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author | dg <dg@FreeBSD.org> | 1995-07-13 08:48:48 +0000 |
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committer | dg <dg@FreeBSD.org> | 1995-07-13 08:48:48 +0000 |
commit | c8b0a7332c667c4216e12358b63e61fad9031a55 (patch) | |
tree | c6f2eefb41eadd82d51ecb0deced0d6d361765ee /sys/vm/vm_extern.h | |
parent | f4ec3663dfda604a39dab484f7714e57488bc2c4 (diff) | |
download | FreeBSD-src-c8b0a7332c667c4216e12358b63e61fad9031a55.zip FreeBSD-src-c8b0a7332c667c4216e12358b63e61fad9031a55.tar.gz |
NOTE: libkvm, w, ps, 'top', and any other utility which depends on struct
proc or any VM system structure will have to be rebuilt!!!
Much needed overhaul of the VM system. Included in this first round of
changes:
1) Improved pager interfaces: init, alloc, dealloc, getpages, putpages,
haspage, and sync operations are supported. The haspage interface now
provides information about clusterability. All pager routines now take
struct vm_object's instead of "pagers".
2) Improved data structures. In the previous paradigm, there is constant
confusion caused by pagers being both a data structure ("allocate a
pager") and a collection of routines. The idea of a pager structure has
escentially been eliminated. Objects now have types, and this type is
used to index the appropriate pager. In most cases, items in the pager
structure were duplicated in the object data structure and thus were
unnecessary. In the few cases that remained, a un_pager structure union
was created in the object to contain these items.
3) Because of the cleanup of #1 & #2, a lot of unnecessary layering can now
be removed. For instance, vm_object_enter(), vm_object_lookup(),
vm_object_remove(), and the associated object hash list were some of the
things that were removed.
4) simple_lock's removed. Discussion with several people reveals that the
SMP locking primitives used in the VM system aren't likely the mechanism
that we'll be adopting. Even if it were, the locking that was in the code
was very inadequate and would have to be mostly re-done anyway. The
locking in a uni-processor kernel was a no-op but went a long way toward
making the code difficult to read and debug.
5) Places that attempted to kludge-up the fact that we don't have kernel
thread support have been fixed to reflect the reality that we are really
dealing with processes, not threads. The VM system didn't have complete
thread support, so the comments and mis-named routines were just wrong.
We now use tsleep and wakeup directly in the lock routines, for instance.
6) Where appropriate, the pagers have been improved, especially in the
pager_alloc routines. Most of the pager_allocs have been rewritten and
are now faster and easier to maintain.
7) The pagedaemon pageout clustering algorithm has been rewritten and
now tries harder to output an even number of pages before and after
the requested page. This is sort of the reverse of the ideal pagein
algorithm and should provide better overall performance.
8) Unnecessary (incorrect) casts to caddr_t in calls to tsleep & wakeup
have been removed. Some other unnecessary casts have also been removed.
9) Some almost useless debugging code removed.
10) Terminology of shadow objects vs. backing objects straightened out.
The fact that the vm_object data structure escentially had this
backwards really confused things. The use of "shadow" and "backing
object" throughout the code is now internally consistent and correct
in the Mach terminology.
11) Several minor bug fixes, including one in the vm daemon that caused
0 RSS objects to not get purged as intended.
12) A "default pager" has now been created which cleans up the transition
of objects to the "swap" type. The previous checks throughout the code
for swp->pg_data != NULL were really ugly. This change also provides
the rudiments for future backing of "anonymous" memory by something
other than the swap pager (via the vnode pager, for example), and it
allows the decision about which of these pagers to use to be made
dynamically (although will need some additional decision code to do
this, of course).
13) (dyson) MAP_COPY has been deprecated and the corresponding "copy
object" code has been removed. MAP_COPY was undocumented and non-
standard. It was furthermore broken in several ways which caused its
behavior to degrade to MAP_PRIVATE. Binaries that use MAP_COPY will
continue to work correctly, but via the slightly different semantics
of MAP_PRIVATE.
14) (dyson) Sharing maps have been removed. It's marginal usefulness in a
threads design can be worked around in other ways. Both #12 and #13
were done to simplify the code and improve readability and maintain-
ability. (As were most all of these changes)
TODO:
1) Rewrite most of the vnode pager to use VOP_GETPAGES/PUTPAGES. Doing
this will reduce the vnode pager to a mere fraction of its current size.
2) Rewrite vm_fault and the swap/vnode pagers to use the clustering
information provided by the new haspage pager interface. This will
substantially reduce the overhead by eliminating a large number of
VOP_BMAP() calls. The VOP_BMAP() filesystem interface should be
improved to provide both a "behind" and "ahead" indication of
contiguousness.
