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Perf event interface was linux specfic and use ifdef to protect

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This commit is contained in:
Peter Boyle 2015-11-29 00:24:48 +00:00
parent 825875fd48
commit 54f04ee5c9
1 changed files with 27 additions and 3 deletions
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30
lib/PerfCount.h
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@ -5,22 +5,27 @@
#include <ctime>
#include <chrono>
#include <string.h>
#include <sys/ioctl.h>
#ifdef __linux__
#include <syscall.h>
#include <linux/perf_event.h>
#endif
namespace Grid {
#ifdef __linux__
static long perf_event_open(struct perf_event_attr *hw_event, pid_t pid,
int cpu, int group_fd, unsigned long flags)
{
int ret;
int ret=0;
ret = syscall(__NR_perf_event_open, hw_event, pid, cpu,
group_fd, flags);
return ret;
}
#endif
class PerformanceCounter {
@ -63,7 +68,6 @@ public:
int PCT;
struct perf_event_attr pe;
long long count;
int fd;
uint64_t elapsed;
@ -74,15 +78,19 @@ public:
}
PerformanceCounter(int _pct) {
#ifdef __linux__
assert(_pct>=0);
assert(_pct<PERFORMANCE_COUNTER_NUM_TYPES);
fd=-1;
count=0;
PCT =_pct;
Open();
#endif
}
void Open(void)
{
#ifdef __linux__
struct perf_event_attr pe;
memset(&pe, 0, sizeof(struct perf_event_attr));
pe.size = sizeof(struct perf_event_attr);
@ -99,32 +107,48 @@ public:
fprintf(stderr, "Error opening leader %llx for event %s\n", pe.config,name);
perror("Error is");
}
#endif
}
void Start(void)
{
#ifdef __linux__
if ( fd!= -1) {
ioctl(fd, PERF_EVENT_IOC_RESET, 0);
ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
}
begin =__rdtsc();
#else
begin = 0;
#endif
}
void Stop(void) {
count=0;
#ifdef __linux__
if ( fd!= -1) {
ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
::read(fd, &count, sizeof(long long));
}
elapsed = __rdtsc() - begin;
#else
elapsed = 0;
#endif
}
void Report(void) {
#ifdef __linux__
printf("%llu cycles %s = %20llu\n", elapsed , PerformanceCounterConfigs[PCT].name, count);
#else
printf("%llu cycles \n", elapsed );
#endif
}
~PerformanceCounter()
{
#ifdef __linux__
close(fd);
#endif
}
};