| /* |
| * Copyright (C) 2015 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. |
| */ |
| |
| #include "event_selection_set.h" |
| |
| #include <atomic> |
| #include <thread> |
| |
| #include <android-base/logging.h> |
| |
| #include "environment.h" |
| #include "event_attr.h" |
| #include "event_type.h" |
| #include "IOEventLoop.h" |
| #include "perf_regs.h" |
| #include "utils.h" |
| |
| constexpr uint64_t DEFAULT_SAMPLE_FREQ_FOR_NONTRACEPOINT_EVENT = 4000; |
| constexpr uint64_t DEFAULT_SAMPLE_PERIOD_FOR_TRACEPOINT_EVENT = 1; |
| |
| bool IsBranchSamplingSupported() { |
| const EventType* type = FindEventTypeByName("cpu-cycles"); |
| if (type == nullptr) { |
| return false; |
| } |
| perf_event_attr attr = CreateDefaultPerfEventAttr(*type); |
| attr.sample_type |= PERF_SAMPLE_BRANCH_STACK; |
| attr.branch_sample_type = PERF_SAMPLE_BRANCH_ANY; |
| return IsEventAttrSupported(attr); |
| } |
| |
| bool IsDwarfCallChainSamplingSupported() { |
| const EventType* type = FindEventTypeByName("cpu-cycles"); |
| if (type == nullptr) { |
| return false; |
| } |
| perf_event_attr attr = CreateDefaultPerfEventAttr(*type); |
| attr.sample_type |= |
| PERF_SAMPLE_CALLCHAIN | PERF_SAMPLE_REGS_USER | PERF_SAMPLE_STACK_USER; |
| attr.exclude_callchain_user = 1; |
| attr.sample_regs_user = GetSupportedRegMask(GetBuildArch()); |
| attr.sample_stack_user = 8192; |
| return IsEventAttrSupported(attr); |
| } |
| |
| bool IsDumpingRegsForTracepointEventsSupported() { |
| const EventType* event_type = FindEventTypeByName("sched:sched_switch"); |
| if (event_type == nullptr) { |
| return false; |
| } |
| std::atomic<bool> done(false); |
| std::atomic<pid_t> thread_id(0); |
| std::thread thread([&]() { |
| thread_id = gettid(); |
| while (!done) { |
| usleep(1); |
| } |
| usleep(1); // Make a sched out to generate one sample. |
| }); |
| while (thread_id == 0) { |
| usleep(1); |
| } |
| perf_event_attr attr = CreateDefaultPerfEventAttr(*event_type); |
| attr.freq = 0; |
| attr.sample_period = 1; |
| std::unique_ptr<EventFd> event_fd = |
| EventFd::OpenEventFile(attr, thread_id, -1, nullptr); |
| if (event_fd == nullptr) { |
| return false; |
| } |
| if (!event_fd->CreateMappedBuffer(4, true)) { |
| return false; |
| } |
| done = true; |
| thread.join(); |
| |
| std::vector<char> buffer; |
| size_t buffer_pos = 0; |
| size_t size = event_fd->GetAvailableMmapData(buffer, buffer_pos); |
| std::vector<std::unique_ptr<Record>> records = |
| ReadRecordsFromBuffer(attr, buffer.data(), size); |
| for (auto& r : records) { |
| if (r->type() == PERF_RECORD_SAMPLE) { |
| auto& record = *static_cast<SampleRecord*>(r.get()); |
| if (record.ip_data.ip != 0) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| bool EventSelectionSet::BuildAndCheckEventSelection( |
| const std::string& event_name, EventSelection* selection) { |
| std::unique_ptr<EventTypeAndModifier> event_type = ParseEventType(event_name); |
| if (event_type == nullptr) { |
| return false; |
| } |
| if (for_stat_cmd_) { |
| if (event_type->event_type.name == "cpu-clock" || |
| event_type->event_type.name == "task-clock") { |
| if (event_type->exclude_user || event_type->exclude_kernel) { |
| LOG(ERROR) << "Modifier u and modifier k used in event type " |
| << event_type->event_type.name |
| << " are not supported by the kernel."; |
| return false; |
| } |
| } |
| } |
| selection->event_type_modifier = *event_type; |
