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* vm: Remove kernel stack swapping support, part 2Mark Johnston2024-07-291-1/+0
| | | | | | | | | | | | | After mi_startup() finishes, thread0 becomes the "swapper", whose responsibility is to swap threads back in on demand. Now that threads can't be swapped out, there is no use for this thread. Just sleep forever once sysinits are finished; thread_exit() doesn't work because thread0 is allocated statically. The thread could be repurposed if that would be useful. Tested by: pho Reviewed by: alc, imp, kib Differential Revision: https://reviews.freebsd.org/D46113
* pmap: Skip some superpage promotion attempts that will failAlan Cox2024-06-041-0/+1
| | | | | | | | | | | | | Implement a simple heuristic to skip pointless promotion attempts by pmap_enter_quick_locked() and moea64_enter(). Specifically, when vm_fault() calls pmap_enter_quick() to map neighboring pages at the end of a copy-on-write fault, there is no point in attempting promotion in pmap_enter_quick_locked() and moea64_enter(). Promotion will fail because the base pages have differing protection. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D45431 MFC after: 1 week
* vm: add macro to mark arguments used when NUMA is definedStephen J. Kiernan2024-04-091-0/+6
| | | | | | | | | This fixes compiler warnings when -Wunused-arguments is enabled and not quieted. Reviewed by: kib, markj Obtained from: Juniper Networks, Inc. Differential Revision: https://reviews.freebsd.org/D44623
* sys: Remove ancient SCCS tags.Warner Losh2023-11-271-4/+0
| | | | | | | | Remove ancient SCCS tags from the tree, automated scripting, with two minor fixup to keep things compiling. All the common forms in the tree were removed with a perl script. Sponsored by: Netflix
* sys: Remove $FreeBSD$: two-line .h patternWarner Losh2023-08-161-2/+0
| | | | Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/
* vm/vm.h: cleanupKonstantin Belousov2022-09-171-12/+11
| | | | | | | | | | Move declarations for in-kernel function and variables to _KERNEL section. Reviewed by: markj Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D36612
* vm: make vm.overcommit available externallyKonstantin Belousov2022-09-161-0/+6
| | | | | | | | Reviewed by: brooks, imp (previous version) Discussed with: markj Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D36540
* vm_pager: Remove the default pagerMark Johnston2022-07-171-1/+2
| | | | | | | | | | It's unused now. Keep the OBJ_DEFAULT identifier, but make it an alias of OBJT_SWAP for the benefit of out-of-tree code. Reviewed by: alc, imp, kib Tested by: pho Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D35790
* vm: Fix a common typo in a source code commentGordon Bergling2022-06-051-1/+1
| | | | | | - s/independant/independent/ MFC after: 3 days
* tmpfs: dynamically register tmpfs pagerKonstantin Belousov2021-05-131-1/+0
| | | | | | | | | | | | | | | | Remove OBJT_SWAP_TMPFS. Move tmpfs-specific swap pager bits into tmpfs_subr.c. There is no longer any code to directly support tmpfs in sys/vm, most tmpfs knowledge is shared by non-anon swap object type implementation. The tmpfs-specific methods are provided by registered tmpfs pager, which inherits from the swap pager. Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D30168
* vm: Add KPI to dynamically register pagersKonstantin Belousov2021-05-131-0/+1
| | | | | | | | | | | Pager is allowed to inherit part of its implementation from the existing pager, which is done by copying non-NULL virtual method slots. Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D30168
* Add OBJT_SWAP_TMPFS pagerKonstantin Belousov2021-05-071-0/+1
| | | | | | | | | | | | | | | | | | | | This is OBJT_SWAP pager, specialized for tmpfs. Right now, both swap pager and generic vm code have to explicitly handle swap objects which are tmpfs vnode v_object, in the special ways. Replace (almost) all such places with proper methods. Since VM still needs a notion of the 'swap object', regardless of its use, add yet another type-classification flag OBJ_SWAP. Set it in vm_object_allocate() where other type-class flags are set. This change almost completely eliminates the knowledge of tmpfs from VM, and opens a way to make OBJT_SWAP_TMPFS loadable from tmpfs.ko. Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D30070
