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QBenchlib/Perf: parse multiple counters from -perfcounter 

Change-Id: I3c79b7e08fa346988dfefffd17202ec98947308e
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
bb10
Thiago Macieira 2022-10-21 13:15:05 -07:00
parent 4731baf6d3
commit 3cafd26c1d
1 changed files with 26 additions and 15 deletions
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41
src/testlib/qbenchmarkperfevents.cpp
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@ -409,27 +409,38 @@ void QBenchmarkPerfEventsMeasurer::setCounter(const char *name)
{
initPerf();
eventTypes->clear();
const char *colon = strchr(name, ':');
int n = colon ? colon - name : strlen(name);
const Events *ptr = eventlist;
for ( ; ptr->type != PERF_TYPE_MAX; ++ptr) {
int c = strncmp(name, eventlist_strings + ptr->offset, n);
if (c == 0)
break;
if (c < 0) {
fprintf(stderr, "ERROR: Performance counter type '%s' is unknown\n", name);
exit(1);
}
}
std::string_view input = name;
if (qsizetype idx = input.find(':'); idx >= 0)
input = input.substr(0, idx);
*eventTypes = { { ptr->type, ptr->event_id } };
while (!input.empty()) {
std::string_view countername = input;
if (qsizetype idx = countername.find(','); idx >= 0)
countername = countername.substr(0, idx);
for (const Events *ptr = eventlist; ptr->type != PERF_TYPE_MAX; ++ptr) {
int c = countername.compare(eventlist_strings + ptr->offset);
if (c > 0)
continue;
if (c < 0) {
fprintf(stderr, "ERROR: Performance counter type '%.*s' is unknown\n",
int(countername.size()), countername.data());
exit(1);
}
eventTypes->append({ ptr->type, ptr->event_id });
break;
}
if (countername.size() == input.size())
input = {};
else
input.remove_prefix(countername.size() + 1);
}
// We used to support attributes, but our code was the opposite of what
// perf(1) does, plus QBenchlib isn't exactly expected to be used to
// profile Linux kernel code or launch guest VMs as part of the workload.
// So we keep accepting the colon as a delimiter but ignore it.
if (!colon)
return;
}
void QBenchmarkPerfEventsMeasurer::listCounters()