Yabin Cui | ed91cd9 | 2015-04-28 15:54:13 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2015 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "event_selection_set.h" |
| 18 | |
| 19 | #include <base/logging.h> |
| 20 | |
| 21 | #include "environment.h" |
| 22 | #include "event_attr.h" |
| 23 | #include "event_type.h" |
| 24 | |
| 25 | void EventSelectionSet::AddEventType(const EventType& event_type) { |
| 26 | EventSelection selection; |
| 27 | selection.event_type = &event_type; |
| 28 | selection.event_attr = CreateDefaultPerfEventAttr(event_type); |
| 29 | selections_.push_back(std::move(selection)); |
| 30 | } |
| 31 | |
| 32 | void EventSelectionSet::EnableOnExec() { |
| 33 | for (auto& selection : selections_) { |
| 34 | selection.event_attr.enable_on_exec = 1; |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | void EventSelectionSet::SampleIdAll() { |
| 39 | for (auto& selection : selections_) { |
| 40 | selection.event_attr.sample_id_all = 1; |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | void EventSelectionSet::SetSampleFreq(uint64_t sample_freq) { |
| 45 | for (auto& selection : selections_) { |
| 46 | perf_event_attr& attr = selection.event_attr; |
| 47 | attr.freq = 1; |
| 48 | attr.sample_freq = sample_freq; |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | void EventSelectionSet::SetSamplePeriod(uint64_t sample_period) { |
| 53 | for (auto& selection : selections_) { |
| 54 | perf_event_attr& attr = selection.event_attr; |
| 55 | attr.freq = 0; |
| 56 | attr.sample_period = sample_period; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | bool EventSelectionSet::OpenEventFilesForAllCpus() { |
| 61 | std::vector<int> cpus = GetOnlineCpus(); |
| 62 | if (cpus.empty()) { |
| 63 | return false; |
| 64 | } |
| 65 | for (auto& selection : selections_) { |
| 66 | for (auto& cpu : cpus) { |
| 67 | auto event_fd = EventFd::OpenEventFileForCpu(selection.event_attr, cpu); |
| 68 | if (event_fd != nullptr) { |
| 69 | selection.event_fds.push_back(std::move(event_fd)); |
| 70 | } |
| 71 | } |
| 72 | // As the online cpus can be enabled or disabled at runtime, we may not open event file for |
| 73 | // all cpus successfully. But we should open at least one cpu successfully. |
| 74 | if (selection.event_fds.empty()) { |
| 75 | LOG(ERROR) << "failed to open perf event file for event_type " << selection.event_type->name |
| 76 | << " on all cpus"; |
| 77 | return false; |
| 78 | } |
| 79 | } |
| 80 | return true; |
| 81 | } |
| 82 | |
| 83 | bool EventSelectionSet::OpenEventFilesForProcess(pid_t pid) { |
| 84 | for (auto& selection : selections_) { |
| 85 | auto event_fd = EventFd::OpenEventFileForProcess(selection.event_attr, pid); |
| 86 | if (event_fd == nullptr) { |
| 87 | PLOG(ERROR) << "failed to open perf event file for event type " << selection.event_type->name |
| 88 | << " on pid " << pid; |
| 89 | return false; |
| 90 | } |
| 91 | selection.event_fds.push_back(std::move(event_fd)); |
| 92 | } |
| 93 | return true; |
| 94 | } |
| 95 | |
| 96 | bool EventSelectionSet::EnableEvents() { |
| 97 | for (auto& selection : selections_) { |
| 98 | for (auto& event_fd : selection.event_fds) { |
| 99 | if (!event_fd->EnableEvent()) { |
| 100 | return false; |
| 101 | } |
| 102 | } |
| 103 | } |
| 104 | return true; |
| 105 | } |
| 106 | |
| 107 | bool EventSelectionSet::ReadCounters( |