* Style enum obj_typeKonstantin Belousov2021-05-071-2/+10
| | | | | | | | | | | Put each type into dedicated line, which makes addition of new types cleaner. Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D30070
* Add a VA_IS_CLEANMAP() macro.John Baldwin2021-02-181-0/+3
| | | | | | | | | | | | | | This macro returns true if a provided virtual address is contained in the kernel's clean submap. In CHERI kernels, the buffer cache and transient I/O map are allocated as separate regions. Abstracting this check reduces the diff relative to FreeBSD. It is perhaps slightly more readable as well. Reviewed by: kib Obtained from: CheriBSD Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D28710
* vm: clean up empty lines in .c and .h filesMateusz Guzik2020-09-011-1/+0
| | | | Notes: svn path=/head/; revision=365074
* Merge OpenZFS support in to HEAD.Matt Macy2020-08-251-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The primary benefit is maintaining a completely shared code base with the community allowing FreeBSD to receive new features sooner and with less effort. I would advise against doing 'zpool upgrade' or creating indispensable pools using new features until this change has had a month+ to soak. Work on merging FreeBSD support in to what was at the time "ZFS on Linux" began in August 2018. I first publicly proposed transitioning FreeBSD to (new) OpenZFS on December 18th, 2018. FreeBSD support in OpenZFS was finally completed in December 2019. A CFT for downstreaming OpenZFS support in to FreeBSD was first issued on July 8th. All issues that were reported have been addressed or, for a couple of less critical matters there are pull requests in progress with OpenZFS. iXsystems has tested and dogfooded extensively internally. The TrueNAS 12 release is based on OpenZFS with some additional features that have not yet made it upstream. Improvements include: project quotas, encrypted datasets, allocation classes, vectorized raidz, vectorized checksums, various command line improvements, zstd compression. Thanks to those who have helped along the way: Ryan Moeller, Allan Jude, Zack Welch, and many others. Sponsored by: iXsystems, Inc. Differential Revision: https://reviews.freebsd.org/D25872 Notes: svn path=/head/; revision=364746
* vm: fix swap reservation leak and clean up surrounding codeMateusz Guzik2020-07-241-2/+4
| | | | | | | | | | | | | | | | | | The code did not subtract from the global counter if per-uid reservation failed. Cleanup highlights: - load overcommit once - move per-uid manipulation to dedicated routines - don't fetch wire count if requested size is below the limit - convert return type from int to bool - ifdef the routines with _KERNEL to keep vm.h compilable by userspace Reviewed by: kib (previous version) Differential Revision: https://reviews.freebsd.org/D25787 Notes: svn path=/head/; revision=363472
* Move vm_ndomains to vm.h where it can be used with a single header includeJeff Roberson2018-03-271-0/+2
| | | | | | | | | | rather than requiring a half-dozen. Many non-vm files may want to know the number of valid domains. Sponsored by: Netflix, Dell/EMC Isilon Notes: svn path=/head/; revision=331605
* Allow to specify for vm_fault_quick_hold_pages() that nofault modeKonstantin Belousov2018-03-261-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | should be honored. We must not sleep or acquire any MI VM locks if TDP_NOFAULTING is specified. On the other hand, there were some callers in the tree which set TDP_NOFAULTING for larger scope than needed, I fixed the code which I wrote, but I suspect that linuxkpi and out of tree drm drivers might abuse this still. So only enable the mode for vm_fault_quick_hold_pages() where vm_fault_hold() is not called when specifically asked by user. I decided to use vm_prot_t flag to not change KPI. Since number of flags in vm_prot_t is limited, I reused the same flag which was already consumed for vm_map_lookup(). Reported and tested by: pho (as part of the larger patch) Reviewed by: markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D14825 Notes: svn path=/head/; revision=331557
* SPDX: Consider code from Carnegie-Mellon University.Pedro F. Giffuni2017-11-301-1/+1
