4e6571599b
Add a drain function for struct sysctl_req, and use it for a variety of handlers, some of which had to do awkward things to get a large enough SBUF_FIXEDLEN buffer. Note that some sysctl handlers were explicitly outputting a trailing NUL byte. This behaviour was preserved, though it should not be necessary. Reviewed by: phk (original patch)
727 lines
21 KiB
C
727 lines
21 KiB
C
/*-
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* Copyright (c) 2002-2006 Rice University
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* Copyright (c) 2007-2008 Alan L. Cox <alc@cs.rice.edu>
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Alan L. Cox,
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* Olivier Crameri, Peter Druschel, Sitaram Iyer, and Juan Navarro.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Superpage reservation management module
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_vm.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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#include <sys/sbuf.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_phys.h>
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#include <vm/vm_reserv.h>
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/*
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* The reservation system supports the speculative allocation of large physical
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* pages ("superpages"). Speculative allocation enables the fully-automatic
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* utilization of superpages by the virtual memory system. In other words, no
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* programmatic directives are required to use superpages.
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*/
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#if VM_NRESERVLEVEL > 0
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/*
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* The number of small pages that are contained in a level 0 reservation
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*/
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#define VM_LEVEL_0_NPAGES (1 << VM_LEVEL_0_ORDER)
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/*
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* The number of bits by which a physical address is shifted to obtain the
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* reservation number
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*/
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#define VM_LEVEL_0_SHIFT (VM_LEVEL_0_ORDER + PAGE_SHIFT)
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/*
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* The size of a level 0 reservation in bytes
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*/
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#define VM_LEVEL_0_SIZE (1 << VM_LEVEL_0_SHIFT)
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/*
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* Computes the index of the small page underlying the given (object, pindex)
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* within the reservation's array of small pages.
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*/
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#define VM_RESERV_INDEX(object, pindex) \
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(((object)->pg_color + (pindex)) & (VM_LEVEL_0_NPAGES - 1))
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/*
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* The reservation structure
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*
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* A reservation structure is constructed whenever a large physical page is
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* speculatively allocated to an object. The reservation provides the small
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* physical pages for the range [pindex, pindex + VM_LEVEL_0_NPAGES) of offsets
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* within that object. The reservation's "popcnt" tracks the number of these
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* small physical pages that are in use at any given time. When and if the
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* reservation is not fully utilized, it appears in the queue of partially-
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* populated reservations. The reservation always appears on the containing
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* object's list of reservations.
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*
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* A partially-populated reservation can be broken and reclaimed at any time.
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*/
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struct vm_reserv {
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TAILQ_ENTRY(vm_reserv) partpopq;
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LIST_ENTRY(vm_reserv) objq;
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vm_object_t object; /* containing object */
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vm_pindex_t pindex; /* offset within object */
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vm_page_t pages; /* first page of a superpage */
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int popcnt; /* # of pages in use */
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char inpartpopq;
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};
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/*
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* The reservation array
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*
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* This array is analoguous in function to vm_page_array. It differs in the
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* respect that it may contain a greater number of useful reservation
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* structures than there are (physical) superpages. These "invalid"
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* reservation structures exist to trade-off space for time in the
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* implementation of vm_reserv_from_page(). Invalid reservation structures are
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* distinguishable from "valid" reservation structures by inspecting the
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* reservation's "pages" field. Invalid reservation structures have a NULL
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* "pages" field.
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*
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* vm_reserv_from_page() maps a small (physical) page to an element of this
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* array by computing a physical reservation number from the page's physical
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* address. The physical reservation number is used as the array index.
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*
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* An "active" reservation is a valid reservation structure that has a non-NULL
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* "object" field and a non-zero "popcnt" field. In other words, every active
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* reservation belongs to a particular object. Moreover, every active
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* reservation has an entry in the containing object's list of reservations.
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*/
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static vm_reserv_t vm_reserv_array;
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/*
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* The partially-populated reservation queue
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*
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* This queue enables the fast recovery of an unused cached or free small page
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* from a partially-populated reservation. The reservation at the head of
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* this queue is the least-recently-changed, partially-populated reservation.
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*
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* Access to this queue is synchronized by the free page queue lock.
