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
FastThreadDumpState()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
~FastThreadDumpState()36 FastThreadDumpState::~FastThreadDumpState()
37 {
38 }
39
40 #ifdef FAST_THREAD_STATISTICS
increaseSamplingN(uint32_t samplingN)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