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* Provide separate accounting for user-wired pages.Mark Johnston2019-05-131-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Historically we have not distinguished between kernel wirings and user wirings for accounting purposes. User wirings (via mlock(2)) were subject to a global limit on the number of wired pages, so if large swaths of physical memory were wired by the kernel, as happens with the ZFS ARC among other things, the limit could be exceeded, causing user wirings to fail. The change adds a new counter, v_user_wire_count, which counts the number of virtual pages wired by user processes via mlock(2) and mlockall(2). Only user-wired pages are subject to the system-wide limit which helps provide some safety against deadlocks. In particular, while sources of kernel wirings typically support some backpressure mechanism, there is no way to reclaim user-wired pages shorting of killing the wiring process. The limit is exported as vm.max_user_wired, renamed from vm.max_wired, and changed from u_int to u_long. The choice to count virtual user-wired pages rather than physical pages was done for simplicity. There are mechanisms that can cause user-wired mappings to be destroyed while maintaining a wiring of the backing physical page; these make it difficult to accurately track user wirings at the physical page layer. The change also closes some holes which allowed user wirings to succeed even when they would cause the system limit to be exceeded. For instance, mmap() may now fail with ENOMEM in a process that has called mlockall(MCL_FUTURE) if the new mapping would cause the user wiring limit to be exceeded. Note that bhyve -S is subject to the user wiring limit, which defaults to 1/3 of physical RAM. Users that wish to exceed the limit must tune vm.max_user_wired. Reviewed by: kib, ngie (mlock() test changes) Tested by: pho (earlier version) MFC after: 45 days Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D19908 Notes: svn path=/head/; revision=347532
* Add more NUMA-specific low memory predicates.Mark Johnston2018-09-241-3/+25
| | | | | | | | | | | | | Use these predicates instead of inline references to vm_min_domains. Also add a global all_domains set, akin to all_cpus. Reviewed by: alc, jeff, kib Approved by: re (gjb) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D17278 Notes: svn path=/head/; revision=338919
* Avoid resource deadlocks when one domain has exhausted its memory. AttemptMark Johnston2018-09-061-0/+7
| | | | | | | | | | | | | | | other allowed domains if the requested domain is below the minimum paging threshold. Block in fork only if all domains available to the forking thread are below the severe threshold rather than any. Submitted by: jeff Reported by: mjg Reviewed by: alc, kib, markj Approved by: re (rgrimes) Differential Revision: https://reviews.freebsd.org/D16191 Notes: svn path=/head/; revision=338507
* vm: move vm_cnt to __read_mostly now that it is not written toMateusz Guzik2018-04-271-3/+0
| | | | | | | | | While here whack unused locking keys for the struct. Discussed with: jeff Notes: svn path=/head/; revision=333051
* Make v_wire_count a per-cpu counter(9) counter. This eliminates aJeff Roberson2018-02-121-1/+21
| | | | | | | | | | | | | | | significant source of cache line contention from vm_page_alloc(). Use accessors and vm_page_unwire_noq() so that the mechanism can be easily changed in the future. Reviewed by: markj Discussed with: kib, glebius Tested by: pho (earlier version) Sponsored by: Netflix, Dell/EMC Isilon Differential Revision: https://reviews.freebsd.org/D14273 Notes: svn path=/head/; revision=329187
* Use per-domain locks for vm page queue free. Move paging control fromJeff Roberson2018-02-061-50/+8
| | | | | | | | | | | | | | global to per-domain state. Protect reservations with the free lock from the domain that they belong to. Refactor to make vm domains more of a first class object. Reviewed by: markj, kib, gallatin Tested by: pho Sponsored by: Netflix, Dell/EMC Isilon Differential Revision: https://reviews.freebsd.org/D14000 Notes: svn path=/head/; revision=328954
