#
267654 |
|
19-Jun-2014 |
gjb |
Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.
Approved by: re (implicit) Sponsored by: The FreeBSD Foundation |
#
263361 |
|
19-Mar-2014 |
kib |
MFC r263095: Initialize paddr to handle the case of zero size.
|
#
240238 |
|
08-Sep-2012 |
kib |
MFC r239065: Stop including vm_param.h into vm_page.h. Include vm_param.h explicitely for the kernel code which needs it.
|
#
236925 |
|
11-Jun-2012 |
kib |
MFC r235375: Add new pager type, OBJT_MGTDEVICE. It provides the device pager which carries fictitous managed pges. 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.
|
#
235983 |
|
25-May-2012 |
kib |
MFC r235603: Do not double-reference the found vm object in cdev_pager_lookup(). vm_pager_object_lookup() already referenced the object.
|
#
229383 |
|
03-Jan-2012 |
kib |
MFC r227530: Update the device pager interface.
Sponsored by: The FreeBSD Foundation
|
#
225736 |
|
22-Sep-2011 |
kensmith |
Copy head to stable/9 as part of 9.0-RELEASE release cycle.
Approved by: re (implicit)
|
#
224522 |
|
30-Jul-2011 |
kib |
Fix a race in the device pager allocation. If another thread won and allocated the device pager for the given handle, then the object fictitious pages list and the object membership in the global object list still need to be initialized. Otherwise, dev_pager_dealloc() will traverse uninitialized pointers.
Reported and tested by: pho Reviewed by: jhb Approved by: re (kensmith) MFC after: 1 week
|
#
223823 |
|
06-Jul-2011 |
attilio |
Handle a race between device_pager and devsw in a more graceful manner: return an error code rather than panic the kernel.
Sponsored by: Sandvine Incorporated Reviewed by: kib Tested by: pho MFC after: 2 weeks
|
#
219476 |
|
11-Mar-2011 |
alc |
Eliminate duplication of the fake page code and zone by the device and sg pagers.
Reviewed by: jhb
|
#
217508 |
|
17-Jan-2011 |
alc |
Explicitly initialize the page's queue field to PQ_NONE instead of relying on PQ_NONE being zero.
Redefine PQ_NONE and PQ_COUNT so that a page queue isn't allocated for PQ_NONE.
Reviewed by: kib@
|
#
210923 |
|
06-Aug-2010 |
kib |
Add new make_dev_p(9) flag MAKEDEV_ETERNAL to inform devfs that created cdev will never be destroyed. Propagate the flag to devfs vnodes as VV_ETERNVALDEV. Use the flags to avoid acquiring devmtx and taking a thread reference on such nodes.
In collaboration with: pho MFC after: 1 month
|
#
207728 |
|
06-May-2010 |
alc |
Eliminate page queues locking around most calls to vm_page_free().
|
#
207410 |
|
29-Apr-2010 |
kmacy |
On Alan's advice, rather than do a wholesale conversion on a single architecture from page queue lock to a hashed array of page locks (based on a patch by Jeff Roberson), I've implemented page lock support in the MI code and have only moved vm_page's hold_count out from under page queue mutex to page lock. This changes pmap_extract_and_hold on all pmaps.
Supported by: Bitgravity Inc.
Discussed with: alc, jeffr, and kib
|
#
201223 |
|
29-Dec-2009 |
rnoland |
Update d_mmap() to accept vm_ooffset_t and vm_memattr_t.
This replaces d_mmap() with the d_mmap2() implementation and also changes the type of offset to vm_ooffset_t.
Purge d_mmap2().
All driver modules will need to be rebuilt since D_VERSION is also bumped.
Reviewed by: jhb@ MFC after: Not in this lifetime...
|
#
196615 |
|
28-Aug-2009 |
jhb |
Extend the device pager to support different memory attributes on different 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
|
#
195774 |
|
19-Jul-2009 |
alc |
Change the handling of fictitious pages by pmap_page_set_memattr() on amd64 and i386. Essentially, fictitious pages provide a mechanism for creating aliases for either normal or device-backed pages. Therefore, pmap_page_set_memattr() on a fictitious page needn't update the direct map or flush the cache. Such actions are the responsibility of the "primary" instance of the page or the device driver that "owns" the physical address. For example, these actions are already performed by pmap_mapdev().