| selection->event_attr = CreateDefaultPerfEventAttr(event_type->event_type); |
| selection->event_attr.exclude_user = event_type->exclude_user; |
| selection->event_attr.exclude_kernel = event_type->exclude_kernel; |
| selection->event_attr.exclude_hv = event_type->exclude_hv; |
| selection->event_attr.exclude_host = event_type->exclude_host; |
| selection->event_attr.exclude_guest = event_type->exclude_guest; |
| selection->event_attr.precise_ip = event_type->precise_ip; |
| if (!IsEventAttrSupported(selection->event_attr)) { |
| LOG(ERROR) << "Event type '" << event_type->name |
| << "' is not supported on the device"; |
| return false; |
| } |
| selection->event_fds.clear(); |
| |
| for (const auto& group : groups_) { |
| for (const auto& sel : group) { |
| if (sel.event_type_modifier.name == selection->event_type_modifier.name) { |
| LOG(ERROR) << "Event type '" << sel.event_type_modifier.name |
| << "' appears more than once"; |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| bool EventSelectionSet::AddEventType(const std::string& event_name) { |
| return AddEventGroup(std::vector<std::string>(1, event_name)); |
| } |
| |
| bool EventSelectionSet::AddEventGroup( |
| const std::vector<std::string>& event_names) { |
| EventSelectionGroup group; |
| for (const auto& event_name : event_names) { |
| EventSelection selection; |
| if (!BuildAndCheckEventSelection(event_name, &selection)) { |
| return false; |
| } |
| group.push_back(std::move(selection)); |
| } |
| groups_.push_back(std::move(group)); |
| UnionSampleType(); |
| return true; |
| } |
| |
| std::vector<const EventType*> EventSelectionSet::GetEvents() const { |
| std::vector<const EventType*> result; |
| for (const auto& group : groups_) { |
| for (const auto& selection : group) { |
| result.push_back(&selection.event_type_modifier.event_type); |
| } |
| } |
| return result; |
| } |
| |
| std::vector<const EventType*> EventSelectionSet::GetTracepointEvents() const { |
| std::vector<const EventType*> result; |
| for (const auto& group : groups_) { |
| for (const auto& selection : group) { |
| if (selection.event_type_modifier.event_type.type == |
| PERF_TYPE_TRACEPOINT) { |
| result.push_back(&selection.event_type_modifier.event_type); |
| } |
| } |
| } |
| return result; |
| } |
| |
| bool EventSelectionSet::HasInplaceSampler() const { |
| for (const auto& group : groups_) { |
| for (const auto& sel : group) { |
| if (sel.event_attr.type == SIMPLEPERF_TYPE_USER_SPACE_SAMPLERS && |
| sel.event_attr.config == SIMPLEPERF_CONFIG_INPLACE_SAMPLER) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| std::vector<EventAttrWithId> EventSelectionSet::GetEventAttrWithId() const { |
| std::vector<EventAttrWithId> result; |
| for (const auto& group : groups_) { |
| for (const auto& selection : group) { |
| EventAttrWithId attr_id; |
| attr_id.attr = &selection.event_attr; |
| for (const auto& fd : selection.event_fds) { |
| attr_id.ids.push_back(fd->Id()); |
| } |
| if (!selection.inplace_samplers.empty()) { |
| attr_id.ids.push_back(selection.inplace_samplers[0]->Id()); |
| } |
| result.push_back(attr_id); |
| } |
| } |
| return result; |
| } |
| |
| // Union the sample type of different event attrs can make reading sample |
| // records in perf.data easier. |
| void EventSelectionSet::UnionSampleType() { |
| uint64_t sample_type = 0; |
| for (const auto& group : groups_) { |