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*/
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static TAILQ_HEAD(, vm_reserv) vm_rvq_partpop =
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TAILQ_HEAD_INITIALIZER(vm_rvq_partpop);
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static SYSCTL_NODE(_vm, OID_AUTO, reserv, CTLFLAG_RD, 0, "Reservation Info");
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static long vm_reserv_broken;
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SYSCTL_LONG(_vm_reserv, OID_AUTO, broken, CTLFLAG_RD,
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&vm_reserv_broken, 0, "Cumulative number of broken reservations");
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static long vm_reserv_freed;
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SYSCTL_LONG(_vm_reserv, OID_AUTO, freed, CTLFLAG_RD,
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&vm_reserv_freed, 0, "Cumulative number of freed reservations");
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static int sysctl_vm_reserv_partpopq(SYSCTL_HANDLER_ARGS);
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SYSCTL_OID(_vm_reserv, OID_AUTO, partpopq, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0,
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sysctl_vm_reserv_partpopq, "A", "Partially-populated reservation queues");
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static long vm_reserv_reclaimed;
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SYSCTL_LONG(_vm_reserv, OID_AUTO, reclaimed, CTLFLAG_RD,
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&vm_reserv_reclaimed, 0, "Cumulative number of reclaimed reservations");
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static void vm_reserv_depopulate(vm_reserv_t rv);
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static vm_reserv_t vm_reserv_from_page(vm_page_t m);
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static boolean_t vm_reserv_has_pindex(vm_reserv_t rv,
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vm_pindex_t pindex);
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static void vm_reserv_populate(vm_reserv_t rv);
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static void vm_reserv_reclaim(vm_reserv_t rv);
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/*
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* Describes the current state of the partially-populated reservation queue.
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*/
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static int
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sysctl_vm_reserv_partpopq(SYSCTL_HANDLER_ARGS)
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{
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struct sbuf sbuf;
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vm_reserv_t rv;
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int counter, error, level, unused_pages;
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sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
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sbuf_printf(&sbuf, "\nLEVEL SIZE NUMBER\n\n");
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for (level = -1; level <= VM_NRESERVLEVEL - 2; level++) {
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counter = 0;
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unused_pages = 0;
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mtx_lock(&vm_page_queue_free_mtx);
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TAILQ_FOREACH(rv, &vm_rvq_partpop/*[level]*/, partpopq) {
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counter++;
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unused_pages += VM_LEVEL_0_NPAGES - rv->popcnt;
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}
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mtx_unlock(&vm_page_queue_free_mtx);
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sbuf_printf(&sbuf, "%5.5d: %6.6dK, %6.6d\n", level,
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unused_pages * (PAGE_SIZE / 1024), counter);
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}
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error = sbuf_finish(&sbuf);
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sbuf_delete(&sbuf);
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return (error);
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}
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/*
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* Reduces the given reservation's population count. If the population count
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* becomes zero, the reservation is destroyed. Additionally, moves the
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* reservation to the tail of the partially-populated reservations queue if the
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* population count is non-zero.
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*
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* The free page queue lock must be held.
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*/
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static void
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vm_reserv_depopulate(vm_reserv_t rv)
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{
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mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
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KASSERT(rv->object != NULL,
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("vm_reserv_depopulate: reserv %p is free", rv));
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KASSERT(rv->popcnt > 0,
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("vm_reserv_depopulate: reserv %p's popcnt is corrupted", rv));
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if (rv->inpartpopq) {
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TAILQ_REMOVE(&vm_rvq_partpop, rv, partpopq);
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rv->inpartpopq = FALSE;
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}
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rv->popcnt--;
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if (rv->popcnt == 0) {
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LIST_REMOVE(rv, objq);
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rv->object = NULL;
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vm_phys_free_pages(rv->pages, VM_LEVEL_0_ORDER);
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vm_reserv_freed++;
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} else {
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rv->inpartpopq = TRUE;
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TAILQ_INSERT_TAIL(&vm_rvq_partpop, rv, partpopq);
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}
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}
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/*
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* Returns the reservation to which the given page might belong.
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*/
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static __inline vm_reserv_t
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vm_reserv_from_page(vm_page_t m)
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{
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return (&vm_reserv_array[VM_PAGE_TO_PHYS(m) >> VM_LEVEL_0_SHIFT]);
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}
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/*
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* Returns TRUE if the given reservation contains the given page index and
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* FALSE otherwise.