The device pager needn't restore the memory attributes on a fictitious page before releasing it. It's now pointless.
Add pmap_page_set_memattr() to the Xen pmap.
Approved by: re (kib)
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#
195649 |
|
12-Jul-2009 |
alc |
Add support to the virtual memory system for configuring machine- 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)
|
#
194766 |
|
23-Jun-2009 |
kib |
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)
|
#
194642 |
|
22-Jun-2009 |
alc |
Validate the page in one place, dev_pager_getpages(), rather than doing it in two places, dev_pager_getfake() and dev_pager_updatefake().
Compare a pointer to "NULL" rather than "0".
|
#
194562 |
|
20-Jun-2009 |
alc |
Strive for greater consistency among the places that implement real, fictious, and contiguous page allocation. Eliminate unnecessary reinitialization of a page's fields.
|
#
183383 |
|
26-Sep-2008 |
kib |
Save previous content of the td_fpop before storing the current filedescriptor into it. Make sure that td_fpop is NULL when calling d_mmap from dev_pager_getpages().
Change guards against td_fpop field being non-NULL with private state for another device, and against sudden clearing the td_fpop. This could occur when either a driver method calls another driver through the filedescriptor operation, or a page fault happen while driver is writing to a memory backed by another driver.
Noted by: rwatson Tested by: rnoland MFC after: 3 days
|
#
179074 |
|
17-May-2008 |
alc |
Preset a device object's alignment ("pg_color") based upon the physical address of the device's memory. This enables pmap_align_superpage() to propose a virtual address for mapping the device memory that permits the use of superpage mappings.
|
#
171889 |
|
18-Aug-2007 |
kib |
Remove comment that is no longer quite true.
Noted by: alc Approved by: re (kensmith)
|
#
171779 |
|
07-Aug-2007 |
kib |
Protect the creation of the device pager with the dev_pager_mtx. Lookup of device pager in the pagers list by handle is now synchronized with its removal from the list, and dev_pager_mtx is put before vm object lock in lock order. Dispose the dev_pager_sx lock, since dev_pager_mtx now covers the same block.
Noted by: kensmith Reviewed by: alc Approved by: re (kensmith)
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#
171737 |
|
05-Aug-2007 |
alc |
Consider a scenario in which one processor, call it Pt, is performing vm_object_terminate() on a device-backed object at the same time that another processor, call it Pa, is performing dev_pager_alloc() on the same device. The problem is that vm_pager_object_lookup() should not be allowed to return a doomed object, i.e., an object with OBJ_DEAD set, but it does. In detail, the unfortunate sequence of events is: Pt in vm_object_terminate() holds the doomed object's lock and sets OBJ_DEAD on the object. Pa in dev_pager_alloc() holds dev_pager_sx and calls vm_pager_object_lookup(), which returns the doomed object. Next, Pa calls vm_object_reference(), which requires the doomed object's lock, so Pa waits for Pt to release the doomed object's lock. Pt proceeds to the point in vm_object_terminate() where it releases the doomed object's lock. Pa is now able to complete vm_object_reference() because it can now complete the acquisition of the doomed object's lock. So, now the doomed object has a reference count of one! Pa releases dev_pager_sx and returns the doomed object from dev_pager_alloc(). Pt now acquires dev_pager_mtx, removes the doomed object from dev_pager_object_list, releases dev_pager_mtx, and finally calls uma_zfree with the doomed object. However, the doomed object is still in use by Pa.
Repeating my key point, vm_pager_object_lookup() must not return a doomed object. Moreover, the test for the object's state, i.e., doomed or not, and the increment of the object's reference count should be carried out atomically.
Reviewed by: kib Approved by: re (kensmith) MFC after: 3 weeks
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#
171725 |
|
05-Aug-2007 |
kib |
Do not acquire Giant unconditionally around the calls to the cdevsw d_mmap methods. prep_cdevsw() already installs the shims that acquire/drop Giant for the methods of a driver that specified the D_NEEDGIANT flag.
