1993-06-12 14:58:17 +00:00
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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1994-01-14 16:25:31 +00:00
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* Copyright (c) 1994 John S. Dyson
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* All rights reserved.
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1993-06-12 14:58:17 +00:00
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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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1993-10-15 10:07:45 +00:00
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* from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
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1999-08-28 01:08:13 +00:00
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* $FreeBSD$
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1993-06-12 14:58:17 +00:00
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*/
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1993-11-07 17:43:17 +00:00
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#ifndef _MACHINE_VMPARAM_H_
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#define _MACHINE_VMPARAM_H_ 1
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1993-06-12 14:58:17 +00:00
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/*
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* Machine dependent constants for 386.
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*/
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/*
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* Virtual memory related constants, all in bytes
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*/
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1998-06-12 09:10:22 +00:00
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#define MAXTSIZ (128UL*1024*1024) /* max text size */
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1993-06-12 14:58:17 +00:00
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#ifndef DFLDSIZ
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1998-06-12 09:10:22 +00:00
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#define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
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1993-06-12 14:58:17 +00:00
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#endif
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#ifndef MAXDSIZ
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1997-10-27 00:38:46 +00:00
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#define MAXDSIZ (512UL*1024*1024) /* max data size */
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1993-06-12 14:58:17 +00:00
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#endif
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#ifndef DFLSSIZ
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1994-03-21 09:35:24 +00:00
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#define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
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1993-06-12 14:58:17 +00:00
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#endif
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#ifndef MAXSSIZ
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1994-01-03 16:00:52 +00:00
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#define MAXSSIZ (64UL*1024*1024) /* max stack size */
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1993-06-12 14:58:17 +00:00
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#endif
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1994-03-21 09:35:24 +00:00
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#ifndef SGROWSIZ
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#define SGROWSIZ (128UL*1024) /* amount to grow stack */
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#endif
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1993-06-12 14:58:17 +00:00
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2007-05-05 19:50:28 +00:00
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/*
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* The physical address space is densely populated.
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*/
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#define VM_PHYSSEG_DENSE
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2007-06-05 05:17:20 +00:00
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/*
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* The number of PHYSSEG entries must be one greater than the number
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* of phys_avail entries because the phys_avail entry that spans the
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* largest physical address that is accessible by ISA DMA is split
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* into two PHYSSEG entries.
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*/
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#define VM_PHYSSEG_MAX 17
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/*
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Change the management of cached pages (PQ_CACHE) in two fundamental
ways:
(1) Cached pages are no longer kept in the object's resident page
splay tree and memq. Instead, they are kept in a separate per-object
splay tree of cached pages. However, access to this new per-object
splay tree is synchronized by the _free_ page queues lock, not to be
confused with the heavily contended page queues lock. Consequently, a
cached page can be reclaimed by vm_page_alloc(9) without acquiring the
object's lock or the page queues lock.
This solves a problem independently reported by tegge@ and Isilon.
Specifically, they observed the page daemon consuming a great deal of
CPU time because of pages bouncing back and forth between the cache
queue (PQ_CACHE) and the inactive queue (PQ_INACTIVE). The source of
this problem turned out to be a deadlock avoidance strategy employed
when selecting a cached page to reclaim in vm_page_select_cache().
However, the root cause was really that reclaiming a cached page
required the acquisition of an object lock while the page queues lock
was already held. Thus, this change addresses the problem at its
root, by eliminating the need to acquire the object's lock.
Moreover, keeping cached pages in the object's primary splay tree and
memq was, in effect, optimizing for the uncommon case. Cached pages
are reclaimed far, far more often than they are reactivated. Instead,
this change makes reclamation cheaper, especially in terms of
synchronization overhead, and reactivation more expensive, because
reactivated pages will have to be reentered into the object's primary
splay tree and memq.
(2) Cached pages are now stored alongside free pages in the physical
memory allocator's buddy queues, increasing the likelihood that large
allocations of contiguous physical memory (i.e., superpages) will
succeed.
Finally, as a result of this change long-standing restrictions on when
and where a cached page can be reclaimed and returned by
vm_page_alloc(9) are eliminated. Specifically, calls to
vm_page_alloc(9) specifying VM_ALLOC_INTERRUPT can now reclaim and
return a formerly cached page. Consequently, a call to malloc(9)
specifying M_NOWAIT is less likely to fail.
Discussed with: many over the course of the summer, including jeff@,
Justin Husted @ Isilon, peter@, tegge@
Tested by: an earlier version by kris@
Approved by: re (kensmith)
2007-09-25 06:25:06 +00:00
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* Create two free page pools. Since the i386 kernel virtual address
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2007-06-05 05:17:20 +00:00
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* space does not include a mapping onto the machine's entire physical
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* memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
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* pool, VM_FREEPOOL_DEFAULT.
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*/
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Change the management of cached pages (PQ_CACHE) in two fundamental
ways:
(1) Cached pages are no longer kept in the object's resident page
splay tree and memq. Instead, they are kept in a separate per-object
splay tree of cached pages. However, access to this new per-object
splay tree is synchronized by the _free_ page queues lock, not to be
confused with the heavily contended page queues lock. Consequently, a
cached page can be reclaimed by vm_page_alloc(9) without acquiring the
object's lock or the page queues lock.
