1 /*
2 * Copyright (C) 2023 The Android Open Source Project
3 *
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
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
17 #include <fcntl.h>
18 #include <sys/mman.h>
19 #include <sys/syscall.h>
20 #include <unistd.h>
21
22 #include <benchmark/benchmark.h>
23
24 #include "android-base/file.h"
25 #include "android-base/logging.h"
26
BM_ReadFdToString(benchmark::State & state)27 static void BM_ReadFdToString(benchmark::State& state) {
28 android::base::unique_fd fd(syscall(__NR_memfd_create, "memfile", 0));
29 CHECK(fd.get() > 0);
30 CHECK_EQ(ftruncate(fd, state.range(0)), 0);
31 for (auto _ : state) {
32 CHECK_EQ(lseek(fd, 0, SEEK_SET), 0);
33 std::string str;
34 benchmark::DoNotOptimize(android::base::ReadFdToString(fd, &str));
35 }
36 state.SetBytesProcessed(state.iterations() * state.range(0));
37 }
38
39 BENCHMARK_RANGE(BM_ReadFdToString, 0, 1024 * 1024);
40