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99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_TRACE_EVENT_CPUFREQ_MONITOR_ANDROID_H_
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#define BASE_TRACE_EVENT_CPUFREQ_MONITOR_ANDROID_H_
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#include "base/atomicops.h"
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#include "base/base_export.h"
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#include "base/files/scoped_file.h"
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#include "base/memory/scoped_refptr.h"
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#include "base/trace_event/trace_log.h"
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namespace base {
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class SingleThreadTaskRunner;
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namespace trace_event {
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// A delegate to isolate CPU frequency monitor functionality mainly for testing.
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class BASE_EXPORT CPUFreqMonitorDelegate {
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public:
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CPUFreqMonitorDelegate();
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virtual ~CPUFreqMonitorDelegate() = default;
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// Returns a vector of the minimal set of CPU IDs that we need to monitor to
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// get CPU frequency information. For CPUs that operate cores in a cluster,
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// i.e. modern Qualcomm 8 cores, this is CPU0 and CPU4.
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virtual void GetCPUIds(std::vector<unsigned int>* ids) const;
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// Reads the kernel_max_cpu file to determine the max CPU ID, i.e. 7 on an
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// 8-core CPU.
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virtual unsigned int GetKernelMaxCPUs() const;
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// Reads the frequency from the CPUs being monitored and records them.
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virtual void RecordFrequency(unsigned int cpu_id, unsigned int freq);
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// Returns whether or not the tracing category our CPU Frequency counters are
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// in is enabled to determine if we should record.
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virtual bool IsTraceCategoryEnabled() const;
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// Gets the path to CPU frequency related files for a particular CPU ID.
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virtual std::string GetScalingCurFreqPathString(unsigned int cpu_id) const;
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virtual std::string GetRelatedCPUsPathString(unsigned int cpu_id) const;
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// Allows us to delay creating a task runner, necessary because many tests
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// don't like us creating one outside of a ScopedTaskEnvironment.
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virtual scoped_refptr<SingleThreadTaskRunner> CreateTaskRunner();
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private:
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DISALLOW_COPY_AND_ASSIGN(CPUFreqMonitorDelegate);
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};
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// A class for monitoring the CPU frequency on unique cores/clusters.
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class BASE_EXPORT CPUFreqMonitor : public TraceLog::EnabledStateObserver {
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public:
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// Overhead of reading one cluster on a Nexus 6P is ~0.1ms per CPU. 50ms seems
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// frequent enough to get a general idea of CPU frequency trends.
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static const size_t kDefaultCPUFreqSampleIntervalMs = 50;
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CPUFreqMonitor();
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~CPUFreqMonitor() override;
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static CPUFreqMonitor* GetInstance();
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void Start();
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void Stop();
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// TraceLog::EnabledStateObserver.
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void OnTraceLogEnabled() override;
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void OnTraceLogDisabled() override;
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bool IsEnabledForTesting();
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private:
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friend class CPUFreqMonitorTest;
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CPUFreqMonitor(std::unique_ptr<CPUFreqMonitorDelegate> delegate);
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void Sample(std::vector<std::pair<unsigned int, base::ScopedFD>> fds);
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// Uses the delegate's CreateTaskRunner function to lazily create a task
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// runner so we don't illegally create a task runner on Chrome startup for
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// various tests.
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const scoped_refptr<SingleThreadTaskRunner>& GetOrCreateTaskRunner();
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base::subtle::Atomic32 is_enabled_ = 0;
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scoped_refptr<SingleThreadTaskRunner> task_runner_;
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std::unique_ptr<CPUFreqMonitorDelegate> delegate_;
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base::WeakPtrFactory<CPUFreqMonitor> weak_ptr_factory_;
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DISALLOW_COPY_AND_ASSIGN(CPUFreqMonitor);
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};
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} // namespace trace_event
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} // namespace base
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#endif // BASE_TRACE_EVENT_CPUFREQ_MONITOR_ANDROID_H_
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