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107 lines
2.9 KiB
107 lines
2.9 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "CameraLatencyHistogram"
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#include <inttypes.h>
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#include <utils/Log.h>
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#include <utils/String8.h>
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#include "LatencyHistogram.h"
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namespace android {
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CameraLatencyHistogram::CameraLatencyHistogram(int32_t binSizeMs, int32_t binCount) :
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mBinSizeMs(binSizeMs),
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mBinCount(binCount),
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mBins(binCount),
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mTotalCount(0) {
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}
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void CameraLatencyHistogram::add(nsecs_t start, nsecs_t end) {
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nsecs_t duration = end - start;
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int32_t durationMs = static_cast<int32_t>(duration / 1000000LL);
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int32_t binIndex = durationMs / mBinSizeMs;
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if (binIndex < 0) {
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binIndex = 0;
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} else if (binIndex >= mBinCount) {
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binIndex = mBinCount-1;
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}
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mBins[binIndex]++;
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mTotalCount++;
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}
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void CameraLatencyHistogram::reset() {
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memset(mBins.data(), 0, mBins.size() * sizeof(int64_t));
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mTotalCount = 0;
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}
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void CameraLatencyHistogram::dump(int fd, const char* name) const {
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if (mTotalCount == 0) {
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return;
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}
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String8 lines;
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lines.appendFormat("%s (%" PRId64 ") samples\n", name, mTotalCount);
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String8 lineBins, lineBinCounts;
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formatHistogramText(lineBins, lineBinCounts);
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lineBins.append("\n");
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lineBinCounts.append("\n");
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lines.append(lineBins);
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lines.append(lineBinCounts);
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write(fd, lines.string(), lines.size());
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}
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void CameraLatencyHistogram::log(const char* fmt, ...) {
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if (mTotalCount == 0) {
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return;
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}
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va_list args;
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va_start(args, fmt);
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String8 histogramName = String8::formatV(fmt, args);
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ALOGI("%s (%" PRId64 ") samples:", histogramName.string(), mTotalCount);
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va_end(args);
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String8 lineBins, lineBinCounts;
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formatHistogramText(lineBins, lineBinCounts);
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ALOGI("%s", lineBins.c_str());
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ALOGI("%s", lineBinCounts.c_str());
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}
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void CameraLatencyHistogram::formatHistogramText(
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String8& lineBins, String8& lineBinCounts) const {
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lineBins = " ";
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lineBinCounts = " ";
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for (int32_t i = 0; i < mBinCount; i++) {
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if (i == mBinCount - 1) {
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lineBins.append(" inf (max ms)");
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} else {
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lineBins.appendFormat("%7d", mBinSizeMs*(i+1));
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}
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lineBinCounts.appendFormat(" %02.2f", 100.0*mBins[i]/mTotalCount);
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}
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lineBinCounts.append(" (%)");
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}
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}; //namespace android
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