2 * Copyright 2016 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
20 #include <folly/File.h>
21 #include <folly/Format.h>
22 #include <folly/MemoryMapping.h>
23 #include <folly/Range.h>
24 #include <folly/ScopeGuard.h>
25 #include <folly/experimental/io/HugePages.h>
26 #include <folly/portability/GFlags.h>
28 DEFINE_bool(cp, false, "Copy file");
30 using namespace folly;
34 [[noreturn]] void usage(const char* name) {
35 std::cerr << folly::format(
37 " list all huge page sizes and their mount points\n"
38 " {0} -cp <src_file> <dest_nameprefix>\n"
39 " copy src_file to a huge page file\n",
44 void copy(const char* srcFile, const char* dest) {
45 fs::path destPath(dest);
46 if (!destPath.is_absolute()) {
47 auto hp = getHugePageSize();
48 CHECK(hp) << "no huge pages available";
49 destPath = fs::canonical_parent(destPath, hp->mountPoint);
52 mmapFileCopy(srcFile, destPath.c_str());
56 for (const auto& p : getHugePageSizes()) {
57 std::cout << p.size << " " << p.mountPoint << "\n";
64 int main(int argc, char *argv[]) {
65 gflags::ParseCommandLineFlags(&argc, &argv, true);
67 if (argc != 3) usage(argv[0]);
68 copy(argv[1], argv[2]);
70 if (argc != 1) usage(argv[0]);