#
29363fb4 |
|
23-Nov-2023 |
Warner Losh <imp@FreeBSD.org> |
sys: Remove ancient SCCS tags. 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
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#
2ff63af9 |
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16-Aug-2023 |
Warner Losh <imp@FreeBSD.org> |
sys: Remove $FreeBSD$: one-line .h pattern Remove /^\s*\*+\s*\$FreeBSD\$.*$\n/
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#
ec201ddd |
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20-Oct-2022 |
Konstantin Belousov <kib@FreeBSD.org> |
vm_pager: add method to veto page allocation Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D37097
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#
d537d1f1 |
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20-Oct-2022 |
Konstantin Belousov <kib@FreeBSD.org> |
vm_pager: add methods for page insertion and removal notifications Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D37097
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#
f4cdb9d7 |
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31-Jan-2022 |
Konstantin Belousov <kib@FreeBSD.org> |
vm/vm_pager.h: use sys/systm.h header it is needed for __read_mostly attribute definition, which right now comes from vm/vm_page.h including sys/systm.h Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D34089
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#
b730fd30 |
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07-May-2021 |
Konstantin Belousov <kib@FreeBSD.org> |
vm: Add KPI to dynamically register pagers 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
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#
00a3fe96 |
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07-May-2021 |
Konstantin Belousov <kib@FreeBSD.org> |
vm_object_kvme_type(): reimplement by embedding kvme_type into pagerops Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D30168
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#
d474440a |
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03-May-2021 |
Konstantin Belousov <kib@FreeBSD.org> |
Constify vm_pager-related virtual tables. Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D30070
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#
4b8365d7 |
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30-Apr-2021 |
Konstantin Belousov <kib@FreeBSD.org> |
Add OBJT_SWAP_TMPFS pager 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
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#
a7c198a2 |
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30-Apr-2021 |
Konstantin Belousov <kib@FreeBSD.org> |
Implement vm_object_vnode() using vm_pager_getvp() Allow vp_heldp argument to be NULL, in which case the returned vnode is not held for tmpfs swap objects. Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D30070
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#
1390a5cb |
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01-May-2021 |
Konstantin Belousov <kib@FreeBSD.org> |
Add pgo_freespace method Makes the code in vm_object collapse/page_remove cleaner Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D30070
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#
192112b7 |
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30-Apr-2021 |
Konstantin Belousov <kib@FreeBSD.org> |
Add pgo_getvp method This eliminates the staircase of conditions in vm_map_entry_set_vnode_text(). Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D30070
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#
c23c555b |
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30-Apr-2021 |
Konstantin Belousov <kib@FreeBSD.org> |
Add pgo_mightbedirty method Used to implement vm_object_mightbedirty() Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D30070
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#
180bcaa4 |
|
30-Apr-2021 |
Konstantin Belousov <kib@FreeBSD.org> |
vm_pager: add pgo_set_writeable_dirty method specialized for swap and vnode pagers, and used to implement vm_object_set_writeable_dirty(). Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D30070
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#
ee4211bc |
|
30-Apr-2021 |
Konstantin Belousov <kib@FreeBSD.org> |
vm_pager: style some wrappers Fill lines with the function definitions. Use local var to shorten repeated extra-long expressions. Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D30070
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#
cd853791 |
|
27-Nov-2020 |
Konstantin Belousov <kib@FreeBSD.org> |
Make MAXPHYS tunable. Bump MAXPHYS to 1M. Replace MAXPHYS by runtime variable maxphys. It is initialized from MAXPHYS by default, but can be also adjusted with the tunable kern.maxphys. Make b_pages[] array in struct buf flexible. Size b_pages[] for buffer cache buffers exactly to atop(maxbcachebuf) (currently it is sized to atop(MAXPHYS)), and b_pages[] for pbufs is sized to atop(maxphys) + 1. The +1 for pbufs allow several pbuf consumers, among them vmapbuf(), to use unaligned buffers still sized to maxphys, esp. when such buffers come from userspace (*). Overall, we save significant amount of otherwise wasted memory in b_pages[] for buffer cache buffers, while bumping MAXPHYS to desired high value. Eliminate all direct uses of the MAXPHYS constant in kernel and driver sources, except a place which initialize maxphys. Some random (and arguably weird) uses of MAXPHYS, e.g. in linuxolator, are converted straight. Some drivers, which use MAXPHYS to size embeded structures, get private MAXPHYS-like constant; their convertion is out of scope for this work. Changes to cam/, dev/ahci, dev/ata, dev/mpr, dev/mpt, dev/mvs, dev/siis, where either submitted by, or based on changes by mav. Suggested by: mav (*) Reviewed by: imp, mav, imp, mckusick, scottl (intermediate versions) Tested by: pho Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D27225