Reviewed by: alc Approved by: re (kensmith)
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#
163604 |
|
22-Oct-2006 |
alc |
Replace PG_BUSY with VPO_BUSY. In other words, changes to the page's busy flag, i.e., VPO_BUSY, are now synchronized by the per-vm object lock instead of the global page queues lock.
|
#
161213 |
|
11-Aug-2006 |
alc |
Ensure that the page's new field for object-synchronized flags is always initialized to zero.
Call vm_page_sleep_if_busy() instead of duplicating its implementation in vm_page_grab().
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#
147262 |
|
10-Jun-2005 |
alc |
Add a comment to the effect that fictitious pages do not require the initialization of their machine-dependent fields.
|
#
139825 |
|
07-Jan-2005 |
imp |
/* -> /*- for license, minor formatting changes
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#
135707 |
|
24-Sep-2004 |
phk |
Use dev_re[fl]thread() to maintain a ref on the device driver while we call the ->d_mmap function.
|
#
133113 |
|
04-Aug-2004 |
dfr |
In dev_pager_updatefake, m->valid is typically 0 on entry. It should be set to VM_PAGE_BITS_ALL before returning, to ensure that neither vm_pager_get_pages nor vm_fault calls vm_page_zero_invalid after dev_pager_getpages has returned.
Submitted by: tegge
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#
132884 |
|
30-Jul-2004 |
dfr |
Fix a memory leak in the device pager which is exposed by the NVIDIA OpenGL driver.
Submitted by: nvidia (possibly also tegge)
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#
130585 |
|
16-Jun-2004 |
phk |
Do the dreaded s/dev_t/struct cdev */ Bump __FreeBSD_version accordingly.
|
#
128570 |
|
23-Apr-2004 |
alc |
Push down Giant into vm_pager_get_pages(). The only get pages methods that require Giant are in the device and vnode pagers.
|
#
127961 |
|
06-Apr-2004 |
imp |
Remove advertising clause from University of California Regent's license, per letter dated July 22, 1999.
Approved by: core
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#
124133 |
|
04-Jan-2004 |
alc |
Simplify the various pager allocation routines by computing the desired object size once and assigning that value to a local variable.
|
#
120824 |
|
05-Oct-2003 |
alc |
The addition of a locking assertion to vm_page_zero_invalid() has revealed a long-time bug: vm_pager_get_pages() assumes that m[reqpage] contains a valid page upon return from pgo_getpages(). In the case of the device pager this page has been freed and replaced by a fake page. The fake page is properly inserted into the vm object but m[reqpage] is left pointing to a freed page. For now, update m[reqpage] to point to the fake page.
Submitted by: tegge
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#
120739 |
|
04-Oct-2003 |
jeff |
- Use the UMA_ZONE_VM flag on the fakepg and object zones to prevent vm recursion and LORs. This may be necessary for other zones created in the vm but this needs to be verified.
|
#
118466 |
|
05-Aug-2003 |
phk |
Use sparse struct initializations for struct pagerops.
This makes grepping for which pagers implement which methods easier.
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#
116793 |
|
24-Jun-2003 |
alc |
Assert that the vm object is locked on entry to dev_pager_getpages().
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#
116279 |
|
13-Jun-2003 |
alc |
Add vm object locking to various pagers' "get pages" methods, i386 stack management functions, and a u area management function.
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#
116226 |
|
11-Jun-2003 |
obrien |
Use __FBSDID().
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#
112569 |
|
24-Mar-2003 |
jake |
- Add vm_paddr_t, a physical address type. This is required for systems where physical addresses larger than virtual addresses, such as i386s with PAE. - Use this to represent physical addresses in the MI vm system and in the i386 pmap code. This also changes the paddr parameter to d_mmap_t. - Fix printf formats to handle physical addresses >4G in the i386 memory detection code, and due to kvtop returning vm_paddr_t instead of u_long.
Note that this is a name change only; vm_paddr_t is still the same as vm_offset_t on all currently supported platforms.
