#ifndef AVUTIL_TIMER_H
#define AVUTIL_TIMER_H
+#include "config.h"
+
+#if CONFIG_LINUX_PERF
+# ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+# endif
+# include <unistd.h> // read(3)
+# include <sys/ioctl.h>
+# include <asm/unistd.h>
+# include <linux/perf_event.h>
+#endif
+
#include <stdlib.h>
#include <stdint.h>
#include <inttypes.h>
-#include "config.h"
-
#if HAVE_MACH_MACH_TIME_H
#include <mach/mach_time.h>
#endif
} \
}
-#ifdef AV_READ_TIME
+#if CONFIG_LINUX_PERF
+
+#define START_TIMER \
+ static int linux_perf_fd; \
+ uint64_t tperf; \
+ if (!linux_perf_fd) { \
+ struct perf_event_attr attr = { \
+ .type = PERF_TYPE_HARDWARE, \
+ .size = sizeof(struct perf_event_attr), \
+ .config = PERF_COUNT_HW_CPU_CYCLES, \
+ .disabled = 1, \
+ .exclude_kernel = 1, \
+ .exclude_hv = 1, \
+ }; \
+ linux_perf_fd = syscall(__NR_perf_event_open, &attr, \
+ 0, -1, -1, 0); \
+ } \
+ if (linux_perf_fd == -1) { \
+ av_log(NULL, AV_LOG_ERROR, "perf_event_open failed: %s\n", \
+ av_err2str(AVERROR(errno))); \
+ } else { \
+ ioctl(linux_perf_fd, PERF_EVENT_IOC_RESET, 0); \
+ ioctl(linux_perf_fd, PERF_EVENT_IOC_ENABLE, 0); \
+ }
+
+#define STOP_TIMER(id) \
+ ioctl(linux_perf_fd, PERF_EVENT_IOC_DISABLE, 0); \
+ read(linux_perf_fd, &tperf, sizeof(tperf)); \
+ TIMER_REPORT(id, tperf)
+
+#elif defined(AV_READ_TIME)
#define START_TIMER \
uint64_t tend; \
uint64_t tstart = AV_READ_TIME(); \