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*/
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static __inline boolean_t
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vm_reserv_has_pindex(vm_reserv_t rv, vm_pindex_t pindex)
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{
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return (((pindex - rv->pindex) & ~(VM_LEVEL_0_NPAGES - 1)) == 0);
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}
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/*
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* Increases the given reservation's population count. Moves the reservation
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* to the tail of the partially-populated reservation queue.
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*
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* The free page queue must be locked.
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*/
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static void
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vm_reserv_populate(vm_reserv_t rv)
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{
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mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
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KASSERT(rv->object != NULL,
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("vm_reserv_populate: reserv %p is free", rv));
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KASSERT(rv->popcnt < VM_LEVEL_0_NPAGES,
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("vm_reserv_populate: reserv %p is already full", rv));
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if (rv->inpartpopq) {
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TAILQ_REMOVE(&vm_rvq_partpop, rv, partpopq);
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rv->inpartpopq = FALSE;
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}
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rv->popcnt++;
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if (rv->popcnt < VM_LEVEL_0_NPAGES) {
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rv->inpartpopq = TRUE;
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TAILQ_INSERT_TAIL(&vm_rvq_partpop, rv, partpopq);
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}
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}
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/*
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* Allocates a page from an existing or newly-created reservation.
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*
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* The object and free page queue must be locked.
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*/
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vm_page_t
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vm_reserv_alloc_page(vm_object_t object, vm_pindex_t pindex)
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{
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vm_page_t m, mpred, msucc;
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vm_pindex_t first, leftcap, rightcap;
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vm_reserv_t rv;
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mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
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/*
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* Is a reservation fundamentally not possible?
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*/
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VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
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if (pindex < VM_RESERV_INDEX(object, pindex) ||
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pindex >= object->size)
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return (NULL);
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/*
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* Look for an existing reservation.
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*/
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msucc = NULL;
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mpred = object->root;
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while (mpred != NULL) {
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KASSERT(mpred->pindex != pindex,
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("vm_reserv_alloc_page: pindex already allocated"));
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rv = vm_reserv_from_page(mpred);
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if (rv->object == object && vm_reserv_has_pindex(rv, pindex)) {
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m = &rv->pages[VM_RESERV_INDEX(object, pindex)];
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/* Handle vm_page_rename(m, new_object, ...). */
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if ((m->flags & (PG_CACHED | PG_FREE)) == 0)
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return (NULL);
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vm_reserv_populate(rv);
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return (m);
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} else if (mpred->pindex < pindex) {
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if (msucc != NULL ||
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(msucc = TAILQ_NEXT(mpred, listq)) == NULL)
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break;
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KASSERT(msucc->pindex != pindex,
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("vm_reserv_alloc_page: pindex already allocated"));
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rv = vm_reserv_from_page(msucc);
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if (rv->object == object &&
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vm_reserv_has_pindex(rv, pindex)) {
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m = &rv->pages[VM_RESERV_INDEX(object, pindex)];
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/* Handle vm_page_rename(m, new_object, ...). */
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if ((m->flags & (PG_CACHED | PG_FREE)) == 0)
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return (NULL);
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vm_reserv_populate(rv);
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return (m);
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} else if (pindex < msucc->pindex)
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break;
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} else if (msucc == NULL) {
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msucc = mpred;
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mpred = TAILQ_PREV(msucc, pglist, listq);
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continue;
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}
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msucc = NULL;
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mpred = object->root = vm_page_splay(pindex, object->root);
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}
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/*
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* Determine the first index to the left that can be used.
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*/
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if (mpred == NULL)
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leftcap = 0;
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else if ((rv = vm_reserv_from_page(mpred))->object != object)
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leftcap = mpred->pindex + 1;
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else
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leftcap = rv->pindex + VM_LEVEL_0_NPAGES;
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/*
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* Determine the first index to the right that cannot be used.
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*/
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if (msucc == NULL)
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rightcap = pindex + VM_LEVEL_0_NPAGES;
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else if ((rv = vm_reserv_from_page(msucc))->object != object)
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rightcap = msucc->pindex;
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else
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rightcap = rv->pindex;
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/*
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* Determine if a reservation fits between the first index to
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* the left that can be used and the first index to the right
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* that cannot be used.