| for (const auto& selection : group) { |
| sample_type |= selection.event_attr.sample_type; |
| } |
| } |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| selection.event_attr.sample_type = sample_type; |
| } |
| } |
| } |
| |
| void EventSelectionSet::SetEnableOnExec(bool enable) { |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| // If sampling is enabled on exec, then it is disabled at startup, |
| // otherwise it should be enabled at startup. Don't use |
| // ioctl(PERF_EVENT_IOC_ENABLE) to enable it after perf_event_open(). |
| // Because some android kernels can't handle ioctl() well when cpu-hotplug |
| // happens. See http://b/25193162. |
| if (enable) { |
| selection.event_attr.enable_on_exec = 1; |
| selection.event_attr.disabled = 1; |
| } else { |
| selection.event_attr.enable_on_exec = 0; |
| selection.event_attr.disabled = 0; |
| } |
| } |
| } |
| } |
| |
| bool EventSelectionSet::GetEnableOnExec() { |
| for (const auto& group : groups_) { |
| for (const auto& selection : group) { |
| if (selection.event_attr.enable_on_exec == 0) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| void EventSelectionSet::SampleIdAll() { |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| selection.event_attr.sample_id_all = 1; |
| } |
| } |
| } |
| |
| void EventSelectionSet::SetSampleFreq(uint64_t sample_freq) { |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| selection.event_attr.freq = 1; |
| selection.event_attr.sample_freq = sample_freq; |
| } |
| } |
| } |
| |
| void EventSelectionSet::SetSamplePeriod(uint64_t sample_period) { |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| selection.event_attr.freq = 0; |
| selection.event_attr.sample_period = sample_period; |
| } |
| } |
| } |
| |
| void EventSelectionSet::UseDefaultSampleFreq() { |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| if (selection.event_type_modifier.event_type.type == |
| PERF_TYPE_TRACEPOINT) { |
| selection.event_attr.freq = 0; |
| selection.event_attr.sample_period = |
| DEFAULT_SAMPLE_PERIOD_FOR_TRACEPOINT_EVENT; |
| } else { |
| selection.event_attr.freq = 1; |
| selection.event_attr.sample_freq = |
| DEFAULT_SAMPLE_FREQ_FOR_NONTRACEPOINT_EVENT; |
| } |
| } |
| } |
| } |
| |
| bool EventSelectionSet::SetBranchSampling(uint64_t branch_sample_type) { |
| if (branch_sample_type != 0 && |
| (branch_sample_type & |
| (PERF_SAMPLE_BRANCH_ANY | PERF_SAMPLE_BRANCH_ANY_CALL | |
| PERF_SAMPLE_BRANCH_ANY_RETURN | PERF_SAMPLE_BRANCH_IND_CALL)) == 0) { |
| LOG(ERROR) << "Invalid branch_sample_type: 0x" << std::hex |
| << branch_sample_type; |
| return false; |
| } |
| if (branch_sample_type != 0 && !IsBranchSamplingSupported()) { |
| LOG(ERROR) << "branch stack sampling is not supported on this device."; |
| return false; |
| } |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| perf_event_attr& attr = selection.event_attr; |
| if (branch_sample_type != 0) { |
| attr.sample_type |= PERF_SAMPLE_BRANCH_STACK; |
| } else { |
| attr.sample_type &= ~PERF_SAMPLE_BRANCH_STACK; |
| } |
| attr.branch_sample_type = branch_sample_type; |
| } |
| } |
| return true; |
| } |
| |
| void EventSelectionSet::EnableFpCallChainSampling() { |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| selection.event_attr.sample_type |= PERF_SAMPLE_CALLCHAIN; |
| } |
| } |
| } |
| |
| bool EventSelectionSet::EnableDwarfCallChainSampling(uint32_t dump_stack_size) { |
