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* Fixed type of obreak(). The args struct member name conflicted withBruce Evans1995-11-111-3/+3
| | | | | | | the (better) machine generated one in <sys/sysproto.h>. Notes: svn path=/head/; revision=12206
* Initialize lock struct entries explicitly rather than calling bzero().David Greenman1995-11-061-2/+7
| | | | Notes: svn path=/head/; revision=12128
* Replaced bogus macros for dummy devswitch entries by functions.Bruce Evans1995-11-061-3/+3
| | | | | | | | | | | | | | | | | | | | | These functions went away: enosys (hasn't been used for some time) enxio enodev enoioctl (was used only once, actually for a vop) if_tun.c: Continued cleaning up... conf.h: Probably fixed the type of d_reset_t. It is hard to tell the correct type because there are no non-dummy device reset functions. Removed last vestige of ambiguous sleep message strings. Notes: svn path=/head/; revision=12118
* Greatly simplify the msync code. Eliminate complications in vm_pageoutJohn Dyson1995-11-056-131/+98
| | | | | | | | for msyncing. Remove a bug that manifests itself primarily on NFS (the dirty range on the buffers is not set on msync.) Notes: svn path=/head/; revision=12110
* Move page fixups (pmap_clear_modify, etc) that happen after paging inputDavid Greenman1995-11-022-5/+7
| | | | | | | | | | completes out of vm_fault and into the pagers. This get rid of some redundancy and improves the architecture. Reviewed by: John Dyson <dyson> Notes: svn path=/head/; revision=12006
* Don't pass an extra trailing arg to some functions.Bruce Evans1995-10-301-5/+14
| | | | | | | Added the prototypes that found this bug. Notes: svn path=/head/; revision=11943
* Get rid of machine-dependent NBPG and replace with PAGE_SIZE.John Dyson1995-10-234-20/+20
| | | | Notes: svn path=/head/; revision=11709
* Remove of now unused PG_COPYONWRITE.John Dyson1995-10-231-2/+1
| | | | Notes: svn path=/head/; revision=11708
* First phase of removing the PG_COPYONWRITE flag, and an architecturalJohn Dyson1995-10-233-55/+19
| | | | | | | cleanup of mapping files. Notes: svn path=/head/; revision=11705
* Finalize GETPAGES layering scheme. Move the device GETPAGESJohn Dyson1995-10-231-6/+18
| | | | | | | | interface into specfs code. No need at this point to modify the PUTPAGES stuff except in the layered-type (NULL/UNION) filesystems. Notes: svn path=/head/; revision=11701
* Implement mincore system call.John Dyson1995-10-211-3/+25
| | | | Notes: svn path=/head/; revision=11621
* Fix initialization of "bsize" in vnode_pager_haspage(). It must happenDavid Greenman1995-10-191-5/+3
| | | | | | | | after the check for the mount point still existing or else the system will panic if someone forcibly unmounted the filesystem. Notes: svn path=/head/; revision=11576
* Remove an unnecessary tsleep in the swapin code. This tsleepJohn Dyson1995-10-161-2/+1
| | | | | | | can defer swapping in processes and is just not the right thing to do. Notes: svn path=/head/; revision=11526
* Fix argument passing to the "freeer" routine. Added some prototypes. (bde)David Greenman1995-10-074-15/+20
| | | | | | | | | | Moved extern declaration of swap_pager_full into swap_pager.h and out of the various files that reference it. (davidg) Submitted by: bde & davidg Notes: svn path=/head/; revision=11317
* Avoid a 64bit divide.Poul-Henning Kamp1995-10-061-2/+2
| | | | Notes: svn path=/head/; revision=11260
* Fix pollution of application namespace by declarations of kernelBruce Evans1995-10-052-3/+4
| | | | | | | | | | | | | | | | | functions. The application header <sys/user.h> includes <vm/vm.h> which includes <vm/lock.h>... vm.h: Don't include <machine/cpufunc.h>. It is already included by <sys/systm.h> in the kernel and isn't designed to be included by applications (the 2.1 version causes a syntax error in C++ and the current version has initializers that are invalid in strict C++). lock.h: Only declare kernel functions if KERNEL is defined. Notes: svn path=/head/; revision=11194
