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rocksdb/util/thread_status_updater.cc

257 lines
7.9 KiB

// Copyright (c) 2014, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#include <memory>
#include "port/likely.h"
#include "util/mutexlock.h"
#include "util/thread_status_updater.h"
namespace rocksdb {
#if ROCKSDB_USING_THREAD_STATUS
__thread ThreadStatusData* ThreadStatusUpdater::thread_status_data_ = nullptr;
void ThreadStatusUpdater::UnregisterThread() {
if (thread_status_data_ != nullptr) {
std::lock_guard<std::mutex> lck(thread_list_mutex_);
thread_data_set_.erase(thread_status_data_);
delete thread_status_data_;
thread_status_data_ = nullptr;
}
}
void ThreadStatusUpdater::SetThreadType(
ThreadStatus::ThreadType ttype) {
auto* data = InitAndGet();
data->thread_type.store(ttype, std::memory_order_relaxed);
}
void ThreadStatusUpdater::ResetThreadStatus() {
ClearThreadState();
ClearThreadOperation();
SetColumnFamilyInfoKey(nullptr);
}
void ThreadStatusUpdater::SetColumnFamilyInfoKey(
const void* cf_key) {
auto* data = InitAndGet();
// set the tracking flag based on whether cf_key is non-null or not.
// If enable_thread_tracking is set to false, the input cf_key
// would be nullptr.
data->enable_tracking = (cf_key != nullptr);
data->cf_key.store(cf_key, std::memory_order_relaxed);
}
const void* ThreadStatusUpdater::GetColumnFamilyInfoKey() {
auto* data = InitAndGet();
if (data->enable_tracking == false) {
return nullptr;
}
return data->cf_key.load(std::memory_order_relaxed);
}
void ThreadStatusUpdater::SetThreadOperation(
const ThreadStatus::OperationType type) {
auto* data = InitAndGet();
if (!data->enable_tracking) {
assert(data->cf_key.load(std::memory_order_relaxed) == nullptr);
return;
}
data->operation_type.store(type, std::memory_order_relaxed);
}
void ThreadStatusUpdater::ClearThreadOperation() {
auto* data = InitAndGet();
if (!data->enable_tracking) {
assert(data->cf_key.load(std::memory_order_relaxed) == nullptr);
return;
}
data->operation_type.store(
ThreadStatus::OP_UNKNOWN, std::memory_order_relaxed);
}
void ThreadStatusUpdater::SetThreadState(
const ThreadStatus::StateType type) {
auto* data = InitAndGet();
if (!data->enable_tracking) {
assert(data->cf_key.load(std::memory_order_relaxed) == nullptr);
return;
}
data->state_type.store(type, std::memory_order_relaxed);
}
void ThreadStatusUpdater::ClearThreadState() {
auto* data = InitAndGet();
if (!data->enable_tracking) {
assert(data->cf_key.load(std::memory_order_relaxed) == nullptr);
return;
}
data->state_type.store(
ThreadStatus::STATE_UNKNOWN, std::memory_order_relaxed);
}
Status ThreadStatusUpdater::GetThreadList(
std::vector<ThreadStatus>* thread_list) {
thread_list->clear();
std::vector<std::shared_ptr<ThreadStatusData>> valid_list;
std::lock_guard<std::mutex> lck(thread_list_mutex_);
for (auto* thread_data : thread_data_set_) {
assert(thread_data);
auto thread_type = thread_data->thread_type.load(
std::memory_order_relaxed);
// Since any change to cf_info_map requires thread_list_mutex,
// which is currently held by GetThreadList(), here we can safely
// use "memory_order_relaxed" to load the cf_key.
auto cf_key = thread_data->cf_key.load(
std::memory_order_relaxed);
auto iter = cf_info_map_.find(cf_key);
assert(cf_key == 0 || iter != cf_info_map_.end());
auto* cf_info = iter != cf_info_map_.end() ?
iter->second.get() : nullptr;
const std::string* db_name = nullptr;
const std::string* cf_name = nullptr;
ThreadStatus::OperationType op_type = ThreadStatus::OP_UNKNOWN;
ThreadStatus::StateType state_type = ThreadStatus::STATE_UNKNOWN;
if (cf_info != nullptr) {
db_name = &cf_info->db_name;
cf_name = &cf_info->cf_name;
op_type = thread_data->operation_type.load(
std::memory_order_relaxed);
// display lower-level info only when higher-level info is available.