| if (!IsDwarfCallChainSamplingSupported()) { |
| LOG(ERROR) << "dwarf callchain sampling is not supported on this device."; |
| return false; |
| } |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| selection.event_attr.sample_type |= PERF_SAMPLE_CALLCHAIN | |
| PERF_SAMPLE_REGS_USER | |
| PERF_SAMPLE_STACK_USER; |
| selection.event_attr.exclude_callchain_user = 1; |
| selection.event_attr.sample_regs_user = |
| GetSupportedRegMask(GetMachineArch()); |
| selection.event_attr.sample_stack_user = dump_stack_size; |
| } |
| } |
| return true; |
| } |
| |
| void EventSelectionSet::SetInherit(bool enable) { |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| selection.event_attr.inherit = (enable ? 1 : 0); |
| } |
| } |
| } |
| |
| bool EventSelectionSet::NeedKernelSymbol() const { |
| for (const auto& group : groups_) { |
| for (const auto& selection : group) { |
| if (!selection.event_type_modifier.exclude_kernel) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| static bool CheckIfCpusOnline(const std::vector<int>& cpus) { |
| std::vector<int> online_cpus = GetOnlineCpus(); |
| for (const auto& cpu : cpus) { |
| if (std::find(online_cpus.begin(), online_cpus.end(), cpu) == |
| online_cpus.end()) { |
| LOG(ERROR) << "cpu " << cpu << " is not online."; |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool EventSelectionSet::OpenEventFilesOnGroup(EventSelectionGroup& group, |
| pid_t tid, int cpu, |
| std::string* failed_event_type) { |
| std::vector<std::unique_ptr<EventFd>> event_fds; |
| // Given a tid and cpu, events on the same group should be all opened |
| // successfully or all failed to open. |
| EventFd* group_fd = nullptr; |
| for (auto& selection : group) { |
| std::unique_ptr<EventFd> event_fd = |
| EventFd::OpenEventFile(selection.event_attr, tid, cpu, group_fd); |
| if (event_fd != nullptr) { |
| LOG(VERBOSE) << "OpenEventFile for " << event_fd->Name(); |
| event_fds.push_back(std::move(event_fd)); |
| } else { |
| if (failed_event_type != nullptr) { |
| *failed_event_type = selection.event_type_modifier.name; |
| return false; |
| } |
| } |
| if (group_fd == nullptr) { |
| group_fd = event_fd.get(); |
| } |
| } |
| for (size_t i = 0; i < group.size(); ++i) { |
| group[i].event_fds.push_back(std::move(event_fds[i])); |
| } |
| return true; |
| } |
| |
| static std::map<pid_t, std::set<pid_t>> PrepareThreads(const std::set<pid_t>& processes, |
| const std::set<pid_t>& threads) { |
| std::map<pid_t, std::set<pid_t>> result; |
| for (auto& pid : processes) { |
| std::vector<pid_t> tids = GetThreadsInProcess(pid); |
| std::set<pid_t>& threads_in_process = result[pid]; |
| threads_in_process.insert(tids.begin(), tids.end()); |
| } |
| for (auto& tid : threads) { |
| // tid = -1 means monitoring all threads. |
| if (tid == -1) { |
| result[-1].insert(-1); |
| } else { |
| pid_t pid; |
| if (GetProcessForThread(tid, &pid)) { |
| result[pid].insert(tid); |
| } |
| } |
| } |
| return result; |
| } |
| |
| bool EventSelectionSet::OpenEventFiles(const std::vector<int>& on_cpus) { |
| std::vector<int> cpus = on_cpus; |
| if (!cpus.empty()) { |
| // cpus = {-1} means open an event file for all cpus. |
| if (!(cpus.size() == 1 && cpus[0] == -1) && !CheckIfCpusOnline(cpus)) { |
| return false; |
| } |
| } else { |
| cpus = GetOnlineCpus(); |
| } |
| std::map<pid_t, std::set<pid_t>> process_map = PrepareThreads(processes_, threads_); |