* Update various statements in vmstat(8) to match reality.John Baldwin2018-01-181-5/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - The process stats are actually thread counts rather than process counts. - Simplify various descriptions to remove mention of stats that are updated every 5 seconds (all VM related stats are now "instant", only the load average is updated every 5 seconds). - Don't make any mention of special treatment for processes that have been active in the last 20 seconds. We don't track that stat. - Rework the description of active virtual memory. Call it mapped virtual memory and explicitly point out it is not the same as the active page queue (which corresponds to "Active" in top(1)), and also hint at the possible bogusness of the value (e.g. if a process maps a single page out of a multiple GB file, the entire file's size is considered mapped). - Simplify a few descriptions that implied their output was a value per interval. All of the "rate" values are per-second rates scaled across the interval. - Update a few comments for 'struct vmtotal' along similar lines. Reported by: mwlucas (indirectly) Reviewed by: kib MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D13905 Notes: svn path=/head/; revision=328134
* sys: further adoption of SPDX licensing ID tags.Pedro F. Giffuni2017-11-201-0/+2
| | | | | | | | | | | | | | | | | Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point. Notes: svn path=/head/; revision=326023
* vmtotal: extend memory counters to accomodate for current and futureKonstantin Belousov2017-11-151-14/+17
| | | | | | | | | | | | | | | | | | | | | hardware sizes. 32bit counters already overflow on approachable virtual memory page counts, and soon would overflow on the physical pages counts as well. Bump sizes to 64bit types. Bump __FreeBSD_version. It is impossible to provide perfect backward ABI compat for this change. If a program requests an old structure, it can be detected by size. But if it queries the size first by passing NULL old req pointer, there is almost nothing we can do to detect the desired ABI. As a partial solution, check p_osrel of the quering process when selecting the size to report. Submitted by: Pawel Biernacki <pawel.biernacki@gmail.com> Differential revision: https://reviews.freebsd.org/D13018 Notes: svn path=/head/; revision=325852
* Fix wrong v_free_count annotation - (f) instead of (a)Mateusz Guzik2017-10-141-1/+1
| | | | | | | Reported by: alc Notes: svn path=/head/; revision=324614
* Reduce traffic on vm_cnt.v_free_countMateusz Guzik2017-10-131-3/+3
| | | | | | | | | | | | | | | | | | The variable is modified with the highly contended page free queue lock. It unnecessarily shares a cacheline with purely read-only fields and is re-read after the lock is dropped in the page allocation code making the hold time longer. Pad the variable just like the others and store the value as found with the lock held instead of re-reading. Provides a modest 1%-ish speed up in concurrent page faults. Reviewed by: kib, markj Differential Revision: https://reviews.freebsd.org/D12665 Notes: svn path=/head/; revision=324610
* Move vmmeter atomic counters into dedicated cache linesMateusz Guzik2017-09-101-4/+11
| | | | | | | | | | | Prior to the change they were subject to extreme false sharing. In particular this change shaves about 3 seconds real time of -j 80 buildkernel. Reviewed by: alc, markj Differential Revision: https://reviews.freebsd.org/D12281 Notes: svn path=/head/; revision=323393
* - Remove 'struct vmmeter' from 'struct pcpu', leaving only global vmmeterGleb Smirnoff2017-04-171-71/+71
| | | | | | | | | | | | | | | | | | | | | | | | | | | | in place. To do per-cpu stats, convert all fields that previously were maintained in the vmmeters that sit in pcpus to counter(9). - Since some vmmeter stats may be touched at very early stages of boot, before we have set up UMA and we can do counter_u64_alloc(), provide an early counter mechanism: o Leave one spare uint64_t in struct pcpu, named pc_early_dummy_counter. o Point counter(9) fields of vmmeter to pcpu[0].pc_early_dummy_counter, so that at early stages of boot, before counters are allocated we already point to a counter that can be safely written to. o For sparc64 that required a whole dummy pcpu[MAXCPU] array. Further related changes: - Don't include vmmeter.h into pcpu.h. - vm.stats.vm.v_swappgsout and vm.stats.vm.v_swappgsin changed to 64-bit, to match kernel representation. - struct vmmeter hidden under _KERNEL, and only vmstat(1) is an exclusion. This is based on benno@'s 4-year old patch: https://lists.freebsd.org/pipermail/freebsd-arch/2013-July/014471.html Reviewed by: kib, gallatin, marius, lidl Differential Revision: https://reviews.freebsd.org/D10156 Notes: svn path=/head/; revision=317061
* Renumber copyright clause 4Warner Losh2017-02-281-1/+1
| | | | | | | | | | | | Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96 Notes: svn path=/head/; revision=314436
* Remove PG_CACHED-related fields from struct vmmeter, because they are noAlan Cox2016-11-221-11/+5
| | | | | | | | | | | | | | longer used. More precisely, they are always zero because the code that decremented and incremented them no longer exists. Bump __FreeBSD_version to mark this change. Reviewed by: kib, markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D8583 Notes: svn path=/head/; revision=309017
* Introduce a new page queue, PQ_LAUNDRY, for storing unreferenced, dirtyAlan Cox2016-11-091-2/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | pages, specificially, dirty pages that have passed once through the inactive queue. A new, dedicated thread is responsible for both deciding when to launder pages and actually laundering them. The new policy uses the relative sizes of the inactive and laundry queues to determine whether to launder pages at a given point in time. In general, this leads to more intelligent swapping behavior, since the laundry thread will avoid pageouts when the marginal benefit of doing so is low. Previously, without a dedicated queue for dirty pages, the page daemon didn't have the information to determine whether pageout provides any benefit to the system. Thus, the previous policy often resulted in small but steadily increasing amounts of swap usage when the system is under memory pressure, even when the inactive queue consisted mostly of clean pages. This change addresses that issue, and also paves the way for some future virtual memory system improvements by removing the last source of object-cached clean pages, i.e., PG_CACHE pages. The new laundry thread sleeps while waiting for a request from the page daemon thread(s). A request is raised by setting the variable vm_laundry_request and waking the laundry thread. We request launderings for two reasons: to try and balance the inactive and laundry queue sizes ("background laundering"), and to quickly make up for a shortage of free pages and clean inactive pages ("shortfall laundering"). When background laundering is requested, the laundry thread computes the number of page daemon wakeups that have taken place since the last laundering. If this number is large enough relative to the ratio of the laundry and (global) inactive queue sizes, we will launder vm_background_launder_target pages at vm_background_launder_rate KB/s. Otherwise, the laundry thread goes back to sleep without doing any work. When scanning the laundry queue during background laundering, reactivated pages are counted towards the laundry thread's target. In contrast, shortfall laundering is requested when an inactive queue scan fails to meet its target. In this case, the laundry thread attempts to launder enough pages to meet v_free_target within 0.5s, which is the inactive queue scan period. A laundry request can be latched while another is currently being serviced. In particular, a shortfall request will immediately preempt a background laundering. This change also redefines the meaning of vm_cnt.v_reactivated and removes the functions vm_page_cache() and vm_page_try_to_cache(). The new meaning of vm_cnt.v_reactivated now better reflects its name. It represents the number of inactive or laundry pages that are returned to the active queue on account of a reference. In collaboration with: markj Reviewed by: kib Tested by: pho Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D8302 Notes: svn path=/head/; revision=308474
* Make vm_pageout_wakeup_thresh a u_int rather than an int.Mark Johnston2016-07-201-2/+2
| | | | | | | | | | | It's a threshold for v_free_count, which is of type u_int. This also lets us get rid of a cast in vm_paging_needed(). Reviewed by: alc MFC after: 1 week Notes: svn path=/head/; revision=303052
* The flag "vm_pages_needed" has long served two distinct purposes: (1) toAlan Cox2016-05-271-1/+1
| | | | | | | | | | | | | | | | | | | indicate that threads are waiting for free pages to become available and (2) to indicate whether a wakeup call has been sent to the page daemon. The trouble is that a single flag cannot really serve both purposes, because we have two distinct targets for when to wakeup threads waiting for free pages versus when the page daemon has completed its work. In particular, the flag will be cleared by vm_page_free() before the page daemon has met its target, and this can lead to the OOM killer being invoked prematurely. To address this problem, a new flag "vm_pageout_wanted" is introduced. Discussed with: jeff Reviewed by: kib, markj Tested by: markj Sponsored by: EMC / Isilon Storage Division Notes: svn path=/head/; revision=300865