| | | | | | | Interesting cases, most likely from CMU Mach sources. Notes: svn path=/head/; revision=326403
* 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
* Implement address space guards.Konstantin Belousov2017-06-241-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Guard, requested by the MAP_GUARD mmap(2) flag, prevents the reuse of the allocated address space, but does not allow instantiation of the pages in the range. It is useful for more explicit support for usual two-stage reserve then commit allocators, since it prevents accidental instantiation of the mapping, e.g. by mprotect(2). Use guards to reimplement stack grow code. Explicitely track stack grow area with the guard, including the stack guard page. On stack grow, trivial shift of the guard map entry and stack map entry limits makes the stack expansion. Move the code to detect stack grow and call vm_map_growstack(), from vm_fault() into vm_map_lookup(). As result, it is impossible to get random mapping to occur in the stack grow area, or to overlap the stack guard page. Enable stack guard page by default. Reviewed by: alc, markj Man page update reviewed by: alc, bjk, emaste, markj, pho Tested by: pho, Qualys Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D11306 (man pages) Notes: svn path=/head/; revision=320317
* Implement INHERIT_ZERO for minherit(2).Xin LI2017-03-141-0/+1
| | | | | | | | | | | | | | | | | INHERIT_ZERO is an OpenBSD feature. When a page is marked as such, it would be zeroed upon fork(). This would be used in new arc4random(3) functions. PR: 182610 Reviewed by: kib (earlier version) MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D427 Notes: svn path=/head/; revision=315272
* 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
* Add new bus methods for mapping resources.John Baldwin2016-05-201-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a pair of bus methods that can be used to "map" resources for direct CPU access using bus_space(9). bus_map_resource() creates a mapping and bus_unmap_resource() releases a previously created mapping. Mappings are described by 'struct resource_map' object. Pointers to these objects can be passed as the first argument to the bus_space wrapper API used for bus resources. Drivers that wish to map all of a resource using default settings (for example, using uncacheable memory attributes) do not need to change. However, drivers that wish to use non-default settings can now do so without jumping through hoops. First, an RF_UNMAPPED flag is added to request that a resource is not implicitly mapped with the default settings when it is activated. This permits other activation steps (such as enabling I/O or memory decoding in a device's PCI command register) to be taken without creating a mapping. Right now the AGP drivers don't set RF_ACTIVE to avoid using up a large amount of KVA to map the AGP aperture on 32-bit platforms. Once RF_UNMAPPED is supported on all platforms that support AGP this can be changed to using RF_UNMAPPED with RF_ACTIVE instead. Second, bus_map_resource accepts an optional structure that defines additional settings for a given mapping. For example, a driver can now request to map only a subset of a resource instead of the entire range. The AGP driver could also use this to only map the first page of the aperture (IIRC, it calls pmap_mapdev() directly to map the first page currently). I will also eventually change the PCI-PCI bridge driver to request mappings of the subset of the I/O window resource on its parent side to create mappings for child devices rather than passing child resources directly up to nexus to be mapped. This also permits bridges that do address translation to request suitable mappings from a resource on the "upper" side of the bus when mapping resources on the "lower" side of the bus. Another attribute that can be specified is an alternate memory attribute for memory-mapped resources. This can be used to request a Write-Combining mapping of a PCI BAR in an MI fashion. (Currently the drivers that do this call pmap_change_attr() directly for x86 only.) Note that this commit only adds the MI framework. Each platform needs to add support for handling RF_UNMAPPED and thew new bus_map/unmap_resource methods. Generally speaking, any drivers that are calling rman_set_bustag() and rman_set_bushandle() need to be updated. Discussed on: arch Reviewed by: cem Differential Revision: https://reviews.freebsd.org/D5237 Notes: svn path=/head/; revision=300317