| for (auto& group : groups_) { |
| if (IsUserSpaceSamplerGroup(group)) { |
| if (!OpenUserSpaceSamplersOnGroup(group, process_map)) { |
| return false; |
| } |
| } else { |
| for (const auto& pair : process_map) { |
| for (const auto& tid : pair.second) { |
| size_t success_cpu_count = 0; |
| std::string failed_event_type; |
| for (const auto& cpu : cpus) { |
| if (OpenEventFilesOnGroup(group, tid, cpu, &failed_event_type)) { |
| success_cpu_count++; |
| } |
| } |
| // As the online cpus can be enabled or disabled at runtime, we may not |
| // open event file for all cpus successfully. But we should open at |
| // least one cpu successfully. |
| if (success_cpu_count == 0) { |
| PLOG(ERROR) << "failed to open perf event file for event_type " |
| << failed_event_type << " for " |
| << (tid == -1 ? "all threads" : "thread " + std::to_string(tid)) |
| << " on all cpus"; |
| return false; |
| } |
| } |
| } |
| } |
| } |
| return true; |
| } |
| |
| bool EventSelectionSet::IsUserSpaceSamplerGroup(EventSelectionGroup& group) { |
| return group.size() == 1 && group[0].event_attr.type == SIMPLEPERF_TYPE_USER_SPACE_SAMPLERS; |
| } |
| |
| bool EventSelectionSet::OpenUserSpaceSamplersOnGroup(EventSelectionGroup& group, |
| const std::map<pid_t, std::set<pid_t>>& process_map) { |
| CHECK_EQ(group.size(), 1u); |
| for (auto& selection : group) { |
| if (selection.event_attr.type == SIMPLEPERF_TYPE_USER_SPACE_SAMPLERS && |
| selection.event_attr.config == SIMPLEPERF_CONFIG_INPLACE_SAMPLER) { |
| for (auto& pair : process_map) { |
| std::unique_ptr<InplaceSamplerClient> sampler = InplaceSamplerClient::Create( |
| selection.event_attr, pair.first, pair.second); |
| if (sampler == nullptr) { |
| return false; |
| } |
| selection.inplace_samplers.push_back(std::move(sampler)); |
| } |
| } |
| } |
| return true; |
| } |
| |
| static bool ReadCounter(EventFd* event_fd, CounterInfo* counter) { |
| if (!event_fd->ReadCounter(&counter->counter)) { |
| return false; |
| } |
| counter->tid = event_fd->ThreadId(); |
| counter->cpu = event_fd->Cpu(); |
| return true; |
| } |
| |
| bool EventSelectionSet::ReadCounters(std::vector<CountersInfo>* counters) { |
| counters->clear(); |
| for (size_t i = 0; i < groups_.size(); ++i) { |
| for (auto& selection : groups_[i]) { |
| CountersInfo counters_info; |
| counters_info.group_id = i; |
| counters_info.event_name = selection.event_type_modifier.event_type.name; |
| counters_info.event_modifier = selection.event_type_modifier.modifier; |
| counters_info.counters = selection.hotplugged_counters; |
| for (auto& event_fd : selection.event_fds) { |
| CounterInfo counter; |
| if (!ReadCounter(event_fd.get(), &counter)) { |
| return false; |
| } |
| counters_info.counters.push_back(counter); |
| } |
| counters->push_back(counters_info); |
| } |
| } |
| return true; |
| } |
| |
| bool EventSelectionSet::MmapEventFiles(size_t min_mmap_pages, |
| size_t max_mmap_pages) { |
| for (size_t i = max_mmap_pages; i >= min_mmap_pages; i >>= 1) { |
| if (MmapEventFiles(i, i == min_mmap_pages)) { |
| LOG(VERBOSE) << "Mapped buffer size is " << i << " pages."; |
| mmap_pages_ = i; |
| return true; |
| } |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| for (auto& event_fd : selection.event_fds) { |
| event_fd->DestroyMappedBuffer(); |
| } |
| } |
| } |
| } |
| return false; |
| } |
| |
| bool EventSelectionSet::MmapEventFiles(size_t mmap_pages, bool report_error) { |