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*/
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first = pindex - VM_RESERV_INDEX(object, pindex);
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if (first < leftcap || first + VM_LEVEL_0_NPAGES > rightcap)
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return (NULL);
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/*
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* Would a new reservation extend past the end of the given object?
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*/
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if (object->size < first + VM_LEVEL_0_NPAGES) {
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/*
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* Don't allocate a new reservation if the object is a vnode or
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* backed by another object that is a vnode.
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*/
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if (object->type == OBJT_VNODE ||
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(object->backing_object != NULL &&
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object->backing_object->type == OBJT_VNODE))
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return (NULL);
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/* Speculate that the object may grow. */
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}
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/*
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* Allocate a new reservation.
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*/
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m = vm_phys_alloc_pages(VM_FREEPOOL_DEFAULT, VM_LEVEL_0_ORDER);
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if (m != NULL) {
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rv = vm_reserv_from_page(m);
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KASSERT(rv->pages == m,
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("vm_reserv_alloc_page: reserv %p's pages is corrupted",
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rv));
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KASSERT(rv->object == NULL,
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("vm_reserv_alloc_page: reserv %p isn't free", rv));
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LIST_INSERT_HEAD(&object->rvq, rv, objq);
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rv->object = object;
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rv->pindex = first;
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KASSERT(rv->popcnt == 0,
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("vm_reserv_alloc_page: reserv %p's popcnt is corrupted",
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rv));
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KASSERT(!rv->inpartpopq,
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("vm_reserv_alloc_page: reserv %p's inpartpopq is TRUE",
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rv));
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vm_reserv_populate(rv);
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m = &rv->pages[VM_RESERV_INDEX(object, pindex)];
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}
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return (m);
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}
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/*
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* Breaks all reservations belonging to the given object.
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*/
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void
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vm_reserv_break_all(vm_object_t object)
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{
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vm_reserv_t rv;
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int i;
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mtx_lock(&vm_page_queue_free_mtx);
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while ((rv = LIST_FIRST(&object->rvq)) != NULL) {
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KASSERT(rv->object == object,
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("vm_reserv_break_all: reserv %p is corrupted", rv));
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if (rv->inpartpopq) {
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TAILQ_REMOVE(&vm_rvq_partpop, rv, partpopq);
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rv->inpartpopq = FALSE;
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}
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LIST_REMOVE(rv, objq);
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rv->object = NULL;
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for (i = 0; i < VM_LEVEL_0_NPAGES; i++) {
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if ((rv->pages[i].flags & (PG_CACHED | PG_FREE)) != 0)
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vm_phys_free_pages(&rv->pages[i], 0);
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else
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rv->popcnt--;
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}
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KASSERT(rv->popcnt == 0,
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("vm_reserv_break_all: reserv %p's popcnt is corrupted",
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rv));
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vm_reserv_broken++;
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}
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mtx_unlock(&vm_page_queue_free_mtx);
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}
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/*
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* Frees the given page if it belongs to a reservation. Returns TRUE if the
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* page is freed and FALSE otherwise.
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*
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* The free page queue lock must be held.
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*/
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boolean_t
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vm_reserv_free_page(vm_page_t m)
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{
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vm_reserv_t rv;
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mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
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rv = vm_reserv_from_page(m);
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if (rv->object != NULL) {
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vm_reserv_depopulate(rv);
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return (TRUE);
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}
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return (FALSE);
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}
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/*
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* Initializes the reservation management system. Specifically, initializes
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* the reservation array.
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*
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* Requires that vm_page_array and first_page are initialized!
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*/
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void
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vm_reserv_init(void)
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{
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vm_paddr_t paddr;
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int i;
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/*
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* Initialize the reservation array. Specifically, initialize the
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* "pages" field for every element that has an underlying superpage.
