blob: 1a7264c701b70822a3f3b0b3697dde21b619d5bc [file] [log] [blame] [edit]
#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