This solves a problem independently reported by tegge@ and Isilon.
Specifically, they observed the page daemon consuming a great deal of
CPU time because of pages bouncing back and forth between the cache
queue (PQ_CACHE) and the inactive queue (PQ_INACTIVE). The source of
this problem turned out to be a deadlock avoidance strategy employed
when selecting a cached page to reclaim in vm_page_select_cache().
However, the root cause was really that reclaiming a cached page
required the acquisition of an object lock while the page queues lock
was already held. Thus, this change addresses the problem at its
root, by eliminating the need to acquire the object's lock.
Moreover, keeping cached pages in the object's primary splay tree and
memq was, in effect, optimizing for the uncommon case. Cached pages
are reclaimed far, far more often than they are reactivated. Instead,
this change makes reclamation cheaper, especially in terms of
synchronization overhead, and reactivation more expensive, because
reactivated pages will have to be reentered into the object's primary
splay tree and memq.
(2) Cached pages are now stored alongside free pages in the physical
memory allocator's buddy queues, increasing the likelihood that large
allocations of contiguous physical memory (i.e., superpages) will
succeed.
Finally, as a result of this change long-standing restrictions on when
and where a cached page can be reclaimed and returned by
vm_page_alloc(9) are eliminated. Specifically, calls to
vm_page_alloc(9) specifying VM_ALLOC_INTERRUPT can now reclaim and
return a formerly cached page. Consequently, a call to malloc(9)
specifying M_NOWAIT is less likely to fail.
Discussed with: many over the course of the summer, including jeff@,
Justin Husted @ Isilon, peter@, tegge@
Tested by: an earlier version by kris@
Approved by: re (kensmith)
2007-09-25 06:25:06 +00:00
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#define VM_NFREEPOOL 2
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#define VM_FREEPOOL_CACHE 1
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2007-06-05 05:17:20 +00:00
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#define VM_FREEPOOL_DEFAULT 0
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#define VM_FREEPOOL_DIRECT 0
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/*
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* Create two free page lists: VM_FREELIST_DEFAULT is for physical
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* pages that are above the largest physical address that is
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* accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
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* that are below that address.
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*/
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#define VM_NFREELIST 2
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#define VM_FREELIST_DEFAULT 0
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#define VM_FREELIST_ISADMA 1
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/*
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* The largest allocation size is 2MB under PAE and 4MB otherwise.
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*/
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#ifdef PAE
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#define VM_NFREEORDER 10
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#else
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#define VM_NFREEORDER 11
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#endif
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2007-12-27 16:45:39 +00:00
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/*
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2008-03-26 03:12:00 +00:00
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* Enable superpage reservations: 1 level.
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2007-12-27 16:45:39 +00:00
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*/
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#ifndef VM_NRESERVLEVEL
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2008-03-26 03:12:00 +00:00
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#define VM_NRESERVLEVEL 1
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2007-12-27 16:45:39 +00:00
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#endif
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/*
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* Level 0 reservations consist of 512 pages under PAE and 1024 pages
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* otherwise.
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*/
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#ifndef VM_LEVEL_0_ORDER
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#ifdef PAE
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#define VM_LEVEL_0_ORDER 9
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#else
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#define VM_LEVEL_0_ORDER 10
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#endif
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#endif
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2003-10-01 23:46:08 +00:00
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/*
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* Kernel physical load address.
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*/
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#ifndef KERNLOAD
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2008-08-15 20:51:31 +00:00
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#if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST)
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#define KERNLOAD 0
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#else
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2003-10-01 23:46:08 +00:00
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#define KERNLOAD (1 << PDRSHIFT)
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#endif
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2008-08-15 20:51:31 +00:00
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#endif /* !defined(KERNLOAD) */
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2003-10-01 23:46:08 +00:00
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1993-06-12 14:58:17 +00:00
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/*
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1996-04-30 12:02:12 +00:00
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* Virtual addresses of things. Derived from the page directory and
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* page table indexes from pmap.h for precision.
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* Because of the page that is both a PD and PT, it looks a little
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* messy at times, but hey, we'll do anything to save a page :-)
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1993-06-12 14:58:17 +00:00
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*/
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2008-08-15 20:51:31 +00:00
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#ifdef XEN
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#define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START
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#else
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2003-04-07 14:27:19 +00:00
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#define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1)
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2008-08-15 20:51:31 +00:00
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#endif
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1996-04-30 12:02:12 +00:00
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#define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI)
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#define KERNBASE VADDR(KPTDI, 0)
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#define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
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#define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
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2003-02-24 20:29:52 +00:00
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#define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0)
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1996-04-30 12:02:12 +00:00
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2012-06-22 07:16:29 +00:00
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#define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
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#define USRSTACK SHAREDPAGE
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1994-01-14 16:25:31 +00:00
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1996-04-30 12:02:12 +00:00
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#define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
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1993-06-12 14:58:17 +00:00
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#define VM_MIN_ADDRESS ((vm_offset_t)0)
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1998-02-23 07:42:43 +00:00
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/*
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As of r257209, all architectures have defined VM_KMEM_SIZE_SCALE. In other
words, every architecture is now auto-sizing the kmem arena. This revision
changes kmeminit() so that the definition of VM_KMEM_SIZE_SCALE becomes
mandatory and the definition of VM_KMEM_SIZE becomes optional.
