On 3/28/15 1:55 AM, Peter Zijlstra wrote:
@@ -761,6 +762,11 @@ void perf_evsel__config(struct perf_evse
attr->disabled = 0;
attr->enable_on_exec = 0;
}
+
+ if (opts->clockid >= 0) {
+ attr->use_clockid = 1;
+ attr->clockid = opts->clockid;
+ }
}
One more: you need to set attr->clockid to -1 if use_clockid is not set
so that the analysis side knows whether attr->clockid was used.
Otherwise it defaults to 0 == CLOCK_REALTIME which is misleading.
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 1abf6919b8a2..27679ab38511 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -766,7 +766,8 @@ void perf_evsel__config(struct perf_evsel *evsel,
struct record_opts *opts)
if (opts->clockid >= 0) {
attr->use_clockid = 1;
attr->clockid = opts->clockid;
- }
+ } else
+ attr->clockid = -1;
}
Dumping the setting in the header is useful as well:
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index fb432153e2aa..40bc8d010fcb 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1098,6 +1098,7 @@ static void print_event_desc(struct perf_header
*ph, int fd, FILE *fp)
}
fprintf(fp, " }");
}
+ fprintf(fp, ", clockid = %d", evsel->attr.clockid);
fputc('\n', fp);
}
--
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