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/*
* Copyright (C) 2016 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 CPU_CPU_USAGE_SAMPLER_H_
#define CPU_CPU_USAGE_SAMPLER_H_
#include <cstdint>
#include <mutex>
#include <unordered_set>
#include "proto/cpu_profiler_service.grpc.pb.h"
#include "utils/clock.h"
namespace profiler {
class CpuCache;
class CpuUsageSampler {
public:
// Creates a CPU usage data collector that saves data to |cpu_cache|.
CpuUsageSampler(CpuCache* cpu_cache) : cache_(*cpu_cache) {}
// Starts collecting usage data for process with ID of |pid|, if not already.
profiler::proto::CpuStartResponse::Status AddProcess(int32_t pid);
// Stops collecting usage data for process specified by ID |pid|. Does nothing
// if |pid| is not being monitored.
profiler::proto::CpuStopResponse::Status RemoveProcess(int32_t pid);
// Samples CPU data of all processes that need monitoring. Saves the data to
// |cache_|. Returns true if successfully sampling all processes.
bool Sample();
private:
// Samples the CPU data of a process, including the system-wide usage as a
// context for this process' usage percentage. Returns true on success.
// TODO: Handle the case if there is no running process of |pid|.
bool SampleAProcess(int32_t pid);
// PIDs of app process that are being profiled.
std::unordered_set<int32_t> pids_{};
std::mutex pids_mutex_;
// Cache where collected data will be saved.
CpuCache& cache_;
// Clock that timestamps sample data.
profiler::SteadyClock clock_;
};
} // namespace profiler
#endif // CPU_CPU_USAGE_SAMPLER_H_
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