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#
a720b31c |
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08-Sep-2020 |
Konstantin Belousov <kib@FreeBSD.org> |
Allow consumer to customize physical pager. Add support for user-supplied callbacks into phys pager operations, providing custom getpages(), haspage(), and populate() methods implementations. Pager stores user data ptr/val in the object to provide context. Add phys_pager_allocate() helper that takes user ops table as one of the arguments. Current code for these methods is moved to the 'default' ops table, assigned automatically when vm_pager_alloc() is used. Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D24652
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#
c3aa3bf9 |
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01-Sep-2020 |
Mateusz Guzik <mjg@FreeBSD.org> |
vm: clean up empty lines in .c and .h files
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#
c99d0c58 |
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28-Feb-2020 |
Mark Johnston <markj@FreeBSD.org> |
Add a blocking counter KPI. refcount(9) was recently extended to support waiting on a refcount to drop to zero, as this was needed for a lockless VM object paging-in-progress counter. However, this adds overhead to all uses of refcount(9) and doesn't really match traditional refcounting semantics: once a counter has dropped to zero, the protected object may be freed at any point and it is not safe to dereference the counter. This change removes that extension and instead adds a new set of KPIs, blockcount_*, for use by VM object PIP and busy. Reviewed by: jeff, kib, mjg Tested by: pho Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D23723
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#
a8081778 |
|
14-Dec-2019 |
Jeff Roberson <jeff@FreeBSD.org> |
Add a deferred free mechanism for freeing swap space that does not require an exclusive object lock. Previously swap space was freed on a best effort basis when a page that had valid swap was dirtied, thus invalidating the swap copy. This may be done inconsistently and requires the object lock which is not always convenient. Instead, track when swap space is present. The first dirty is responsible for deleting space or setting PGA_SWAP_FREE which will trigger background scans to free the swap space. Simplify the locking in vm_fault_dirty() now that we can reliably identify the first dirty. Discussed with: alc, kib, markj Differential Revision: https://reviews.freebsd.org/D22654
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#
fe7bcbaf |
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03-Sep-2019 |
Kyle Evans <kevans@FreeBSD.org> |
vm pager: writemapping accounting for OBJT_SWAP Currently writemapping accounting is only done for vnode_pager which does some accounting on the underlying vnode. Extend this to allow accounting to be possible for any of the pager types. New pageops are added to update/release writecount that need to be implemented for any pager wishing to do said accounting, and we implement these methods now for both vnode_pager (unchanged) and swap_pager. The primary motivation for this is to allow other systems with OBJT_SWAP objects to check if their objects have any write mappings and reject operations with EBUSY if so. posixshm will be the first to do so in order to reject adding write seals to the shmfd if any writable mappings exist. Reviewed by: kib, markj Differential Revision: https://reviews.freebsd.org/D21456
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#
4153054a |
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19-Aug-2019 |
Jeff Roberson <jeff@FreeBSD.org> |
Permit vm_pager_has_page() to run with a shared lock. Introduce VM_OBJECT_DROP/VM_OBJECT_PICKUP to handle functions that are called with uncertain lock state. Reviewed by: kib, markj Tested by: pho Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D21310
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#
51369649 |
|
20-Nov-2017 |
Pedro F. Giffuni <pfg@FreeBSD.org> |
sys: further adoption of SPDX licensing ID tags. 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.
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#
fbbd9655 |
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28-Feb-2017 |
Warner Losh <imp@FreeBSD.org> |
Renumber copyright clause 4 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
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#
c42b43a0 |
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08-Dec-2016 |
Konstantin Belousov <kib@FreeBSD.org> |