* Perform more checking for proper loading of the UPAGES when a processJohn Dyson1995-09-241-13/+19
| | | | | | | | | | | is swapped in. Also, remove unnecessary map locking/unlocking during selection of processes to be swapped out. This code might afford proper panics as opposed to spontaneous reboots on certain systems. This should allow us to debug these problems better. Notes: svn path=/head/; revision=10989
* Significantly simplify the fault clustering code. After some analysis byJohn Dyson1995-09-241-114/+56
| | | | | | | | | | David Greenman, it has been determined that the more sophisticated code only made a very minor difference in fault performance. Therefore, this code eliminates some of the complication of the fault code, decreasing the amount of CPU used to scan shadow chains. Notes: svn path=/head/; revision=10988
* Check that the swap block is valid before including it in a cluster.David Greenman1995-09-241-1/+5
| | | | | | | Submitted by: John Dyson Notes: svn path=/head/; revision=10984
* Check the return value from vm_map_pageable() when mapping the process'sDavid Greenman1995-09-171-4/+8
| | | | | | | | | UPAGES and associated page table page. Panic on error. This is less than optimial and will be fixed in the future, but is better than the old behavior of panicing with a "kernel page directory invalid" in pmap_enter. Notes: svn path=/head/; revision=10835
* Fixed a typo in vm_fault_additional_pages.John Dyson1995-09-141-2/+2
| | | | Notes: svn path=/head/; revision=10728
* Fix really bogus casting of a block number to a long. Also change theJohn Dyson1995-09-121-2/+2
| | | | | | | comparison from a "< 0" to "== -1" like it should be. Notes: svn path=/head/; revision=10702
* Make sure that the prezero flag is cleared when needed.John Dyson1995-09-111-1/+2
| | | | Notes: svn path=/head/; revision=10670
* Fix an error that can cause attempted reading beyond the end of file.John Dyson1995-09-111-3/+11
| | | | Notes: svn path=/head/; revision=10669
* Code cleanup and minor performance improvement in the faultin clusterJohn Dyson1995-09-111-33/+29
| | | | | | | code. Notes: svn path=/head/; revision=10668
* Fixed init functions argument type - caddr_t -> void *. Fixed a couple ofDavid Greenman1995-09-093-15/+15
| | | | | | | compiler warnings. Notes: svn path=/head/; revision=10653
* Fixed a sign reversal problem -- might have cause some Sig-11s thatJohn Dyson1995-09-061-3/+3
| | | | | | | people have been seeing. Notes: svn path=/head/; revision=10579
* Minor performance improvements, additional prototype for additionalJohn Dyson1995-09-063-7/+11
| | | | | | | exported symbol. Notes: svn path=/head/; revision=10576
* Allow the fault code to use additional clustering info from bothJohn Dyson1995-09-043-50/+114
| | | | | | | bmap and the swap pager. Improved fault clustering performance. Notes: svn path=/head/; revision=10556
* Added VOP_GETPAGES/VOP_PUTPAGES and also the "backwards" block countJohn Dyson1995-09-041-6/+6
| | | | | | | for VOP_BMAP. Updated affected filesystems... Notes: svn path=/head/; revision=10551
* Machine independent changes to support pre-zeroed free pages. ThisJohn Dyson1995-09-033-24/+72
| | | | | | | significantly improves demand-zero performance. Notes: svn path=/head/; revision=10548
* Added prototype for new routine "vm_page_set_validclean" and initialJohn Dyson1995-09-031-1/+9
| | | | | | | declarations for the prezeroed pages mechanism. Notes: svn path=/head/; revision=10544
* New subroutine "vm_page_set_validclean" for a vfs_bio improvement.John Dyson1995-09-031-1/+17
| | | | Notes: svn path=/head/; revision=10542
* Reviewed by: julian with quick glances by bruce and othersJulian Elischer1995-08-285-17/+74