* Fix the style of the paging target predicates.Mark Johnston2016-05-201-24/+19
| | | | | | | | Discussed with: alc, kib MFC after: 1 week Notes: svn path=/head/; revision=300261
* sys/vmmeter.h: Fix trivial '-Wsign-compare' warning in common headerConrad Meyer2016-05-191-1/+1
| | | | | | | | | | | | | | Frankly, it doesn't make sense for vm_pageout_wakeup_thresh to have a negative value (it is only ever set to a fraction of v_free_min, which is unsigned and also obviously non-negative). But I'm not going to try and convert every non-negative scalar in the VM to unsigned today, so just cast it for the comparison. Submitted by: Clang 3.3 Sponsored by: EMC / Isilon Storage Division Notes: svn path=/head/; revision=300220
* sys/vmmeter.h: "desperate" spelling fix.Pedro F. Giffuni2016-05-191-1/+1
| | | | Notes: svn path=/head/; revision=300213
* Remove the v_cache_min and v_cache_max sysctls. They are unused and haveMark Johnston2015-09-111-2/+1
| | | | | | | | | | no effect. Reviewed by: alc Sponsored by: EMC / Isilon Storage Division Notes: svn path=/head/; revision=287640
* Rename global cnt to vm_cnt to avoid shadowing.Bryan Drewery2014-03-221-6/+10
| | | | | | | | | | | | | | | | | To reduce the diff struct pcu.cnt field was not renamed, so PCPU_OP(cnt.field) is still used. pc_cnt and pcpu are also used in kvm(3) and vmstat(8). The goal was to not affect externally used KPI. Bump __FreeBSD_version_ in case some out-of-tree module/code relies on the the global cnt variable. Exp-run revealed no ports using it directly. No objection from: arch@ Sponsored by: EMC / Isilon Storage Division Notes: svn path=/head/; revision=263620
* Improve pageout flow control to wakeup more frequently and do less work whileJeff Roberson2013-08-131-9/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | maintaining better LRU of active pages. - Change v_free_target to include the quantity previously represented by v_cache_min so we don't need to add them together everywhere we use them. - Add a pageout_wakeup_thresh that sets the free page count trigger for waking the page daemon. Set this 10% above v_free_min so we wakeup before any phase transitions in vm users. - Adjust down v_free_target now that we're willing to accept more pagedaemon wakeups. This means we process fewer pages in one iteration as well, leading to shorter lock hold times and less overall disruption. - Eliminate vm_pageout_page_stats(). This was a minor variation on the PQ_ACTIVE segment of the normal pageout daemon. Instead we now process 1 / vm_pageout_update_period pages every second. This causes us to visit the whole active list every 60 seconds. Previously we would only maintain the active LRU when we were short on pages which would mean it could be woefully out of date. Reviewed by: alc (slight variant of this) Discussed with: alc, kib, jhb Sponsored by: EMC / Isilon Storage Division Notes: svn path=/head/; revision=254304
* - Add system wide page faults requiring I/O counter.Andrey Zonov2013-01-281-0/+1
| | | | | | | | Reviewed by: alc MFC after: 2 weeks Notes: svn path=/head/; revision=246032
* Replace the single, global page queues lock with per-queue locks on theAlan Cox2012-11-131-2/+2
| | | | | | | | | active and inactive paging queues. Reviewed by: kib Notes: svn path=/head/; revision=242941
* Drop page queues mutex on each iteration of vm_pageout_scan over theKonstantin Belousov2012-07-071-1/+1
| | | | | | | | | | | | | | | | inactive queue, unless busy page is found. Dropping the mutex often should allow the other lock acquires to proceed without waiting for whole inactive scan to finish. On machines with lot of physical memory scan often need to iterate a lot before it finishes or finds a page which requires laundring, causing high latency for other lock waiters. Suggested and reviewed by: alc MFC after: 3 weeks Notes: svn path=/head/; revision=238212
* Move repeated MAXSLP definition from machine/vmparam.h to sys/vmmeter.h.Konstantin Belousov2011-01-091-0/+6
| | | | | | | | | | Update the outdated comments describing MAXSLP and the process selection algorithm for swap out. Comments wording and reviewed by: alc Notes: svn path=/head/; revision=217192
* Push down the page queues into vm_page_cache(), vm_page_try_to_cache(), andAlan Cox2010-05-081-1/+1
