| /* |
| * 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 "thread_tree.h" |
| |
| #include <base/logging.h> |
| #include "environment.h" |
| #include "perf_event.h" |
| #include "record.h" |
| |
| bool MapComparator::operator()(const MapEntry* map1, const MapEntry* map2) const { |
| if (map1->start_addr != map2->start_addr) { |
| return map1->start_addr < map2->start_addr; |
| } |
| if (map1->len != map2->len) { |
| return map1->len < map2->len; |
| } |
| if (map1->time != map2->time) { |
| return map1->time < map2->time; |
| } |
| return false; |
| } |
| |
| void ThreadTree::AddThread(int pid, int tid, const std::string& comm) { |
| auto it = thread_tree_.find(tid); |
| if (it == thread_tree_.end()) { |
| ThreadEntry* thread = new ThreadEntry{ |
| pid, tid, |
| "unknown", // comm |
| std::set<MapEntry*, MapComparator>(), // maps |
| }; |
| auto pair = thread_tree_.insert(std::make_pair(tid, std::unique_ptr<ThreadEntry>(thread))); |
| CHECK(pair.second); |
| it = pair.first; |
| } |
| thread_comm_storage_.push_back(std::unique_ptr<std::string>(new std::string(comm))); |
| it->second->comm = thread_comm_storage_.back()->c_str(); |
| } |
| |
| void ThreadTree::ForkThread(int pid, int tid, int ppid, int ptid) { |
| ThreadEntry* parent = FindThreadOrNew(ppid, ptid); |
| ThreadEntry* child = FindThreadOrNew(pid, tid); |
| child->comm = parent->comm; |
| child->maps = parent->maps; |
| } |
| |
| ThreadEntry* ThreadTree::FindThreadOrNew(int pid, int tid) { |
| auto it = thread_tree_.find(tid); |
| if (it == thread_tree_.end()) { |
| AddThread(pid, tid, "unknown"); |
| it = thread_tree_.find(tid); |
| } else { |
| CHECK_EQ(pid, it->second.get()->pid) << "tid = " << tid; |
| } |
| return it->second.get(); |
| } |
| |
| static void RemoveOverlappedMap(std::set<MapEntry*, MapComparator>* map_set, const MapEntry* map) { |
| for (auto it = map_set->begin(); it != map_set->end();) { |
| if ((*it)->start_addr >= map->start_addr + map->len) { |
| break; |
| } |
| if ((*it)->start_addr + (*it)->len <= map->start_addr) { |
| ++it; |
| } else { |
| it = map_set->erase(it); |
| } |
| } |
| } |
| |
| void ThreadTree::AddKernelMap(uint64_t start_addr, uint64_t len, uint64_t pgoff, uint64_t time, |
| const std::string& filename) { |
| // kernel map len can be 0 when record command is not run in supervisor mode. |
| if (len == 0) { |
| return; |
| } |
| DsoEntry* dso = FindKernelDsoOrNew(filename); |
| MapEntry* map = new MapEntry{ |
| start_addr, len, pgoff, time, dso, |
| }; |
| map_storage_.push_back(std::unique_ptr<MapEntry>(map)); |
| RemoveOverlappedMap(&kernel_map_tree_, map); |
| auto pair = kernel_map_tree_.insert(map); |
| CHECK(pair.second); |
| } |
| |
| DsoEntry* ThreadTree::FindKernelDsoOrNew(const std::string& filename) { |
| if (filename == DEFAULT_KERNEL_MMAP_NAME) { |
| if (kernel_dso_ == nullptr) { |
| kernel_dso_ = DsoFactory::GetInstance()->CreateDso(DSO_KERNEL); |
| } |
| return kernel_dso_.get(); |
| } |
| auto it = module_dso_tree_.find(filename); |
| if (it == module_dso_tree_.end()) { |
| module_dso_tree_[filename] = DsoFactory::GetInstance()->CreateDso(DSO_KERNEL_MODULE, filename); |
| it = module_dso_tree_.find(filename); |
| } |
| return it->second.get(); |
| } |
| |
| void ThreadTree::AddThreadMap(int pid, int tid, uint64_t start_addr, uint64_t len, uint64_t pgoff, |
| uint64_t time, const std::string& filename) { |
| ThreadEntry* thread = FindThreadOrNew(pid, tid); |
| DsoEntry* dso = FindUserDsoOrNew(filename); |
| MapEntry* map = new MapEntry{ |
| start_addr, len, pgoff, time, dso, |
