0a47b48b9f
about the contents anymore. This gives us alot of the advantage of freeing individual pages through munmap, but with almost none of the overhead.
81 lines
3.4 KiB
C
81 lines
3.4 KiB
C
/*
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* Copyright (c) 1990 University of Utah.
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)swap_pager.h 7.1 (Berkeley) 12/5/90
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* $Id: swap_pager.h,v 1.15 1996/03/03 21:11:06 dyson Exp $
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*/
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/*
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* Modifications to the block allocation data structure by John S. Dyson
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* 18 Dec 93.
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*/
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#ifndef _SWAP_PAGER_
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#define _SWAP_PAGER_ 1
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/*
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* SWB_NPAGES can be set to any value from 1 to 16 pages per allocation,
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* however, due to the allocation spilling into non-swap pager backed memory,
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* suggest keeping SWB_NPAGES small (1-4). If high performance is mandatory
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* perhaps up to 8 pages might be in order????
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* Above problem has been fixed, now we support 16 pages per block. Unused
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* space is recovered by the swap pager now...
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*/
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#define SWB_NPAGES 8
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struct swblock {
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unsigned short swb_valid; /* bitmask for valid pages */
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unsigned short swb_locked; /* block locked */
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daddr_t swb_block[SWB_NPAGES]; /* unfortunately int instead of daddr_t */
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};
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typedef struct swblock *sw_blk_t;
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#ifdef KERNEL
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extern struct pagerlst swap_pager_un_object_list;
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extern int swap_pager_full;
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extern struct rlisthdr swaplist;
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int swap_pager_putpages __P((vm_object_t, vm_page_t *, int, boolean_t, int *));
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int swap_pager_swp_alloc __P((vm_object_t, int));
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void swap_pager_copy __P((vm_object_t, vm_pindex_t, vm_object_t,
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vm_pindex_t, vm_pindex_t));
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void swap_pager_freespace __P((vm_object_t, vm_pindex_t, vm_size_t));
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void swap_pager_dmzspace __P((vm_object_t, vm_pindex_t, vm_size_t));
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void swap_pager_swap_init __P((void));
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#endif
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#endif /* _SWAP_PAGER_ */
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