1 // Copyright (C) 2021 The Android Open Source Project
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include <ditto/invalidate_cache.h>
16
17 #include <ditto/logger.h>
18
19 namespace dittosuite {
20
InvalidateCache(SyscallInterface & syscall,int repeat)21 InvalidateCache::InvalidateCache(SyscallInterface& syscall, int repeat)
22 : Instruction(syscall, kName, repeat) {}
23
RunSingle()24 void InvalidateCache::RunSingle() {
25 syscall_.Sync();
26 std::string cache_file = "/proc/sys/vm/drop_caches";
27
28 int fd = syscall_.Open(cache_file, O_WRONLY, 0);
29 if (fd == -1) {
30 PLOGF("Cannot open \"" + cache_file + "\", which requires root privileges");
31 }
32
33 char data = '3';
34 if (syscall_.Write(fd, &data, sizeof(char), 0) == -1) {
35 PLOGF("Error while calling write() in InvalidateCache. Make sure to run the benchmark as root");
36 }
37
38 if (syscall_.Close(fd) == -1) {
39 PLOGF("Error while calling close() in InvalidateCache. Make sure to run the benchmark as root");
40 }
41 }
42
43 } // namespace dittosuite
44