1 /* 2 * Copyright (C) 2019 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 #ifndef SRC_PROFILING_MEMORY_PAGE_IDLE_CHECKER_H_ 18 #define SRC_PROFILING_MEMORY_PAGE_IDLE_CHECKER_H_ 19 20 #include <set> 21 22 #include <stddef.h> 23 #include <stdint.h> 24 25 #include "perfetto/ext/base/scoped_file.h" 26 27 namespace perfetto { 28 namespace profiling { 29 30 uint64_t GetFirstPageShare(uint64_t addr, size_t size); 31 uint64_t GetLastPageShare(uint64_t addr, size_t size); 32 33 class PageIdleChecker { 34 public: PageIdleChecker(base::ScopedFile page_idle_fd)35 PageIdleChecker(base::ScopedFile page_idle_fd) 36 : page_idle_fd_(std::move(page_idle_fd)) {} 37 38 // Return number of bytes of allocation of size bytes starting at alloc that 39 // are on unreferenced pages. 40 // Return -1 on error. 41 int64_t OnIdlePage(uint64_t addr, size_t size); 42 43 void MarkPagesIdle(); 44 45 private: 46 void MarkPageIdle(uint64_t virt_page_nr); 47 // Return 1 if page is idle, 0 if it is not idle, or -1 on error. 48 int IsPageIdle(uint64_t virt_page_nr); 49 50 std::set<uint64_t> touched_virt_page_nrs_; 51 52 base::ScopedFile page_idle_fd_; 53 }; 54 55 } // namespace profiling 56 } // namespace perfetto 57 58 #endif // SRC_PROFILING_MEMORY_PAGE_IDLE_CHECKER_H_ 59