Add a new populate() pager method and extend device pager ops vector with cdev_pg_populate() to provide device drivers access to it. It gives drivers fine control of the pages ownership and allows drivers to implement arbitrary prefault policies. The populate method is called on a page fault and is supposed to populate the vm object with the page at the fault location and some amount of pages around it, at pager's discretion. VM provides the pager with the hints about current range of the object mapping, to avoid instantiation of immediately unused pages, if pager decides so. Also, VM passes the fault type and map entry protection to the pager, allowing it to force the optimal required ownership of the mapped pages. Installed pages must contiguously fill the returned region, be fully valid and exclusively busied. Of course, the pages must be compatible with the object' type. After populate() successfully returned, VM fault handler installs as many instantiated pages into the process page tables as it sees reasonable, while still obeying the correct semantic for COW and vm map locking. The method is opt-in, pager sets OBJ_POPULATE flag to indicate that the method can be called. If pager' vm objects can be shadowed, pager must implement the traditional getpages() method in addition to the populate(). Populate() might fall back to the getpages() on per-call basis as well, by returning VM_PAGER_BAD error code. For now for device pagers, the populate() method is only allowed to be used by the managed device pagers, but the limitation is only made because there is no unmanaged fault handlers which could use it right now. KPI designed together with, and reviewed by: alc Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 3 weeks
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#
99e6e193 |
|
23-Nov-2016 |
Mark Johnston <markj@FreeBSD.org> |
Release laundered vnode pages to the head of the inactive queue. The swap pager enqueues laundered pages near the head of the inactive queue to avoid another trip through LRU before reclamation. This change adds support for this behaviour to the vnode pager and makes use of it in UFS and ext2fs. Some ioflag handling is consolidated into a common subroutine so that this support can be easily extended to other filesystems which make use of the buffer cache. No changes are needed for ZFS since its putpages routine always undirties the pages before returning, and the laundry thread requeues the pages appropriately in this case. Reviewed by: alc, kib Differential Revision: https://reviews.freebsd.org/D8589
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#
1dcadc02 |
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30-Oct-2016 |
Konstantin Belousov <kib@FreeBSD.org> |
Remove vm_pager_has_page() declaration. It is not too useful since static inline definition appears later in the file. Reviewed by: alc Sponsored by: The FreeBSD Foundation MFC after: 1 week
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#
b0cd2017 |
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16-Dec-2015 |
Gleb Smirnoff <glebius@FreeBSD.org> |
A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES(). o With new KPI consumers can request contiguous ranges of pages, and unlike before, all pages will be kept busied on return, like it was done before with the 'reqpage' only. Now the reqpage goes away. With new interface it is easier to implement code protected from race conditions. Such arrayed requests for now should be preceeded by a call to vm_pager_haspage() to make sure that request is possible. This could be improved later, making vm_pager_haspage() obsolete. Strenghtening the promises on the business of the array of pages allows us to remove such hacks as swp_pager_free_nrpage() and vm_pager_free_nonreq(). o New KPI accepts two integer pointers that may optionally point at values for read ahead and read behind, that a pager may do, if it can. These pages are completely owned by pager, and not controlled by the caller. This shifts the UFS-specific readahead logic from vm_fault.c, which should be file system agnostic, into vnode_pager.c. It also removes one VOP_BMAP() request per hard fault. Discussed with: kib, alc, jeff, scottl Sponsored by: Nginx, Inc. Sponsored by: Netflix
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#
093ebe1d |
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17-Jun-2015 |
Gleb Smirnoff <glebius@FreeBSD.org> |
o Un-inline vm_pager_get_pages(), vm_pager_get_pages_async(). o Provide an extensive set of assertions for input array of pages. o Remove now duplicate assertions from different pagers. Sponsored by: Nginx, Inc. Sponsored by: Netflix
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#
4d6481a4 |
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17-Mar-2015 |
Gleb Smirnoff <glebius@FreeBSD.org> |
o Enhance vm_pager_free_nonreq() function: - Allow to call the function with vm object lock held. - Allow to specify reqpage that doesn't match any page in the region, meaning freeing all pages. o Utilize the new function in couple more places in vnode pager. Reviewed by: alc, kib Sponsored by: Netflix Sponsored by: Nginx, Inc.
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#
90effb23 |
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22-Nov-2014 |
Gleb Smirnoff <glebius@FreeBSD.org> |
Merge from projects/sendfile: o Provide a new VOP_GETPAGES_ASYNC(), which works like VOP_GETPAGES(), but doesn't sleep. It returns immediately, and will execute the I/O done handler function that must be supplied as argument. o Provide VOP_GETPAGES_ASYNC() for the FFS, which uses vnode_pager. o Extend pagertab to support pgo_getpages_async method, and implement this method for vnode_pager. Reviewed by: kib Tested by: pho Sponsored by: Netflix Sponsored by: Nginx, Inc.
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#
e1a44545 |
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14-Nov-2014 |
Gleb Smirnoff <glebius@FreeBSD.org> |
Even better indent struct pagerops.
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#
5536922e |
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14-Nov-2014 |
Gleb Smirnoff <glebius@FreeBSD.org> |
Constantly indent struct pagerops.