* rename scheduler->swapper and SI_SUB_RUN_SCHEDULER->SI_SUB_LASTAndriy Gapon2013-07-241-0/+1
| | | | | | | | | | | | | | | | | | | Also directly call swapper() at the end of mi_startup instead of relying on swapper being the last thing in sysinits order. Rationale: - "RUN_SCHEDULER" was misleading, scheduling already takes place at that stage - "scheduler" was misleading, the function swaps in the swapped out processes - another SYSINIT(SI_SUB_RUN_SCHEDULER, SI_ORDER_ANY) could never be invoked depending on its relative order with scheduler; this was not obvious and the bug actually used to exist Reviewed by: kib (ealier version) MFC after: 14 days Notes: svn path=/head/; revision=253604
* - Add a general purpose resource allocator, vmem, from NetBSD. It wasJeff Roberson2013-06-281-4/+0
| | | | | | | | | | | | | | | | | originally inspired by the Solaris vmem detailed in the proceedings of usenix 2001. The NetBSD version was heavily refactored for bugs and simplicity. - Use this resource allocator to allocate the buffer and transient maps. Buffer cache defrags are reduced by 25% when used by filesystems with mixed block sizes. Ultimately this may permit dynamic buffer cache sizing on low KVA machines. Discussed with: alc, kib, attilio Tested by: pho Sponsored by: EMC / Isilon Storage Division Notes: svn path=/head/; revision=252330
* Implement the concept of the unmapped VMIO buffers, i.e. buffers whichKonstantin Belousov2013-03-191-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | do not map the b_pages pages into buffer_map KVA. The use of the unmapped buffers eliminate the need to perform TLB shootdown for mapping on the buffer creation and reuse, greatly reducing the amount of IPIs for shootdown on big-SMP machines and eliminating up to 25-30% of the system time on i/o intensive workloads. The unmapped buffer should be explicitely requested by the GB_UNMAPPED flag by the consumer. For unmapped buffer, no KVA reservation is performed at all. The consumer might request unmapped buffer which does have a KVA reserve, to manually map it without recursing into buffer cache and blocking, with the GB_KVAALLOC flag. When the mapped buffer is requested and unmapped buffer already exists, the cache performs an upgrade, possibly reusing the KVA reservation. Unmapped buffer is translated into unmapped bio in g_vfs_strategy(). Unmapped bio carry a pointer to the vm_page_t array, offset and length instead of the data pointer. The provider which processes the bio should explicitely specify a readiness to accept unmapped bio, otherwise g_down geom thread performs the transient upgrade of the bio request by mapping the pages into the new bio_transient_map KVA submap. The bio_transient_map submap claims up to 10% of the buffer map, and the total buffer_map + bio_transient_map KVA usage stays the same. Still, it could be manually tuned by kern.bio_transient_maxcnt tunable, in the units of the transient mappings. Eventually, the bio_transient_map could be removed after all geom classes and drivers can accept unmapped i/o requests. Unmapped support can be turned off by the vfs.unmapped_buf_allowed tunable, disabling which makes the buffer (or cluster) creation requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped buffers are only enabled by default on the architectures where pmap_copy_page() was implemented and tested. In the rework, filesystem metadata is not the subject to maxbufspace limit anymore. Since the metadata buffers are always mapped, the buffers still have to fit into the buffer map, which provides a reasonable (but practically unreachable) upper bound on it. The non-metadata buffer allocations, both mapped and unmapped, is accounted against maxbufspace, as before. Effectively, this means that the maxbufspace is forced on mapped and unmapped buffers separately. The pre-patch bufspace limiting code did not worked, because buffer_map fragmentation does not allow the limit to be reached. By Jeff Roberson request, the getnewbuf() function was split into smaller single-purpose functions. Sponsored by: The FreeBSD Foundation Discussed with: jeff (previous version) Tested by: pho, scottl (previous version), jhb, bf MFC after: 2 weeks Notes: svn path=/head/; revision=248508
