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|
//===- Perf.inc ----------------------------------------------------------===//
//
// The SkyPat Team
//
// This file is distributed under the New BSD License.
// See LICENSE for details.
//
//===----------------------------------------------------------------------===//
#include <skypat/Support/ManagedStatic.h>
#include <time.h>
#include <unistd.h>
#include <cassert>
#if defined(HAVE_LINUX_PERF_EVENT_H)
#include <linux/perf_event.h>
#include <sys/ioctl.h>
#include <cstring>
#include <cstdlib>
#if defined(HAVE_ASM_UNISTD_H)
#include <asm/unistd.h>
#endif
#endif
#ifndef SKYPAT_SKYPAT_H
#include <skypat/skypat.h>
#endif
namespace skypat {
namespace testing {
namespace internal {
//===----------------------------------------------------------------------===//
// Perf Implementation
//===----------------------------------------------------------------------===//
class PerfImpl
{
public:
PerfImpl() {
}
~PerfImpl() {
#if defined(HAVE_LINUX_PERF_EVENT_H)
close(m_Fd);
#endif
}
testing::Interval getCounter() {
#if defined(HAVE_LINUX_PERF_EVENT_H)
unsigned long long counter;
read(m_Fd, &counter, sizeof(unsigned long long));
return counter;
#else
return 0;
#endif
return -1;
}
void init(enum PerfEvent pEvent) {
#if defined(HAVE_LINUX_PERF_EVENT_H)
/* store the perf event numbers with the same order of skypat:Perf_event_name */
static const decltype(perf_event_attr::config)
event_list[] = {
PERF_COUNT_HW_CPU_CYCLES, PERF_COUNT_HW_INSTRUCTIONS,
PERF_COUNT_HW_CACHE_REFERENCES, PERF_COUNT_HW_CACHE_MISSES,
PERF_COUNT_HW_BRANCH_INSTRUCTIONS, PERF_COUNT_HW_BRANCH_MISSES,
PERF_COUNT_HW_BUS_CYCLES, PERF_COUNT_HW_STALLED_CYCLES_FRONTEND,
PERF_COUNT_HW_STALLED_CYCLES_BACKEND, PERF_COUNT_HW_REF_CPU_CYCLES,
PERF_COUNT_SW_CPU_CLOCK, PERF_COUNT_SW_TASK_CLOCK,
PERF_COUNT_SW_PAGE_FAULTS, PERF_COUNT_SW_CONTEXT_SWITCHES,
PERF_COUNT_SW_CPU_MIGRATIONS, PERF_COUNT_SW_PAGE_FAULTS_MIN,
PERF_COUNT_SW_PAGE_FAULTS_MAJ, PERF_COUNT_SW_ALIGNMENT_FAULTS,
PERF_COUNT_SW_EMULATION_FAULTS,
#ifdef PERF_COUNT_SW_DUMMY
PERF_COUNT_SW_DUMMY
#else
0
#endif
};
struct perf_event_attr attr;
memset(&attr, 0, sizeof(attr));
attr.inherit = 1;
attr.disabled = 1;
attr.config = event_list[pEvent];
if(pEvent < PerfEvent::CPU_CLOCK)
attr.type = PERF_TYPE_HARDWARE;
else
attr.type = PERF_TYPE_SOFTWARE;
attr.size = sizeof(attr);
m_Fd = syscall(__NR_perf_event_open, &attr, 0, -1, -1, 0);
#endif
}
void start() {
#if defined(HAVE_LINUX_PERF_EVENT_H)
ioctl(m_Fd, PERF_EVENT_IOC_ENABLE);
#endif
m_Start = getCounter();
assert(-1 != m_Start && "fail to get performance counters");
}
void stop() {
#if defined(HAVE_LINUX_PERF_EVENT_H)
ioctl(m_Fd, PERF_EVENT_IOC_DISABLE);
#endif
m_End = getCounter();
assert(-1 != m_End && "fail to get performance counters");
}
testing::Interval getValue() const {
return (m_End - m_Start);
}
private:
testing::Interval m_Start;
testing::Interval m_End;
static long g_ClkTick;
int m_Fd;
};
long PerfImpl::g_ClkTick = -1;
static ManagedStatic<PerfImpl> g_Perf;
//===----------------------------------------------------------------------===//
// Perf
//===----------------------------------------------------------------------===//
Perf::Perf()
: m_Interval(0), m_EventType(PerfEvent::CONTEXT_SWITCHES), m_bIsActive(false) {
g_Perf->init(PerfEvent::CONTEXT_SWITCHES);
g_Perf->start();
}
Perf::Perf(enum PerfEvent pEvent)
: m_Interval(0), m_EventType(pEvent), m_bIsActive(false) {
g_Perf->init(pEvent);
g_Perf->start();
}
Perf::~Perf()
{
g_Perf->stop();
}
void Perf::start()
{
m_Interval = g_Perf->getValue();
m_bIsActive = true;
}
void Perf::stop()
{
m_Interval = g_Perf->getValue() - m_Interval;
m_bIsActive = false;
}
std::string Perf::unit()
{
return "times";
}
} // namespace of internal
} // namespace of testing
} // namespace of skypat
|