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#
396b3e34 |
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14-Sep-2014 |
Alan Cox <alc@FreeBSD.org> |
Avoid an exclusive acquisition of the object lock on the expected execution path through the NFS clients' getpages functions. Introduce vm_pager_free_nonreq(). This function can be used to eliminate code that is duplicated in many getpages functions. Also, in contrast to the code that currently appears in those getpages functions, vm_pager_free_nonreq() avoids acquiring an exclusive object lock in one case. Reviewed by: kib MFC after: 6 weeks Sponsored by: EMC / Isilon Storage Division
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#
385b4265 |
|
06-Aug-2014 |
Konstantin Belousov <kib@FreeBSD.org> |
The vm_pager_page_unswapped() pager op is only implemented for the swap pager. Swap pager uses a private mutex to protect swap metadata, and does not rely on the vm object lock to ensure integrity of it. Weaken the requirement for the vm object lock by only asserting locked object in vm_pager_page_unswapped(), instead of locked exclusively. Reviewed by: alc Sponsored by: The FreeBSD Foundation MFC after: 1 week
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#
5f518366 |
|
27-Jun-2013 |
Jeff Roberson <jeff@FreeBSD.org> |
- Add a general purpose resource allocator, vmem, from NetBSD. It was 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
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#
89f6b863 |
|
08-Mar-2013 |
Attilio Rao <attilio@FreeBSD.org> |
Switch the vm_object mutex to be a rwlock. This will enable in the future further optimizations where the vm_object lock will be held in read mode most of the time the page cache resident pool of pages are accessed for reading purposes. The change is mostly mechanical but few notes are reported: * The KPI changes as follow: - VM_OBJECT_LOCK() -> VM_OBJECT_WLOCK() - VM_OBJECT_TRYLOCK() -> VM_OBJECT_TRYWLOCK() - VM_OBJECT_UNLOCK() -> VM_OBJECT_WUNLOCK() - VM_OBJECT_LOCK_ASSERT(MA_OWNED) -> VM_OBJECT_ASSERT_WLOCKED() (in order to avoid visibility of implementation details) - The read-mode operations are added: VM_OBJECT_RLOCK(), VM_OBJECT_TRYRLOCK(), VM_OBJECT_RUNLOCK(), VM_OBJECT_ASSERT_RLOCKED(), VM_OBJECT_ASSERT_LOCKED() * The vm/vm_pager.h namespace pollution avoidance (forcing requiring sys/mutex.h in consumers directly to cater its inlining functions using VM_OBJECT_LOCK()) imposes that all the vm/vm_pager.h consumers now must include also sys/rwlock.h. * zfs requires a quite convoluted fix to include FreeBSD rwlocks into the compat layer because the name clash between FreeBSD and solaris versions must be avoided. At this purpose zfs redefines the vm_object locking functions directly, isolating the FreeBSD components in specific compat stubs. The KPI results heavilly broken by this commit. Thirdy part ports must be updated accordingly (I can think off-hand of VirtualBox, for example). Sponsored by: EMC / Isilon storage division Reviewed by: jeff Reviewed by: pjd (ZFS specific review) Discussed with: alc Tested by: pho
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#
b7ac5a85 |
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12-May-2012 |
Konstantin Belousov <kib@FreeBSD.org> |
Add new pager type, OBJT_MGTDEVICE. It provides the device pager 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
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#
286790a7 |
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15-Nov-2011 |
Konstantin Belousov <kib@FreeBSD.org> |
Update the device pager interface, while keeping the compatibility layer for old KPI and KBI. New interface should be used together with d_mmap_single cdevsw method. Device pager can be allocated with the cdev_pager_allocate(9) function, which takes struct cdev_pager_ops, containing constructor/destructor and page fault handler methods supplied by driver. Constructor and destructor, called at the pager allocation and deallocation time, allow the driver to handle per-object private data. The pager handler is called to handle page fault on the vm map entry backed by the driver pager. Driver shall return either the vm_page_t which should be mapped, or error code (which does not cause kernel panic anymore). The page handler interface has a placeholder to specify the access mode causing the fault, but currently PROT_READ is always passed there. Sponsored by: The FreeBSD Foundation Reviewed by: alc MFC after: 1 month
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#
2c4992db |
|
17-Jan-2011 |
Alan Cox <alc@FreeBSD.org> |
Move the definition of M_VMPGDATA to the swap pager, where the only remaining uses are.
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#
a7d5f7eb |
|
19-Oct-2010 |
Jamie Gritton <jamie@FreeBSD.org> |
A new jail(8) with a configuration file, to replace the work currently done by /etc/rc.d/jail.
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#
e239bb97 |
|
04-Jul-2010 |
Konstantin Belousov <kib@FreeBSD.org> |
Reimplement vm_object_page_clean(), using the fact that vm object memq is ordered by page index. This greatly simplifies the implementation, since we no longer need to mark the pages with VPO_CLEANCHK to denote the progress. It is enough to remember the current position by index before dropping the object lock. Remove VPO_CLEANCHK and VM_PAGER_IGNORE_CLEANCHK as unused. Garbage-collect vm.msync_flush_flags sysctl. Suggested and reviewed by: alc Tested by: pho
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#
01381811 |
|
24-Jul-2009 |
John Baldwin <jhb@FreeBSD.org> |
Add a new type of VM object: OBJT_SG. An OBJT_SG object is very similar to 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
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#
3364c323 |
|
23-Jun-2009 |
Konstantin Belousov <kib@FreeBSD.org> |
Implement global and per-uid accounting of the anonymous memory. Add 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)
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#
fe6ad778 |
|
06-Jun-2009 |
Alan Cox <alc@FreeBSD.org> |
Eliminate an unneeded forward declaration. (This should have been removed in revision 1.42.)
|
#
d7f03759 |
|
19-Oct-2008 |
Ulf Lilleengen <lulf@FreeBSD.org> |
- Import the HEAD csup code which is the basis for the cvsmode work.
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#
cf51adc0 |
|
18-May-2005 |
Alan Cox <alc@FreeBSD.org> |
Update some comments to reflect the change from spl-based to lock-based synchronization.
