mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
21cd6e6232
struct swblock entries by dividing the number of the entries by 2 until the swap metadata fits. - Reject swapon(2) upon failure of swap_zone allocation. This is just a temporary fix. Better solutions include: (suggested by: dillon) o reserving swap in SWAP_META_PAGES chunks, and o swapping the swblock structures themselves. Reviewed by: alfred, dillon
112 lines
4.1 KiB
C
112 lines
4.1 KiB
C
/*
|
|
* Copyright (c) 1990 University of Utah.
|
|
* Copyright (c) 1991 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Systems Programming Group of the University of Utah Computer
|
|
* Science Department.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from: @(#)swap_pager.h 7.1 (Berkeley) 12/5/90
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Modifications to the block allocation data structure by John S. Dyson
|
|
* 18 Dec 93.
|
|
*/
|
|
|
|
#ifndef _SWAP_PAGER_
|
|
#define _SWAP_PAGER_ 1
|
|
|
|
/*
|
|
* SWB_NPAGES must be a power of 2. It may be set to 1, 2, 4, 8, or 16
|
|
* pages per allocation. We recommend you stick with the default of 8.
|
|
* The 16-page limit is due to the radix code (kern/subr_blist.c).
|
|
*/
|
|
#if !defined(SWB_NPAGES)
|
|
#define SWB_NPAGES 8
|
|
#endif
|
|
|
|
/*
|
|
* Piecemeal swap metadata structure. Swap is stored in a radix tree.
|
|
*
|
|
* If SWB_NPAGES is 8 and sizeof(char *) == sizeof(daddr_t), our radix
|
|
* is basically 8. Assuming PAGE_SIZE == 4096, one tree level represents
|
|
* 32K worth of data, two levels represent 256K, three levels represent
|
|
* 2 MBytes. This is acceptable.
|
|
*
|
|
* Overall memory utilization is about the same as the old swap structure.
|
|
*/
|
|
|
|
#define SWCORRECT(n) (sizeof(void *) * (n) / sizeof(daddr_t))
|
|
|
|
#define SWAP_META_PAGES (SWB_NPAGES * 2)
|
|
#define SWAP_META_MASK (SWAP_META_PAGES - 1)
|
|
|
|
struct swblock {
|
|
struct swblock *swb_hnext;
|
|
vm_object_t swb_object;
|
|
vm_pindex_t swb_index;
|
|
int swb_count;
|
|
daddr_t swb_pages[SWAP_META_PAGES];
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
extern struct pagerlst swap_pager_un_object_list;
|
|
extern int swap_pager_full;
|
|
extern struct blist *swapblist;
|
|
extern vm_zone_t swap_zone;
|
|
|
|
void swap_pager_putpages __P((vm_object_t, vm_page_t *, int, boolean_t, int *));
|
|
boolean_t swap_pager_haspage __P((vm_object_t object, vm_pindex_t pindex, int *before, int *after));
|
|
|
|
int swap_pager_swp_alloc __P((vm_object_t, int));
|
|
void swap_pager_copy __P((vm_object_t, vm_object_t, vm_pindex_t, int));
|
|
void swap_pager_freespace __P((vm_object_t, vm_pindex_t, vm_size_t));
|
|
void swap_pager_dmzspace __P((vm_object_t, vm_pindex_t, vm_size_t));
|
|
void swap_pager_swap_init __P((void));
|
|
int swap_pager_reserve __P((vm_object_t, vm_pindex_t, vm_size_t));
|
|
|
|
/*
|
|
* newswap functions
|
|
*/
|
|
|
|
void swap_pager_page_removed __P((vm_page_t, vm_object_t));
|
|
|
|
/* choose underlying swap device and queue up I/O */
|
|
struct buf;
|
|
void swstrategy __P((struct buf *bp)); /* probably needs to move elsewhere */
|
|
|
|
#endif
|
|
|
|
#endif /* _SWAP_PAGER_ */
|