| | | | | | | | | | | | | | | | | | | | | | | | | Submitted by: terry (terry lambert) This is a composite of 3 patch sets submitted by terry. they are: New low-level init code that supports loadbal modules better some cleanups in the namei code to help terry in 16-bit character support some changes to the mount-root code to make it a little more modular.. NOTE: mounting root off cdrom or NFS MIGHT be broken as I haven't been able to test those cases.. certainly mounting root of disk still works just fine.. mfs should work but is untested. (tomorrows task) The low level init stuff includes a total rewrite of init_main.c to make it possible for new modules to have an init phase by simply adding an entry to a TEXT_SET (or is it DATA_SET) list. thus a new module can be added to the kernel without editing any other files other than the 'files' file. Notes: svn path=/head/; revision=10358
* Change vm_object_print() to have the correct number and type of argsBruce Evans1995-08-262-5/+11
| | | | | | | for a ddb command. Notes: svn path=/head/; revision=10345
* Change vm_map_print() to have the correct number and type of args forBruce Evans1995-08-262-7/+15
| | | | | | | a ddb command. Notes: svn path=/head/; revision=10344
* Make everything except the unsupported network sources compile cleanlyBruce Evans1995-08-162-4/+4
| | | | | | | with -Wnested-externs. Notes: svn path=/head/; revision=10080
* Eliminate sloppy common-style declarations. There should be none left forBruce Evans1995-07-298-23/+27
| | | | | | | the LINT configuation. Notes: svn path=/head/; revision=9759
* #if 0'd one of the DIAGNOSTIC checks in vm_page_alloc(). It was tooDavid Greenman1995-07-201-1/+3
| | | | | | | expensive for "normal" use. Notes: svn path=/head/; revision=9582
* 1) Merged swpager structure into vm_object.David Greenman1995-07-164-172/+134
| | | | | | | | | 2) Changed swap_pager internal interfaces to cope w/#1. 3) Eliminated object->copy as we no longer have copy objects. 4) Minor stylistic changes. Notes: svn path=/head/; revision=9548
* Added a copyright to this file.David Greenman1995-07-131-0/+33
| | | | Notes: svn path=/head/; revision=9514
* Oops, forgot to add the "default" pager files...David Greenman1995-07-132-0/+143
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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). Notes: svn path=/head/; revision=9513
* NOTE: libkvm, w, ps, 'top', and any other utility which depends on structDavid Greenman1995-07-1328-3050/+1073
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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). Notes: svn path=/head/; revision=9507
* swapout_threads() -> swapout_procs().David Greenman1995-07-103-6/+6
| | | | Notes: svn path=/head/; revision=9468
* Increased global RSS limit to total RAM.David Greenman1995-07-101-2/+2
| | | | Notes: svn path=/head/; revision=9467
* Moved call to VOP_GETATTR() out of vnode_pager_alloc() and into the placesDavid Greenman1995-07-092-39/+31
| | | | | | | | | that call vnode_pager_alloc() so that a failure return can be dealt with. This fixes a panic seen on NFS clients when a file being opened is deleted on the server before the open completes. Notes: svn path=/head/; revision=9456
* Fixed an object allocation race condition that was causing a "objectDavid Greenman1995-07-061-13/+34
| | | | | | | | | deallocated too many times" panic when using NFS. Reviewed by: John Dyson Notes: svn path=/head/; revision=9411
* 1) Converted v_vmdata to v_object.David Greenman1995-06-281-11/+11
| | | | | | | | | | 2) Removed unnecessary vm_object_lookup()/pager_cache(object, TRUE) pairs after vnode_pager_alloc() calls - the object is already guaranteed to be persistent. 3) Removed some gratuitous casts. Notes: svn path=/head/; revision=9356
* Merge RELENG_2_0_5 into HEADRodney W. Grimes1995-06-111-3/+3
| | | | Notes: svn path=/head/; revision=9202
* Remove trailing whitespace.Rodney W. Grimes1995-05-3014-130/+130
| | | | Notes: svn path=/head/; revision=8876
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