1 /*
2  * Copyright (c) 2023 Huawei Device Co., Ltd.
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 #ifndef OHOS_MEMORY_MEMMGR_KSWAPD_OBSERVER_H
16 #define OHOS_MEMORY_MEMMGR_KSWAPD_OBSERVER_H
17 
18 #include "event_handler.h"
19 
20 struct epoll_event;
21 
22 namespace OHOS {
23 namespace Memory {
24 
25 void HandleKswapdReport();
26 
27 #define KSWAPD_PRESSURE_FILE "/proc/kswapd_monitor"
28 
29 class KswapdObserver {
30 public:
31     KswapdObserver();
32     ~KswapdObserver();
33     void Init();
34 
35 private:
36     // run MainLoop on handler thread
37     std::shared_ptr<AppExecFwk::EventHandler> handler_;
38     int epollfd_ = -1;
39     int kswapdMonitorFd_ = -1;
40     bool RegisterKswapdListener();
41     void MainLoop(void);
42     void HandleEventEpollHup(struct epoll_event *curEpollEvent);
43 };
44 } // namespace Memory
45 } // namespace OHOS
46 #endif // OHOS_MEMORY_MEMMGR_KSWAPD_OBSERVER_H