| | | | | | | | | | | | | | vm_page_try_to_free(). Consequently, push down the page queues lock into pmap_enter_quick(), pmap_page_wired_mapped(), pmap_remove_all(), and pmap_remove_write(). Push down the page queues lock into Xen's pmap_page_is_mapped(). (I overlooked the Xen pmap in r207702.) Switch to a per-processor counter for the total number of pages cached. Notes: svn path=/head/; revision=207796
* Eliminate acquisitions of the page queues lock that are no longer needed.Alan Cox2010-05-071-1/+1
| | | | | | | | Switch to a per-processor counter for the number of pages freed during process termination. Notes: svn path=/head/; revision=207739
* Correct the description of v_cache_count. Eliminate an unused function.Alan Cox2008-07-191-12/+1
| | | | Notes: svn path=/head/; revision=180622
* Change the management of cached pages (PQ_CACHE) in two fundamentalAlan Cox2007-09-251-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ways: (1) Cached pages are no longer kept in the object's resident page splay tree and memq. Instead, they are kept in a separate per-object splay tree of cached pages. However, access to this new per-object splay tree is synchronized by the _free_ page queues lock, not to be confused with the heavily contended page queues lock. Consequently, a cached page can be reclaimed by vm_page_alloc(9) without acquiring the object's lock or the page queues lock. This solves a problem independently reported by tegge@ and Isilon. Specifically, they observed the page daemon consuming a great deal of CPU time because of pages bouncing back and forth between the cache queue (PQ_CACHE) and the inactive queue (PQ_INACTIVE). The source of this problem turned out to be a deadlock avoidance strategy employed when selecting a cached page to reclaim in vm_page_select_cache(). However, the root cause was really that reclaiming a cached page required the acquisition of an object lock while the page queues lock was already held. Thus, this change addresses the problem at its root, by eliminating the need to acquire the object's lock. Moreover, keeping cached pages in the object's primary splay tree and memq was, in effect, optimizing for the uncommon case. Cached pages are reclaimed far, far more often than they are reactivated. Instead, this change makes reclamation cheaper, especially in terms of synchronization overhead, and reactivation more expensive, because reactivated pages will have to be reentered into the object's primary splay tree and memq. (2) Cached pages are now stored alongside free pages in the physical memory allocator's buddy queues, increasing the likelihood that large allocations of contiguous physical memory (i.e., superpages) will succeed. Finally, as a result of this change long-standing restrictions on when and where a cached page can be reclaimed and returned by vm_page_alloc(9) are eliminated. Specifically, calls to vm_page_alloc(9) specifying VM_ALLOC_INTERRUPT can now reclaim and return a formerly cached page. Consequently, a call to malloc(9) specifying M_NOWAIT is less likely to fail. Discussed with: many over the course of the summer, including jeff@, Justin Husted @ Isilon, peter@, tegge@ Tested by: an earlier version by kris@ Approved by: re (kensmith) Notes: svn path=/head/; revision=172317
* Add a counter for the total number of pages cached and support forAlan Cox2007-07-271-0/+1
| | | | | | | | | reporting the value of this counter in the program "vmstat". Approved by: re (rwatson) Notes: svn path=/head/; revision=171633
* Optimize vmmeter locking.Attilio Rao2007-06-101-50/+56
| | | | | | | | | | | | | In particular: - Add an explicative table for locking of struct vmmeter members - Apply new rules for some of those members - Remove some unuseful comments Heavily reviewed by: alc, bde, jeff Approved by: jeff (mentor) Notes: svn path=/head/; revision=170517
* Revert VMCNT_* operations introduction.Attilio Rao2007-05-311-24/+9
| | | | | | | | | | | Probabilly, a general approach is not the better solution here, so we should solve the sched_lock protection problems separately. Requested by: alc Approved by: jeff (mentor) Notes: svn path=/head/; revision=170170
* - rename VMCNT_DEC to VMCNT_SUB to reflect the count argument.Jeff Roberson2007-05-201-1/+1
| | | | | | | | Suggested by: julian@ Contributed by: attilio@ Notes: svn path=/head/; revision=169805
* - define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulatingJeff Roberson2007-05-181-9/+24
