 (executable)
--- a/tools/perf/python/twatch.py
+++ b/tools/perf/python/twatch.py
@@ -19,7 +19,7 @@ def main():
        cpus = perf.cpu_map()
        threads = perf.thread_map()
        evsel = perf.evsel(task = 1, comm = 1, mmap = 0,
-                          wakeup_events = 1, sample_period = 1,
+                          wakeup_events = 1, watermark = 1,
                           sample_id_all = 1,
                           sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_TID)
        evsel.open(cpus = cpus, threads = threads);