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n6.1.5
libavutil/timer.h
158 строк
6 KB
Rémi Denis-Courmont
timer: don't leak perf FD if zero
22 июл 2023, 21:35
22 июл 2023, 21:35
c644aab
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/* * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * high precision timer, useful to profile code */ #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> #if CONFIG_MACOS_KPERF #include "macos_kperf.h" #elif HAVE_MACH_ABSOLUTE_TIME #include <mach/mach_time.h> #endif #include "common.h" #include "log.h" #if ARCH_AARCH64 # include "aarch64/timer.h" #elif ARCH_ARM # include "arm/timer.h" #elif ARCH_PPC # include "ppc/timer.h" #elif ARCH_RISCV # include "riscv/timer.h" #elif ARCH_X86 # include "x86/timer.h" #elif ARCH_LOONGARCH # include "loongarch/timer.h" #endif #if !defined(AV_READ_TIME) # if HAVE_GETHRTIME # define AV_READ_TIME gethrtime # elif HAVE_MACH_ABSOLUTE_TIME # define AV_READ_TIME mach_absolute_time # endif #endif #ifndef FF_TIMER_UNITS # define FF_TIMER_UNITS "UNITS" #endif #define TIMER_REPORT(id, tdiff) \ { \ static uint64_t tsum = 0; \ static int tcount = 0; \ static int tskip_count = 0; \ static int thistogram[32] = {0}; \ thistogram[av_log2(tdiff)]++; \ if (tcount < 2 || \ (tdiff) < 8 * tsum / tcount || \ (tdiff) < 2000) { \ tsum += (tdiff); \ tcount++; \ } else \ tskip_count++; \ if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \ int i; \ av_log(NULL, AV_LOG_ERROR, \ "%7" PRIu64 " " FF_TIMER_UNITS " in %s,%8d runs,%7d skips",\ tsum * 10 / tcount, id, tcount, tskip_count); \ for (i = 0; i < 32; i++) \ av_log(NULL, AV_LOG_VERBOSE, " %2d", av_log2(2*thistogram[i]));\ av_log(NULL, AV_LOG_ERROR, "\n"); \ } \ } #if CONFIG_LINUX_PERF #define START_TIMER \ static int linux_perf_fd = -1; \ uint64_t tperf; \ if (linux_perf_fd == -1) { \ 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 CONFIG_MACOS_KPERF #define START_TIMER \ uint64_t tperf; \ ff_kperf_init(); \ tperf = ff_kperf_cycles(); #define STOP_TIMER(id) \ TIMER_REPORT(id, ff_kperf_cycles() - tperf); #elif defined(AV_READ_TIME) #define START_TIMER \ uint64_t tend; \ uint64_t tstart = AV_READ_TIME(); \ #define STOP_TIMER(id) \ tend = AV_READ_TIME(); \ TIMER_REPORT(id, tend - tstart) #else #define START_TIMER #define STOP_TIMER(id) { } #endif #endif /* AVUTIL_TIMER_H */