dev_pager: define free_page for mgt devices

Callers of cdev_pager_free_page in the kernel always have object->type
== OBJT_MGTDEVICE. Define a function for them to call that skips the
runtime type c

dev_pager: define free_page for mgt devices

Callers of cdev_pager_free_page in the kernel always have object->type
== OBJT_MGTDEVICE. Define a function for them to call that skips the
runtime type check in cdev_pager_free.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D46389

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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 s

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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sys: Remove $FreeBSD$: one-line .h pattern

Remove /^\s*\*+\s*\$FreeBSD\$.*$\n/

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

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.fre

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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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 aft

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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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

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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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://review

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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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

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 th

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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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
Sponsor

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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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: htt

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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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
Different

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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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://review

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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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 FreeBS

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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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 Foundat

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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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_pag

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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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

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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vm: clean up empty lines in .c and .h files

Merge ^/head r358400 through r358465.

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

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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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 dirtie

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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Merge ^/head r351732 through r352104.

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

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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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

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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