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*/
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for (i = 0; phys_avail[i + 1] != 0; i += 2) {
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paddr = roundup2(phys_avail[i], VM_LEVEL_0_SIZE);
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while (paddr + VM_LEVEL_0_SIZE <= phys_avail[i + 1]) {
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vm_reserv_array[paddr >> VM_LEVEL_0_SHIFT].pages =
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PHYS_TO_VM_PAGE(paddr);
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paddr += VM_LEVEL_0_SIZE;
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}
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}
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}
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/*
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* Returns a reservation level if the given page belongs to a fully-populated
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* reservation and -1 otherwise.
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*/
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int
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vm_reserv_level_iffullpop(vm_page_t m)
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{
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vm_reserv_t rv;
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rv = vm_reserv_from_page(m);
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return (rv->popcnt == VM_LEVEL_0_NPAGES ? 0 : -1);
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}
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/*
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* Prepare for the reactivation of a cached page.
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*
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* First, suppose that the given page "m" was allocated individually, i.e., not
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* as part of a reservation, and cached. Then, suppose a reservation
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* containing "m" is allocated by the same object. Although "m" and the
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* reservation belong to the same object, "m"'s pindex may not match the
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* reservation's.
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*
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* The free page queue must be locked.
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*/
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boolean_t
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vm_reserv_reactivate_page(vm_page_t m)
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{
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vm_reserv_t rv;
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int i, m_index;
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mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
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rv = vm_reserv_from_page(m);
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if (rv->object == NULL)
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return (FALSE);
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KASSERT((m->flags & PG_CACHED) != 0,
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("vm_reserv_uncache_page: page %p is not cached", m));
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if (m->object == rv->object &&
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m->pindex - rv->pindex == VM_RESERV_INDEX(m->object, m->pindex))
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vm_reserv_populate(rv);
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else {
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KASSERT(rv->inpartpopq,
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("vm_reserv_uncache_page: reserv %p's inpartpopq is FALSE",
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rv));
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TAILQ_REMOVE(&vm_rvq_partpop, rv, partpopq);
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rv->inpartpopq = FALSE;
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LIST_REMOVE(rv, objq);
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rv->object = NULL;
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/* Don't vm_phys_free_pages(m, 0). */
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m_index = m - rv->pages;
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for (i = 0; i < m_index; i++) {
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if ((rv->pages[i].flags & (PG_CACHED | PG_FREE)) != 0)
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vm_phys_free_pages(&rv->pages[i], 0);
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else
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rv->popcnt--;
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}
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for (i++; i < VM_LEVEL_0_NPAGES; i++) {
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if ((rv->pages[i].flags & (PG_CACHED | PG_FREE)) != 0)
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vm_phys_free_pages(&rv->pages[i], 0);
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else
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rv->popcnt--;
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}
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KASSERT(rv->popcnt == 0,
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("vm_reserv_uncache_page: reserv %p's popcnt is corrupted",
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rv));
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vm_reserv_broken++;
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}
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return (TRUE);
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}
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/*
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* Breaks the given partially-populated reservation, releasing its cached and
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* free pages to the physical memory allocator.
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*
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* The free page queue lock must be held.
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*/
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static void
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vm_reserv_reclaim(vm_reserv_t rv)
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{
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int i;
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mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
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KASSERT(rv->inpartpopq,
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("vm_reserv_reclaim: reserv %p's inpartpopq is corrupted", rv));
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TAILQ_REMOVE(&vm_rvq_partpop, rv, partpopq);
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rv->inpartpopq = FALSE;
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KASSERT(rv->object != NULL,
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("vm_reserv_reclaim: reserv %p is free", rv));
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LIST_REMOVE(rv, objq);
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rv->object = NULL;
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for (i = 0; i < VM_LEVEL_0_NPAGES; i++) {
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if ((rv->pages[i].flags & (PG_CACHED | PG_FREE)) != 0)
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vm_phys_free_pages(&rv->pages[i], 0);
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else
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rv->popcnt--;
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}
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KASSERT(rv->popcnt == 0,
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("vm_reserv_reclaim: reserv %p's popcnt is corrupted", rv));
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vm_reserv_reclaimed++;
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}
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/*
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* Breaks the reservation at the head of the partially-populated reservation
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* queue, releasing its cached and free pages to the physical memory
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* allocator. Returns TRUE if a reservation is broken and FALSE otherwise.
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*
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* The free page queue lock must be held.
