7fd701e0fa
default free list, and 0 - N additional free list, in order of descending priority. A new page allocation function, uvm_pagealloc_strat(), has been added, providing three page allocation strategies: - normal: high -> low priority free list walk, taking the page off the first free list that has one. - only: attempt to allocate a page only from the specified free list, failing if that free list has none available. - fallback: if `only' fails, fall back on `normal'. uvm_pagealloc(...) is provided for normal use (and is a synonym for uvm_pagealloc_strat(..., UVM_PGA_STRAT_NORMAL, 0); the free list argument is ignored for the `normal' case). uvm_page_physload() now specified which free list the pages will be loaded onto. This means that some platforms which have multiple physical memory segments may define additional vm_physsegs if they wish to break individual physical segments into differing priorities. Machine-dependent code must define _at least_ the following constants in <machine/vmparam.h>: VM_NFREELIST: the number of free lists the system will have VM_FREELIST_DEFAULT: the default freelist (should always be 0, but is defined in machdep code so that it's with all of the other free list-related constants). Additional free list names may be defined by machine-dependent code, but they will only be used by machine-dependent code (e.g. for loading the vm_physsegs).
189 lines
5.6 KiB
C
189 lines
5.6 KiB
C
/* $NetBSD: uvm.h,v 1.10 1998/07/08 04:28:27 thorpej Exp $ */
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/*
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* XXXCDC: "ROUGH DRAFT" QUALITY UVM PRE-RELEASE FILE!
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* >>>USE AT YOUR OWN RISK, WORK IS NOT FINISHED<<<
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*/
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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.h,v 1.1.2.14 1998/02/02 20:07:19 chuck Exp
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*/
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#ifndef _UVM_UVM_H_
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#define _UVM_UVM_H_
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#if defined(_KERNEL) && !defined(_LKM)
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#include "opt_lockdebug.h"
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#include "opt_uvmhist.h"
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#endif
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#include <uvm/uvm_extern.h>
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#include <uvm/uvm_stat.h>
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/*
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* pull in prototypes
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*/
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#include <uvm/uvm_amap.h>
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#include <uvm/uvm_aobj.h>
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#include <uvm/uvm_fault.h>
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#include <uvm/uvm_glue.h>
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#include <uvm/uvm_km.h>
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#include <uvm/uvm_loan.h>
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#include <uvm/uvm_map.h>
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#include <uvm/uvm_object.h>
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#include <uvm/uvm_page.h>
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#include <uvm/uvm_pager.h>
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#include <uvm/uvm_pdaemon.h>
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#include <uvm/uvm_swap.h>
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/*
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* pull in VM_NFREELIST
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*/
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#include <machine/vmparam.h>
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/*
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* uvm structure (vm global state: collected in one structure for ease
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* of reference...)
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*/
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struct uvm {
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/* vm_page related parameters */
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/* vm_page queues */
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struct pglist page_free[VM_NFREELIST]; /* unallocated pages */
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struct pglist page_active; /* allocated pages, in use */
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struct pglist page_inactive_swp;/* pages inactive (reclaim or free) */
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struct pglist page_inactive_obj;/* pages inactive (reclaim or free) */
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simple_lock_data_t pageqlock; /* lock for active/inactive page q */
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simple_lock_data_t fpageqlock; /* lock for free page q */
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/* page daemon trigger */
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int pagedaemon; /* daemon sleeps on this */
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struct proc *pagedaemon_proc; /* daemon's pid */
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simple_lock_data_t pagedaemon_lock;
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/* page hash */
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struct pglist *page_hash; /* page hash table (vp/off->page) */
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int page_nhash; /* number of buckets */
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int page_hashmask; /* hash mask */
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simple_lock_data_t hashlock; /* lock on page_hash array */
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/* anon stuff */
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struct vm_anon *afree; /* anon free list */
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simple_lock_data_t afreelock; /* lock on anon free list */
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/* static kernel map entry pool */
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vm_map_entry_t kentry_free; /* free page pool */
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simple_lock_data_t kentry_lock;
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/* aio_done is locked by uvm.pagedaemon_lock and splbio! */
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struct uvm_aiohead aio_done; /* done async i/o reqs */
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/* pager VM area bounds */
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vm_offset_t pager_sva; /* start of pager VA area */
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vm_offset_t pager_eva; /* end of pager VA area */
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/* kernel object: to support anonymous pageable kernel memory */
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struct uvm_object *kernel_object;
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};
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extern struct uvm uvm;
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/*
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* historys
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*/
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UVMHIST_DECL(maphist);
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UVMHIST_DECL(pdhist);
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/*
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* vm_map_entry etype bits:
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*/
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#define UVM_ET_OBJ 0x01 /* it is a uvm_object */
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#define UVM_ET_MAP 0x02 /* it is a vm_map */
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#define UVM_ET_SUBMAP 0x04 /* it is a submap (MAP must be 1 too) */
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#define UVM_ET_COPYONWRITE 0x08 /* copy_on_write */
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#define UVM_ET_NEEDSCOPY 0x10 /* needs_copy */
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#define UVM_ET_ISOBJ(E) (((E)->etype & UVM_ET_OBJ) != 0)
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#define UVM_ET_ISMAP(E) (((E)->etype & UVM_ET_MAP) != 0)
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#define UVM_ET_ISSUBMAP(E) (((E)->etype & UVM_ET_SUBMAP) != 0)
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#define UVM_ET_ISCOPYONWRITE(E) (((E)->etype & UVM_ET_COPYONWRITE) != 0)
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#define UVM_ET_ISNEEDSCOPY(E) (((E)->etype & UVM_ET_NEEDSCOPY) != 0)
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/*
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* macros
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*/
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/*
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* UVM_UNLOCK_AND_WAIT: atomic unlock+wait... front end for the
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* (poorly named) thread_sleep_msg function.
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*/
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#if NCPU > 1 || defined(LOCKDEBUG)
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#define UVM_UNLOCK_AND_WAIT(event,lock,intr,msg, timo) \
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thread_sleep_msg(event,lock,intr,msg, timo)
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#else
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#define UVM_UNLOCK_AND_WAIT(event,lock,intr,msg, timo) \
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thread_sleep_msg(event,NULL,intr,msg, timo)
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#endif
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/*
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* UVM_PAGE_OWN: track page ownership (only if UVM_PAGE_TRKOWN)
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*/
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#if defined(UVM_PAGE_TRKOWN)
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#define UVM_PAGE_OWN(PG, TAG) uvm_page_own(PG, TAG)
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#else /* UVM_PAGE_TRKOWN */
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#define UVM_PAGE_OWN(PG, TAG) /* nothing */
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#endif /* UVM_PAGE_TRKOWN */
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/*
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* pull in inlines
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*/
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#include <uvm/uvm_amap_i.h>
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#include <uvm/uvm_fault_i.h>
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#include <uvm/uvm_map_i.h>
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#include <uvm/uvm_page_i.h>
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#include <uvm/uvm_pager_i.h>
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#endif /* _UVM_UVM_H_ */
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