64c6d1d2dc
- remove special treatment of pager_map mappings in pmaps. this is
required now, since I've removed the globals that expose the address range.
pager_map now uses pmap_kenter_pa() instead of pmap_enter(), so there's
no longer any need to special-case it.
- eliminate struct uvm_vnode by moving its fields into struct vnode.
- rewrite the pageout path. the pager is now responsible for handling the
high-level requests instead of only getting control after a bunch of work
has already been done on its behalf. this will allow us to UBCify LFS,
which needs tighter control over its pages than other filesystems do.
writing a page to disk no longer requires making it read-only, which
allows us to write wired pages without causing all kinds of havoc.
- use a new PG_PAGEOUT flag to indicate that a page should be freed
on behalf of the pagedaemon when it's unlocked. this flag is very similar
to PG_RELEASED, but unlike PG_RELEASED, PG_PAGEOUT can be cleared if the
pageout fails due to eg. an indirect-block buffer being locked.
this allows us to remove the "version" field from struct vm_page,
and together with shrinking "loan_count" from 32 bits to 16,
struct vm_page is now 4 bytes smaller.
- no longer use PG_RELEASED for swap-backed pages. if the page is busy
because it's being paged out, we can't release the swap slot to be
reallocated until that write is complete, but unlike with vnodes we
don't keep a count of in-progress writes so there's no good way to
know when the write is done. instead, when we need to free a busy
swap-backed page, just sleep until we can get it busy ourselves.
- implement a fast-path for extending writes which allows us to avoid
zeroing new pages. this substantially reduces cpu usage.
- encapsulate the data used by the genfs code in a struct genfs_node,
which must be the first element of the filesystem-specific vnode data
for filesystems which use genfs_{get,put}pages().
- eliminate many of the UVM pagerops, since they aren't needed anymore
now that the pager "put" operation is a higher-level operation.
- enhance the genfs code to allow NFS to use the genfs_{get,put}pages
instead of a modified copy.
- clean up struct vnode by removing all the fields that used to be used by
the vfs_cluster.c code (which we don't use anymore with UBC).
- remove kmem_object and mb_object since they were useless.
instead of allocating pages to these objects, we now just allocate
pages with no object. such pages are mapped in the kernel until they
are freed, so we can use the mapping to find the page to free it.
this allows us to remove splvm() protection in several places.
The sum of all these changes improves write throughput on my
decstation 5000/200 to within 1% of the rate of NetBSD 1.5
and reduces the elapsed time for "make release" of a NetBSD 1.5
source tree on my 128MB pc to 10% less than a 1.5 kernel took.
173 lines
6.2 KiB
C
173 lines
6.2 KiB
C
/* $NetBSD: uvm_pager.h,v 1.24 2001/09/15 20:36:47 chs Exp $ */
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/*
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*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles D. Cranor and
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* Washington University.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from: Id: uvm_pager.h,v 1.1.2.14 1998/01/13 19:00:50 chuck Exp
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*/
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/*
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* Copyright (c) 1990 University of Utah.
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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 Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* @(#)vm_pager.h 8.5 (Berkeley) 7/7/94
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*/
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#ifndef _UVM_UVM_PAGER_H_
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#define _UVM_UVM_PAGER_H_
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/*
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* uvm_pager.h
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*/
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/*
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* forward structure declarations
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*/
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struct uvm_faultinfo;
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/*
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* pager ops
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*/
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struct uvm_pagerops {
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/* init pager */
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void (*pgo_init) __P((void));
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/* add reference to obj */
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void (*pgo_reference)(struct uvm_object *);
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/* drop reference to obj */
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void (*pgo_detach)(struct uvm_object *);
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/* special non-standard fault processing */
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int (*pgo_fault)(struct uvm_faultinfo *, vaddr_t, struct vm_page **,
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int, int, vm_fault_t, vm_prot_t, int);
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/* get/read pages */
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int (*pgo_get)(struct uvm_object *, voff_t, struct vm_page **,
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int *, int, vm_prot_t, int, int);
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/* put/write pages */
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int (*pgo_put)(struct uvm_object *, voff_t, voff_t, int);
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};
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/* pager flags [mostly for flush] */
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#define PGO_CLEANIT 0x001 /* write dirty pages to backing store */
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#define PGO_SYNCIO 0x002 /* if PGO_CLEANIT: use sync I/O? */
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#define PGO_DEACTIVATE 0x004 /* deactivate flushed pages */
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#define PGO_FREE 0x008 /* free flushed pages */
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/* if PGO_FREE is not set then the pages stay where they are. */
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#define PGO_ALLPAGES 0x010 /* flush whole object/get all pages */
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#define PGO_LOCKED 0x040 /* fault data structures are locked [get] */
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#define PGO_OVERWRITE 0x200 /* pages will be overwritten before unlocked */
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#define PGO_WEAK 0x400 /* "weak" put, for nfs */
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#define PGO_PASTEOF 0x800 /* allow allocation of pages past EOF */
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/* page we are not interested in getting */
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#define PGO_DONTCARE ((struct vm_page *) -1L) /* [get only] */
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#ifdef _KERNEL
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/*
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* handle inline options
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*/
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#ifdef UVM_PAGER_INLINE
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#define PAGER_INLINE static __inline
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#else
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#define PAGER_INLINE /* nothing */
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#endif /* UVM_PAGER_INLINE */
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/*
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* prototypes
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*/
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void uvm_pager_init __P((void));
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PAGER_INLINE struct vm_page *uvm_pageratop __P((vaddr_t));
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vaddr_t uvm_pagermapin __P((struct vm_page **, int, int));
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void uvm_pagermapout __P((vaddr_t, int));
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/* Flags to uvm_pagermapin() */
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#define UVMPAGER_MAPIN_WAITOK 0x01 /* it's okay to wait */
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#define UVMPAGER_MAPIN_READ 0x02 /* device -> host */
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#define UVMPAGER_MAPIN_WRITE 0x00 /* host -> device (pseudo flag) */
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/*
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* XXX
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* this is needed until the device strategy interface
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* is changed to do physically-addressed i/o.
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*/
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#ifndef PAGER_MAP_SIZE
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#define PAGER_MAP_SIZE (16 * 1024 * 1024)
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#endif
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#endif /* _KERNEL */
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#endif /* _UVM_UVM_PAGER_H_ */
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