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#
60727d8b |
|
06-Jan-2005 |
Warner Losh <imp@FreeBSD.org> |
/* -> /*- for license, minor formatting changes
|
#
d20b2f76 |
|
09-Nov-2004 |
Poul-Henning Kamp <phk@FreeBSD.org> |
Improve readability with a bunch of typedefs for the pager ops. These can also be used for prototypes in the pagers.
|
#
41f1b2c4 |
|
08-Apr-2004 |
Alan Cox <alc@FreeBSD.org> |
The demise of vm_pager_map_page() in revision 1.93 of vm/vm_pager.c permits the reduction of the pager map's size by 8M bytes. In other words, eight megabytes of largely wasted KVA are returned to the kernel map for use elsewhere.
|
#
05eb3785 |
|
06-Apr-2004 |
Warner Losh <imp@FreeBSD.org> |
Remove advertising clause from University of California Regent's license, per letter dated July 22, 1999. Approved by: core
|
#
9e0ddbd0 |
|
06-Apr-2004 |
Alan Cox <alc@FreeBSD.org> |
Eliminate vm_pager_map_page() and vm_pager_unmap_page() and their uses. Use sf_buf_alloc() and sf_buf_free() instead.
|
#
2e3b314d |
|
24-Oct-2003 |
Alan Cox <alc@FreeBSD.org> |
- Push down Giant from vm_pageout() to vm_pageout_scan(), freeing vm_pageout_page_stats() from Giant. - Modify vm_pager_put_pages() and vm_pager_page_unswapped() to expect the vm object to be locked on entry. (All of the pager routines now expect this.)
|
#
f976cfd9 |
|
06-Aug-2003 |
Poul-Henning Kamp <phk@FreeBSD.org> |
Add XXX: comment to vm_pager_unswapped().
|
#
e04e4bac |
|
05-Aug-2003 |
Poul-Henning Kamp <phk@FreeBSD.org> |
Use sparse struct initialization for struct pagerops. Mark our buffers B_KEEPGIANT before sending them downstream. Remove swap_pager_strategy implementation.
|
#
745f3305 |
|
03-Aug-2003 |
Poul-Henning Kamp <phk@FreeBSD.org> |
Move extern declaration of the various pagerops from vm_pager.c to vm_pager.h where the various pagers will also see them.
|
#
f566a0b6 |
|
23-Jun-2003 |
Alan Cox <alc@FreeBSD.org> |
Assert that the vm object is locked on entry to vm_pager_get_pages().
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f29ba63e |
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22-Jun-2003 |
Alan Cox <alc@FreeBSD.org> |
Maintain a lock on the vm object of interest throughout vm_fault(), releasing the lock only if we are about to sleep (e.g., vm_pager_get_pages() or vm_pager_has_pages()). If we sleep, we have marked the vm object with the paging-in-progress flag.
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8630c117 |
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12-Jun-2003 |
Alan Cox <alc@FreeBSD.org> |
Add vm object locking to various pagers' "get pages" methods, i386 stack management functions, and a u area management function.
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43b7990e |
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28-Dec-2002 |
Matthew Dillon <dillon@FreeBSD.org> |
Allow the VM object flushing code to cluster. When the filesystem syncer comes along and flushes a file which has been mmap()'d SHARED/RW, with dirty pages, it was flushing the underlying VM object asynchronously, resulting in thousands of 8K writes. With this change the VM Object flushing code will cluster dirty pages in 64K blocks. Note that until the low memory deadlock issue is reviewed, it is not safe to allow the pageout daemon to use this feature. Forced pageouts still use fs block size'd ops for the moment. MFC after: 3 days
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c2eda4b5 |
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30-Jun-2002 |
Alan Cox <alc@FreeBSD.org> |
o Remove some long dead code: from revision 1.41 of vm/vm_pager.c 3+ years ago. o Remove some unused prototypes.
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11caded3 |
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19-Mar-2002 |
Alfred Perlstein <alfred@FreeBSD.org> |
Remove __P.
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a1287949 |
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10-Mar-2002 |
Eivind Eklund <eivind@FreeBSD.org> |
- Remove a number of extra newlines that do not belong here according to style(9) - Minor space adjustment in cases where we have "( ", " )", if(), return(), while(), for(), etc. - Add /* SYMBOL */ after a few #endifs. Reviewed by: alc
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0cddd8f0 |
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04-Jul-2001 |
Matthew Dillon <dillon@FreeBSD.org> |
With Alfred's permission, remove vm_mtx in favor of a fine-grained approach (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.
