102 lines
3.3 KiB
C++
102 lines
3.3 KiB
C++
/*
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* Copyright (C) 2015 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 SIMPLE_PERF_EVENT_SELECTION_SET_H_
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#define SIMPLE_PERF_EVENT_SELECTION_SET_H_
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#include <functional>
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#include <map>
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#include <vector>
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#include <android-base/macros.h>
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#include "event_fd.h"
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#include "event_type.h"
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#include "perf_event.h"
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struct CountersInfo {
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const EventTypeAndModifier* event_type;
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struct CounterInfo {
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pid_t tid;
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int cpu;
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PerfCounter counter;
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};
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std::vector<CounterInfo> counters;
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};
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struct pollfd;
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// EventSelectionSet helps to monitor events.
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// Firstly, the user creates an EventSelectionSet, and adds the specific event types to monitor.
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// Secondly, the user defines how to monitor the events (by setting enable_on_exec flag,
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// sample frequency, etc).
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// Then, the user can start monitoring by ordering the EventSelectionSet to open perf event files
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// and enable events (if enable_on_exec flag isn't used).
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// After that, the user can read counters or read mapped event records.
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// At last, the EventSelectionSet will clean up resources at destruction automatically.
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class EventSelectionSet {
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public:
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EventSelectionSet() {
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}
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bool Empty() const {
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return selections_.empty();
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}
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bool AddEventType(const EventTypeAndModifier& event_type_modifier);
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void SetEnableOnExec(bool enable);
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bool GetEnableOnExec();
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void SampleIdAll();
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void SetSampleFreq(uint64_t sample_freq);
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void SetSamplePeriod(uint64_t sample_period);
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bool SetBranchSampling(uint64_t branch_sample_type);
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void EnableFpCallChainSampling();
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bool EnableDwarfCallChainSampling(uint32_t dump_stack_size);
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void SetInherit(bool enable);
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bool OpenEventFilesForCpus(const std::vector<int>& cpus);
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bool OpenEventFilesForThreadsOnCpus(const std::vector<pid_t>& threads, std::vector<int> cpus);
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bool ReadCounters(std::vector<CountersInfo>* counters);
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void PreparePollForEventFiles(std::vector<pollfd>* pollfds);
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bool MmapEventFiles(size_t mmap_pages);
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bool ReadMmapEventData(std::function<bool(const char*, size_t)> callback);
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const perf_event_attr* FindEventAttrByType(const EventTypeAndModifier& event_type_modifier);
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const std::vector<std::unique_ptr<EventFd>>* FindEventFdsByType(
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const EventTypeAndModifier& event_type_modifier);
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private:
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void UnionSampleType();
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bool OpenEventFiles(const std::vector<pid_t>& threads, const std::vector<int>& cpus);
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struct EventSelection {
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EventTypeAndModifier event_type_modifier;
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perf_event_attr event_attr;
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std::vector<std::unique_ptr<EventFd>> event_fds;
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};
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EventSelection* FindSelectionByType(const EventTypeAndModifier& event_type_modifier);
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std::vector<EventSelection> selections_;
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DISALLOW_COPY_AND_ASSIGN(EventSelectionSet);
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};
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bool IsBranchSamplingSupported();
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bool IsDwarfCallChainSamplingSupported();
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#endif // SIMPLE_PERF_EVENT_SELECTION_SET_H_
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