362 lines
10 KiB
C++
362 lines
10 KiB
C++
/*
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* Copyright (C) 2017 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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#include "inplace_sampler_lib.h"
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#include <inttypes.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/syscall.h>
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#include <sys/ucontext.h>
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#include <unistd.h>
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#include <map>
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#include <memory>
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#include <queue>
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#include <set>
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#include <string>
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#include <unordered_map>
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#include <android-base/logging.h>
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#include <android-base/macros.h>
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#include <backtrace/Backtrace.h>
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#define LOG_TAG "InplaceSampler"
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#include <log/log.h>
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#include "environment.h"
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#include "UnixSocket.h"
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#include "utils.h"
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#define DEFAULT_SIGNO SIGRTMAX
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static constexpr int DEFAULT_SAMPLE_FREQ = 4000;
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static constexpr int CHECK_THREADS_INTERVAL_IN_MS = 200;
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namespace {
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struct ThreadInfo {
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std::string name;
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};
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// SampleManager controls the whole sampling process:
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// Read commands from simpleperf
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// Set up timers to send signals for each profiled thread regularly.
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// Send thread info and map info to simpleperf.
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class SampleManager {
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public:
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SampleManager(std::unique_ptr<UnixSocketConnection> conn) : conn_(std::move(conn)),
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tid_(gettid()), signo_(DEFAULT_SIGNO), sample_freq_(DEFAULT_SAMPLE_FREQ),
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sample_period_in_ns_(0), dump_callchain_(false), monitor_all_threads_(true) {
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}
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void Run();
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private:
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bool HandleMessage(const UnixSocketMessage& msg);
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bool ParseStartProfilingMessage(const UnixSocketMessage& msg);
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bool SendStartProfilingReplyMessage(bool ok);
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bool StartProfiling();
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bool InstallSignalHandler();
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bool CheckThreads();
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bool CheckThreadNameChange(uint64_t timestamp);
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bool CheckMapChange(uint64_t timestamp);
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void SendThreadMapInfo();
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void SendFakeSampleRecord();
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std::unique_ptr<UnixSocketConnection> conn_;
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int tid_;
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int signo_;
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uint32_t sample_freq_;
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uint32_t sample_period_in_ns_;
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bool dump_callchain_;
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bool monitor_all_threads_;
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std::set<int> monitor_tid_filter_;
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std::map<int, ThreadInfo> threads_;
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std::map<uint64_t, ThreadMmap> maps_;
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std::queue<std::unique_ptr<char[]>> thread_map_info_q_;
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IOEventLoop loop_;
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};
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void SampleManager::Run() {
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auto read_callback = [&](const UnixSocketMessage& msg) {
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return HandleMessage(msg);
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};
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auto close_callback = [&]() {
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return loop_.ExitLoop();
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};
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if (!conn_->PrepareForIO(loop_, read_callback, close_callback)) {
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return;
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}
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loop_.RunLoop();
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}
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bool SampleManager::HandleMessage(const UnixSocketMessage& msg) {
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if (msg.type == START_PROFILING) {
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if (!ParseStartProfilingMessage(msg)) {
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if (!SendStartProfilingReplyMessage(false)) {
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return false;
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}
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return conn_->NoMoreMessage();
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}
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if (!SendStartProfilingReplyMessage(true)) {
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return false;
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}
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return StartProfiling();
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}
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if (msg.type == END_PROFILING) {
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// Close connection after clearing send buffer.