3) Implement the extended features of pager_haspage in swap_pager_haspage().
It currently just says 0 pages ahead/behind.
4) Re-implement the swap device (swstrategy) in a more elegant way, perhaps
via a much more general mechanism that could also be used for disk
striping of regular filesystems.
5) Do something to improve the architecture of vm_object_collapse(). The
fact that it makes calls into the swap pager and knows too much about
how the swap pager operates really bothers me. It also doesn't allow
for collapsing of non-swap pager objects ("unnamed" objects backed by
other pagers).
Diffstat (limited to 'sys/vm/vm_extern.h')
-rw-r--r-- | sys/vm/vm_extern.h | 25 |
1 files changed, 2 insertions, 23 deletions
diff --git a/sys/vm/vm_extern.h b/sys/vm/vm_extern.h index db93e13..71c5180 100644 --- a/sys/vm/vm_extern.h +++ b/sys/vm/vm_extern.h @@ -31,14 +31,13 @@ * SUCH DAMAGE. * * @(#)vm_extern.h 8.2 (Berkeley) 1/12/94 - * $Id: vm_extern.h,v 1.15 1995/05/14 03:00:09 davidg Exp $ + * $Id: vm_extern.h,v 1.16 1995/07/10 08:53:16 davidg Exp $ */ #ifndef _VM_EXTERN_H_ #define _VM_EXTERN_H_ struct buf; -struct loadavg; struct proc; struct vmspace; struct vmtotal; @@ -50,17 +49,6 @@ void chgkprot __P((caddr_t, int, int)); #endif -/* - * Try to get semi-meaningful wait messages into thread_sleep... - */ -void thread_sleep_ __P((int, simple_lock_t, char *)); - -#if __GNUC__ >= 2 -#define thread_sleep(a,b,c) thread_sleep_((a), (b), __FUNCTION__) -#else -#define thread_sleep(a,b,c) thread_sleep_((a), (b), "vmslp") -#endif - #ifdef KERNEL extern int indent; @@ -79,13 +67,10 @@ int swapon __P((struct proc *, void *, int *)); #endif -void assert_wait __P((int, boolean_t)); void faultin __P((struct proc *p)); int grow __P((struct proc *, u_int)); void iprintf __P((const char *,...)); int kernacc __P((caddr_t, int, int)); -int kinfo_loadavg __P((int, char *, int *, int, int *)); -int kinfo_meter __P((int, caddr_t, int *, int, int *)); vm_offset_t kmem_alloc __P((vm_map_t, vm_size_t)); vm_offset_t kmem_alloc_pageable __P((vm_map_t, vm_size_t)); vm_offset_t kmem_alloc_wait __P((vm_map_t, vm_size_t)); @@ -94,17 +79,12 @@ void kmem_free_wakeup __P((vm_map_t, vm_offset_t, vm_size_t)); void kmem_init __P((vm_offset_t, vm_offset_t)); vm_offset_t kmem_malloc __P((vm_map_t, vm_size_t, boolean_t)); vm_map_t kmem_suballoc __P((vm_map_t, vm_offset_t *, vm_offset_t *, vm_size_t, boolean_t)); -void loadav __P((struct loadavg *)); void munmapfd __P((struct proc *, int)); int pager_cache __P((vm_object_t, boolean_t)); -void sched __P((void)); int swaponvp __P((struct proc *, struct vnode *, dev_t , u_long )); void swapout __P((struct proc *)); void swapout_procs __P((void)); void swstrategy __P((struct buf *)); -void thread_block __P((char *)); -void thread_sleep __P((int, simple_lock_t, boolean_t)); -void thread_wakeup __P((int)); int useracc __P((caddr_t, int, int)); int vm_fault __P((vm_map_t, vm_offset_t, vm_prot_t, boolean_t)); void vm_fault_copy_entry __P((vm_map_t, vm_map_t, vm_map_entry_t, vm_map_entry_t)); @@ -121,10 +101,9 @@ struct vmspace *vmspace_alloc __P((vm_offset_t, vm_offset_t, int)); struct vmspace *vmspace_fork __P((struct vmspace *)); void vmspace_free __P((struct vmspace *)); void vmtotal __P((struct vmtotal *)); -vm_pager_t vnode_pager_alloc __P((void *, vm_offset_t, vm_prot_t, vm_offset_t)); void vnode_pager_setsize __P((struct vnode *, u_long)); void vnode_pager_umount __P((struct mount *)); -boolean_t vnode_pager_uncache __P((struct vnode *)); +void vnode_pager_uncache __P((struct vnode *)); void vslock __P((caddr_t, u_int)); void vsunlock __P((caddr_t, u_int, int)); |