| }; |
| map_storage_.push_back(std::unique_ptr<MapEntry>(map)); |
| RemoveOverlappedMap(&thread->maps, map); |
| auto pair = thread->maps.insert(map); |
| CHECK(pair.second); |
| } |
| |
| DsoEntry* ThreadTree::FindUserDsoOrNew(const std::string& filename) { |
| auto it = user_dso_tree_.find(filename); |
| if (it == user_dso_tree_.end()) { |
| user_dso_tree_[filename] = DsoFactory::GetInstance()->CreateDso(DSO_ELF_FILE, filename); |
| it = user_dso_tree_.find(filename); |
| } |
| return it->second.get(); |
| } |
| |
| static bool IsAddrInMap(uint64_t addr, const MapEntry* map) { |
| return (addr >= map->start_addr && addr < map->start_addr + map->len); |
| } |
| |
| static MapEntry* FindMapByAddr(const std::set<MapEntry*, MapComparator>& maps, uint64_t addr) { |
| // Construct a map_entry which is strictly after the searched map_entry, based on MapComparator. |
| MapEntry find_map = { |
| addr, // start_addr |
| ULLONG_MAX, // len |
| 0, // pgoff |
| ULLONG_MAX, // time |
| nullptr, // dso |
| }; |
| auto it = maps.upper_bound(&find_map); |
| if (it != maps.begin() && IsAddrInMap(addr, *--it)) { |
| return *it; |
| } |
| return nullptr; |
| } |
| |
| const MapEntry* ThreadTree::FindMap(const ThreadEntry* thread, uint64_t ip, bool in_kernel) { |
| MapEntry* result = nullptr; |
| if (!in_kernel) { |
| result = FindMapByAddr(thread->maps, ip); |
| } else { |
| result = FindMapByAddr(kernel_map_tree_, ip); |
| } |
| return result != nullptr ? result : &unknown_map_; |
| } |
| |
| const SymbolEntry* ThreadTree::FindSymbol(const MapEntry* map, uint64_t ip) { |
| uint64_t offset_in_file; |
| if (map->dso == kernel_dso_.get()) { |
| offset_in_file = ip; |
| } else { |
| offset_in_file = ip - map->start_addr + map->pgoff; |
| } |
| const SymbolEntry* symbol = map->dso->FindSymbol(offset_in_file); |
| if (symbol == nullptr) { |
| symbol = &unknown_symbol_; |
| } |
| return symbol; |
| } |
| |
| void BuildThreadTree(const std::vector<std::unique_ptr<Record>>& records, ThreadTree* thread_tree) { |
| for (auto& record : records) { |
| if (record->header.type == PERF_RECORD_MMAP) { |
| const MmapRecord& r = *static_cast<const MmapRecord*>(record.get()); |
| if ((r.header.misc & PERF_RECORD_MISC_CPUMODE_MASK) == PERF_RECORD_MISC_KERNEL) { |
| thread_tree->AddKernelMap(r.data.addr, r.data.len, r.data.pgoff, r.sample_id.time_data.time, |
| r.filename); |
| } else { |
| thread_tree->AddThreadMap(r.data.pid, r.data.tid, r.data.addr, r.data.len, r.data.pgoff, |
| r.sample_id.time_data.time, r.filename); |
| } |
| } else if (record->header.type == PERF_RECORD_MMAP2) { |
| const Mmap2Record& r = *static_cast<const Mmap2Record*>(record.get()); |
| if ((r.header.misc & PERF_RECORD_MISC_CPUMODE_MASK) == PERF_RECORD_MISC_KERNEL) { |
| thread_tree->AddKernelMap(r.data.addr, r.data.len, r.data.pgoff, r.sample_id.time_data.time, |
| r.filename); |
| } else { |
| std::string filename = |
| (r.filename == DEFAULT_EXECNAME_FOR_THREAD_MMAP) ? "[unknown]" : r.filename; |
| thread_tree->AddThreadMap(r.data.pid, r.data.tid, r.data.addr, r.data.len, r.data.pgoff, |
| r.sample_id.time_data.time, filename); |
| } |
| } else if (record->header.type == PERF_RECORD_COMM) { |
| const CommRecord& r = *static_cast<const CommRecord*>(record.get()); |
| thread_tree->AddThread(r.data.pid, r.data.tid, r.comm); |
| } else if (record->header.type == PERF_RECORD_FORK) { |
| const ForkRecord& r = *static_cast<const ForkRecord*>(record.get()); |
| thread_tree->ForkThread(r.data.pid, r.data.tid, r.data.ppid, r.data.ptid); |
| } |
| } |
| } |