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perf script: Fix --per-event-dump for auxtrace synth evsels 

When processing PERF_RECORD_AUXTRACE_INFO several perf_evsel entries
will be synthesized and inserted into session->evlist, eventually ending
in perf_script.tool.sample(), which ends up calling builtin-script.c's
process_event(), that expects evsel->priv to be a perf_evsel_script
object with a valid FILE pointer in fp.

So we need to intercept the processing of PERF_RECORD_AUXTRACE_INFO and
then setup evsel->priv for these newly created perf_evsel instances, do
it to fix the segfault in process_event() trying to use a NULL for that
FILE pointer.

Reported-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: yuzhoujian <yuzhoujian@didichuxing.com>
Fixes: a14390fde6 ("perf script: Allow creating per-event dump files")
Link: http://lkml.kernel.org/n/tip-bthnur8r8de01gxvn2qayx6e@git.kernel.org
[ Merge fix by Ravi Bangoria before pushing upstream to preserv bisectability ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2017-11-09 16:04:26 -03:00
parent 60dbcd2532
commit fa48c89264
1 changed files with 30 additions and 1 deletions
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31
tools/perf/builtin-script.c
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@ -1955,6 +1955,16 @@ static int perf_script__fopen_per_event_dump(struct perf_script *script)
struct perf_evsel *evsel;
evlist__for_each_entry(script->session->evlist, evsel) {
/*
* Already setup? I.e. we may be called twice in cases like
* Intel PT, one for the intel_pt// and dummy events, then
* for the evsels syntheized from the auxtrace info.
*
* Ses perf_script__process_auxtrace_info.
*/
if (evsel->priv != NULL)
continue;
evsel->priv = perf_evsel_script__new(evsel, script->session->data);
if (evsel->priv == NULL)
goto out_err_fclose;
@ -2838,6 +2848,25 @@ int process_cpu_map_event(struct perf_tool *tool __maybe_unused,
return set_maps(script);
}
#ifdef HAVE_AUXTRACE_SUPPORT
static int perf_script__process_auxtrace_info(struct perf_tool *tool,
union perf_event *event,
struct perf_session *session)
{
int ret = perf_event__process_auxtrace_info(tool, event, session);
if (ret == 0) {
struct perf_script *script = container_of(tool, struct perf_script, tool);
ret = perf_script__setup_per_event_dump(script);
}
return ret;
}
#else
#define perf_script__process_auxtrace_info 0
#endif
int cmd_script(int argc, const char **argv)
{
bool show_full_info = false;
@ -2866,7 +2895,7 @@ int cmd_script(int argc, const char **argv)
.feature = perf_event__process_feature,
.build_id = perf_event__process_build_id,
.id_index = perf_event__process_id_index,
.auxtrace_info = perf_event__process_auxtrace_info,
.auxtrace_info = perf_script__process_auxtrace_info,
.auxtrace = perf_event__process_auxtrace,
.auxtrace_error = perf_event__process_auxtrace_error,
.stat = perf_event__process_stat_event,