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Store the performance counter attributes globally 

This will allow us to modify more attributes from the command-line

Change-Id: I84d4933cbfa2b69c4e1009eaf3e005cfc3e7e01c
Reviewed-by: Jason McDonald <macadder1@gmail.com>
bb10
Thiago Macieira 2012-04-09 18:22:38 -03:00 committed by The Qt Project
parent 914b56dbf5
commit 3963ab9d73
1 changed files with 27 additions and 22 deletions
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49
src/testlib/qbenchmarkperfevents.cpp
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@ -84,8 +84,28 @@
QT_BEGIN_NAMESPACE
static quint32 event_type = PERF_TYPE_HARDWARE;
static quint64 event_id = PERF_COUNT_HW_CPU_CYCLES;
static perf_event_attr attr;
static void initPerf()
{
static bool done;
if (!done) {
memset(&attr, 0, sizeof attr);
attr.size = sizeof attr;
attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | PERF_FORMAT_TOTAL_TIME_RUNNING;
attr.disabled = true; // we'll enable later
attr.inherit = true; // let children processes inherit the monitoring
attr.pinned = true; // keep it running in the hardware
attr.inherit_stat = true; // aggregate all the info from child processes
attr.task = true; // trace fork/exits
// set a default performance counter: CPU cycles
attr.type = PERF_TYPE_HARDWARE;
attr.config = PERF_COUNT_HW_CPU_CYCLES; // default
done = true;
}
}
/*!
\class QBenchmarkPerfEvents
@ -397,6 +417,7 @@ QTest::QBenchmarkMetric QBenchmarkPerfEventsMeasurer::metricForEvent(quint32 typ
void QBenchmarkPerfEventsMeasurer::setCounter(const char *name)
{
initPerf();
const Events *ptr = eventlist;
for ( ; ptr->type != PERF_TYPE_MAX; ++ptr) {
int c = strcmp(name, eventlist_strings + ptr->offset);
@ -408,8 +429,8 @@ void QBenchmarkPerfEventsMeasurer::setCounter(const char *name)
}
}
::event_type = ptr->type;
::event_id = ptr->event_id;
attr.type = ptr->type;
attr.config = ptr->event_id;
}
void QBenchmarkPerfEventsMeasurer::listCounters()
@ -445,24 +466,8 @@ void QBenchmarkPerfEventsMeasurer::init()
void QBenchmarkPerfEventsMeasurer::start()
{
perf_event_attr attr;
memset(&attr, 0, sizeof attr);
// common init
attr.size = sizeof attr;
attr.sample_period = 0;
attr.sample_type = 0;
attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | PERF_FORMAT_TOTAL_TIME_RUNNING;
attr.disabled = true; // start disabled, we'll enable later
attr.inherit = true; // let children inherit, if the benchmark has child processes
attr.pinned = true; // keep it running on the PMU
attr.inherit_stat = true; // collapse all the info from child processes
attr.task = true; // trace fork and exit
// our event type
attr.type = ::event_type;
attr.config = ::event_id;
initPerf();
// pid == 0 -> attach to the current process
// cpu == -1 -> monitor on all CPUs
// group_fd == -1 -> this is the group leader
@ -512,7 +517,7 @@ int QBenchmarkPerfEventsMeasurer::adjustMedianCount(int)
QTest::QBenchmarkMetric QBenchmarkPerfEventsMeasurer::metricType()
{
return metricForEvent(event_type, event_id);
return metricForEvent(attr.type, attr.config);
}
static quint64 rawReadValue(int fd)