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* Get rid of the ad-hoc memory allocator for vm_map_entries, in lieu ofdyson1997-08-051-3/+2
| | | | | a simple, clean zone type allocator. This new allocator will also be used for machine dependent pmap PV entries.
* Kill some stale leftovers from the earlier attempts at SMP per-cpu pagespeter1997-06-221-6/+1
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* Remove a window during running down a file vnode. Also, the OBJ_DEADdyson1997-06-221-1/+4
| | | | | | flag wasn't being respected during vref(), et. al. Note that this isn't the eventual fix for the locking problem. Fine grained SMP in the VM and VFS code will require (lots) more work.
* Update the #include "opt_smpxxx.h" includes - opt_smp.h isn't neededpeter1997-05-291-1/+2
| | | | very much in the generic parts of the kernel now.
* Man the liferafts! Here comes the long awaited SMP -> -current merge!peter1997-04-261-1/+5
| | | | | | | | | | | | | | | | There are various options documented in i386/conf/LINT, there is more to come over the next few days. The kernel should run pretty much "as before" without the options to activate SMP mode. There are a handful of known "loose ends" that need to be fixed, but have been put off since the SMP kernel is in a moderately good condition at the moment. This commit is the result of the tinkering and testing over the last 14 months by many people. A special thanks to Steve Passe for implementing the APIC code!
* Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are notpeter1997-02-221-1/+1
| | | | ready for it yet.
* This is the kernel Lite/2 commit. There are some requisite userlanddyson1997-02-101-6/+13
| | | | | | | | | | | | | | | changes, so don't expect to be able to run the kernel as-is (very well) without the appropriate Lite/2 userland changes. The system boots and can mount UFS filesystems. Untested: ext2fs, msdosfs, NFS Known problems: Incorrect Berkeley ID strings in some files. Mount_std mounts will not work until the getfsent library routine is changed. Reviewed by: various people Submitted by: Jeffery Hsu <hsu@freebsd.org>
* Make MADV_FREE work better. Specifically, it did not wait fordyson1997-01-201-13/+46
| | | | | | | the page to be unbusy, and it caused some algorithmic problems as a result. There were some other problems with it also, so this is a general cleanup of the code. Submitted by: Douglas Crosher <dtc@scrooge.ee.swin.oz.au> and myself.
* Change the map entry flags from bitfields to bitmasks. Allowsdyson1997-01-161-1/+1
| | | | for some code simplification.
* Make the long-awaited change from $Id$ to $FreeBSD$jkh1997-01-141-1/+1
| | | | | | | | This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
* Undo the collapse breakage (swap space usage problem.)dyson1997-01-031-7/+1
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* Guess what? We left alot of the old collapse code that is not neededdyson1997-01-011-0/+6
| | | | | | anymore with the "full" collapse fix that we added about 1yr ago!!! The code has been removed by optioning it out for now, so we can put it back in ASAP if any problems are found.
* A very significant improvement in the management of process mapsdyson1996-12-311-3/+8
| | | | | | | | | | | | | | and objects. Previously, "fancy" memory management techniques such as that used by the M3 RTS would have the tendancy of chopping up processes allocated memory into lots of little objects. Alan has come up with some improvements to migtigate the sitution to the point where even the M3 RTS only has one object for bss and it's managed memory (when running CVSUP.) (There are still cases where the situation isn't improved when the system pages -- but this is much much better for the vast majority of cases.) The system will now be able to much more effectively merge map entries. Submitted by: Alan Cox <alc@cs.rice.edu>
* Reviewed by:dyson1996-09-281-2/+3
| | | | | Submitted by: Obtained from:
* Attached vm ddb commands `show map', `show vmochk', `show object',bde1996-09-141-38/+47
| | | | | | | | | | | | | | | | | `show vmopag', `show page' and `show pageq'. Moved all vm ddb stuff to the ends of the vm source files. Changed printf() to db_printf(), `indent' to db_indent, and iprintf() to db_iprintf() in ddb commands. Moved db_indent and db_iprintf() from vm to ddb. vm_page.c: Don't use __pure. Staticized. db_output.c: Reduced page width from 80 to 79 to inhibit double spacing for long lines (there are still some problems if words are printed across column 79).
* Addition of page coloring support. Various levels of coloring are afforded.dyson1996-09-081-5/+99
| | | | | | The default level works with minimal overhead, but one can also enable full, efficient use of a 512K cache. (Parameters can be generated to support arbitrary cache sizes also.)
* Even though this looks like it, this is not a complex code change.dyson1996-08-211-4/+10
| | | | | | | | | | | | | | | | | The interface into the "VMIO" system has changed to be more consistant and robust. Essentially, it is now no longer necessary to call vn_open to get merged VM/Buffer cache operation, and exceptional conditions such as merged operation of VBLK devices is simpler and more correct. This code corrects a potentially large set of problems including the problems with ktrace output and loaded systems, file create/deletes, etc. Most of the changes to NFS are cosmetic and name changes, eliminating a layer of subroutine calls. The direct calls to vput/vrele have been re-instituted for better cross platform compatibility. Reviewed by: davidg
* Backed out the recent changes/enhancements to the VM code. Thedyson1996-07-301-4/+3
| | | | | | | problem with the 'shell scripts' was found, but there was a 'strange' problem found with a 486 laptop that we could not find. This commit backs the code back to 25-jul, and will be re-entered after the snapshot in smaller (more easily tested) chunks.
