| /* | |
| * Copyright (C) 2014 The Android Open Source Project | |
| * | |
| * Licensed under the Apache License, Version 2.0 (the "License"); | |
| * you may not use this file except in compliance with the License. | |
| * You may obtain a copy of the License at | |
| * | |
| * http://www.apache.org/licenses/LICENSE-2.0 | |
| * | |
| * Unless required by applicable law or agreed to in writing, software | |
| * distributed under the License is distributed on an "AS IS" BASIS, | |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| * See the License for the specific language governing permissions and | |
| * limitations under the License. | |
| */ | |
| #include <audio_utils/roundup.h> | |
| #include "FastThreadDumpState.h" | |
| namespace android { | |
| FastThreadDumpState::FastThreadDumpState() | |
| { | |
| #ifdef FAST_THREAD_STATISTICS | |
| increaseSamplingN(1); | |
| #endif | |
| } | |
| #ifdef FAST_THREAD_STATISTICS | |
| void FastThreadDumpState::increaseSamplingN(uint32_t samplingN) | |
| { | |
| if (samplingN <= mSamplingN || samplingN > kSamplingN || roundup(samplingN) != samplingN) { | |
| return; | |
| } | |
| const uint32_t additional = samplingN - mSamplingN; | |
| // sample arrays aren't accessed atomically with respect to the bounds, | |
| // so clearing reduces chance for dumpsys to read random uninitialized samples | |
| memset(&mMonotonicNs[mSamplingN], 0, sizeof(mMonotonicNs[0]) * additional); | |
| memset(&mLoadNs[mSamplingN], 0, sizeof(mLoadNs[0]) * additional); | |
| #ifdef CPU_FREQUENCY_STATISTICS | |
| memset(&mCpukHz[mSamplingN], 0, sizeof(mCpukHz[0]) * additional); | |
| #endif | |
| mSamplingN = samplingN; | |
| } | |
| #endif | |
| } // namespace android |