| /* |
| * 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 |