2 * Copyright (C) 2015 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #include "event_selection_set.h"
19 #include <android-base/logging.h>
20 #include <android-base/stringprintf.h>
22 #include "environment.h"
23 #include "event_attr.h"
24 #include "event_type.h"
25 #include "perf_regs.h"
27 bool IsBranchSamplingSupported() {
28 const EventType* type = FindEventTypeByName("cpu-cycles");
29 if (type == nullptr) {
32 perf_event_attr attr = CreateDefaultPerfEventAttr(*type);
33 attr.sample_type |= PERF_SAMPLE_BRANCH_STACK;
34 attr.branch_sample_type = PERF_SAMPLE_BRANCH_ANY;
35 return IsEventAttrSupportedByKernel(attr);
38 bool IsDwarfCallChainSamplingSupported() {
39 const EventType* type = FindEventTypeByName("cpu-cycles");
40 if (type == nullptr) {
43 perf_event_attr attr = CreateDefaultPerfEventAttr(*type);
44 attr.sample_type |= PERF_SAMPLE_CALLCHAIN | PERF_SAMPLE_REGS_USER | PERF_SAMPLE_STACK_USER;
45 attr.exclude_callchain_user = 1;
46 attr.sample_regs_user = GetSupportedRegMask();
47 attr.sample_stack_user = 8192;
48 return IsEventAttrSupportedByKernel(attr);
51 bool EventSelectionSet::AddEventType(const EventTypeAndModifier& event_type_modifier) {
52 EventSelection selection;
53 selection.event_type_modifier = event_type_modifier;
54 selection.event_attr = CreateDefaultPerfEventAttr(event_type_modifier.event_type);
55 selection.event_attr.exclude_user = event_type_modifier.exclude_user;
56 selection.event_attr.exclude_kernel = event_type_modifier.exclude_kernel;
57 selection.event_attr.exclude_hv = event_type_modifier.exclude_hv;
58 selection.event_attr.exclude_host = event_type_modifier.exclude_host;
59 selection.event_attr.exclude_guest = event_type_modifier.exclude_guest;
60 selection.event_attr.precise_ip = event_type_modifier.precise_ip;
61 if (!IsEventAttrSupportedByKernel(selection.event_attr)) {
62 LOG(ERROR) << "Event type '" << event_type_modifier.name << "' is not supported by the kernel";
65 selections_.push_back(std::move(selection));
70 // Union the sample type of different event attrs can make reading sample records in perf.data
72 void EventSelectionSet::UnionSampleType() {
73 uint64_t sample_type = 0;
74 for (auto& selection : selections_) {
75 sample_type |= selection.event_attr.sample_type;
77 for (auto& selection : selections_) {
78 selection.event_attr.sample_type = sample_type;
82 void EventSelectionSet::SetEnableOnExec(bool enable) {
83 for (auto& selection : selections_) {
84 // If sampling is enabled on exec, then it is disabled at startup, otherwise
85 // it should be enabled at startup. Don't use ioctl(PERF_EVENT_IOC_ENABLE)
86 // to enable it after perf_event_open(). Because some android kernels can't
87 // handle ioctl() well when cpu-hotplug happens. See http://b/25193162.
89 selection.event_attr.enable_on_exec = 1;
90 selection.event_attr.disabled = 1;
92 selection.event_attr.enable_on_exec = 0;
93 selection.event_attr.disabled = 0;
98 bool EventSelectionSet::GetEnableOnExec() {
99 for (auto& selection : selections_) {
100 if (selection.event_attr.enable_on_exec == 0) {
107 void EventSelectionSet::SampleIdAll() {
108 for (auto& selection : selections_) {
109 selection.event_attr.sample_id_all = 1;
113 void EventSelectionSet::SetSampleFreq(uint64_t sample_freq) {
114 for (auto& selection : selections_) {
115 perf_event_attr& attr = selection.event_attr;
117 attr.sample_freq = sample_freq;
121 void EventSelectionSet::SetSamplePeriod(uint64_t sample_period) {
122 for (auto& selection : selections_) {
123 perf_event_attr& attr = selection.event_attr;
125 attr.sample_period = sample_period;
129 bool EventSelectionSet::SetBranchSampling(uint64_t branch_sample_type) {
130 if (branch_sample_type != 0 &&
131 (branch_sample_type & (PERF_SAMPLE_BRANCH_ANY | PERF_SAMPLE_BRANCH_ANY_CALL |
132 PERF_SAMPLE_BRANCH_ANY_RETURN | PERF_SAMPLE_BRANCH_IND_CALL)) == 0) {
133 LOG(ERROR) << "Invalid branch_sample_type: 0x" << std::hex << branch_sample_type;
136 if (branch_sample_type != 0 && !IsBranchSamplingSupported()) {
137 LOG(ERROR) << "branch stack sampling is not supported on this device.";
140 for (auto& selection : selections_) {
141 perf_event_attr& attr = selection.event_attr;
142 if (branch_sample_type != 0) {
143 attr.sample_type |= PERF_SAMPLE_BRANCH_STACK;
145 attr.sample_type &= ~PERF_SAMPLE_BRANCH_STACK;
147 attr.branch_sample_type = branch_sample_type;
152 void EventSelectionSet::EnableFpCallChainSampling() {
153 for (auto& selection : selections_) {
154 selection.event_attr.sample_type |= PERF_SAMPLE_CALLCHAIN;