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return conn_->NoMoreMessage();
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}
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LOG(ERROR) << "Unexpected msg type: " << msg.type;
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return false;
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}
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bool SampleManager::ParseStartProfilingMessage(const UnixSocketMessage& msg) {
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char* option = const_cast<char*>(msg.data);
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while (option != nullptr && *option != '\0') {
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char* next_option = strchr(option, ' ');
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if (next_option != nullptr) {
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*next_option++ = '\0';
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}
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char* equal_op = strchr(option, '=');
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if (equal_op != nullptr) {
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char* key = option;
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*equal_op = '\0';
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char* value = equal_op + 1;
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if (strcmp(key, "freq") == 0) {
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sample_freq_ = atoi(value);
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} else if (strcmp(key, "signal") == 0) {
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signo_ = atoi(value);
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} else if (strcmp(key, "tids") == 0) {
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monitor_all_threads_ = false;
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while (*value != '\0') {
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int tid = static_cast<int>(strtol(value, &value, 10));
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monitor_tid_filter_.insert(tid);
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if (*value == ',') {
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++value;
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}
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}
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} else if (strcmp(key, "dump_callchain") == 0) {
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dump_callchain_ = (strcmp(value, "1") == 0);
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}
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}
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option = next_option;
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}
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if (sample_freq_ == 0 || sample_freq_ > 1000000000) {
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LOG(ERROR) << "Unexpected sample_freq: " << sample_freq_;
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return false;
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}
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if (sample_freq_ == 1) {
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sample_period_in_ns_ = 999999999;
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} else {
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sample_period_in_ns_ = 1000000000 / sample_freq_;
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}
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return true;
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}
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bool SampleManager::SendStartProfilingReplyMessage(bool ok) {
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const char* s = ok ? "ok" : "error";
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size_t size = sizeof(UnixSocketMessage) + strlen(s) + 1;
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std::unique_ptr<char[]> data(new char[size]);
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UnixSocketMessage* msg = reinterpret_cast<UnixSocketMessage*>(data.get());
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msg->len = size;
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msg->type = START_PROFILING_REPLY;
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strcpy(msg->data, s);
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return conn_->SendMessage(*msg, true);
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}
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bool SampleManager::StartProfiling() {
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if (!InstallSignalHandler()) {
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return false;
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}
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if (!CheckThreads()) {
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return false;
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}
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timeval tv;
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tv.tv_sec = CHECK_THREADS_INTERVAL_IN_MS / 1000;
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tv.tv_usec = CHECK_THREADS_INTERVAL_IN_MS % 1000 * 1000;
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return loop_.AddPeriodicEvent(tv, [&]() {
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return CheckThreads();
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});
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}
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bool SampleManager::InstallSignalHandler() {
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return true;
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}
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bool SampleManager::CheckThreads() {
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uint64_t timestamp = GetSystemClock();
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if (!CheckMapChange(timestamp)) {
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return false;
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}
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if (!CheckThreadNameChange(timestamp)) {
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return false;
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}
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SendThreadMapInfo();
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// For testing.
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SendFakeSampleRecord();
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return true;
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}
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bool SampleManager::CheckThreadNameChange(uint64_t timestamp) {
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std::vector<pid_t> tids = GetThreadsInProcess(getpid());
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std::map<pid_t, std::string> current;
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for (auto& tid : tids) {
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if (tid == tid_) {
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// Skip sample thread.
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continue;
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}
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if (monitor_all_threads_ || monitor_tid_filter_.find(tid) != monitor_tid_filter_.end()) {
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std::string name;
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if (GetThreadName(tid, &name)) {
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current[tid] = name;
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}
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}
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}
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// Check new threads or threads with new names.
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for (auto& pair : current) {
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pid_t tid = pair.first;
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auto it = threads_.find(tid);
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if (it == threads_.end() || it->second.name != pair.second) {
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threads_[tid].name = pair.second;
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size_t size = sizeof(UnixSocketMessage) + sizeof(uint64_t) + sizeof(uint32_t) +
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pair.second.size() + 1;
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std::unique_ptr<char[]> data(new char[size]);
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UnixSocketMessage* msg = reinterpret_cast<UnixSocketMessage*>(data.get());
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msg->len = size;
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msg->type = THREAD_INFO;
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char* p = msg->data;
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MoveToBinaryFormat(timestamp, p);
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MoveToBinaryFormat(static_cast<uint32_t>(tid), p);
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MoveToBinaryFormat(pair.second.c_str(), pair.second.size() + 1, p);
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thread_map_info_q_.push(std::move(data));
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}
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}
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// Check deleted threads.
