Go to the documentation of this file. 26 #ifndef AVUTIL_TIMER_H 27 #define AVUTIL_TIMER_H 36 # include <sys/ioctl.h> 37 # include <asm/unistd.h> 38 # include <linux/perf_event.h> 45 #if HAVE_MACH_ABSOLUTE_TIME 46 #include <mach/mach_time.h> 61 #if !defined(AV_READ_TIME) 63 # define AV_READ_TIME gethrtime 64 # elif HAVE_MACH_ABSOLUTE_TIME 65 # define AV_READ_TIME mach_absolute_time 69 #ifndef FF_TIMER_UNITS 70 # define FF_TIMER_UNITS "UNITS" 73 #define TIMER_REPORT(id, tdiff) \ 75 static uint64_t tsum = 0; \ 76 static int tcount = 0; \ 77 static int tskip_count = 0; \ 78 static int thistogram[32] = {0}; \ 79 thistogram[av_log2(tdiff)]++; \ 81 (tdiff) < 8 * tsum / tcount || \ 87 if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \ 89 av_log(NULL, AV_LOG_ERROR, \ 90 "%7"PRIu64" " FF_TIMER_UNITS " in %s,%8d runs,%7d skips", \ 91 tsum * 10 / tcount, id, tcount, tskip_count); \ 92 for (i = 0; i < 32; i++) \ 93 av_log(NULL, AV_LOG_VERBOSE, " %2d", av_log2(2*thistogram[i]));\ 94 av_log(NULL, AV_LOG_ERROR, "\n"); \ 100 #define START_TIMER \ 101 static int linux_perf_fd; \ 103 if (!linux_perf_fd) { \ 104 struct perf_event_attr attr = { \ 105 .type = PERF_TYPE_HARDWARE, \ 106 .size = sizeof(struct perf_event_attr), \ 107 .config = PERF_COUNT_HW_CPU_CYCLES, \ 109 .exclude_kernel = 1, \ 112 linux_perf_fd = syscall(__NR_perf_event_open, &attr, \ 115 if (linux_perf_fd == -1) { \ 116 av_log(NULL, AV_LOG_ERROR, "perf_event_open failed: %s\n", \ 117 av_err2str(AVERROR(errno))); \ 119 ioctl(linux_perf_fd, PERF_EVENT_IOC_RESET, 0); \ 120 ioctl(linux_perf_fd, PERF_EVENT_IOC_ENABLE, 0); \ 123 #define STOP_TIMER(id) \ 124 ioctl(linux_perf_fd, PERF_EVENT_IOC_DISABLE, 0); \ 125 read(linux_perf_fd, &tperf, sizeof(tperf)); \ 126 TIMER_REPORT(id, tperf) 128 #elif defined(AV_READ_TIME) 129 #define START_TIMER \ 131 uint64_t tstart = AV_READ_TIME(); \ 133 #define STOP_TIMER(id) \ 134 tend = AV_READ_TIME(); \ 135 TIMER_REPORT(id, tend - tstart) 138 #define STOP_TIMER(id) { }