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flag. The obvious advantage is that one can still see what state a page is in and even move it between states while being marked busy. * Removed the vm_page::is_dummy flag. Instead we mark marker pages busy, which in all cases has the same effect. Introduced a vm_page_is_dummy() that can still check whether a given page is a dummy page. * vm_page_unreserve_pages(): Before adding to the system reserve make sure sUnreservedFreePages is non-negative. Otherwise we'd make nonexisting pages available for allocation. steal_pages() still has the same problem and it can't be solved that easily. * map_page(): No longer changes the page state/mark the page unbusy. That's the caller's responsibility. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35331 a95241bf-73f2-0310-859d-f6bbb57e9c96
66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/*
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* Copyright 2002-2009, Axel Dörfler, axeld@pinc-software.de.
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* Distributed under the terms of the MIT License.
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*
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* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
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* Distributed under the terms of the NewOS License.
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*/
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#ifndef _KERNEL_VM_VM_PAGE_H
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#define _KERNEL_VM_VM_PAGE_H
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#include <vm/vm.h>
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struct kernel_args;
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extern int32 gMappedPagesCount;
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#ifdef __cplusplus
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extern "C" {
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#endif
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void vm_page_init_num_pages(struct kernel_args *args);
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status_t vm_page_init(struct kernel_args *args);
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status_t vm_page_init_post_area(struct kernel_args *args);
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status_t vm_page_init_post_thread(struct kernel_args *args);
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status_t vm_mark_page_inuse(addr_t page);
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status_t vm_mark_page_range_inuse(addr_t startPage, addr_t length);
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void vm_page_free(struct VMCache *cache, struct vm_page *page);
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void vm_page_set_state(struct vm_page *page, int state);
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void vm_page_requeue(struct vm_page *page, bool tail);
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// get some data about the number of pages in the system
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size_t vm_page_num_pages(void);
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size_t vm_page_num_free_pages(void);
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size_t vm_page_num_available_pages(void);
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size_t vm_page_num_unused_pages(void);
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void vm_page_get_stats(system_info *info);
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status_t vm_page_write_modified_page_range(struct VMCache *cache,
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uint32 firstPage, uint32 endPage);
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status_t vm_page_write_modified_pages(struct VMCache *cache);
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void vm_page_schedule_write_page(struct vm_page *page);
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void vm_page_schedule_write_page_range(struct VMCache *cache,
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uint32 firstPage, uint32 endPage);
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void vm_page_unreserve_pages(uint32 count);
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void vm_page_reserve_pages(uint32 count, int priority);
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bool vm_page_try_reserve_pages(uint32 count, int priority);
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struct vm_page *vm_page_allocate_page(int pageState);
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struct vm_page *vm_page_allocate_page_run(int state, addr_t base,
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addr_t length, int priority);
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struct vm_page *vm_page_allocate_page_run_no_base(int state, addr_t count,
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int priority);
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struct vm_page *vm_page_at_index(int32 index);
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struct vm_page *vm_lookup_page(addr_t pageNumber);
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bool vm_page_is_dummy(struct vm_page *page);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _KERNEL_VM_VM_PAGE_H */
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