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*/
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boolean_t
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vm_reserv_reclaim_inactive(void)
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{
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vm_reserv_t rv;
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mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
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if ((rv = TAILQ_FIRST(&vm_rvq_partpop)) != NULL) {
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vm_reserv_reclaim(rv);
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return (TRUE);
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}
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return (FALSE);
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}
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/*
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* Searches the partially-populated reservation queue for the least recently
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* active reservation with unused pages, i.e., cached or free, that satisfy the
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* given request for contiguous physical memory. If a satisfactory reservation
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* is found, it is broken. Returns TRUE if a reservation is broken and FALSE
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* otherwise.
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*
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* The free page queue lock must be held.
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*/
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boolean_t
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vm_reserv_reclaim_contig(vm_paddr_t size, vm_paddr_t low, vm_paddr_t high,
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unsigned long alignment, unsigned long boundary)
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{
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vm_paddr_t pa, pa_length;
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vm_reserv_t rv;
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int i;
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mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
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if (size > VM_LEVEL_0_SIZE - PAGE_SIZE)
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return (FALSE);
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TAILQ_FOREACH(rv, &vm_rvq_partpop, partpopq) {
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pa = VM_PAGE_TO_PHYS(&rv->pages[VM_LEVEL_0_NPAGES - 1]);
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if (pa + PAGE_SIZE - size < low) {
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/* this entire reservation is too low; go to next */
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continue;
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}
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pa_length = 0;
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for (i = 0; i < VM_LEVEL_0_NPAGES; i++)
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if ((rv->pages[i].flags & (PG_CACHED | PG_FREE)) != 0) {
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pa_length += PAGE_SIZE;
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if (pa_length == PAGE_SIZE) {
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pa = VM_PAGE_TO_PHYS(&rv->pages[i]);
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if (pa + size > high) {
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/* skip to next reservation */
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break;
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} else if (pa < low ||
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(pa & (alignment - 1)) != 0 ||
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((pa ^ (pa + size - 1)) &
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~(boundary - 1)) != 0)
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pa_length = 0;
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} else if (pa_length >= size) {
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vm_reserv_reclaim(rv);
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return (TRUE);
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}
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} else
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pa_length = 0;
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}
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return (FALSE);
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}
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/*
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* Transfers the reservation underlying the given page to a new object.
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*
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* The object must be locked.
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*/
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void
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vm_reserv_rename(vm_page_t m, vm_object_t new_object, vm_object_t old_object,
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vm_pindex_t old_object_offset)
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{
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vm_reserv_t rv;
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VM_OBJECT_LOCK_ASSERT(new_object, MA_OWNED);
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rv = vm_reserv_from_page(m);
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if (rv->object == old_object) {
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mtx_lock(&vm_page_queue_free_mtx);
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if (rv->object == old_object) {
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LIST_REMOVE(rv, objq);
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LIST_INSERT_HEAD(&new_object->rvq, rv, objq);
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rv->object = new_object;
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rv->pindex -= old_object_offset;
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}
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mtx_unlock(&vm_page_queue_free_mtx);
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}
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}
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/*
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* Allocates the virtual and physical memory required by the reservation
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* management system's data structures, in particular, the reservation array.
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*/
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vm_paddr_t
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vm_reserv_startup(vm_offset_t *vaddr, vm_paddr_t end, vm_paddr_t high_water)
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{
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vm_paddr_t new_end;
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size_t size;
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/*
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* Calculate the size (in bytes) of the reservation array. Round up
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* from "high_water" because every small page is mapped to an element
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* in the reservation array based on its physical address. Thus, the
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* number of elements in the reservation array can be greater than the
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* number of superpages.
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*/
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size = howmany(high_water, VM_LEVEL_0_SIZE) * sizeof(struct vm_reserv);
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/*
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* Allocate and map the physical memory for the reservation array. The
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* next available virtual address is returned by reference.
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*/
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new_end = end - round_page(size);
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vm_reserv_array = (void *)(uintptr_t)pmap_map(vaddr, new_end, end,
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VM_PROT_READ | VM_PROT_WRITE);
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bzero(vm_reserv_array, size);
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/*
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* Return the next available physical address.
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*/
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return (new_end);
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}
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#endif /* VM_NRESERVLEVEL > 0 */
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