| #include "cpu_set.h" |
| |
| #include <log/log.h> |
| |
| #include <algorithm> |
| #include <iomanip> |
| #include <iostream> |
| #include <sstream> |
| #include <string> |
| |
| #include <android-base/file.h> |
| |
| #include "directory_reader.h" |
| #include "stdio_filebuf.h" |
| #include "task.h" |
| #include "unique_file.h" |
| |
| using android::pdx::ErrorStatus; |
| using android::pdx::Status; |
| |
| namespace { |
| |
| constexpr int kDirectoryFlags = O_RDONLY | O_DIRECTORY | O_CLOEXEC; |
| constexpr pid_t kKernelThreadDaemonPid = 2; |
| |
| } // anonymous namespace |
| |
| namespace android { |
| namespace dvr { |
| |
| bool CpuSet::prefix_enabled_ = false; |
| |
| void CpuSetManager::Load(const std::string& cpuset_root) { |
| if (!root_set_) |
| root_set_ = Create(cpuset_root); |
| } |
| |
| std::unique_ptr<CpuSet> CpuSetManager::Create(const std::string& path) { |
| base::unique_fd root_cpuset_fd(open(path.c_str(), kDirectoryFlags)); |
| if (root_cpuset_fd.get() < 0) { |
| ALOGE("CpuSet::Create: Failed to open \"%s\": %s", path.c_str(), |
| strerror(errno)); |
| return nullptr; |
| } |
| |
| return Create(std::move(root_cpuset_fd), "/", nullptr); |
| } |
| |
| std::unique_ptr<CpuSet> CpuSetManager::Create(base::unique_fd base_fd, |
| const std::string& name, |
| CpuSet* parent) { |
| DirectoryReader directory(base::unique_fd(dup(base_fd))); |
| if (!directory) { |
| ALOGE("CpuSet::Create: Failed to opendir %s cpuset: %s", name.c_str(), |
| strerror(directory.GetError())); |
| return nullptr; |
| } |
| |
| std::unique_ptr<CpuSet> group( |
| new CpuSet(parent, name, base::unique_fd(dup(base_fd)))); |
| path_map_.insert(std::make_pair(group->path(), group.get())); |
| |
| while (dirent* entry = directory.Next()) { |
| if (entry->d_type == DT_DIR) { |
| std::string directory_name(entry->d_name); |
| |
| if (directory_name == "." || directory_name == "..") |
| continue; |
| |
| base::unique_fd entry_fd( |
| openat(base_fd.get(), directory_name.c_str(), kDirectoryFlags)); |
| if (entry_fd.get() >= 0) { |
| auto child = |
| Create(std::move(entry_fd), directory_name.c_str(), group.get()); |
| |
| if (child) |
| group->AddChild(std::move(child)); |
| else |
| return nullptr; |
| } else { |
| ALOGE("CpuSet::Create: Failed to openat \"%s\": %s", entry->d_name, |
| strerror(errno)); |
| return nullptr; |
| } |
| } |
| } |
| |
| return group; |
| } |
| |
| CpuSet* CpuSetManager::Lookup(const std::string& path) { |
| auto search = path_map_.find(path); |
| if (search != path_map_.end()) |
| return search->second; |
| else |
| return nullptr; |
| } |
| |
| std::vector<CpuSet*> CpuSetManager::GetCpuSets() { |
| std::vector<CpuSet*> sets(path_map_.size()); |
| |
| for (const auto& pair : path_map_) { |
| sets.push_back(pair.second); |
| } |
| |
| return sets; |
| } |
| |
| std::string CpuSetManager::DumpState() const { |
| size_t max_path = 0; |
| std::vector<CpuSet*> sets; |
| |
| for (const auto& pair : path_map_) { |
| max_path = std::max(max_path, pair.second->path().length()); |
| sets.push_back(pair.second); |
| } |
| |
| std::sort(sets.begin(), sets.end(), [](const CpuSet* a, const CpuSet* b) { |
| return a->path() < b->path(); |
| }); |
| |
| std::ostringstream stream; |
| |
| stream << std::left; |
| stream << std::setw(max_path) << "Path"; |
| stream << " "; |
| stream << std::setw(6) << "CPUs"; |
| stream << " "; |
| stream << std::setw(6) << "Tasks"; |
| stream << std::endl; |
| |
| stream << std::string(max_path, '_'); |
| stream << " "; |
| stream << std::string(6, '_'); |
| stream << " "; |
| stream << std::string(6, '_'); |
| stream << std::endl; |
| |
| for (const auto set : sets) { |
| stream << std::left; |
| stream << std::setw(max_path) << set->path(); |
| stream << " "; |
| stream << std::right; |
| stream << std::setw(6) << set->GetCpuList(); |
| stream << " "; |
| stream << std::setw(6) << set->GetTasks().size(); |
| stream << std::endl; |
| } |
| |
| return stream.str(); |
| } |
| |
| void CpuSetManager::MoveUnboundTasks(const std::string& target_set) { |
| auto root = Lookup("/"); |
| if (!root) { |
| ALOGE("CpuSetManager::MoveUnboundTasks: Failed to find root cpuset!"); |
| return; |
| } |
| |