* - Fix locked memory accounting for maps with MAP_WIREFUTURE flag.Andrey Zonov2012-12-181-0/+2
| | | | | | | | | | | - Add sysctl vm.old_mlock which may turn such accounting off. Reviewed by: avg, trasz Approved by: kib (mentor) MFC after: 1 week Notes: svn path=/head/; revision=244384
* Add new pager type, OBJT_MGTDEVICE. It provides the device pagerKonstantin Belousov2012-05-121-1/+1
| | | | | | | | | | | | | | | | | | | | which carries fictitous managed pages. In particular, the consumers of the new object type can remove all mappings of the device page with pmap_remove_all(). The range of physical addresses used for fake page allocation shall be registered with vm_phys_fictitious_reg_range() interface to allow the PHYS_TO_VM_PAGE() to work in pmap. Most likely, only i386 and amd64 pmaps can handle fictitious managed pages right now. Sponsored by: The FreeBSD Foundation Reviewed by: alc MFC after: 1 month Notes: svn path=/head/; revision=235375
* Replace pointer to "struct uidinfo" with pointer to "struct ucred"Edward Tomasz Napierala2010-12-021-3/+3
| | | | | | | | | | | | in "struct vm_object". This is required to make it possible to account for per-jail swap usage. Reviewed by: kib@ Tested by: pho@ Sponsored by: FreeBSD Foundation Notes: svn path=/head/; revision=216128
* Replace VM_PROT_OVERRIDE_WRITE by VM_PROT_COPY. VM_PROT_OVERRIDE_WRITE hasAlan Cox2009-11-261-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | represented a write access that is allowed to override write protection. Until now, VM_PROT_OVERRIDE_WRITE has been used to write breakpoints into text pages. Text pages are not just write protected but they are also copy-on-write. VM_PROT_OVERRIDE_WRITE overrides the write protection on the text page and triggers the replication of the page so that the breakpoint will be written to a private copy. However, here is where things become confused. It is the debugger, not the process being debugged that requires write access to the copied page. Nonetheless, the copied page is being mapped into the process with write access enabled. In other words, once the debugger sets a breakpoint within a text page, the program can write to its private copy of that text page. Whereas prior to setting the breakpoint, a SIGSEGV would have occurred upon a write access. VM_PROT_COPY addresses this problem. The combination of VM_PROT_READ and VM_PROT_COPY forces the replication of a copy-on-write page even though the access is only for read. Moreover, the replicated page is only mapped into the process with read access, and not write access. Reviewed by: kib MFC after: 4 weeks Notes: svn path=/head/; revision=199819
* Extend the device pager to support different memory attributes on differentJohn Baldwin2009-08-281-6/+6
| | | | | | | | | | | | | | | | | | pages in an object. - Add a new variant of d_mmap() currently called d_mmap2() which accepts an additional in/out parameter that is the memory attribute to use for the requested page. - A driver either uses d_mmap() or d_mmap2() for all requests but not both. The current implementation uses a flag in the cdevsw (D_MMAP2) to indicate that the driver provides a d_mmap2() handler instead of d_mmap(). This is done to make the change ABI compatible with existing drivers and MFC'able to 7 and 8. Submitted by: alc MFC after: 1 month Notes: svn path=/head/; revision=196615
* Add a new type of VM object: OBJT_SG. An OBJT_SG object is very similar toJohn Baldwin2009-07-241-1/+1
| | | | | | | | | | | | | | a device pager (OBJT_DEVICE) object in that it uses fictitious pages to provide aliases to other memory addresses. The primary difference is that it uses an sglist(9) to determine the physical addresses for a given offset into the object instead of invoking the d_mmap() method in a device driver. Reviewed by: alc Approved by: re (kensmith) MFC after: 2 weeks Notes: svn path=/head/; revision=195840