* This commit is meant to solve a couple of VM system problems ordyson1996-07-271-3/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | performance issues. 1) The pmap module has had too many inlines, and so the object file is simply bigger than it needs to be. Some common code is also merged into subroutines. 2) Removal of some *evil* PHYS_TO_VM_PAGE macro calls. Unfortunately, a few have needed to be added also. The removal caused the need for more vm_page_lookups. I added lookup hints to minimize the need for the page table lookup operations. 3) Removal of some bogus performance improvements, that mostly made the code more complex (tracking individual page table page updates unnecessarily). Those improvements actually hurt 386 processors perf (not that people who worry about perf use 386 processors anymore :-)). 4) Changed pv queue manipulations/structures to be TAILQ's. 5) The pv queue code has had some performance problems since day one. Some significant scalability issues are resolved by threading the pv entries from the pmap AND the physical address instead of just the physical address. This makes certain pmap operations run much faster. This does not affect most micro-benchmarks, but should help loaded system performance *significantly*. DG helped and came up with most of the solution for this one. 6) Most if not all pmap bit operations follow the pattern: pmap_test_bit(); pmap_clear_bit(); That made for twice the necessary pv list traversal. The pmap interface now supports only pmap_tc_bit type operations: pmap_[test/clear]_modified, pmap_[test/clear]_referenced. Additionally, the modified routine now takes a vm_page_t arg instead of a phys address. This eliminates a PHYS_TO_VM_PAGE operation. 7) Several rewrites of routines that contain redundant code to use common routines, so that there is a greater likelihood of keeping the cache footprint smaller.
* Various bugfixes/cleanups from me and others:dyson1996-06-161-41/+11
| | | | | | | | | | | | 1) Remove potential race conditions on waking up in vm_page_free_wakeup by making sure that it is at splvm(). 2) Fix another bug in vm_map_simplify_entry. 3) Be more complete about converting from default to swap pager when an object grows to be large enough that there can be a problem with data structure allocation under low memory conditions. 4) Make some madvise code more efficient. 5) Added some comments.
* This commit is dual-purpose, to fix more of the pageout daemondyson1996-05-311-2/+3
| | | | | | queue corruption problems, and to apply Gary Palmer's code cleanups. David Greenman helped with these problems also. There is still a hang problem using X in small memory machines.
* Eliminate inefficient check for dirty pages for pages in the PQ_CACHEdyson1996-05-241-1/+14
| | | | | queue. Also, modify the MADV_FREE policy (it probably still isn't the final version.)
* Initial support for MADV_FREE, support for pages that we don't caredyson1996-05-231-56/+12
| | | | | | about the contents anymore. This gives us alot of the advantage of freeing individual pages through munmap, but with almost none of the overhead.
* After reviewing the previous commit to vm_object, the page protectiondyson1996-05-211-3/+1
| | | | is never necessary, not just for PG_FICTICIOUS.
* Don't protect non-managed pages off during object rundown. This fixesdyson1996-05-211-2/+3
| | | | a hang that occurs under certain circumstances when exiting X.
* Initial support for mincore and madvise. Both are almost fullydyson1996-05-191-1/+66
| | | | | supported, except madvise does not page in with MADV_WILLNEED, and MADV_DONTNEED doesn't force dirty pages out.
* This set of commits to the VM system does the following, and containdyson1996-05-181-36/+49
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | contributions or ideas from Stephen McKay <syssgm@devetir.qld.gov.au>, Alan Cox <alc@cs.rice.edu>, David Greenman <davidg@freebsd.org> and me: More usage of the TAILQ macros. Additional minor fix to queue.h. Performance enhancements to the pageout daemon. Addition of a wait in the case that the pageout daemon has to run immediately. Slightly modify the pageout algorithm. Significant revamp of the pmap/fork code: 1) PTE's and UPAGES's are NO LONGER in the process's map. 2) PTE's and UPAGES's reside in their own objects. 3) TOTAL elimination of recursive page table pagefaults. 4) The page directory now resides in the PTE object. 5) Implemented pmap_copy, thereby speeding up fork time. 6) Changed the pv entries so that the head is a pointer and not an entire entry. 7) Significant cleanup of pmap_protect, and pmap_remove. 8) Removed significant amounts of machine dependent fork code from vm_glue. Pushed much of that code into the machine dependent pmap module. 9) Support more completely the reuse of already zeroed pages (Page table pages and page directories) as being already zeroed. Performance and code cleanups in vm_map: 1) Improved and simplified allocation of map entries. 2) Improved vm_map_copy code. 3) Corrected some minor problems in the simplify code. Implemented splvm (combo of splbio and splimp.) The VM code now seldom uses splhigh. Improved the speed of and simplified kmem_malloc. Minor mod to vm_fault to avoid using pre-zeroed pages in the case of objects with backing objects along with the already existant condition of having a vnode. (If there is a backing object, there will likely be a COW... With a COW, it isn't necessary to start with a pre-zeroed page.) Minor reorg of source to perhaps improve locality of ref.