| auto target = Lookup(target_set); |
| if (!target) { |
| ALOGE( |
| "CpuSetManager::MoveUnboundTasks: Failed to find target cpuset \"%s\"!", |
| target_set.c_str()); |
| return; |
| } |
| |
| auto cpu_list = root->GetCpuList(); |
| |
| for (auto task_id : root->GetTasks()) { |
| Task task(task_id); |
| |
| // Move only unbound kernel threads to the target cpuset. |
| if (task.cpus_allowed_list() == cpu_list && |
| task.parent_process_id() == kKernelThreadDaemonPid) { |
| ALOGD_IF(TRACE, |
| "CpuSetManager::MoveUnboundTasks: Moving task_id=%d name=%s to " |
| "target_set=%s tgid=%d ppid=%d.", |
| task_id, task.name().c_str(), target_set.c_str(), |
| task.thread_group_id(), task.parent_process_id()); |
| |
| auto status = target->AttachTask(task_id); |
| ALOGW_IF(!status && status.error() != EINVAL, |
| "CpuSetManager::MoveUnboundTasks: Failed to attach task_id=%d " |
| "to cpuset=%s: %s", |
| task_id, target_set.c_str(), status.GetErrorMessage().c_str()); |
| } else { |
| ALOGD_IF(TRACE, |
| "CpuSet::MoveUnboundTasks: Skipping task_id=%d name=%s cpus=%s.", |
| task_id, task.name().c_str(), task.cpus_allowed_list().c_str()); |
| } |
| } |
| } |
| |
| CpuSet::CpuSet(CpuSet* parent, const std::string& name, |
| base::unique_fd&& cpuset_fd) |
| : parent_(parent), name_(name), cpuset_fd_(std::move(cpuset_fd)) { |
| if (parent_ == nullptr) |
| path_ = name_; |
| else if (parent_->IsRoot()) |
| path_ = parent_->name() + name_; |
| else |
| path_ = parent_->path() + "/" + name_; |
| |
| ALOGI("CpuSet::CpuSet: path=%s", path().c_str()); |
| } |
| |
| base::unique_fd CpuSet::OpenPropertyFile(const std::string& name) const { |
| return OpenFile(prefix_enabled_ ? "cpuset." + name : name); |
| } |
| |
| UniqueFile CpuSet::OpenPropertyFilePointer(const std::string& name) const { |
| return OpenFilePointer(prefix_enabled_ ? "cpuset." + name : name); |
| } |
| |
| base::unique_fd CpuSet::OpenFile(const std::string& name, int flags) const { |
| const std::string relative_path = "./" + name; |
| return base::unique_fd( |
| openat(cpuset_fd_.get(), relative_path.c_str(), flags)); |
| } |
| |
| UniqueFile CpuSet::OpenFilePointer(const std::string& name, int flags) const { |
| const std::string relative_path = "./" + name; |
| base::unique_fd fd(openat(cpuset_fd_.get(), relative_path.c_str(), flags)); |
| if (fd.get() < 0) { |
| ALOGE("CpuSet::OpenPropertyFilePointer: Failed to open %s/%s: %s", |
| path_.c_str(), name.c_str(), strerror(errno)); |
| return nullptr; |
| } |
| |
| UniqueFile fp(fdopen(fd.release(), "r")); |
| if (!fp) |
| ALOGE("CpuSet::OpenPropertyFilePointer: Failed to fdopen %s/%s: %s", |
| path_.c_str(), name.c_str(), strerror(errno)); |
| |
| return fp; |
| } |
| |
| Status<void> CpuSet::AttachTask(pid_t task_id) const { |
| auto file = OpenFile("tasks", O_RDWR); |
| if (file.get() >= 0) { |
| std::ostringstream stream; |
| stream << task_id; |
| std::string value = stream.str(); |
| |
| const bool ret = base::WriteStringToFd(value, file.get()); |
| if (!ret) |
| return ErrorStatus(errno); |
| else |
| return {}; |
| } else { |
| const int error = errno; |
| ALOGE("CpuSet::AttachTask: Failed to open %s/tasks: %s", path_.c_str(), |
| strerror(error)); |
| return ErrorStatus(error); |
| } |
| } |
| |
| std::vector<pid_t> CpuSet::GetTasks() const { |
| std::vector<pid_t> tasks; |
| |
| if (auto file = OpenFilePointer("tasks")) { |
| stdio_filebuf<char> filebuf(file.get()); |
| std::istream file_stream(&filebuf); |
| |
| for (std::string line; std::getline(file_stream, line);) { |
| pid_t task_id = std::strtol(line.c_str(), nullptr, 10); |
| tasks.push_back(task_id); |
| } |
| } |
| |
| return tasks; |
| } |
| |
| std::string CpuSet::GetCpuList() const { |
| if (auto file = OpenPropertyFilePointer("cpus")) { |
| stdio_filebuf<char> filebuf(file.get()); |
| std::istream file_stream(&filebuf); |
| |
| std::string line; |
| if (std::getline(file_stream, line)) |
| return line; |
| } |
| |
| ALOGE("CpuSet::GetCpuList: Failed to read cpu list!!!"); |
| return ""; |
| } |
| |
| void CpuSet::AddChild(std::unique_ptr<CpuSet> child) { |
| children_.push_back(std::move(child)); |
| } |
| |
| } // namespace dvr |
| } // namespace android |