* Add support to the virtual memory system for configuring machine-Alan Cox2009-07-121-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | dependent memory attributes: Rename vm_cache_mode_t to vm_memattr_t. The new name reflects the fact that there are machine-dependent memory attributes that have nothing to do with controlling the cache's behavior. Introduce vm_object_set_memattr() for setting the default memory attributes that will be given to an object's pages. Introduce and use pmap_page_{get,set}_memattr() for getting and setting a page's machine-dependent memory attributes. Add full support for these functions on amd64 and i386 and stubs for them on the other architectures. The function pmap_page_set_memattr() is also responsible for any other machine-dependent aspects of changing a page's memory attributes, such as flushing the cache or updating the direct map. The uses include kmem_alloc_contig(), vm_page_alloc(), and the device pager: kmem_alloc_contig() can now be used to allocate kernel memory with non-default memory attributes on amd64 and i386. vm_page_alloc() and the device pager will set the memory attributes for the real or fictitious page according to the object's default memory attributes. Update the various pmap functions on amd64 and i386 that map pages to incorporate each page's memory attributes in the mapping. Notes: (1) Inherent to this design are safety features that prevent the specification of inconsistent memory attributes by different mappings on amd64 and i386. In addition, the device pager provides a warning when a device driver creates a fictitious page with memory attributes that are inconsistent with the real page that the fictitious page is an alias for. (2) Storing the machine-dependent memory attributes for amd64 and i386 as a dedicated "int" in "struct md_page" represents a compromise between space efficiency and the ease of MFCing these changes to RELENG_7. In collaboration with: jhb Approved by: re (kib) Notes: svn path=/head/; revision=195649
* This change is the next step in implementing the cache control functionalityAlan Cox2009-06-261-0/+8
| | | | | | | | | | | | | | required by video card drivers. Specifically, this change introduces vm_cache_mode_t with an appropriate VM_CACHE_DEFAULT definition on all architectures. In addition, this changes adds a vm_cache_mode_t parameter to kmem_alloc_contig() and vm_phys_alloc_contig(). These will be the interfaces for allocating mapped kernel memory and physical memory, respectively, with non-default cache modes. In collaboration with: jhb Notes: svn path=/head/; revision=195033
* Implement global and per-uid accounting of the anonymous memory. AddKonstantin Belousov2009-06-231-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | rlimit RLIMIT_SWAP that limits the amount of swap that may be reserved for the uid. The accounting information (charge) is associated with either map entry, or vm object backing the entry, assuming the object is the first one in the shadow chain and entry does not require COW. Charge is moved from entry to object on allocation of the object, e.g. during the mmap, assuming the object is allocated, or on the first page fault on the entry. It moves back to the entry on forks due to COW setup. The per-entry granularity of accounting makes the charge process fair for processes that change uid during lifetime, and decrements charge for proper uid when region is unmapped. The interface of vm_pager_allocate(9) is extended by adding struct ucred *, that is used to charge appropriate uid when allocation if performed by kernel, e.g. md(4). Several syscalls, among them is fork(2), may now return ENOMEM when global or per-uid limits are enforced. In collaboration with: pho Reviewed by: alc Approved by: re (kensmith) Notes: svn path=/head/; revision=194766
* Add the superpage reservation type.Alan Cox2007-12-271-0/+3
| | | | Notes: svn path=/head/; revision=174939
* Retire debug.mpsafevm. None of the architectures supported in CVS requireAlan Cox2006-07-211-13/+0
| | | | | | | it any longer. Notes: svn path=/head/; revision=160561
* - Change the vm_mmap() function to accept an objtype_t parameter specifyingJohn Baldwin2005-04-011-0/+4
| | | | | | | | | | | | | | | the type of object represented by the handle argument. - Allow vm_mmap() to map device memory via cdev objects in addition to vnodes and anonymous memory. Note that mmaping a cdev directly does not currently perform any MAC checks like mapping a vnode does. - Unbreak the DRM getbufs ioctl by having it call vm_mmap() directly on the cdev the ioctl is acting on rather than trying to find a suitable vnode to map from. Reviewed by: alc, arch@ Notes: svn path=/head/; revision=144501