158 bool EventSelectionSet::EnableDwarfCallChainSampling(uint32_t dump_stack_size) {
159 if (!IsDwarfCallChainSamplingSupported()) {
160 LOG(ERROR) << "dwarf callchain sampling is not supported on this device.";
163 for (auto& selection : selections_) {
164 selection.event_attr.sample_type |=
165 PERF_SAMPLE_CALLCHAIN | PERF_SAMPLE_REGS_USER | PERF_SAMPLE_STACK_USER;
166 selection.event_attr.exclude_callchain_user = 1;
167 selection.event_attr.sample_regs_user = GetSupportedRegMask();
168 selection.event_attr.sample_stack_user = dump_stack_size;
173 void EventSelectionSet::SetInherit(bool enable) {
174 for (auto& selection : selections_) {
175 selection.event_attr.inherit = (enable ? 1 : 0);
179 static bool CheckIfCpusOnline(const std::vector<int>& cpus) {
180 std::vector<int> online_cpus = GetOnlineCpus();
181 for (const auto& cpu : cpus) {
182 if (std::find(online_cpus.begin(), online_cpus.end(), cpu) == online_cpus.end()) {
183 LOG(ERROR) << "cpu " << cpu << " is not online.";
190 bool EventSelectionSet::OpenEventFilesForCpus(const std::vector<int>& cpus) {
191 return OpenEventFilesForThreadsOnCpus({-1}, cpus);
194 bool EventSelectionSet::OpenEventFilesForThreadsOnCpus(const std::vector<pid_t>& threads,
195 std::vector<int> cpus) {
197 if (!CheckIfCpusOnline(cpus)) {
201 cpus = GetOnlineCpus();
203 return OpenEventFiles(threads, cpus);
206 bool EventSelectionSet::OpenEventFiles(const std::vector<pid_t>& threads,
207 const std::vector<int>& cpus) {
208 for (auto& selection : selections_) {
209 for (auto& tid : threads) {
210 size_t open_per_thread = 0;
211 for (auto& cpu : cpus) {
212 auto event_fd = EventFd::OpenEventFile(selection.event_attr, tid, cpu);
213 if (event_fd != nullptr) {
214 LOG(VERBOSE) << "OpenEventFile for tid " << tid << ", cpu " << cpu;
215 selection.event_fds.push_back(std::move(event_fd));
219 // As the online cpus can be enabled or disabled at runtime, we may not open event file for
220 // all cpus successfully. But we should open at least one cpu successfully.
221 if (open_per_thread == 0) {
222 PLOG(ERROR) << "failed to open perf event file for event_type "
223 << selection.event_type_modifier.name << " for "
224 << (tid == -1 ? "all threads" : android::base::StringPrintf(" thread %d", tid));
232 bool EventSelectionSet::ReadCounters(std::vector<CountersInfo>* counters) {
234 for (auto& selection : selections_) {
235 CountersInfo counters_info;
236 counters_info.event_type = &selection.event_type_modifier;
237 for (auto& event_fd : selection.event_fds) {
238 CountersInfo::CounterInfo counter_info;
239 if (!event_fd->ReadCounter(&counter_info.counter)) {
242 counter_info.tid = event_fd->ThreadId();
243 counter_info.cpu = event_fd->Cpu();
244 counters_info.counters.push_back(counter_info);
246 counters->push_back(counters_info);
251 void EventSelectionSet::PreparePollForEventFiles(std::vector<pollfd>* pollfds) {
252 for (auto& selection : selections_) {
253 for (auto& event_fd : selection.event_fds) {
255 event_fd->PreparePollForMmapData(&poll_fd);
256 pollfds->push_back(poll_fd);
261 bool EventSelectionSet::MmapEventFiles(size_t mmap_pages) {
262 for (auto& selection : selections_) {
263 for (auto& event_fd : selection.event_fds) {
264 if (!event_fd->MmapContent(mmap_pages)) {
272 static bool ReadMmapEventDataForFd(std::unique_ptr<EventFd>& event_fd,
273 std::function<bool(const char*, size_t)> callback,
278 size_t size = event_fd->GetAvailableMmapData(&data);
282 if (!callback(data, size)) {
290 bool EventSelectionSet::ReadMmapEventData(std::function<bool(const char*, size_t)> callback) {
291 for (auto& selection : selections_) {
292 for (auto& event_fd : selection.event_fds) {
295 if (!ReadMmapEventDataForFd(event_fd, callback, &have_data)) {
307 EventSelectionSet::EventSelection* EventSelectionSet::FindSelectionByType(
308 const EventTypeAndModifier& event_type_modifier) {
309 for (auto& selection : selections_) {
310 if (selection.event_type_modifier.name == event_type_modifier.name) {
317 const perf_event_attr* EventSelectionSet::FindEventAttrByType(
318 const EventTypeAndModifier& event_type_modifier) {
319 EventSelection* selection = FindSelectionByType(event_type_modifier);
320 return (selection != nullptr) ? &selection->event_attr : nullptr;
323 const std::vector<std::unique_ptr<EventFd>>* EventSelectionSet::FindEventFdsByType(
324 const EventTypeAndModifier& event_type_modifier) {
325 EventSelection* selection = FindSelectionByType(event_type_modifier);
326 return (selection != nullptr) ? &selection->event_fds : nullptr;