| /* |
| * 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. |
| */ |
| |
| #ifndef ANDROID_AUDIO_FAST_THREAD_DUMP_STATE_H |
| #define ANDROID_AUDIO_FAST_THREAD_DUMP_STATE_H |
| |
| #include "Configuration.h" |
| #include "FastThreadState.h" |
| |
| namespace android { |
| |
| // The FastThreadDumpState keeps a cache of FastThread statistics that can be logged by dumpsys. |
| // Each individual native word-sized field is accessed atomically. But the |
| // overall structure is non-atomic, that is there may be an inconsistency between fields. |
| // No barriers or locks are used for either writing or reading. |
| // Only POD types are permitted, and the contents shouldn't be trusted (i.e. do range checks). |
| // It has a different lifetime than the FastThread, and so it can't be a member of FastThread. |
| struct FastThreadDumpState { |
| FastThreadDumpState(); |
| /*virtual*/ ~FastThreadDumpState(); |
| |
| FastThreadState::Command mCommand; // current command |
| uint32_t mUnderruns; // total number of underruns |
| uint32_t mOverruns; // total number of overruns |
| struct timespec mMeasuredWarmupTs; // measured warmup time |
| uint32_t mWarmupCycles; // number of loop cycles required to warmup |
| |
| #ifdef FAST_THREAD_STATISTICS |
| // Recently collected samples of per-cycle monotonic time, thread CPU time, and CPU frequency. |
| // kSamplingN is max size of sampling frame (statistics), and must be a power of 2 <= 0x8000. |
| // The sample arrays are virtually allocated based on this compile-time constant, |
| // but are only initialized and used based on the runtime parameter mSamplingN. |
| static const uint32_t kSamplingN = 0x8000; |
| // Compile-time constant for a "low RAM device", must be a power of 2 <= kSamplingN. |
| // This value was chosen such that each array uses 1 small page (4 Kbytes). |
| static const uint32_t kSamplingNforLowRamDevice = 0x400; |
| // Corresponding runtime maximum size of sample arrays, must be a power of 2 <= kSamplingN. |
| uint32_t mSamplingN; |
| // The bounds define the interval of valid samples, and are represented as follows: |
| // newest open (excluded) endpoint = lower 16 bits of bounds, modulo N |
| // oldest closed (included) endpoint = upper 16 bits of bounds, modulo N |
| // Number of valid samples is newest - oldest. |
| uint32_t mBounds; // bounds for mMonotonicNs, mThreadCpuNs, and mCpukHz |
| // The elements in the *Ns arrays are in units of nanoseconds <= 3999999999. |
| uint32_t mMonotonicNs[kSamplingN]; // delta monotonic (wall clock) time |
| uint32_t mLoadNs[kSamplingN]; // delta CPU load in time |
| #ifdef CPU_FREQUENCY_STATISTICS |
| uint32_t mCpukHz[kSamplingN]; // absolute CPU clock frequency in kHz, bits 0-3 are CPU# |
| #endif |
| |
| // Increase sampling window after construction, must be a power of 2 <= kSamplingN |
| void increaseSamplingN(uint32_t samplingN); |
| #endif |
| |
| }; // struct FastThreadDumpState |
| |
| } // android |
| |
| #endif // ANDROID_AUDIO_FAST_THREAD_DUMP_STATE_H |