Sponsored by: DARPA, Network Associates Laboratories Discussed with: re, phk (cdevsw change)
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#
111462 |
|
25-Feb-2003 |
mux |
Cleanup of the d_mmap_t interface.
- Get rid of the useless atop() / pmap_phys_address() detour. The device mmap handlers must now give back the physical address without atop()'ing it. - Don't borrow the physical address of the mapping in the returned int. Now we properly pass a vm_offset_t * and expect it to be filled by the mmap handler when the mapping was successful. The mmap handler must now return 0 when successful, any other value is considered as an error. Previously, returning -1 was the only way to fail. This change thus accidentally fixes some devices which were bogusly returning errno constants which would have been considered as addresses by the device pager. - Garbage collect the poorly named pmap_phys_address() now that it's no longer used. - Convert all the d_mmap_t consumers to the new API.
I'm still not sure wheter we need a __FreeBSD_version bump for this, since and we didn't guarantee API/ABI stability until 5.1-RELEASE.
Discussed with: alc, phk, jake Reviewed by: peter Compile-tested on: LINT (i386), GENERIC (alpha and sparc64) Runtime-tested on: i386
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#
111119 |
|
19-Feb-2003 |
imp |
Back out M_* changes, per decision of the TRB.
Approved by: trb
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#
109623 |
|
21-Jan-2003 |
alfred |
Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0. Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.
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#
99849 |
|
12-Jul-2002 |
alc |
o Lock accesses to the page queues.
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#
98824 |
|
25-Jun-2002 |
iedowse |
Complete the initial set of VM changes required to support full 64-bit file sizes. This step simply addresses the remaining overflows, and does attempt to optimise performance. The details are:
o Use a 64-bit type for the vm_object `size' and the size argument to vm_object_allocate(). o Use the correct type for index variables in dev_pager_getpages(), vm_object_page_clean() and vm_object_page_remove(). o Avoid an overflow in the i386 pmap_object_init_pt().
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#
98630 |
|
22-Jun-2002 |
alc |
o Replace mtx_assert(&Giant, MA_OWNED) in dev_pager_alloc() with the acquisition and release of Giant. (Annotate as MPSAFE.) o Reorder the sanity checks in dev_pager_alloc() to reduce the time that Giant is held.
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#
93818 |
|
04-Apr-2002 |
jhb |
Change callers of mtx_init() to pass in an appropriate lock type name. In most cases NULL is passed, but in some cases such as network driver locks (which use the MTX_NETWORK_LOCK macro) and UMA zone locks, a name is used.
Tested on: i386, alpha, sparc64
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#
92748 |
|
20-Mar-2002 |
jeff |
Remove references to vm_zone.h and switch over to the new uma API.
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#
92727 |
|
19-Mar-2002 |
alfred |
Remove __P.
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#
92654 |
|
19-Mar-2002 |
jeff |
This is the first part of the new kernel memory allocator. This replaces malloc(9) and vm_zone with a slab like allocator.
Reviewed by: arch@
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#
79224 |
|
04-Jul-2001 |
dillon |
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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#
77087 |
|
23-May-2001 |
jhb |
Assert Giant is held for the device pager alloc and getpages methods since we call the mmap method of the cdevsw of the device we are mmap'ing.
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#
76166 |
|
01-May-2001 |
markm |
Undo part of the tangle of having sys/lock.h and sys/mutex.h included in other "system" header files.
Also help the deprecation of lockmgr.h by making it a sub-include of sys/lock.h and removing sys/lockmgr.h form kernel .c files.
Sort sys/*.h includes where possible in affected files.
OK'ed by: bde (with reservations)
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#
75675 |
|
18-Apr-2001 |
alfred |
Protect pager object creation with sx locks.
Protect pager object list manipulation with a mutex.
It doesn't look possible to combine them under a single sx lock because creation may block and we can't have the object list manipulation block on anything other than a mutex because of interrupt requests.
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#
58705 |
|
27-Mar-2000 |
charnier |
Revert spelling mistake I made in the previous commit Requested by: Alan and Bruce
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#
58634 |
|
26-Mar-2000 |
charnier |
Spelling
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#
52973 |
|
07-Nov-1999 |
alc |
Remove unused #include's.