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for (auto it = threads_.begin(); it != threads_.end();) {
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int tid = it->first;
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if (current.find(tid) == current.end()) {
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it = threads_.erase(it);
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} else {
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++it;
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}
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}
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return true;
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}
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bool SampleManager::CheckMapChange(uint64_t timestamp) {
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std::vector<ThreadMmap> maps;
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if (!GetThreadMmapsInProcess(getpid(), &maps)) {
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return false;
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}
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// Check new maps or changed maps.
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for (auto& map : maps) {
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if (!map.executable) {
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continue;
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}
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auto it = maps_.find(map.start_addr);
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if (it == maps_.end() || it->second.len != map.len || it->second.pgoff != map.pgoff ||
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it->second.name != map.name) {
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maps_[map.start_addr] = map;
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size_t size = sizeof(UnixSocketMessage) + sizeof(uint64_t) * 4 + map.name.size() + 1;
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std::unique_ptr<char[]> data(new char[size]);
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UnixSocketMessage* msg = reinterpret_cast<UnixSocketMessage*>(data.get());
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msg->len = size;
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msg->type = MAP_INFO;
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char* p = msg->data;
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MoveToBinaryFormat(timestamp, p);
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MoveToBinaryFormat(map.start_addr, p);
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MoveToBinaryFormat(map.len, p);
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MoveToBinaryFormat(map.pgoff, p);
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MoveToBinaryFormat(map.name.c_str(), map.name.size() + 1, p);
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thread_map_info_q_.push(std::move(data));
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}
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}
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return true;
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}
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void SampleManager::SendThreadMapInfo() {
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while (!thread_map_info_q_.empty()) {
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auto& data = thread_map_info_q_.front();
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UnixSocketMessage* msg = reinterpret_cast<UnixSocketMessage*>(data.get());
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if (!conn_->SendMessage(*msg, false)) {
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break;
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}
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thread_map_info_q_.pop();
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}
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}
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static void FakeFunction() {
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}
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void SampleManager::SendFakeSampleRecord() {
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size_t size = sizeof(UnixSocketMessage) + sizeof(uint64_t) * 2 + sizeof(uint32_t) * 3;
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std::unique_ptr<char[]> data(new char[size]);
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UnixSocketMessage* msg = reinterpret_cast<UnixSocketMessage*>(data.get());
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uint64_t ip = static_cast<uint64_t>(reinterpret_cast<uintptr_t>(&FakeFunction));
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msg->len = size;
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msg->type = SAMPLE_INFO;
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char* p = msg->data;
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MoveToBinaryFormat(GetSystemClock(), p);
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MoveToBinaryFormat(static_cast<uint32_t>(tid_), p);
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MoveToBinaryFormat(1u, p);
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MoveToBinaryFormat(1u, p);
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MoveToBinaryFormat(ip, p);
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conn_->SendMessage(*msg, false);
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}
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static void* CommunicationThread(void*) {
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pthread_setname_np(pthread_self(), "inplace_sampler");
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std::string server_path = "inplace_sampler_server_" + std::to_string(getpid());
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std::unique_ptr<UnixSocketServer> server = UnixSocketServer::Create(server_path, true);
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if (server == nullptr) {
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LOG(ERROR) << "failed to create server at path " << server_path;
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return nullptr;
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}
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LOG(INFO) << "Create inplace_sampler_server at " << server_path;
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while (true) {
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std::unique_ptr<UnixSocketConnection> conn = server->AcceptConnection();
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if (conn == nullptr) {
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break;
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}
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SampleManager manager(std::move(conn));
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manager.Run();
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}
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return nullptr;
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}
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__attribute__((constructor)) void InitSampler() {
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pthread_attr_t attr;
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if (pthread_attr_init(&attr) != 0) {
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LOG(ERROR) << "pthread_attr_init failed";
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return;
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}
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if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) {
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LOG(ERROR) << "pthread_attr_setdetachstate failed";
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return;
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}
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pthread_t thread;
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if (pthread_create(&thread, &attr, CommunicationThread, nullptr) != 0) {
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LOG(ERROR) << "pthread_create failed";
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return;
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}
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pthread_attr_destroy(&attr);
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}
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} // namespace
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