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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SRC_PROFILING_MEMORY_PAGE_IDLE_CHECKER_H_
#define SRC_PROFILING_MEMORY_PAGE_IDLE_CHECKER_H_
#include <set>
#include <stddef.h>
#include <stdint.h>
#include "perfetto/ext/base/scoped_file.h"
namespace perfetto {
namespace profiling {
uint64_t GetFirstPageShare(uint64_t addr, size_t size);
uint64_t GetLastPageShare(uint64_t addr, size_t size);
class PageIdleChecker {
public:
PageIdleChecker(base::ScopedFile page_idle_fd)
: page_idle_fd_(std::move(page_idle_fd)) {}
// Return number of bytes of allocation of size bytes starting at alloc that
// are on unreferenced pages.
// Return -1 on error.
int64_t OnIdlePage(uint64_t addr, size_t size);
void MarkPagesIdle();
private:
void MarkPageIdle(uint64_t virt_page_nr);
// Return 1 if page is idle, 0 if it is not idle, or -1 on error.
int IsPageIdle(uint64_t virt_page_nr);
std::set<uint64_t> touched_virt_page_nrs_;
base::ScopedFile page_idle_fd_;
};
} // namespace profiling
} // namespace perfetto
#endif // SRC_PROFILING_MEMORY_PAGE_IDLE_CHECKER_H_
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