| // Allocate a mapped buffer for each cpu. |
| std::map<int, EventFd*> cpu_map; |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| for (auto& event_fd : selection.event_fds) { |
| auto it = cpu_map.find(event_fd->Cpu()); |
| if (it != cpu_map.end()) { |
| if (!event_fd->ShareMappedBuffer(*(it->second), report_error)) { |
| return false; |
| } |
| } else { |
| if (!event_fd->CreateMappedBuffer(mmap_pages, report_error)) { |
| return false; |
| } |
| cpu_map[event_fd->Cpu()] = event_fd.get(); |
| } |
| } |
| } |
| } |
| return true; |
| } |
| |
| bool EventSelectionSet::PrepareToReadMmapEventData(const std::function<bool(Record*)>& callback) { |
| // Add read Events for perf event files having mapped buffer. |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| for (auto& event_fd : selection.event_fds) { |
| if (event_fd->HasMappedBuffer()) { |
| if (!event_fd->StartPolling(*loop_, [this]() { |
| return ReadMmapEventData(); |
| })) { |
| return false; |
| } |
| } |
| } |
| for (auto& sampler : selection.inplace_samplers) { |
| if (!sampler->StartPolling(*loop_, callback, |
| [&] { return CheckMonitoredTargets(); })) { |
| return false; |
| } |
| } |
| } |
| } |
| |
| // Prepare record callback function. |
| record_callback_ = callback; |
| return true; |
| } |
| |
| // When reading from mmap buffers, we prefer reading from all buffers at once |
| // rather than reading one buffer at a time. Because by reading all buffers |
| // at once, we can merge records from different buffers easily in memory. |
| // Otherwise, we have to sort records with greater effort. |
| bool EventSelectionSet::ReadMmapEventData() { |
| size_t head_size = 0; |
| std::vector<RecordBufferHead>& heads = record_buffer_heads_; |
| if (heads.empty()) { |
| heads.resize(1); |
| } |
| heads[0].current_pos = 0; |
| size_t buffer_pos = 0; |
| |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| for (auto& event_fd : selection.event_fds) { |
| if (event_fd->HasMappedBuffer()) { |
| if (event_fd->GetAvailableMmapData(record_buffer_, buffer_pos) != 0) { |
| heads[head_size].end_pos = buffer_pos; |
| heads[head_size].attr = &selection.event_attr; |
| head_size++; |
| if (heads.size() == head_size) { |
| heads.resize(head_size + 1); |
| } |
| heads[head_size].current_pos = buffer_pos; |
| } |
| } |
| } |
| } |
| } |
| |
| if (head_size == 0) { |
| return true; |
| } |
| if (head_size == 1) { |
| // Only one buffer has data, process it directly. |
| std::vector<std::unique_ptr<Record>> records = |
| ReadRecordsFromBuffer(*heads[0].attr, |
| record_buffer_.data(), buffer_pos); |
| for (auto& r : records) { |
| if (!record_callback_(r.get())) { |
| return false; |
| } |
| } |
| } else { |
| // Use a priority queue to merge records from different buffers. As |
| // records from the same buffer are already ordered by time, we only |
| // need to merge the first record from all buffers. And each time a |
| // record is popped from the queue, we put the next record from its |
| // buffer into the queue. |
| auto comparator = [&](RecordBufferHead* h1, RecordBufferHead* h2) { |
| return h1->timestamp > h2->timestamp; |
| }; |
| std::priority_queue<RecordBufferHead*, std::vector<RecordBufferHead*>, decltype(comparator)> q(comparator); |
| for (size_t i = 0; i < head_size; ++i) { |
| RecordBufferHead& h = heads[i]; |
| h.r = ReadRecordFromBuffer(*h.attr, &record_buffer_[h.current_pos]); |