* /* -> /*- for license, minor formatting changesWarner Losh2005-01-071-1/+1
| | | | Notes: svn path=/head/; revision=139825
* - Introduce and use a new tunable "debug.mpsafevm". At present, settingAlan Cox2004-08-161-0/+13
| | | | | | | | | | | | | | | | | "debug.mpsafevm" results in (almost) Giant-free execution of zero-fill page faults. (Giant is held only briefly, just long enough to determine if there is a vnode backing the faulting address.) Also, condition the acquisition and release of Giant around calls to pmap_remove() on "debug.mpsafevm". The effect on performance is significant. On my dual Opteron, I see a 3.6% reduction in "buildworld" time. - Use atomic operations to update several counters in vm_fault(). Notes: svn path=/head/; revision=133807
* Remove advertising clause from University of California Regent's license,Warner Losh2004-04-061-4/+0
| | | | | | | | | per letter dated July 22, 1999. Approved by: core Notes: svn path=/head/; revision=127961
* Change the way ELF coredumps are handled. Instead of unconditionallyMatthew Dillon2002-12-161-0/+1
| | | | | | | | | | | | | | | | | | | | | | skipping read-only pages, which can result in valuable non-text-related data not getting dumped, the ELF loader and the dynamic loader now mark read-only text pages NOCORE and the coredump code only checks (primarily) for complete inaccessibility of the page or NOCORE being set. Certain applications which map large amounts of read-only data will produce much larger cores. A new sysctl has been added, debug.elf_legacy_coredump, which will revert to the old behavior. This commit represents collaborative work by all parties involved. The PR contains a program demonstrating the problem. PR: kern/45994 Submitted by: "Peter Edwards" <pmedwards@eircom.net>, Archie Cobbs <archie@dellroad.org> Reviewed by: jdp, dillon MFC after: 7 days Notes: svn path=/head/; revision=107948
* - Remove a number of extra newlines that do not belong here according toEivind Eklund2002-03-101-1/+1
| | | | | | | | | | | | style(9) - Minor space adjustment in cases where we have "( ", " )", if(), return(), while(), for(), etc. - Add /* SYMBOL */ after a few #endifs. Reviewed by: alc Notes: svn path=/head/; revision=92029
* Remove a parameter name from a prototype.David Malone2002-01-251-1/+1
| | | | Notes: svn path=/head/; revision=89802
* Move most of the kernel submap initialization code, including theMatthew Dillon2001-08-221-0/+17
| | | | | | | | | | | timeout callwheel and buffer cache, out of the platform specific areas and into the machine independant area. i386 and alpha adjusted here. Other cpus can be fixed piecemeal. Reviewed by: freebsd-smp, jake Notes: svn path=/head/; revision=82127
* With Alfred's permission, remove vm_mtx in favor of a fine-grained approachMatthew Dillon2001-07-041-4/+0
| | | | | | | | | | | | (this commit is just the first stage). Also add various GIANT_ macros to formalize the removal of Giant, making it easy to test in a more piecemeal fashion. These macros will allow us to test fine-grained locks to a degree before removing Giant, and also after, and to remove Giant in a piecemeal fashion via sysctl's on those subsystems which the authors believe can operate without Giant. Notes: svn path=/head/; revision=79224
* Introduce a global lock for the vm subsystem (vm_mtx).Alfred Perlstein2001-05-191-0/+4
| | | | | | | | | | | | | | | | | | | | | | vm_mtx does not recurse and is required for most low level vm operations. faults can not be taken without holding Giant. Memory subsystems can now call the base page allocators safely. Almost all atomic ops were removed as they are covered under the vm mutex. Alpha and ia64 now need to catch up to i386's trap handlers. FFS and NFS have been tested, other filesystems will need minor changes (grabbing the vm lock when twiddling page properties). Reviewed (partially) by: jake, jhb Notes: svn path=/head/; revision=76827
* 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=55206
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