Submitted by: phk
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#
52635 |
|
29-Oct-1999 |
phk |
useracc() the prequel:
Merge the contents (less some trivial bordering the silly comments) of <vm/vm_prot.h> and <vm/vm_inherit.h> into <vm/vm.h>. This puts the #defines for the vm_inherit_t and vm_prot_t types next to their typedefs.
This paves the road for the commit to follow shortly: change useracc() to use VM_PROT_{READ|WRITE} rather than B_{READ|WRITE} as argument.
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#
50477 |
|
27-Aug-1999 |
peter |
$Id$ -> $FreeBSD$
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#
47111 |
|
13-May-1999 |
bde |
Casting handles from void * to uintptr_t on the way to dev_t became especially bogus when dev_t became a pointer.
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#
47094 |
|
13-May-1999 |
luoqi |
Device pager's handle is dev_t not udev_t.
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#
47028 |
|
11-May-1999 |
phk |
Divorce "dev_t" from the "major|minor" bitmap, which is now called udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types: major() umajor() minor() uminor() makedev() umakedev() dev2udev() udev2dev()
For now they're functions, they will become in-line functions after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the major/minor number combination, (ie: a potential device: we may not have the driver nor the device), like in inodes, vattr, cdevsw registration and so on, whereas the dev_t appears where we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung directly from the dev_t, along with up to two softc pointers for the device driver and a few houskeeping bits. This will essentially replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the wrong type is being used (dev_t vs udev_t), if you see something not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if it makes a difference. If it does, please try to track it down (many hands make light work) or at least try to reproduce it as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h> files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which means convert BLK's to CHR's at the perimeter of the vnodes and other places where they enter the game (bootdev, mknod, sysctl).
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#
46676 |
|
08-May-1999 |
phk |
I got tired of seeing all the cdevsw[major(foo)] all over the place.
Made a new (inline) function devsw(dev_t dev) and substituted it.
Changed to the BDEV variant to this format as well: bdevsw(dev_t dev)
DEVFS will eventually benefit from this change too.
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#
43129 |
|
24-Jan-1999 |
dillon |
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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#
42957 |
|
21-Jan-1999 |
dillon |
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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#
42408 |
|
08-Jan-1999 |
eivind |
Split DIAGNOSTIC -> DIAGNOSTIC, INVARIANTS, and INVARIANT_SUPPORT as discussed on -hackers.
Introduce 'KASSERT(assertion, ("panic message", args))' for simple check + panic.
Reviewed by: msmith
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#
41591 |
|
07-Dec-1998 |
archie |
The "easy" fixes for compiling the kernel -Wunused: remove unreferenced static and local variables, goto labels, and functions declared but not defined.
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#
41004 |
|
08-Nov-1998 |
dfr |
* Fix a couple of places in the device pager where an address was truncated to 32 bits. * Change the calling convention of the device mmap entry point to pass a vm_offset_t instead of an int for the offset allowing devices with a larger memory map than (1<<32) to be supported on the alpha (/dev/mem is one such).
These changes are required to allow the X server to mmap the various I/O regions used for device port and memory access on the alpha.
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#
40558 |
|
21-Oct-1998 |
dg |
Convert fake page allocs to use the zone allocator, thus eliminating the private pool management code in here.
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#
40557 |
|
21-Oct-1998 |
dg |
Set m->object to NULL in dev_pager_getfake().
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#
40286 |
|
13-Oct-1998 |
dg |
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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#
37649 |
|
15-Jul-1998 |
bde |
Cast pointers to uintptr_t/intptr_t instead of to u_long/long, respectively. Most of the longs should probably have been u_longs, but this changes is just to prevent warnings about casts between pointers and integers of different sizes, not to fix poorly chosen types.
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33134 |
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06-Feb-1998 |
eivind |
Back out DIAGNOSTIC changes.
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33108 |
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04-Feb-1998 |
eivind |
Turn DIAGNOSTIC into a new-style option.
