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"
21 #include <android-base/logging.h>
22 #include <android-base/stringprintf.h>
24 #include "environment.h"
25 #include "event_attr.h"
26 #include "event_type.h"
27 #include "perf_regs.h"
29 bool IsBranchSamplingSupported() {
30 const EventType* type = FindEventTypeByName("cpu-cycles");
31 if (type == nullptr) {
34 perf_event_attr attr = CreateDefaultPerfEventAttr(*type);
35 attr.sample_type |= PERF_SAMPLE_BRANCH_STACK;
36 attr.branch_sample_type = PERF_SAMPLE_BRANCH_ANY;
37 return IsEventAttrSupportedByKernel(attr);
40 bool IsDwarfCallChainSamplingSupported() {
41 const EventType* type = FindEventTypeByName("cpu-cycles");
42 if (type == nullptr) {
45 perf_event_attr attr = CreateDefaultPerfEventAttr(*type);
46 attr.sample_type |= PERF_SAMPLE_CALLCHAIN | PERF_SAMPLE_REGS_USER | PERF_SAMPLE_STACK_USER;
47 attr.exclude_callchain_user = 1;
48 attr.sample_regs_user = GetSupportedRegMask(GetBuildArch());
49 attr.sample_stack_user = 8192;
50 return IsEventAttrSupportedByKernel(attr);
53 bool EventSelectionSet::AddEventType(const EventTypeAndModifier& event_type_modifier) {
54 EventSelection selection;
55 selection.event_type_modifier = event_type_modifier;
56 selection.event_attr = CreateDefaultPerfEventAttr(event_type_modifier.event_type);
57 selection.event_attr.exclude_user = event_type_modifier.exclude_user;
58 selection.event_attr.exclude_kernel = event_type_modifier.exclude_kernel;
59 selection.event_attr.exclude_hv = event_type_modifier.exclude_hv;
60 selection.event_attr.exclude_host = event_type_modifier.exclude_host;
61 selection.event_attr.exclude_guest = event_type_modifier.exclude_guest;
62 selection.event_attr.precise_ip = event_type_modifier.precise_ip;
63 if (!IsEventAttrSupportedByKernel(selection.event_attr)) {
64 LOG(ERROR) << "Event type '" << event_type_modifier.name << "' is not supported by the kernel";
67 selections_.push_back(std::move(selection));
72 // Union the sample type of different event attrs can make reading sample records in perf.data
74 void EventSelectionSet::UnionSampleType() {
75 uint64_t sample_type = 0;
76 for (auto& selection : selections_) {
77 sample_type |= selection.event_attr.sample_type;
79 for (auto& selection : selections_) {
80 selection.event_attr.sample_type = sample_type;
84 void EventSelectionSet::SetEnableOnExec(bool enable) {
85 for (auto& selection : selections_) {
86 // If sampling is enabled on exec, then it is disabled at startup, otherwise
87 // it should be enabled at startup. Don't use ioctl(PERF_EVENT_IOC_ENABLE)
88 // to enable it after perf_event_open(). Because some android kernels can't
89 // handle ioctl() well when cpu-hotplug happens. See http://b/25193162.
91 selection.event_attr.enable_on_exec = 1;
92 selection.event_attr.disabled = 1;
94 selection.event_attr.enable_on_exec = 0;
95 selection.event_attr.disabled = 0;
100 bool EventSelectionSet::GetEnableOnExec() {
101 for (auto& selection : selections_) {
102 if (selection.event_attr.enable_on_exec == 0) {
109 void EventSelectionSet::SampleIdAll() {
110 for (auto& selection : selections_) {
111 selection.event_attr.sample_id_all = 1;
115 void EventSelectionSet::SetSampleFreq(uint64_t sample_freq) {
116 for (auto& selection : selections_) {
117 perf_event_attr& attr = selection.event_attr;
119 attr.sample_freq = sample_freq;
123 void EventSelectionSet::SetSamplePeriod(uint64_t sample_period) {
124 for (auto& selection : selections_) {
125 perf_event_attr& attr = selection.event_attr;
127 attr.sample_period = sample_period;
131 bool EventSelectionSet::SetBranchSampling(uint64_t branch_sample_type) {
132 if (branch_sample_type != 0 &&
133 (branch_sample_type & (PERF_SAMPLE_BRANCH_ANY | PERF_SAMPLE_BRANCH_ANY_CALL |
134 PERF_SAMPLE_BRANCH_ANY_RETURN | PERF_SAMPLE_BRANCH_IND_CALL)) == 0) {
135 LOG(ERROR) << "Invalid branch_sample_type: 0x" << std::hex << branch_sample_type;
138 if (branch_sample_type != 0 && !IsBranchSamplingSupported()) {
139 LOG(ERROR) << "branch stack sampling is not supported on this device.";
142 for (auto& selection : selections_) {
143 perf_event_attr& attr = selection.event_attr;
144 if (branch_sample_type != 0) {
145 attr.sample_type |= PERF_SAMPLE_BRANCH_STACK;
147 attr.sample_type &= ~PERF_SAMPLE_BRANCH_STACK;
149 attr.branch_sample_type = branch_sample_type;
154 void EventSelectionSet::EnableFpCallChainSampling() {
155 for (auto& selection : selections_) {
156 selection.event_attr.sample_type |= PERF_SAMPLE_CALLCHAIN;