| | | | | | | | | | | vmcnts. This can be used to abstract away pcpu details but also changes to use atomics for all counters now. This means sched lock is no longer responsible for protecting counts in the switch routines. Contributed by: Attilio Rao <attilio@FreeBSD.org> Notes: svn path=/head/; revision=169667
* - Revert signedness type changes to "struct vmtotal"; by makingRuslan Ermilov2006-11-281-14/+14
| | | | | | | | | | | | | | | | | them unsigned I made the possible overflows hard to detect, and it only saved 1 bit which isn't principal, even less now that the underlying issue with the total of virtual memory has been fixed. (For the record, it will overflow with >=2T of VM total, with 32-bit ints used to keep counters in pages.) - While here, fix printing of other "struct vmtotal" members such as t_rq, t_dw, t_pw, and t_sw as they are also signed. Reviewed by: bde MFC after: 3 days Notes: svn path=/head/; revision=164718
* - Fix types of "struct vmmeter" members so they are unsigned.Ruslan Ermilov2006-11-201-14/+14
| | | | | | | | | | - Fix overflow bugs in sysctl(8), systat(1), and vmstat(8) when printing values of "struct vmmeter" in kilobytes as they don't necessarily fit into 32 bits. (Fix sysctl(8) reporting of a total virtual memory; it's in pages too.) Notes: svn path=/head/; revision=164443
* Remove remnants of PGINPROF.Tim J. Robbins2004-06-081-38/+0
| | | | Notes: svn path=/head/; revision=130239
* Remove advertising clause from University of California Regent's license,Warner Losh2004-04-071-4/+0
| | | | | | | | | per letter dated July 22, 1999. Approved by: core Notes: svn path=/head/; revision=127976
* - It's more accurate to say that vm_paging_needed() returns TRUEAlan Cox2003-02-021-1/+1
| | | | | | | | | than a positive number. - In pagedaemon_wakeup(), set vm_pages_needed to 1 rather than incrementing it to accomplish the same. Notes: svn path=/head/; revision=110225
* Make a structure definition slightly more style(9) compliant (makesBrian S. Dean2002-06-011-2/+1
| | | | | | | the structure definition easier to find using grep). Notes: svn path=/head/; revision=97691
* Add mibs to hold the number of forks since boot. New mibs are:Hajimu UMEMOTO2001-01-231-0/+11
| | | | | | | | | | | | | | | | | vm.stats.vm.v_forks vm.stats.vm.v_vforks vm.stats.vm.v_rforks vm.stats.vm.v_kthreads vm.stats.vm.v_forkpages vm.stats.vm.v_vforkpages vm.stats.vm.v_rforkpages vm.stats.vm.v_kthreadpages Submitted by: Paul Herman <pherman@frenchfries.net> Reviewed by: alfred Notes: svn path=/head/; revision=71429
* Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL"Peter Wemm1999-12-291-1/+1
| | | | | | | | | is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come. Notes: svn path=/head/; revision=55205
* Reviewed by: Alan Cox <alc@cs.rice.edu>, David Greenman <dg@root.com>Matthew Dillon1999-09-171-0/+86
| | | | | | | | | | | | | | | | | | | Replace various VM related page count calculations strewn over the VM code with inlines to aid in readability and to reduce fragility in the code where modules depend on the same test being performed to properly sleep and wakeup. Split out a portion of the page deactivation code into an inline in vm_page.c to support vm_page_dontneed(). add vm_page_dontneed(), which handles the madvise MADV_DONTNEED feature in a related commit coming up for vm_map.c/vm_object.c. This code prevents degenerate cases where an essentially active page may be rotated through a subset of the paging lists, resulting in premature disposal. Notes: svn path=/head/; revision=51337
* $Id$ -> $FreeBSD$Peter Wemm1999-08-281-1/+1
| | | | Notes: svn path=/head/; revision=50477
* Reviewed by: Matthew Dillon <dillon@apollo.backplane.com>Alan Cox1999-02-251-2/+2
| | | | | | | Revert the comment for v_ozfod now that vm_fault is fixed. Notes: svn path=/head/; revision=44251
* Adjust idle zero-page fill hysteresis based on tests. Use 2/3 and 4/5Matthew Dillon1999-02-081-2/+2
| | | | | | | | | | zero-fill levels. Adjust comment for ozfod in vmmeter.h - this counter represents non-optimal ( on the fly ) zero fills, not prefills. Notes: svn path=/head/; revision=43758
* Make vm_fault much cleaner by removing the evil macro inlines, andJohn Dyson1998-03-071-1/+3
| | | | | | | | | | | | | put alot of it's context into a data structure. This allows significant shortening of its codepath, and will significantly decrease it's cache footprint. Also, add some stats to vmmeter. Note that you'll have to rebuild/recompile vmstat, systat, etc... Otherwise, you'll get "very interesting" paging stats. Notes: svn path=/head/; revision=34202
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