1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "FastThreadDumpState.h" 18 19 namespace android { 20 21 FastThreadDumpState::FastThreadDumpState() : 22 mCommand(FastThreadState::INITIAL), mUnderruns(0), mOverruns(0), 23 /* mMeasuredWarmupTs({0, 0}), */ 24 mWarmupCycles(0) 25 #ifdef FAST_THREAD_STATISTICS 26 , mSamplingN(0), mBounds(0) 27 #endif 28 { 29 mMeasuredWarmupTs.tv_sec = 0; 30 mMeasuredWarmupTs.tv_nsec = 0; 31 #ifdef FAST_THREAD_STATISTICS 32 increaseSamplingN(1); 33 #endif 34 } 35 36 FastThreadDumpState::~FastThreadDumpState() 37 { 38 } 39 40 #ifdef FAST_THREAD_STATISTICS 41 void FastThreadDumpState::increaseSamplingN(uint32_t samplingN) 42 { 43 if (samplingN <= mSamplingN || samplingN > kSamplingN || roundup(samplingN) != samplingN) { 44 return; 45 } 46 uint32_t additional = samplingN - mSamplingN; 47 // sample arrays aren't accessed atomically with respect to the bounds, 48 // so clearing reduces chance for dumpsys to read random uninitialized samples 49 memset(&mMonotonicNs[mSamplingN], 0, sizeof(mMonotonicNs[0]) * additional); 50 memset(&mLoadNs[mSamplingN], 0, sizeof(mLoadNs[0]) * additional); 51 #ifdef CPU_FREQUENCY_STATISTICS 52 memset(&mCpukHz[mSamplingN], 0, sizeof(mCpukHz[0]) * additional); 53 #endif 54 mSamplingN = samplingN; 55 } 56 #endif 57 58 } // android 59