160 bool EventSelectionSet::EnableDwarfCallChainSampling(uint32_t dump_stack_size) {
161 if (!IsDwarfCallChainSamplingSupported()) {
162 LOG(ERROR) << "dwarf callchain sampling is not supported on this device.";
165 for (auto& selection : selections_) {
166 selection.event_attr.sample_type |=
167 PERF_SAMPLE_CALLCHAIN | PERF_SAMPLE_REGS_USER | PERF_SAMPLE_STACK_USER;
168 selection.event_attr.exclude_callchain_user = 1;
169 selection.event_attr.sample_regs_user = GetSupportedRegMask(GetBuildArch());
170 selection.event_attr.sample_stack_user = dump_stack_size;
175 void EventSelectionSet::SetInherit(bool enable) {
176 for (auto& selection : selections_) {
177 selection.event_attr.inherit = (enable ? 1 : 0);
181 static bool CheckIfCpusOnline(const std::vector<int>& cpus) {
182 std::vector<int> online_cpus = GetOnlineCpus();
183 for (const auto& cpu : cpus) {
184 if (std::find(online_cpus.begin(), online_cpus.end(), cpu) == online_cpus.end()) {
185 LOG(ERROR) << "cpu " << cpu << " is not online.";
192 bool EventSelectionSet::OpenEventFilesForCpus(const std::vector<int>& cpus) {
193 return OpenEventFilesForThreadsOnCpus({-1}, cpus);
196 bool EventSelectionSet::OpenEventFilesForThreadsOnCpus(const std::vector<pid_t>& threads,
197 std::vector<int> cpus) {
199 if (!CheckIfCpusOnline(cpus)) {
203 cpus = GetOnlineCpus();
205 return OpenEventFiles(threads, cpus);
208 bool EventSelectionSet::OpenEventFiles(const std::vector<pid_t>& threads,
209 const std::vector<int>& cpus) {
210 for (auto& selection : selections_) {
211 for (auto& tid : threads) {
212 size_t open_per_thread = 0;
213 for (auto& cpu : cpus) {
214 auto event_fd = EventFd::OpenEventFile(selection.event_attr, tid, cpu);
215 if (event_fd != nullptr) {
216 LOG(VERBOSE) << "OpenEventFile for tid " << tid << ", cpu " << cpu;
217 selection.event_fds.push_back(std::move(event_fd));
221 // As the online cpus can be enabled or disabled at runtime, we may not open event file for
222 // all cpus successfully. But we should open at least one cpu successfully.
223 if (open_per_thread == 0) {
224 PLOG(ERROR) << "failed to open perf event file for event_type "
225 << selection.event_type_modifier.name << " for "
226 << (tid == -1 ? "all threads" : android::base::StringPrintf(" thread %d", tid));
234 bool EventSelectionSet::ReadCounters(std::vector<CountersInfo>* counters) {
236 for (auto& selection : selections_) {
237 CountersInfo counters_info;
238 counters_info.event_type = &selection.event_type_modifier;
239 for (auto& event_fd : selection.event_fds) {
240 CountersInfo::CounterInfo counter_info;
241 if (!event_fd->ReadCounter(&counter_info.counter)) {
244 counter_info.tid = event_fd->ThreadId();
245 counter_info.cpu = event_fd->Cpu();
246 counters_info.counters.push_back(counter_info);
248 counters->push_back(counters_info);
253 void EventSelectionSet::PreparePollForEventFiles(std::vector<pollfd>* pollfds) {
254 for (auto& selection : selections_) {
255 for (auto& event_fd : selection.event_fds) {
257 event_fd->PreparePollForMmapData(&poll_fd);
258 pollfds->push_back(poll_fd);
263 bool EventSelectionSet::MmapEventFiles(size_t mmap_pages) {
264 for (auto& selection : selections_) {
265 for (auto& event_fd : selection.event_fds) {
266 if (!event_fd->MmapContent(mmap_pages)) {
274 static bool ReadMmapEventDataForFd(std::unique_ptr<EventFd>& event_fd,
275 std::function<bool(const char*, size_t)> callback,
280 size_t size = event_fd->GetAvailableMmapData(&data);
284 if (!callback(data, size)) {
292 bool EventSelectionSet::ReadMmapEventData(std::function<bool(const char*, size_t)> callback) {
293 for (auto& selection : selections_) {
294 for (auto& event_fd : selection.event_fds) {
297 if (!ReadMmapEventDataForFd(event_fd, callback, &have_data)) {
309 EventSelectionSet::EventSelection* EventSelectionSet::FindSelectionByType(
310 const EventTypeAndModifier& event_type_modifier) {
311 for (auto& selection : selections_) {
312 if (selection.event_type_modifier.name == event_type_modifier.name) {
319 const perf_event_attr* EventSelectionSet::FindEventAttrByType(
320 const EventTypeAndModifier& event_type_modifier) {
321 EventSelection* selection = FindSelectionByType(event_type_modifier);
322 return (selection != nullptr) ? &selection->event_attr : nullptr;
325 const std::vector<std::unique_ptr<EventFd>>* EventSelectionSet::FindEventFdsByType(
326 const EventTypeAndModifier& event_type_modifier) {
327 EventSelection* selection = FindSelectionByType(event_type_modifier);
328 return (selection != nullptr) ? &selection->event_fds : nullptr;