5f51836645
originally inspired by the Solaris vmem detailed in the proceedings of usenix 2001. The NetBSD version was heavily refactored for bugs and simplicity. - Use this resource allocator to allocate the buffer and transient maps. Buffer cache defrags are reduced by 25% when used by filesystems with mixed block sizes. Ultimately this may permit dynamic buffer cache sizing on low KVA machines. Discussed with: alc, kib, attilio Tested by: pho Sponsored by: EMC / Isilon Storage Division
216 lines
6.7 KiB
C
216 lines
6.7 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. 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 Mach Operating System project at Carnegie-Mellon University.
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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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* 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: @(#)vm_init.c 8.1 (Berkeley) 6/11/93
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* Initialize the Virtual Memory subsystem.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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/proc.h>
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#include <sys/rwlock.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/selinfo.h>
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#include <sys/pipe.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/vmem.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_kern.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_map.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_extern.h>
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long physmem;
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static int exec_map_entries = 16;
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TUNABLE_INT("vm.exec_map_entries", &exec_map_entries);
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SYSCTL_INT(_vm, OID_AUTO, exec_map_entries, CTLFLAG_RD, &exec_map_entries, 0,
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"Maximum number of simultaneous execs");
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/*
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* System initialization
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*/
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static void vm_mem_init(void *);
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SYSINIT(vm_mem, SI_SUB_VM, SI_ORDER_FIRST, vm_mem_init, NULL);
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/*
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* vm_init initializes the virtual memory system.
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* This is done only by the first cpu up.
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*
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* The start and end address of physical memory is passed in.
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*/
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/* ARGSUSED*/
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static void
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vm_mem_init(dummy)
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void *dummy;
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{
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/*
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* Initializes resident memory structures. From here on, all physical
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* memory is accounted for, and we use only virtual addresses.
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*/
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vm_set_page_size();
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virtual_avail = vm_page_startup(virtual_avail);
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/*
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* Initialize other VM packages
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*/
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vmem_startup();
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vm_object_init();
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vm_map_startup();
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kmem_init(virtual_avail, virtual_end);
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pmap_init();
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vm_pager_init();
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}
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void
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vm_ksubmap_init(struct kva_md_info *kmi)
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{
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vm_offset_t firstaddr;
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caddr_t v;
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vm_size_t size = 0;
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long physmem_est;
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vm_offset_t minaddr;
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vm_offset_t maxaddr;
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vm_map_t clean_map;
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/*
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* Allocate space for system data structures.
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* The first available kernel virtual address is in "v".
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* As pages of kernel virtual memory are allocated, "v" is incremented.
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* As pages of memory are allocated and cleared,
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* "firstaddr" is incremented.
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* An index into the kernel page table corresponding to the
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* virtual memory address maintained in "v" is kept in "mapaddr".
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*/
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/*
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* Make two passes. The first pass calculates how much memory is
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* needed and allocates it. The second pass assigns virtual
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* addresses to the various data structures.
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*/
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firstaddr = 0;
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again:
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v = (caddr_t)firstaddr;
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/*
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* Discount the physical memory larger than the size of kernel_map
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* to avoid eating up all of KVA space.
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*/
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physmem_est = lmin(physmem, btoc(kernel_map->max_offset -
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kernel_map->min_offset));
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v = kern_vfs_bio_buffer_alloc(v, physmem_est);
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/*
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* End of first pass, size has been calculated so allocate memory
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*/
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if (firstaddr == 0) {
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size = (vm_size_t)v;
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firstaddr = kmem_alloc(kernel_map, round_page(size));
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if (firstaddr == 0)
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panic("startup: no room for tables");
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goto again;
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}
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/*
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* End of second pass, addresses have been assigned
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*/
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if ((vm_size_t)((char *)v - firstaddr) != size)
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panic("startup: table size inconsistency");
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size = (long)nbuf * BKVASIZE + (long)nswbuf * MAXPHYS +
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(long)bio_transient_maxcnt * MAXPHYS;
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clean_map = kmem_suballoc(kernel_map, &kmi->clean_sva, &kmi->clean_eva,
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size, TRUE);
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size = (long)nbuf * BKVASIZE;
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kmi->buffer_sva = kmem_alloc_nofault(clean_map, size);
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kmi->buffer_eva = kmi->buffer_sva + size;
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vmem_init(buffer_arena, "buffer arena", kmi->buffer_sva, size,
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PAGE_SIZE, 0, 0);
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size = (long)nswbuf * MAXPHYS;
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swapbkva = kmem_alloc_nofault(clean_map, size);
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if (!swapbkva)
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panic("Not enough clean_map VM space for pager buffers");
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if (bio_transient_maxcnt != 0) {
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size = (long)bio_transient_maxcnt * MAXPHYS;
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vmem_init(transient_arena, "transient arena",
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kmem_alloc_nofault(clean_map, size),
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size, PAGE_SIZE, 0, 0);
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}
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exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
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exec_map_entries * round_page(PATH_MAX + ARG_MAX), FALSE);
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pipe_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, maxpipekva,
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FALSE);
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}
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