| h.timestamp = h.r->Timestamp(); |
| h.current_pos += h.r->size(); |
| q.push(&h); |
| } |
| while (!q.empty()) { |
| RecordBufferHead* h = q.top(); |
| q.pop(); |
| if (!record_callback_(h->r.get())) { |
| return false; |
| } |
| if (h->current_pos < h->end_pos) { |
| h->r = ReadRecordFromBuffer(*h->attr, &record_buffer_[h->current_pos]); |
| h->timestamp = h->r->Timestamp(); |
| h->current_pos += h->r->size(); |
| q.push(h); |
| } |
| } |
| } |
| return true; |
| } |
| |
| bool EventSelectionSet::FinishReadMmapEventData() { |
| if (!ReadMmapEventData()) { |
| return false; |
| } |
| if (!HasInplaceSampler()) { |
| return true; |
| } |
| // Inplace sampler server uses a buffer to cache samples before sending them, so we need to |
| // explicitly ask it to send the cached samples. |
| loop_.reset(new IOEventLoop); |
| size_t inplace_sampler_count = 0; |
| auto close_callback = [&]() { |
| if (--inplace_sampler_count == 0) { |
| return loop_->ExitLoop(); |
| } |
| return true; |
| }; |
| for (auto& group : groups_) { |
| for (auto& sel : group) { |
| for (auto& sampler : sel.inplace_samplers) { |
| if (!sampler->IsClosed()) { |
| if (!sampler->StopProfiling(*loop_, close_callback)) { |
| return false; |
| } |
| inplace_sampler_count++; |
| } |
| } |
| } |
| } |
| if (inplace_sampler_count == 0) { |
| return true; |
| } |
| |
| // Set a timeout to exit the loop. |
| timeval tv; |
| tv.tv_sec = 1; |
| tv.tv_usec = 0; |
| if (!loop_->AddPeriodicEvent(tv, [&]() { return loop_->ExitLoop(); })) { |
| return false; |
| } |
| return loop_->RunLoop(); |
| } |
| |
| bool EventSelectionSet::HandleCpuHotplugEvents(const std::vector<int>& monitored_cpus, |
| double check_interval_in_sec) { |
| monitored_cpus_.insert(monitored_cpus.begin(), monitored_cpus.end()); |
| online_cpus_ = GetOnlineCpus(); |
| if (!loop_->AddPeriodicEvent(SecondToTimeval(check_interval_in_sec), |
| [&]() { return DetectCpuHotplugEvents(); })) { |
| return false; |
| } |
| return true; |
| } |
| |
| bool EventSelectionSet::DetectCpuHotplugEvents() { |
| std::vector<int> new_cpus = GetOnlineCpus(); |
| for (const auto& cpu : online_cpus_) { |
| if (std::find(new_cpus.begin(), new_cpus.end(), cpu) == new_cpus.end()) { |
| if (monitored_cpus_.empty() || |
| monitored_cpus_.find(cpu) != monitored_cpus_.end()) { |
| LOG(INFO) << "Cpu " << cpu << " is offlined"; |
| if (!HandleCpuOfflineEvent(cpu)) { |
| return false; |
| } |
| } |
| } |
| } |
| for (const auto& cpu : new_cpus) { |
| if (std::find(online_cpus_.begin(), online_cpus_.end(), cpu) == |
| online_cpus_.end()) { |
| if (monitored_cpus_.empty() || |
| monitored_cpus_.find(cpu) != monitored_cpus_.end()) { |
| LOG(INFO) << "Cpu " << cpu << " is onlined"; |
| if (!HandleCpuOnlineEvent(cpu)) { |
| return false; |
| } |
| } |
| } |
| } |
| online_cpus_ = new_cpus; |
| return true; |
| } |
| |
| bool EventSelectionSet::HandleCpuOfflineEvent(int cpu) { |
| if (!for_stat_cmd_) { |
| // Read mmap data here, so we won't lose the existing records of the |
| // offlined cpu. |
| if (!ReadMmapEventData()) { |
| return false; |
| } |
| } |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| for (auto it = selection.event_fds.begin(); |
| it != selection.event_fds.end();) { |
| if ((*it)->Cpu() == cpu) { |
| if (for_stat_cmd_) { |
| CounterInfo counter; |
| if (!ReadCounter(it->get(), &counter)) { |
| return false; |
