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* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#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 {
/*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
// 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
uint32_t mCpukHz[kSamplingN]; // absolute CPU clock frequency in kHz, bits 0-3 are CPU#
// Increase sampling window after construction, must be a power of 2 <= kSamplingN
void increaseSamplingN(uint32_t samplingN);
}; // struct FastThreadDumpState
} // android