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pe_hw_cache_misses.c
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pe_hw_cache_misses.c
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/*
* perf_examples/pe_hw_cache_misses.c
*
* -- example program to count the last level cache misses
*
* PERF_FORMAT_TOTAL_TIME_ENABLED = disabled
* PERF_FORMAT_TOTAL_TIME_RUNNING = disabled
* PERF_FORMAT_ID = enabled
* PERF_FORMAT_GROUP = disabled
*
* author: Srikanth Yalavarthi
*
*/
#include "pe.h"
struct read_format
{
uint64_t value;
uint64_t id;
};
int main( void )
{
/* perf variables */
struct perf_event_attr pe_attr;
int fd;
uint64_t id;
uint64_t value;
struct read_format rf;
/* define perf event */
memset(&pe_attr, 0, sizeof(pe_attr));
pe_attr.type= PERF_TYPE_HARDWARE;
pe_attr.size = sizeof(struct perf_event_attr);
pe_attr.config = PERF_COUNT_HW_CACHE_MISSES;
pe_attr.disabled = 1;
pe_attr.exclude_kernel = 1;
pe_attr.exclude_hv = 1;
pe_attr.read_format = PERF_FORMAT_ID;
/* open perf event */
fd = perf_event_open(&pe_attr, 0, -1, -1, 0);
if (fd == -1)
{
fprintf(stderr, "error opening leader %llu\n", pe_attr.config);
exit (EXIT_FAILURE);
}
/* get id */
ioctl(fd, PERF_EVENT_IOC_ID, &id);
/* reset counters and enable event */
ioctl(fd, PERF_EVENT_IOC_RESET, 0);
ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
/* do some work */
compute_load();
/* disable the event */
ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
/* read results */
read(fd, &rf, sizeof(rf));
if (rf.id == id)
{
value = rf.value;
}
/* print result */
fprintf(stdout, "Cache Misses = %lu\n", value);
return EXIT_SUCCESS;
}