folly/folly/io/HugePages.cpp

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * 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 <folly/io/HugePages.h>

#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>

#include <cctype>
#include <cstring>

#include <algorithm>
#include <stdexcept>
#include <system_error>

#include <boost/regex.hpp>

#include <folly/Conv.h>
#include <folly/CppAttributes.h>
#include <folly/Format.h>
#include <folly/Range.h>
#include <folly/String.h>

#include <folly/gen/Base.h>
#include <folly/gen/File.h>
#include <folly/gen/String.h>

namespace folly {

namespace {

// Get the default huge page size
size_t getDefaultHugePageSize() { … }

// Get raw huge page sizes (without mount points, they'll be filled later)
HugePageSizeVec readRawHugePageSizes() { … }

// Parse the value of a pagesize mount option
// Format: number, optional K/M/G/T suffix, trailing junk allowed
size_t parsePageSizeValue(StringPiece value) { … }

/**
 * Get list of supported huge page sizes and their mount points, if
 * hugetlbfs file systems are mounted for those sizes.
 */
HugePageSizeVec readHugePageSizes() { … }

} // namespace

const HugePageSizeVec& getHugePageSizes() { … }

const HugePageSize* getHugePageSize(size_t size) { … }

const HugePageSize* getHugePageSizeForDevice(dev_t device) { … }

} // namespace folly