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perf intel-bts: Fix endless record after being terminated

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In __cmd_record(), when receiving SIGINT(ctrl + c), a 'done' flag will
be set and the event list will be disabled by evlist__disable() once.

While in auxtrace_record.read_finish(), the related events will be
enabled again, if they are continuous, the recording seems to be
endless.

If the intel_bts event is disabled, we don't enable it again here.

Note: This patch is NOT tested since i don't have such a machine with
intel_bts feature, but the code seems buggy same as arm-spe and
intel-pt.

Signed-off-by: Wei Li <liwei391@huawei.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Tan Xiaojun <tanxiaojun@huawei.com>
Cc: stable@vger.kernel.org # 5.4+
Link: http://lore.kernel.org/lkml/20200214132654.20395-3-adrian.hunter@intel.com
[ahunter: removed redundant 'else' after 'return']
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wei Li 2020-02-14 15:26:51 +02:00 committed by Arnaldo Carvalho de Melo
parent 2da4dd3d69
commit 783fed2f35
1 changed files with 4 additions and 1 deletions
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5
tools/perf/arch/x86/util/intel-bts.c
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@ -420,9 +420,12 @@ static int intel_bts_read_finish(struct auxtrace_record *itr, int idx)
struct evsel *evsel;
evlist__for_each_entry(btsr->evlist, evsel) {
if (evsel->core.attr.type == btsr->intel_bts_pmu->type)
if (evsel->core.attr.type == btsr->intel_bts_pmu->type) {
if (evsel->disabled)
return 0;
return perf_evlist__enable_event_idx(btsr->evlist,
evsel, idx);
}
}
return -EINVAL;
}