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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/swap_pager.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/swap_pager.h')
-rw-r--r-- | sys/vm/swap_pager.h | 35 |
1 files changed, 13 insertions, 22 deletions
diff --git a/sys/vm/swap_pager.h b/sys/vm/swap_pager.h index 5a1393f..a2beaa6 100644 --- a/sys/vm/swap_pager.h +++ b/sys/vm/swap_pager.h @@ -36,7 +36,7 @@ * SUCH DAMAGE. * * from: @(#)swap_pager.h 7.1 (Berkeley) 12/5/90 - * $Id: swap_pager.h,v 1.5 1995/02/02 09:08:09 davidg Exp $ + * $Id: swap_pager.h,v 1.6 1995/05/10 18:56:04 davidg Exp $ */ /* @@ -67,36 +67,27 @@ typedef struct swblock *sw_blk_t; * Swap pager private data. */ struct swpager { - vm_size_t sw_osize; /* size of object we are backing (bytes) */ int sw_nblocks; /* number of blocks in list (sw_blk_t units) */ int sw_allocsize; /* amount of space actually allocated */ sw_blk_t sw_blocks; /* pointer to list of swap blocks */ - short sw_flags; /* flags */ short sw_poip; /* pageouts in progress */ short sw_piip; /* pageins in progress */ }; typedef struct swpager *sw_pager_t; -#define SW_WANTED 0x01 -#define SW_NAMED 0x02 - #ifdef KERNEL - -void swap_pager_init(void); -vm_pager_t swap_pager_alloc(void *, vm_size_t, vm_prot_t, vm_offset_t); -void swap_pager_dealloc(vm_pager_t); -boolean_t swap_pager_getpage(vm_pager_t, vm_page_t, boolean_t); -boolean_t swap_pager_putpage(vm_pager_t, vm_page_t, boolean_t); -boolean_t swap_pager_getmulti(vm_pager_t, vm_page_t *, int, int, boolean_t); -boolean_t swap_pager_haspage(vm_pager_t, vm_offset_t); -int swap_pager_io(sw_pager_t, vm_page_t *, int, int, int); -void swap_pager_iodone(struct buf *); -boolean_t swap_pager_clean(); -void swap_pager_copy __P((vm_pager_t, vm_offset_t, vm_pager_t, vm_offset_t, vm_offset_t)); -void swap_pager_freespace __P((vm_pager_t, vm_offset_t, vm_offset_t)); - -extern struct pagerops swappagerops; - +void swap_pager_init __P((void)); +vm_object_t swap_pager_alloc __P((void *, vm_size_t, vm_prot_t, vm_offset_t)); +void swap_pager_dealloc __P((vm_object_t)); +int swap_pager_getpages __P((vm_object_t, vm_page_t *, int, int)); +int swap_pager_putpages __P((vm_object_t, vm_page_t *, int, boolean_t, int *)); +boolean_t swap_pager_haspage __P((vm_object_t, vm_offset_t, int *, int *)); +void swap_pager_sync __P((void)); +void swap_pager_iodone __P((struct buf *)); +int swap_pager_swp_alloc __P((vm_object_t, int)); +void swap_pager_copy __P((vm_object_t, vm_offset_t, vm_object_t, vm_offset_t, vm_offset_t)); +void swap_pager_freespace __P((vm_object_t, vm_offset_t, vm_offset_t)); +void swap_pager_swap_init __P((void)); #endif #endif /* _SWAP_PAGER_ */ |