Replace or eliminate all existing definitions of VM_KMEM_SIZE. With
auto-sizing enabled, VM_KMEM_SIZE effectively became an alternate spelling
for VM_KMEM_SIZE_MIN on most architectures. Use VM_KMEM_SIZE_MIN for
clarity.
Change kmeminit() so that the effect of defining VM_KMEM_SIZE is similar to
that of setting the tunable vm.kmem_size. Whereas the macros
VM_KMEM_SIZE_{MAX,MIN,SCALE} have had the same effect as the tunables
vm.kmem_size_{max,min,scale}, the effects of VM_KMEM_SIZE and vm.kmem_size
have been distinct. In particular, whereas VM_KMEM_SIZE was overridden by
VM_KMEM_SIZE_{MAX,MIN,SCALE} and vm.kmem_size_{max,min,scale}, vm.kmem_size
was not. Remedy this inconsistency. Now, VM_KMEM_SIZE can be used to set
the size of the kmem arena at compile-time without that value being
overridden by auto-sizing.
Update the nearby comments to reflect the kmem submap being replaced by the
kmem arena. Stop duplicating the auto-sizing formula in every machine-
dependent vmparam.h and place it in kmeminit() where auto-sizing takes
place.
Reviewed by: kib (an earlier version)
Sponsored by: EMC / Isilon Storage Division
2013-11-08 16:25:00 +00:00
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* How many physical pages per kmem arena virtual page.
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1998-02-23 07:42:43 +00:00
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*/
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#ifndef VM_KMEM_SIZE_SCALE
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#define VM_KMEM_SIZE_SCALE (3)
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#endif
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/*
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As of r257209, all architectures have defined VM_KMEM_SIZE_SCALE. In other
words, every architecture is now auto-sizing the kmem arena. This revision
changes kmeminit() so that the definition of VM_KMEM_SIZE_SCALE becomes
mandatory and the definition of VM_KMEM_SIZE becomes optional.
Replace or eliminate all existing definitions of VM_KMEM_SIZE. With
auto-sizing enabled, VM_KMEM_SIZE effectively became an alternate spelling
for VM_KMEM_SIZE_MIN on most architectures. Use VM_KMEM_SIZE_MIN for
clarity.
Change kmeminit() so that the effect of defining VM_KMEM_SIZE is similar to
that of setting the tunable vm.kmem_size. Whereas the macros
VM_KMEM_SIZE_{MAX,MIN,SCALE} have had the same effect as the tunables
vm.kmem_size_{max,min,scale}, the effects of VM_KMEM_SIZE and vm.kmem_size
have been distinct. In particular, whereas VM_KMEM_SIZE was overridden by
VM_KMEM_SIZE_{MAX,MIN,SCALE} and vm.kmem_size_{max,min,scale}, vm.kmem_size
was not. Remedy this inconsistency. Now, VM_KMEM_SIZE can be used to set
the size of the kmem arena at compile-time without that value being
overridden by auto-sizing.
Update the nearby comments to reflect the kmem submap being replaced by the
kmem arena. Stop duplicating the auto-sizing formula in every machine-
dependent vmparam.h and place it in kmeminit() where auto-sizing takes
place.
Reviewed by: kib (an earlier version)
Sponsored by: EMC / Isilon Storage Division
2013-11-08 16:25:00 +00:00
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* Optional floor (in bytes) on the size of the kmem arena.
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*/
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#ifndef VM_KMEM_SIZE_MIN
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#define VM_KMEM_SIZE_MIN (12 * 1024 * 1024)
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#endif
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/*
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* Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
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* kernel map rounded to the nearest multiple of the superpage size.
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1998-02-23 07:42:43 +00:00
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*/
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#ifndef VM_KMEM_SIZE_MAX
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2011-12-10 18:42:00 +00:00
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#define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \
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VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT)
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1997-06-25 20:18:58 +00:00
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#endif
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1993-06-12 14:58:17 +00:00
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1998-02-05 03:32:49 +00:00
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/* initial pagein size of beginning of executable file */
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#ifndef VM_INITIAL_PAGEIN
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#define VM_INITIAL_PAGEIN 16
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#endif
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2011-05-13 19:35:01 +00:00
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#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
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2012-11-10 02:08:40 +00:00
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#ifndef VM_MAX_AUTOTUNE_MAXUSERS
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#define VM_MAX_AUTOTUNE_MAXUSERS 384
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#endif
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1993-11-07 17:43:17 +00:00
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#endif /* _MACHINE_VMPARAM_H_ */
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