attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
attr->inherit = !opts->no_inherit;
attr->write_backward = opts->overwrite ? 1 : 0;
+ attr->read_format = PERF_FORMAT_LOST;
evsel__set_sample_bit(evsel, IP);
evsel__set_sample_bit(evsel, TID);
static void evsel__disable_missing_features(struct evsel *evsel)
{
+ if (perf_missing_features.read_lost)
+ evsel->core.attr.read_format &= ~PERF_FORMAT_LOST;
if (perf_missing_features.weight_struct) {
evsel__set_sample_bit(evsel, WEIGHT);
evsel__reset_sample_bit(evsel, WEIGHT_STRUCT);
* Must probe features in the order they were added to the
* perf_event_attr interface.
*/
- if (!perf_missing_features.weight_struct &&
+ if (!perf_missing_features.read_lost &&
+ (evsel->core.attr.read_format & PERF_FORMAT_LOST)) {
+ perf_missing_features.read_lost = true;
+ pr_debug2("switching off PERF_FORMAT_LOST support\n");
+ return true;
+ } else if (!perf_missing_features.weight_struct &&
(evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT)) {
perf_missing_features.weight_struct = true;
pr_debug2("switching off weight struct support\n");