if (op_type != ThreadStatus::OP_UNKNOWN) {
state_type = thread_data->state_type.load(
std::memory_order_relaxed);
}
}
thread_list->emplace_back(
thread_data->thread_id, thread_type,
db_name ? *db_name : "",
cf_name ? *cf_name : "",
op_type, state_type);
}
return Status::OK();
}
ThreadStatusData* ThreadStatusUpdater::InitAndGet() {
if (UNLIKELY(thread_status_data_ == nullptr)) {
thread_status_data_ = new ThreadStatusData();
thread_status_data_->thread_id = reinterpret_cast<uint64_t>(
thread_status_data_);
std::lock_guard<std::mutex> lck(thread_list_mutex_);
thread_data_set_.insert(thread_status_data_);
}
return thread_status_data_;
}
void ThreadStatusUpdater::NewColumnFamilyInfo(
const void* db_key, const std::string& db_name,
const void* cf_key, const std::string& cf_name) {
// Acquiring same lock as GetThreadList() to guarantee
// a consistent view of global column family table (cf_info_map).
std::lock_guard<std::mutex> lck(thread_list_mutex_);
cf_info_map_[cf_key].reset(
new ConstantColumnFamilyInfo(db_key, db_name, cf_name));
db_key_map_[db_key].insert(cf_key);
}
void ThreadStatusUpdater::EraseColumnFamilyInfo(const void* cf_key) {
// Acquiring same lock as GetThreadList() to guarantee
// a consistent view of global column family table (cf_info_map).
std::lock_guard<std::mutex> lck(thread_list_mutex_);
auto cf_pair = cf_info_map_.find(cf_key);
assert(cf_pair != cf_info_map_.end());
auto* cf_info = cf_pair->second.get();
assert(cf_info);
// Remove its entry from db_key_map_ by the following steps:
// 1. Obtain the entry in db_key_map_ whose set contains cf_key
// 2. Remove it from the set.
auto db_pair = db_key_map_.find(cf_info->db_key);
assert(db_pair != db_key_map_.end());
size_t result __attribute__((unused)) = db_pair->second.erase(cf_key);
assert(result);
cf_pair->second.reset();
result = cf_info_map_.erase(cf_key);
assert(result);
}
void ThreadStatusUpdater::EraseDatabaseInfo(const void* db_key) {
// Acquiring same lock as GetThreadList() to guarantee
// a consistent view of global column family table (cf_info_map).
std::lock_guard<std::mutex> lck(thread_list_mutex_);
auto db_pair = db_key_map_.find(db_key);
if (UNLIKELY(db_pair == db_key_map_.end())) {
// In some occasional cases such as DB::Open fails, we won't
// register ColumnFamilyInfo for a db.
return;
}
size_t result __attribute__((unused)) = 0;
for (auto cf_key : db_pair->second) {
auto cf_pair = cf_info_map_.find(cf_key);
assert(cf_pair != cf_info_map_.end());
cf_pair->second.reset();
result = cf_info_map_.erase(cf_key);
assert(result);
}
db_key_map_.erase(db_key);
}
#else
void ThreadStatusUpdater::UnregisterThread() {
}
void ThreadStatusUpdater::ResetThreadStatus() {
}
void ThreadStatusUpdater::SetThreadType(
ThreadStatus::ThreadType ttype) {
}
void ThreadStatusUpdater::SetColumnFamilyInfoKey(
const void* cf_key) {
}
void ThreadStatusUpdater::SetThreadOperation(
const ThreadStatus::OperationType type) {
}
void ThreadStatusUpdater::ClearThreadOperation() {
}
void ThreadStatusUpdater::SetThreadState(
const ThreadStatus::StateType type) {
}
void ThreadStatusUpdater::ClearThreadState() {
}
Status ThreadStatusUpdater::GetThreadList(
std::vector<ThreadStatus>* thread_list) {
return Status::NotSupported(
"GetThreadList is not supported in the current running environment.");
}
void ThreadStatusUpdater::NewColumnFamilyInfo(
const void* db_key, const std::string& db_name,
const void* cf_key, const std::string& cf_name) {
}
void ThreadStatusUpdater::EraseColumnFamilyInfo(const void* cf_key) {
}
void ThreadStatusUpdater::EraseDatabaseInfo(const void* db_key) {
}
#endif // ROCKSDB_USING_THREAD_STATUS
} // namespace rocksdb