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73 lines
3.4 KiB
73 lines
3.4 KiB
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_AUDIO_FAST_THREAD_DUMP_STATE_H
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#define ANDROID_AUDIO_FAST_THREAD_DUMP_STATE_H
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#include "Configuration.h"
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#include "FastThreadState.h"
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namespace android {
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// The FastThreadDumpState keeps a cache of FastThread statistics that can be logged by dumpsys.
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// Each individual native word-sized field is accessed atomically. But the
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// overall structure is non-atomic, that is there may be an inconsistency between fields.
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// No barriers or locks are used for either writing or reading.
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// Only POD types are permitted, and the contents shouldn't be trusted (i.e. do range checks).
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// It has a different lifetime than the FastThread, and so it can't be a member of FastThread.
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struct FastThreadDumpState {
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FastThreadDumpState();
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/*virtual*/ ~FastThreadDumpState();
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FastThreadState::Command mCommand; // current command
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uint32_t mUnderruns; // total number of underruns
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uint32_t mOverruns; // total number of overruns
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struct timespec mMeasuredWarmupTs; // measured warmup time
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uint32_t mWarmupCycles; // number of loop cycles required to warmup
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#ifdef FAST_THREAD_STATISTICS
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// Recently collected samples of per-cycle monotonic time, thread CPU time, and CPU frequency.
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// kSamplingN is max size of sampling frame (statistics), and must be a power of 2 <= 0x8000.
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// The sample arrays are virtually allocated based on this compile-time constant,
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// but are only initialized and used based on the runtime parameter mSamplingN.
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static const uint32_t kSamplingN = 0x8000;
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// Compile-time constant for a "low RAM device", must be a power of 2 <= kSamplingN.
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// This value was chosen such that each array uses 1 small page (4 Kbytes).
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static const uint32_t kSamplingNforLowRamDevice = 0x400;
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// Corresponding runtime maximum size of sample arrays, must be a power of 2 <= kSamplingN.
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uint32_t mSamplingN;
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// The bounds define the interval of valid samples, and are represented as follows:
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// newest open (excluded) endpoint = lower 16 bits of bounds, modulo N
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// oldest closed (included) endpoint = upper 16 bits of bounds, modulo N
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// Number of valid samples is newest - oldest.
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uint32_t mBounds; // bounds for mMonotonicNs, mThreadCpuNs, and mCpukHz
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// The elements in the *Ns arrays are in units of nanoseconds <= 3999999999.
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uint32_t mMonotonicNs[kSamplingN]; // delta monotonic (wall clock) time
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uint32_t mLoadNs[kSamplingN]; // delta CPU load in time
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#ifdef CPU_FREQUENCY_STATISTICS
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uint32_t mCpukHz[kSamplingN]; // absolute CPU clock frequency in kHz, bits 0-3 are CPU#
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#endif
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// Increase sampling window after construction, must be a power of 2 <= kSamplingN
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void increaseSamplingN(uint32_t samplingN);
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#endif
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}; // struct FastThreadDumpState
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} // android
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#endif // ANDROID_AUDIO_FAST_THREAD_DUMP_STATE_H
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