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32937 |
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31-Jan-1998 |
dyson |
Change the busy page mgmt, so that when pages are freed, they MUST be PG_BUSY. It is bogus to free a page that isn't busy, because it is in a state of being "unavailable" when being freed. The additional advantage is that the page_remove code has a better cross-check that the page should be busy and unavailable for other use. There were some minor problems with the collapse code, and this plugs those subtile "holes."
Also, the vfs_bio code wasn't checking correctly for PG_BUSY pages. I am going to develop a more consistant scheme for grabbing pages, busy or otherwise. For now, we are stuck with the current morass.
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28992 |
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01-Sep-1997 |
bde |
Removed unused #includes.
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28751 |
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25-Aug-1997 |
bde |
Fixed type mismatches for functions with args of type vm_prot_t and/or vm_inherit_t. These types are smaller than ints, so the prototypes should have used the promoted type (int) to match the old-style function definitions. They use just vm_prot_t and/or vm_inherit_t. This depends on gcc features to work. I fixed the definitions since this is easiest. The correct fix may be to change the small types to u_int, to optimize for time instead of space.
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22975 |
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22-Feb-1997 |
peter |
Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not ready for it yet.
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21673 |
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14-Jan-1997 |
jkh |
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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15809 |
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18-May-1996 |
dyson |
This set of commits to the VM system does the following, and contain contributions or ideas from Stephen McKay <syssgm@devetir.qld.gov.au>, Alan Cox <alc@cs.rice.edu>, David Greenman <davidg@freebsd.org> and me:
More usage of the TAILQ macros. Additional minor fix to queue.h. Performance enhancements to the pageout daemon. Addition of a wait in the case that the pageout daemon has to run immediately. Slightly modify the pageout algorithm. Significant revamp of the pmap/fork code: 1) PTE's and UPAGES's are NO LONGER in the process's map. 2) PTE's and UPAGES's reside in their own objects. 3) TOTAL elimination of recursive page table pagefaults. 4) The page directory now resides in the PTE object. 5) Implemented pmap_copy, thereby speeding up fork time. 6) Changed the pv entries so that the head is a pointer and not an entire entry. 7) Significant cleanup of pmap_protect, and pmap_remove. 8) Removed significant amounts of machine dependent fork code from vm_glue. Pushed much of that code into the machine dependent pmap module. 9) Support more completely the reuse of already zeroed pages (Page table pages and page directories) as being already zeroed. Performance and code cleanups in vm_map: 1) Improved and simplified allocation of map entries. 2) Improved vm_map_copy code. 3) Corrected some minor problems in the simplify code. Implemented splvm (combo of splbio and splimp.) The VM code now seldom uses splhigh. Improved the speed of and simplified kmem_malloc. Minor mod to vm_fault to avoid using pre-zeroed pages in the case of objects with backing objects along with the already existant condition of having a vnode. (If there is a backing object, there will likely be a COW... With a COW, it isn't necessary to start with a pre-zeroed page.) Minor reorg of source to perhaps improve locality of ref.
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15583 |
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03-May-1996 |
phk |
Another sweep over the pmap/vm macros, this time with more focus on the usage. I'm not satisfied with the naming, but now at least there is less bogus stuff around.
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14430 |
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09-Mar-1996 |
dyson |
Add a missing initialization of the hold_count for device pager ficticiouse pages.
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13490 |
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19-Jan-1996 |
dyson |
Eliminated many redundant vm_map_lookup operations for vm_mmap. Speed up for vfs_bio -- addition of a routine bqrelse to greatly diminish overhead for merged cache. Efficiency improvement for vfs_cluster. It used to do alot of redundant calls to cluster_rbuild. Correct the ordering for vrele of .text and release of credentials. Use the selective tlb update for 486/586/P6. Numerous fixes to the size of objects allocated for files. Additionally, fixes in the various pagers. Fixes for proper positioning of vnode_pager_setsize in msdosfs and ext2fs. Fixes in the swap pager for exhausted resources. The pageout code will not as readily thrash. Change the page queue flags (PG_ACTIVE, PG_INACTIVE, PG_FREE, PG_CACHE) into page queue indices (PQ_ACTIVE, PQ_INACTIVE, PQ_FREE, PQ_CACHE), thereby improving efficiency of several routines. Eliminate even more unnecessary vm_page_protect operations. Significantly speed up process forks. Make vm_object_page_clean more efficient, thereby eliminating the pause that happens every 30seconds. Make sequential clustered writes B_ASYNC instead of B_DELWRI even in the case of filesystems mounted async. Fix a panic with busy pages when write clustering is done for non-VMIO buffers.
