/* * 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 HAVE_MACH_ABSOLUTE_TIME#include <mach/mach_time.h>#endif #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_X86#   include "x86/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;                                               \    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();           \ #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 */