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82 lines
2.3 KiB
82 lines
2.3 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <sys/types.h>
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#include <unistd.h>
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#include <string>
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#include <vector>
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#include <android-base/unique_fd.h>
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namespace android {
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namespace meminfo {
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class PageAcct final {
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// Class for per-page accounting by using kernel provided interfaces like
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// kpagecount, kpageflags etc.
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public:
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static bool KernelHasPageIdle() {
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return (access("/sys/kernel/mm/page_idle/bitmap", R_OK | W_OK) == 0);
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}
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bool InitPageAcct(bool pageidle_enable = false);
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bool PageFlags(uint64_t pfn, uint64_t* flags);
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bool PageMapCount(uint64_t pfn, uint64_t* mapcount);
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int IsPageIdle(uint64_t pfn);
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// The only way to create PageAcct object
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static PageAcct& Instance() {
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static PageAcct instance;
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return instance;
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}
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~PageAcct() = default;
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private:
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PageAcct() : kpagecount_fd_(-1), kpageflags_fd_(-1), pageidle_fd_(-1) {}
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int MarkPageIdle(uint64_t pfn) const;
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int GetPageIdle(uint64_t pfn) const;
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// Non-copyable & Non-movable
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PageAcct(const PageAcct&) = delete;
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PageAcct& operator=(const PageAcct&) = delete;
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PageAcct& operator=(PageAcct&&) = delete;
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PageAcct(PageAcct&&) = delete;
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::android::base::unique_fd kpagecount_fd_;
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::android::base::unique_fd kpageflags_fd_;
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::android::base::unique_fd pageidle_fd_;
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};
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// Returns if the page present bit is set in the value
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// passed in.
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bool page_present(uint64_t pagemap_val);
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// Returns if the page swapped bit is set in the value
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// passed in.
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bool page_swapped(uint64_t pagemap_val);
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// Returns the page frame number (physical page) from
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// pagemap value
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uint64_t page_pfn(uint64_t pagemap_val);
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} // namespace meminfo
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} // namespace android
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