| } |
| selection.hotplugged_counters.push_back(counter); |
| } else { |
| if ((*it)->HasMappedBuffer()) { |
| if (!(*it)->StopPolling()) { |
| return false; |
| } |
| } |
| } |
| it = selection.event_fds.erase(it); |
| } else { |
| ++it; |
| } |
| } |
| } |
| } |
| return true; |
| } |
| |
| bool EventSelectionSet::HandleCpuOnlineEvent(int cpu) { |
| // We need to start profiling when opening new event files. |
| SetEnableOnExec(false); |
| std::map<pid_t, std::set<pid_t>> process_map = PrepareThreads(processes_, threads_); |
| for (auto& group : groups_) { |
| if (IsUserSpaceSamplerGroup(group)) { |
| continue; |
| } |
| for (const auto& pair : process_map) { |
| for (const auto& tid : pair.second) { |
| std::string failed_event_type; |
| if (!OpenEventFilesOnGroup(group, tid, cpu, &failed_event_type)) { |
| // If failed to open event files, maybe the cpu has been offlined. |
| PLOG(WARNING) << "failed to open perf event file for event_type " |
| << failed_event_type << " for " |
| << (tid == -1 ? "all threads" : "thread " + std::to_string(tid)) |
| << " on cpu " << cpu; |
| } |
| } |
| } |
| } |
| if (!for_stat_cmd_) { |
| // Prepare mapped buffer. |
| if (!CreateMappedBufferForCpu(cpu)) { |
| return false; |
| } |
| // Send a EventIdRecord. |
| std::vector<uint64_t> event_id_data; |
| uint64_t attr_id = 0; |
| for (const auto& group : groups_) { |
| for (const auto& selection : group) { |
| for (const auto& event_fd : selection.event_fds) { |
| if (event_fd->Cpu() == cpu) { |
| event_id_data.push_back(attr_id); |
| event_id_data.push_back(event_fd->Id()); |
| } |
| } |
| ++attr_id; |
| } |
| } |
| EventIdRecord r(event_id_data); |
| if (!record_callback_(&r)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool EventSelectionSet::CreateMappedBufferForCpu(int cpu) { |
| EventFd* fd_with_buffer = nullptr; |
| for (auto& group : groups_) { |
| for (auto& selection : group) { |
| for (auto& event_fd : selection.event_fds) { |
| if (event_fd->Cpu() != cpu) { |
| continue; |
| } |
| if (fd_with_buffer == nullptr) { |
| if (!event_fd->CreateMappedBuffer(mmap_pages_, true)) { |
| return false; |
| } |
| fd_with_buffer = event_fd.get(); |
| } else { |
| if (!event_fd->ShareMappedBuffer(*fd_with_buffer, true)) { |
| fd_with_buffer->DestroyMappedBuffer(); |
| return false; |
| } |
| } |
| } |
| } |
| } |
| if (fd_with_buffer != nullptr && |
| !fd_with_buffer->StartPolling(*loop_, [this]() { |
| return ReadMmapEventData(); |
| })) { |
| return false; |
| } |
| return true; |
| } |
| |
| bool EventSelectionSet::StopWhenNoMoreTargets(double check_interval_in_sec) { |
| return loop_->AddPeriodicEvent(SecondToTimeval(check_interval_in_sec), |
| [&]() { return CheckMonitoredTargets(); }); |
| } |
| |
| bool EventSelectionSet::CheckMonitoredTargets() { |
| if (!HasSampler()) { |
| return loop_->ExitLoop(); |
| } |
| for (const auto& tid : threads_) { |
| if (IsThreadAlive(tid)) { |
| return true; |
| } |
| } |
| for (const auto& pid : processes_) { |
| if (IsThreadAlive(pid)) { |
| return true; |
| } |
| } |
| return loop_->ExitLoop(); |
| } |
| |
| bool EventSelectionSet::HasSampler() { |
| for (auto& group : groups_) { |
| for (auto& sel : group) { |
| if (!sel.event_fds.empty()) { |
| return true; |
| } |
| for (auto& sampler : sel.inplace_samplers) { |
| if (!sampler->IsClosed()) { |
| return true; |
| } |
| } |
| } |
| } |
| return false; |
| } |