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12820 |
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14-Dec-1995 |
phk |
Another mega commit to staticize things.
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12813 |
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13-Dec-1995 |
julian |
devsw tables are now arrays of POINTERS to struct [cb]devsw seems to work hre just fine though I can't check every file that changed due to limmited h/w, however I've checked enught to be petty happy withe hte code..
WARNING... struct lkm[mumble] has changed so it might be an idea to recompile any lkm related programs
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12767 |
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11-Dec-1995 |
dyson |
Changes to support 1Tb filesizes. Pages are now named by an (object,index) pair instead of (object,offset) pair.
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12662 |
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07-Dec-1995 |
dg |
Untangled the vm.h include file spaghetti.
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12610 |
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03-Dec-1995 |
bde |
Fixed the type mismatch in check for the bogus mmap function `nullop'. The test should never succeed and should go away. Temporarily print a warning if it does succeed.
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12591 |
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03-Dec-1995 |
bde |
Completed function declarations and/or added prototypes.
Staticized some functions.
__purified some functions. Some functions were bogusly declared as returning `const'. This hasn't done anything since gcc-2.5. For later versions of gcc, the equivalent is __attribute__((const)) at the end of function declarations.
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12118 |
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05-Nov-1995 |
bde |
Replaced bogus macros for dummy devswitch entries by functions. These functions went away:
enosys (hasn't been used for some time) enxio enodev enoioctl (was used only once, actually for a vop)
if_tun.c: Continued cleaning up...
conf.h: Probably fixed the type of d_reset_t. It is hard to tell the correct type because there are no non-dummy device reset functions.
Removed last vestige of ambiguous sleep message strings.
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9507 |
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13-Jul-1995 |
dg |
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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8876 |
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30-May-1995 |
rgrimes |
Remove trailing whitespace.
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8585 |
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18-May-1995 |
dg |
Accessing pages beyond the end of a mapped file results in internal inconsistencies in the VM system that eventually lead to a panic. These changes fix the behavior to conform to the behavior in SunOS, which is to deny faults to pages beyond the EOF (returning SIGBUS). Internally, this is implemented by requiring faults to be within the object size boundaries. These changes exposed another bug, namely that passing in an offset to mmap when trying to map an unnamed anonymous region also results in internal inconsistencies. In this case, the offset is forced to zero.
Reviewed by: John Dyson and others
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8416 |
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10-May-1995 |
dg |
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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7883 |
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16-Apr-1995 |
dg |
Moved some zero-initialized variables into .bss. Made code intended to be called only from DDB #ifdef DDB. Removed some completely unused globals.
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7007 |
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11-Mar-1995 |
dg |
Clear OBJ_INTERNAL flag for device pager objects and named anonymous objects.
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6585 |
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20-Feb-1995 |
dg |
Deprecated remaining use of vm_deallocate. Deprecated vm_allocate_with_ pager(). Almost completely rewrote vm_mmap(); when John gets done with the bottom half, it will be a complete rewrite. Deprecated most use of vm_object_setpager(). Removed side effect of setting object persist in vm_object_enter and moved this into the pager(s). A few other cosmetic changes.
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5455 |
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09-Jan-1995 |
dg |
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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3311 |
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02-Oct-1994 |
phk |
GCC cleanup. Reviewed by: Submitted by: Obtained from:
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1817 |
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02-Aug-1994 |
dg |
Added $Id$
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1549 |
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25-May-1994 |
rgrimes |
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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1542 |
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24-May-1994 |
rgrimes |
This commit was generated by cvs2svn to compensate for changes in r1541, which included commits to RCS files with non-trunk default branches.
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1541 |
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24-May-1994 |
rgrimes |
BSD 4.4 Lite Kernel Sources
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