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23955314 |
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18-May-2001 |
Alfred Perlstein <alfred@FreeBSD.org> |
Introduce a global lock for the vm subsystem (vm_mtx). 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
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2a758ebe |
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13-Apr-2001 |
Alfred Perlstein <alfred@FreeBSD.org> |
protect pbufs and associated counts with a mutex
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e3975643 |
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25-May-2000 |
Jake Burkholder <jake@FreeBSD.org> |
Back out the previous change to the queue(3) interface. It was not discussed and should probably not happen. Requested by: msmith and others
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740a1973 |
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23-May-2000 |
Jake Burkholder <jake@FreeBSD.org> |
Change the way that the queue(3) structures are declared; don't assume that the type argument to *_HEAD and *_ENTRY is a struct. Suggested by: phk Reviewed by: phk Approved by: mdodd
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0b441832 |
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03-May-2000 |
Poul-Henning Kamp <phk@FreeBSD.org> |
Convert the vm_pager_strategy() interface to take a struct bio instead of a struct buf. Don't try to examine B_ASYNC, it is a layering violation to do so. The only current user of this interface is vn(4) which, since it emulates a disk interface, operates on struct bio already.
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e4057dbd |
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01-May-2000 |
Poul-Henning Kamp <phk@FreeBSD.org> |
Move and staticize the bufchain functions so they become local to the only piece of code using them. This will ease a rewrite of them.
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25db2c54 |
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27-Mar-2000 |
Matthew Dillon <dillon@FreeBSD.org> |
Add necessary spl protection for swapper. The problem was located by Alfred while testing his SPLASSERT stuff. This is not a complete fix, more protections are probably needed.
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c4473420 |
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28-Dec-1999 |
Peter Wemm <peter@FreeBSD.org> |
Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL" 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.
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c3aac50f |
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27-Aug-1999 |
Peter Wemm <peter@FreeBSD.org> |
$Id$ -> $FreeBSD$
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4221e284 |
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02-May-1999 |
Alan Cox <alc@FreeBSD.org> |
The VFS/BIO subsystem contained a number of hacks in order to optimize piecemeal, middle-of-file writes for NFS. These hacks have caused no end of trouble, especially when combined with mmap(). I've removed them. Instead, NFS will issue a read-before-write to fully instantiate the struct buf containing the write. NFS does, however, optimize piecemeal appends to files. For most common file operations, you will not notice the difference. The sole remaining fragment in the VFS/BIO system is b_dirtyoff/end, which NFS uses to avoid cache coherency issues with read-merge-write style operations. NFS also optimizes the write-covers-entire-buffer case by avoiding the read-before-write. There is quite a bit of room for further optimization in these areas. The VM system marks pages fully-valid (AKA vm_page_t->valid = VM_PAGE_BITS_ALL) in several places, most noteably in vm_fault. This is not correct operation. The vm_pager_get_pages() code is now responsible for marking VM pages all-valid. A number of VM helper routines have been added to aid in zeroing-out the invalid portions of a VM page prior to the page being marked all-valid. This operation is necessary to properly support mmap(). The zeroing occurs most often when dealing with file-EOF situations. Several bugs have been fixed in the NFS subsystem, including bits handling file and directory EOF situations and buf->b_flags consistancy issues relating to clearing B_ERROR & B_INVAL, and handling B_DONE. getblk() and allocbuf() have been rewritten. B_CACHE operation is now formally defined in comments and more straightforward in implementation. B_CACHE for VMIO buffers is based on the validity of the backing store. B_CACHE for non-VMIO buffers is based simply on whether the buffer is B_INVAL or not (B_CACHE set if B_INVAL clear, and vise-versa). biodone() is now responsible for setting B_CACHE when a successful read completes. B_CACHE is also set when a bdwrite() is initiated and when a bwrite() is initiated. VFS VOP_BWRITE routines (there are only two - nfs_bwrite() and bwrite()) are now expected to set B_CACHE. This means that bowrite() and bawrite() also set B_CACHE indirectly. There are a number of places in the code which were previously using buf->b_bufsize (which is DEV_BSIZE aligned) when they should have been using buf->b_bcount. These have been fixed. getblk() now clears B_DONE on return because the rest of the system is so bad about dealing with B_DONE. Major fixes to NFS/TCP have been made. A server-side bug could cause requests to be lost by the server due to nfs_realign() overwriting other rpc's in the same TCP mbuf chain. The server's kernel must be recompiled to get the benefit of the fixes. Submitted by: Matthew Dillon <dillon@apollo.backplane.com>
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a5296b05 |
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14-Mar-1999 |
Julian Elischer <julian@FreeBSD.org> |
Submitted by: Matt Dillon <dillon@freebsd.org> The old VN device broke in -4.x when the definition of B_PAGING changed. This patch fixes this plus implements additional capabilities. The new VN device can be backed by a file ( as per normal ), or it can be directly backed by swap. Due to dependencies in VM include files (on opt_xxx options) the new vn device cannot be a module yet. This will be fixed in a later commit. This commit delimitted by tags {PRE,POST}_MATT_VNDEV
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e4542174 |
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23-Jan-1999 |
Matthew Dillon <dillon@FreeBSD.org> |
vm_pager_put_pages() is passed an rcval array to hold per-page return values. The 'int' return value for the procedure was never used and not well defined in any case when there are mixed errors on pages, so it has been removed. vm_pager_put_pages() and associated vm_pager functions now return void.
