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168 lines
6.7 KiB
168 lines
6.7 KiB
/* |
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* high precision timer, useful to profile code |
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*/ |
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#ifndef AVUTIL_TIMER_H |
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#define AVUTIL_TIMER_H |
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#include "config.h" |
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#if CONFIG_LINUX_PERF |
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# ifndef _GNU_SOURCE |
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# define _GNU_SOURCE |
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# endif |
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# include <unistd.h> // read(3) |
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# include <sys/ioctl.h> |
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# include <asm/unistd.h> |
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# include <linux/perf_event.h> |
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#endif |
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#include <stdlib.h> |
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#include <stdint.h> |
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#include <inttypes.h> |
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#if CONFIG_MACOS_KPERF |
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#include "macos_kperf.h" |
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#elif HAVE_MACH_ABSOLUTE_TIME |
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#include <mach/mach_time.h> |
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#elif HAVE_CLOCK_GETTIME |
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#include <time.h> |
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#endif |
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#include "common.h" |
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#include "log.h" |
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#if ARCH_AARCH64 |
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# include "aarch64/timer.h" |
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#elif ARCH_ARM |
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# include "arm/timer.h" |
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#elif ARCH_PPC |
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# include "ppc/timer.h" |
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#elif ARCH_RISCV |
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# include "riscv/timer.h" |
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#elif ARCH_X86 |
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# include "x86/timer.h" |
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#elif ARCH_LOONGARCH |
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# include "loongarch/timer.h" |
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#endif |
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#if !defined(AV_READ_TIME) |
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# if HAVE_GETHRTIME |
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# define AV_READ_TIME gethrtime |
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# elif HAVE_MACH_ABSOLUTE_TIME |
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# define AV_READ_TIME mach_absolute_time |
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# elif HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC) |
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static inline int64_t ff_read_time(void) |
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{ |
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struct timespec ts; |
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clock_gettime(CLOCK_MONOTONIC, &ts); |
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return ts.tv_sec * INT64_C(1000000000) + ts.tv_nsec; |
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} |
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# define AV_READ_TIME ff_read_time |
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# endif |
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#endif |
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#ifndef FF_TIMER_UNITS |
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# define FF_TIMER_UNITS "UNITS" |
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#endif |
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#define TIMER_REPORT(id, tdiff) \ |
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{ \ |
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static uint64_t tsum = 0; \ |
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static int tcount = 0; \ |
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static int tskip_count = 0; \ |
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static int thistogram[32] = {0}; \ |
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thistogram[av_log2(tdiff)]++; \ |
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if (tcount < 2 || \ |
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(tdiff) < 8 * tsum / tcount || \ |
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(tdiff) < 2000) { \ |
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tsum += (tdiff); \ |
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tcount++; \ |
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} else \ |
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tskip_count++; \ |
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if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \ |
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int i; \ |
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av_log(NULL, AV_LOG_ERROR, \ |
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"%7" PRIu64 " " FF_TIMER_UNITS " in %s,%8d runs,%7d skips",\ |
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tsum * 10 / tcount, id, tcount, tskip_count); \ |
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for (i = 0; i < 32; i++) \ |
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av_log(NULL, AV_LOG_VERBOSE, " %2d", av_log2(2*thistogram[i]));\ |
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av_log(NULL, AV_LOG_ERROR, "\n"); \ |
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} \ |
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} |
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#if CONFIG_LINUX_PERF |
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#define START_TIMER \ |
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static int linux_perf_fd = -1; \ |
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uint64_t tperf; \ |
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if (linux_perf_fd == -1) { \ |
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struct perf_event_attr attr = { \ |
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.type = PERF_TYPE_HARDWARE, \ |
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.size = sizeof(struct perf_event_attr), \ |
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.config = PERF_COUNT_HW_CPU_CYCLES, \ |
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.disabled = 1, \ |
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.exclude_kernel = 1, \ |
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.exclude_hv = 1, \ |
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}; \ |
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linux_perf_fd = syscall(__NR_perf_event_open, &attr, \ |
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0, -1, -1, 0); \ |
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} \ |
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if (linux_perf_fd == -1) { \ |
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av_log(NULL, AV_LOG_ERROR, "perf_event_open failed: %s\n", \ |
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av_err2str(AVERROR(errno))); \ |
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} else { \ |
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ioctl(linux_perf_fd, PERF_EVENT_IOC_RESET, 0); \ |
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ioctl(linux_perf_fd, PERF_EVENT_IOC_ENABLE, 0); \ |
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} |
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#define STOP_TIMER(id) \ |
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ioctl(linux_perf_fd, PERF_EVENT_IOC_DISABLE, 0); \ |
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read(linux_perf_fd, &tperf, sizeof(tperf)); \ |
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TIMER_REPORT(id, tperf) |
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#elif CONFIG_MACOS_KPERF |
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#define START_TIMER \ |
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uint64_t tperf; \ |
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ff_kperf_init(); \ |
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tperf = ff_kperf_cycles(); |
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#define STOP_TIMER(id) \ |
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TIMER_REPORT(id, ff_kperf_cycles() - tperf); |
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#elif defined(AV_READ_TIME) |
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#define START_TIMER \ |
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uint64_t tend; \ |
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uint64_t tstart = AV_READ_TIME(); \ |
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#define STOP_TIMER(id) \ |
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tend = AV_READ_TIME(); \ |
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TIMER_REPORT(id, tend - tstart) |
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#else |
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#define START_TIMER |
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#define STOP_TIMER(id) { } |
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#endif |
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#endif /* AVUTIL_TIMER_H */
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