* This fixes kmem_malloc/kmem_free (and malloc/free of objects of > 8K).dyson1996-04-241-6/+9
| | | | | A page index was calculated incorrectly in vm_kern, and vm_object_page_remove removed pages that should not have been.
* Revert to previous calculation of vm_object_cache_max: it simply worksdg1996-03-291-2/+2
| | | | better in most real-world cases.
* VM performance improvements, and reorder some operations in VM faultdyson1996-03-281-2/+5
| | | | | in anticipation of a fix in pmap that will allow the mlock system call to work without panicing the system.
* For Lite2: proc LIST changes.hsu1996-03-111-2/+2
| | | | Reviewed by: davidg & bde
* 1) Eliminate unnecessary bzero of UPAGES.dyson1996-03-021-9/+22
| | | | | 2) Eliminate unnecessary copying of pages during/after forks. 3) Add user map simplification.
* Eliminated many redundant vm_map_lookup operations for vm_mmap.dyson1996-01-191-57/+109
| | | | | | | | | | | | | | | | | | | | | | | | | Speed up for vfs_bio -- addition of a routine bqrelse to greatly diminish overhead for merged cache. Efficiency improvement for vfs_cluster. It used to do alot of redundant calls to cluster_rbuild. Correct the ordering for vrele of .text and release of credentials. Use the selective tlb update for 486/586/P6. Numerous fixes to the size of objects allocated for files. Additionally, fixes in the various pagers. Fixes for proper positioning of vnode_pager_setsize in msdosfs and ext2fs. Fixes in the swap pager for exhausted resources. The pageout code will not as readily thrash. Change the page queue flags (PG_ACTIVE, PG_INACTIVE, PG_FREE, PG_CACHE) into page queue indices (PQ_ACTIVE, PQ_INACTIVE, PQ_FREE, PQ_CACHE), thereby improving efficiency of several routines. Eliminate even more unnecessary vm_page_protect operations. Significantly speed up process forks. Make vm_object_page_clean more efficient, thereby eliminating the pause that happens every 30seconds. Make sequential clustered writes B_ASYNC instead of B_DELWRI even in the case of filesystems mounted async. Fix a panic with busy pages when write clustering is done for non-VMIO buffers.
* Convert DDB to new-style option.wollman1996-01-041-1/+2
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* Increased vm_object_cache_max by about 50% to yield better utilization ofdg1996-01-041-2/+2
| | | | | | memory when lots of small files are cached. Reviewed by: dyson
* Another mega commit to staticize things.phk1995-12-141-16/+24
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* Changes to support 1Tb filesizes. Pages are now named by andyson1995-12-111-97/+72
| | | | (object,index) pair instead of (object,offset) pair.
* Untangled the vm.h include file spaghetti.dg1995-12-071-1/+9
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* Completed function declarations and/or added prototypes.bde1995-12-031-5/+17
| | | | | | | | | Staticized some functions. __purified some functions. Some functions were bogusly declared as returning `const'. This hasn't done anything since gcc-2.5. For later versions of gcc, the equivalent is __attribute__((const)) at the end of function declarations.
* Remove unused vars & funcs, make things static, protoize a little bit.phk1995-11-201-15/+6
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* Greatly simplify the msync code. Eliminate complications in vm_pageoutdyson1995-11-051-110/+61
| | | | | for msyncing. Remove a bug that manifests itself primarily on NFS (the dirty range on the buffers is not set on msync.)
* First phase of removing the PG_COPYONWRITE flag, and an architecturaldyson1995-10-231-10/+1
| | | | cleanup of mapping files.
* Change vm_object_print() to have the correct number and type of argsbde1995-08-261-3/+6
| | | | for a ddb command.
* Make everything except the unsupported network sources compile cleanlybde1995-08-161-3/+1
| | | | with -Wnested-externs.
* Eliminate sloppy common-style declarations. There should be none left forbde1995-07-291-4/+8
| | | | the LINT configuation.
* 1) Merged swpager structure into vm_object.dg1995-07-161-8/+13
| | | | | | 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.
* NOTE: libkvm, w, ps, 'top', and any other utility which depends on structdg1995-07-131-569/+177
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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).
* Merge RELENG_2_0_5 into HEADrgrimes1995-06-111-3/+3
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* Remove trailing whitespace.rgrimes1995-05-301-19/+19
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* Changes to fix the following bugs:dg1995-05-211-1/+2
| | | | | | | | | | | | | | | 1) Files weren't properly synced on filesystems other than UFS. In some cases, this lead to lost data. Most likely would be noticed on NFS. The fix is to make the VM page sync/object_clean general rather than in each filesystem. 2) Mixing regular and mmaped file I/O on NFS was very broken. It caused chunks of files to end up as zeroes rather than the intended contents. The fix was to fix several race conditions and to kludge up the "b_dirtyoff" and "b_dirtyend" that NFS relies upon - paying attention to page modifications that occurred via the mmapping. Reviewed by: David Greenman Submitted by: John Dyson
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