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aa91dfc6 |
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21-Jan-1999 |
Matthew Dillon <dillon@FreeBSD.org> |
Move many of the vm_pager_*() functions from vm_pager.c to inlines in vm_pager.h
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1c7c3c6a |
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21-Jan-1999 |
Matthew Dillon <dillon@FreeBSD.org> |
This is a rather large commit that encompasses the new swapper, changes to the VM system to support the new swapper, VM bug fixes, several VM optimizations, and some additional revamping of the VM code. The specific bug fixes will be documented with additional forced commits. This commit is somewhat rough in regards to code cleanup issues. Reviewed by: "John S. Dyson" <root@dyson.iquest.net>, "David Greenman" <dg@root.com>
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6cde7a16 |
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13-Oct-1998 |
David Greenman <dg@FreeBSD.org> |
Fixed two potentially serious classes of bugs: 1) The vnode pager wasn't properly tracking the file size due to "size" being page rounded in some cases and not in others. This sometimes resulted in corrupted files. First noticed by Terry Lambert. Fixed by changing the "size" pager_alloc parameter to be a 64bit byte value (as opposed to a 32bit page index) and changing the pagers and their callers to deal with this properly. 2) Fixed a bogus type cast in round_page() and trunc_page() that caused some 64bit offsets and sizes to be scrambled. Removing the cast required adding casts at a few dozen callers. There may be problems with other bogus casts in close-by macros. A quick check seemed to indicate that those were okay, however.
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8f9110f6 |
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07-Mar-1998 |
John Dyson <dyson@FreeBSD.org> |
This mega-commit is meant to fix numerous interrelated problems. There has been some bitrot and incorrect assumptions in the vfs_bio code. These problems have manifest themselves worse on NFS type filesystems, but can still affect local filesystems under certain circumstances. Most of the problems have involved mmap consistancy, and as a side-effect broke the vfs.ioopt code. This code might have been committed seperately, but almost everything is interrelated. 1) Allow (pmap_object_init_pt) prefaulting of buffer-busy pages that are fully valid. 2) Rather than deactivating erroneously read initial (header) pages in kern_exec, we now free them. 3) Fix the rundown of non-VMIO buffers that are in an inconsistent (missing vp) state. 4) Fix the disassociation of pages from buffers in brelse. The previous code had rotted and was faulty in a couple of important circumstances. 5) Remove a gratuitious buffer wakeup in vfs_vmio_release. 6) Remove a crufty and currently unused cluster mechanism for VBLK files in vfs_bio_awrite. When the code is functional, I'll add back a cleaner version. 7) The page busy count wakeups assocated with the buffer cache usage were incorrectly cleaned up in a previous commit by me. Revert to the original, correct version, but with a cleaner implementation. 8) The cluster read code now tries to keep data associated with buffers more aggressively (without breaking the heuristics) when it is presumed that the read data (buffers) will be soon needed. 9) Change to filesystem lockmgr locks so that they use LK_NOPAUSE. The delay loop waiting is not useful for filesystem locks, due to the length of the time intervals. 10) Correct and clean-up spec_getpages. 11) Implement a fully functional nfs_getpages, nfs_putpages. 12) Fix nfs_write so that modifications are coherent with the NFS data on the server disk (at least as well as NFS seems to allow.) 13) Properly support MS_INVALIDATE on NFS. 14) Properly pass down MS_INVALIDATE to lower levels of the VM code from vm_map_clean. 15) Better support the notion of pages being busy but valid, so that fewer in-transit waits occur. (use p->busy more for pageouts instead of PG_BUSY.) Since the page is fully valid, it is still usable for reads. 16) It is possible (in error) for cached pages to be busy. Make the page allocation code handle that case correctly. (It should probably be a printf or panic, but I want the system to handle coding errors robustly. I'll probably add a printf.) 17) Correct the design and usage of vm_page_sleep. It didn't handle consistancy problems very well, so make the design a little less lofty. After vm_page_sleep, if it ever blocked, it is still important to relookup the page (if the object generation count changed), and verify it's status (always.) 18) In vm_pageout.c, vm_pageout_clean had rotted, so clean that up. 19) Push the page busy for writes and VM_PROT_READ into vm_pageout_flush. 20) Fix vm_pager_put_pages and it's descendents to support an int flag instead of a boolean, so that we can pass down the invalidate bit.
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e7a58978 |
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03-Feb-1998 |
Bruce Evans <bde@FreeBSD.org> |
Added #include of <sys/queue.h> so that this file is more "self"-sufficent.
