ecfbddf0cd
For anonymous objects, provide a handle kvo_me naming the object, and report the handle of the backing object. This allows userspace to deconstruct the shadow chain. Right now the handle is the address of the object in KVA, but this is not guaranteed. For the same anonymous objects, report the swap space used for actually swapped out pages, in kvo_swapped field. I do not believe that it is useful to report full 64bit counter there, so only uint32_t value is returned, clamped to the max. For kinfo_vmentry, report anonymous object handle backing the entry, so that the shadow chain for the specific mapping can be deconstructed. Reviewed by: markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D29771
89 lines
3.0 KiB
C
89 lines
3.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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. 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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* $FreeBSD$
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*/
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#ifndef _VM_SWAP_PAGER_H_
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#define _VM_SWAP_PAGER_H_
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#include <sys/_types.h>
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struct buf;
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struct swdevt;
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typedef void sw_strategy_t(struct buf *, struct swdevt *);
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typedef void sw_close_t(struct thread *, struct swdevt *);
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/*
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* Swap device table
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*/
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struct swdevt {
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int sw_flags;
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int sw_nblks;
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int sw_used;
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dev_t sw_dev;
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struct vnode *sw_vp;
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void *sw_id;
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__daddr_t sw_first;
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__daddr_t sw_end;
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struct blist *sw_blist;
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TAILQ_ENTRY(swdevt) sw_list;
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sw_strategy_t *sw_strategy;
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sw_close_t *sw_close;
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};
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#define SW_UNMAPPED 0x01
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#define SW_CLOSING 0x04
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#ifdef _KERNEL
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extern int swap_pager_avail;
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struct xswdev;
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int swap_dev_info(int name, struct xswdev *xs, char *devname, size_t len);
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void swap_pager_copy(vm_object_t, vm_object_t, vm_pindex_t, int);
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vm_pindex_t swap_pager_find_least(vm_object_t object, vm_pindex_t pindex);
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void swap_pager_freespace(vm_object_t, vm_pindex_t, vm_size_t);
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void swap_pager_swap_init(void);
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int swap_pager_nswapdev(void);
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int swap_pager_reserve(vm_object_t, vm_pindex_t, vm_size_t);
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void swap_pager_status(int *total, int *used);
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u_long swap_pager_swapped_pages(vm_object_t object);
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void swapoff_all(void);
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#endif /* _KERNEL */
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#endif /* _VM_SWAP_PAGER_H_ */
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