| /* |
| * Copyright 2009, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| |
| #include "statsreport/common/highres_timer.h" |
| |
| bool HighresTimer::perf_ratio_collected_ = false; |
| mach_timebase_info_data_t HighresTimer::perf_ratio_ = {0}; |
| |
| const uint64 NANOS_IN_MILLI = 1000000L; |
| const uint64 NANOS_IN_HALF_MILLI = 500000L; |
| const uint64 NANOS_IN_SECOND = 1000000000L; |
| const uint64 NANOS_IN_HALF_SECOND = 500000000L; |
| |
| uint64 HighresTimer::GetElapsedMs() const { |
| uint64 end_time = GetCurrentTicks(); |
| |
| // Scale to ms and round to nearest ms - rounding is important |
| // because otherwise the truncation error may accumulate e.g. in sums. |
| // |
| (void)GetTimerFrequency(); |
| return (static_cast<uint64>(end_time - start_ticks_) * perf_ratio_.numer + |
| NANOS_IN_HALF_MILLI * perf_ratio_.denom) / |
| (NANOS_IN_MILLI * perf_ratio_.denom); |
| } |
| |
| uint64 HighresTimer::GetElapsedSec() const { |
| uint64 end_time = GetCurrentTicks(); |
| |
| // Scale to ms and round to nearest ms - rounding is important |
| // because otherwise the truncation error may accumulate e.g. in sums. |
| // |
| (void)GetTimerFrequency(); |
| return (static_cast<uint64>(end_time - start_ticks_) * perf_ratio_.numer + |
| NANOS_IN_HALF_SECOND * perf_ratio_.denom) / |
| (NANOS_IN_SECOND * perf_ratio_.denom); |
| } |
| |
| void HighresTimer::CollectPerfRatio() { |
| mach_timebase_info(&perf_ratio_); |
| perf_ratio_collected_ = true; |
| } |