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a1c995b6 |
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12-Oct-1997 |
Poul-Henning Kamp <phk@FreeBSD.org> |
Last major round (Unless Bruce thinks of somthing :-) of malloc changes. Distribute all but the most fundamental malloc types. This time I also remembered the trick to making things static: Put "static" in front of them. A couple of finer points by: bde
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6875d254 |
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22-Feb-1997 |
Peter Wemm <peter@FreeBSD.org> |
Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not ready for it yet.
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1130b656 |
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14-Jan-1997 |
Jordan K. Hubbard <jkh@FreeBSD.org> |
Make the long-awaited change from $Id$ to $FreeBSD$ 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.
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8169788f |
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11-Mar-1996 |
Peter Wemm <peter@FreeBSD.org> |
Import 4.4BSD-Lite2 onto the vendor branch, note that in the kernel, all files are off the vendor branch, so this should not change anything. A "U" marker generally means that the file was not changed in between the 4.4Lite and Lite-2 releases, and does not need a merge. "C" generally means that there was a change.
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a316d390 |
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10-Dec-1995 |
John Dyson <dyson@FreeBSD.org> |
Changes to support 1Tb filesizes. Pages are now named by an (object,index) pair instead of (object,offset) pair.
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3af76890 |
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19-Nov-1995 |
Poul-Henning Kamp <phk@FreeBSD.org> |
Remove unused vars & funcs, make things static, protoize a little bit.
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28f8db14 |
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29-Jul-1995 |
Bruce Evans <bde@FreeBSD.org> |
Eliminate sloppy common-style declarations. There should be none left for the LINT configuation.
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24a1cce3 |
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13-Jul-1995 |
David Greenman <dg@FreeBSD.org> |
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).
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ee3a64c9 |
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10-May-1995 |
David Greenman <dg@FreeBSD.org> |
Changed "handle" from type caddr_t to void *; "handle" is several different types of pointers, and "char *" is a bad choice for the type.
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b5e8ce9f |
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16-Mar-1995 |
Bruce Evans <bde@FreeBSD.org> |
Add and move declarations to fix all of the warnings from `gcc -Wimplicit' (except in netccitt, netiso and netns) and most of the warnings from `gcc -Wnested-externs'. Fix all the bugs found. There were no serious ones.
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0d94caff |
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09-Jan-1995 |
David Greenman <dg@FreeBSD.org> |
These changes embody the support of the fully coherent merged VM buffer cache, much higher filesystem I/O performance, and much better paging performance. It represents the culmination of over 6 months of R&D. The majority of the merged VM/cache work is by John Dyson. The following highlights the most significant changes. Additionally, there are (mostly minor) changes to the various filesystem modules (nfs, msdosfs, etc) to support the new VM/buffer scheme. vfs_bio.c: Significant rewrite of most of vfs_bio to support the merged VM buffer cache scheme. The scheme is almost fully compatible with the old filesystem interface. Significant improvement in the number of opportunities for write clustering. vfs_cluster.c, vfs_subr.c Upgrade and performance enhancements in vfs layer code to support merged VM/buffer cache. Fixup of vfs_cluster to eliminate the bogus pagemove stuff. vm_object.c: Yet more improvements in the collapse code. Elimination of some windows that can cause list corruption. vm_pageout.c: Fixed it, it really works better now. Somehow in 2.0, some "enhancements" broke the code. This code has been reworked from the ground-up. vm_fault.c, vm_page.c, pmap.c, vm_object.c Support for small-block filesystems with merged VM/buffer cache scheme. pmap.c vm_map.c Dynamic kernel VM size, now we dont have to pre-allocate excessive numbers of kernel PTs. vm_glue.c Much simpler and more effective swapping code. No more gratuitous swapping. proc.h Fixed the problem that the p_lock flag was not being cleared on a fork. swap_pager.c, vnode_pager.c Removal of old vfs_bio cruft to support the past pseudo-coherency. Now the code doesn't need it anymore. machdep.c Changes to better support the parameter values for the merged VM/buffer cache scheme. machdep.c, kern_exec.c, vm_glue.c Implemented a seperate submap for temporary exec string space and another one to contain process upages. This eliminates all map fragmentation problems that previously existed. ffs_inode.c, ufs_inode.c, ufs_readwrite.c Changes for merged VM/buffer cache. Add "bypass" support for sneaking in on busy buffers. Submitted by: John Dyson and David Greenman
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05f0fdd2 |
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08-Oct-1994 |
Poul-Henning Kamp <phk@FreeBSD.org> |
Cosmetics: unused vars, ()'s, #include's &c &c to silence gcc. Reviewed by: davidg
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3c4dd356 |
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02-Aug-1994 |
David Greenman <dg@FreeBSD.org> |
Added $Id$
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26f9a767 |
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25-May-1994 |
Rodney W. Grimes <rgrimes@FreeBSD.org> |
The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch. Reviewed by: Rodney W. Grimes Submitted by: John Dyson and David Greenman
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df8bae1d |
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24-May-1994 |
Rodney W. Grimes <rgrimes@FreeBSD.org> |
BSD 4.4 Lite Kernel Sources
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