| 108 | std::map<const EventType*, std::vector<PerfCounter>>* counters_map) { |
| 109 | for (auto& selection : selections_) { |
| 110 | std::vector<PerfCounter> counters; |
| 111 | for (auto& event_fd : selection.event_fds) { |
| 112 | PerfCounter counter; |
| 113 | if (!event_fd->ReadCounter(&counter)) { |
| 114 | return false; |
| 115 | } |
| 116 | counters.push_back(counter); |
| 117 | } |
| 118 | counters_map->insert(std::make_pair(selection.event_type, counters)); |
| 119 | } |
| 120 | return true; |
| 121 | } |
| 122 | |
| 123 | void EventSelectionSet::PreparePollForEventFiles(std::vector<pollfd>* pollfds) { |
| 124 | for (auto& selection : selections_) { |
| 125 | for (auto& event_fd : selection.event_fds) { |
| 126 | pollfd poll_fd; |
| 127 | event_fd->PreparePollForMmapData(&poll_fd); |
| 128 | pollfds->push_back(poll_fd); |
| 129 | } |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | bool EventSelectionSet::MmapEventFiles(size_t mmap_pages) { |
| 134 | for (auto& selection : selections_) { |
| 135 | for (auto& event_fd : selection.event_fds) { |
| 136 | if (!event_fd->MmapContent(mmap_pages)) { |
| 137 | return false; |
| 138 | } |
| 139 | } |
| 140 | } |
| 141 | return true; |
| 142 | } |
| 143 | |
| 144 | static bool ReadMmapEventDataForFd(std::unique_ptr<EventFd>& event_fd, |
| 145 | std::function<bool(const char*, size_t)> callback, |
| 146 | bool* have_data) { |
| 147 | *have_data = false; |
| 148 | while (true) { |
| 149 | char* data; |
| 150 | size_t size = event_fd->GetAvailableMmapData(&data); |
| 151 | if (size == 0) { |
| 152 | break; |
| 153 | } |
| 154 | if (!callback(data, size)) { |
| 155 | return false; |
| 156 | } |
| 157 | *have_data = true; |
| 158 | event_fd->DiscardMmapData(size); |
| 159 | } |
| 160 | return true; |
| 161 | } |
| 162 | |
| 163 | bool EventSelectionSet::ReadMmapEventData(std::function<bool(const char*, size_t)> callback) { |
| 164 | for (auto& selection : selections_) { |
| 165 | for (auto& event_fd : selection.event_fds) { |
| 166 | while (true) { |
| 167 | bool have_data; |
| 168 | if (!ReadMmapEventDataForFd(event_fd, callback, &have_data)) { |
| 169 | return false; |
| 170 | } |
| 171 | if (!have_data) { |
| 172 | break; |
| 173 | } |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | return true; |
| 178 | } |
| 179 | |
| 180 | std::string EventSelectionSet::FindEventFileNameById(uint64_t id) { |
| 181 | for (auto& selection : selections_) { |
| 182 | for (auto& event_fd : selection.event_fds) { |
| 183 | if (event_fd->Id() == id) { |
| 184 | return event_fd->Name(); |
| 185 | } |
| 186 | } |
| 187 | } |
| 188 | return ""; |
| 189 | } |
| 190 | |
| 191 | EventSelectionSet::EventSelection* EventSelectionSet::FindSelectionByType( |
| 192 | const EventType& event_type) { |
| 193 | for (auto& selection : selections_) { |
| 194 | if (strcmp(selection.event_type->name, event_type.name) == 0) { |
| 195 | return &selection; |
| 196 | } |
| 197 | } |
| 198 | return nullptr; |
| 199 | } |
| 200 | |
| 201 | const perf_event_attr& EventSelectionSet::FindEventAttrByType(const EventType& event_type) { |
| 202 | return FindSelectionByType(event_type)->event_attr; |
| 203 | } |
| 204 | |
| 205 | const std::vector<std::unique_ptr<EventFd>>& EventSelectionSet::FindEventFdsByType( |
| 206 | const EventType& event_type) { |
| 207 | return FindSelectionByType(event_type)->event_fds; |
| 208 | } |