uvm(9): Enable swap encryption by default.

For machines where the performance impact of swapping before the
system has an opportunity to process `vm.swap_encrypt=0' in
/etc/sysctl.conf, you can disable it again by adding

options VMSWAP_DEFAULT_PLAINTEXT

to the kernel config.

G/C USE_TOPDOWN_VM. __USE_TOPDOWN_VM is used (and hidden)

uvm(9): Switch from legacy rijndael API to new aes API.

Add missing dependency.

Fixes builds with VM_SWAP but no other users of rijndael crypto code.

Merge from yamt-pagecache (after much testing):

- Reduce unnecessary page scan in putpages esp. when an object has a ton of
pages cached but only a few of them are dirty.

- Reduce the number of pmap operations by tracking page dirtiness more
precisely in uvm layer.

branches: 1.32.2;
Redo the page allocator to perform better, especially on multi-core and
multi-socket systems. Proposed on tech-kern. While here:

- add rudimentary NUMA support - needs more work.
- remove now unused "listq" from vm_page.

Merge from yamt-pagecache:

- do gang lookup of pages using radixtree.
- remove now unused uvm_object::uo_memq and vm_page::listq.queue.

Move all non-emulation-specific coredump code into the coredump module,
and remove all #ifdef COREDUMP conditional compilation. Now, the
coredump module is completely separated from the emulation modules, and
they can all be independently loaded and unloaded.

Welcome to 9.99.18 !

branches: 1.29.2;
Remove emap support. Unfortunately it never got to state where it would be
used and usable, due to reliability and limited & complicated MD support.

Going forward, we need to concentrate on interface which do not map anything
into kernel in first place (such as direct map or KVA-less I/O), rather
than making those mappings cheaper to do.

branches: 1.28.14;
"Make NetBSD great again!"

Introduce uvm_hotplug(9) to the kernel.

Many thanks, in no particular order to:

TNF, for funding the project.

Chuck Silvers - for multiple API reviews and feedback.
Nick Hudson - for testing on multiple architectures and bugfix patches.
Everyone who helped with boot testing.

KeK (http://www.kek.org.in) for hosting the primary developers.

allow the sizes of the maphist and pdhist to be set in the config
file via UVMHIST_MAPHIST_SIZE and UVMHIST_PDHIST_SIZE.

Make UVMHIST_PRINT work again by making it define KERNHIST_PRINT

branches: 1.25.2;
Several changes and improvements in KMEM_GUARD:
- merge uvm_kmguard.{c,h} into subr_kmem.c. It is only user there, and
makes it more consistent. Also, it allows us to enable KMEM_GUARD
without enabling DEBUG.
- rename uvm_kmguard_XXX to kmem_guard_XXX, for consistency
- improve kmem_guard_alloc() so that it supports allocations bigger than
PAGE_SIZE
- remove the canary value, and use directly the kmem header as underflow
pattern.
- fix some comments

(The UAF fifo is disabled for the moment; we actually need to register
the va and its size, and add a weight support not to consume too much
memory.)

UVM_RESERVED_PAGES_PER_CPU must be a param, not a flag.

Allow changing the per-cpu emergency page reservation via kernel config.

branches: 1.22.2;
Use opt_*.h to not polute CPPFLAGS.

Attribute dependency is not yet. Revert a definition.

Define "uvm" attribute and mark files.

branches: 1.20.4; 1.20.14;
fix the ordering and make UVMHIST enable KERNHIST automatically.

branches: 1.19.2;
Make UVM_PAGE_TRKOWN a real flag.

branches: 1.18.2;
rename the va0_disabled option and cpp conditional to "disable" as well,
for consistency, and document option and sysctl flag

Disable mapping of virtual address 0 by user programs per default.
This blocks an easy exploit of kernel bugs leading to dereference
of a NULL pointer on some architectures (eg i386).
The check can be disabled in various ways:
-by CPP definitions in machine/types.h (portmaster's choice)
-by a kernel config option USER_VA0_DISABLED_DEFAULT=0
-at runtime by sysctl vm.user_va0_disabled (cannot be cleared
at securelevel>0)

branches: 1.16.2;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

Add [default] option to make UAREAs swappable. Disabling the option makes
them unswappable and therefore allocatable using KSEG/BAT/etc.

Ephemeral mapping (emap) implementation. Concept is based on the idea that
activity of other threads will perform the TLB flush for the processes using
emap as a side effect. To track that, global and per-CPU generation numbers
are used. This idea was suggested by Andrew Doran; various improvements to
it by me. Notes:

- For now, zero-copy on pipe is not yet enabled.
- TCP socket code would likely need more work.
- Additional UVM loaning improvements are needed.

Proposed on <tech-kern>, silence there.
Quickly reviewed by <ad>.

kernel memory guard for DEBUG kernels, proposed on tech-kern.
See kmem_alloc(9) for details.

branches: 1.12.4;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.11.4; 1.11.6; 1.11.12;
- Switch off the map evcnts by default.
- SAVE_HINT() doesn't need to be atomic.

branches: 1.10.16; 1.10.18; 1.10.20; 1.10.22;
defparam PAGER_MAP_SIZE.

branches: 1.9.6; 1.9.8; 1.9.12;
Add native mremap system call based on the UVM implementation for
Linux compat. Add code to enforce alignment of the new location.
Special thanks to wizd for helping with the man page.

branches: 1.8.8;
PR/34837: Mindaguas: Add SysV SHM dynamic reallocation and locking to the
physical memory

uobj_wirepages and uobj_unwirepages from Mindaugas. PR/34771.
(commented out in files.uvm for now because there is no user in tree.)

http://mail-index.netbsd.org/tech-kern/2006/09/24/0000.html
http://mail-index.netbsd.org/tech-kern/2006/10/10/0000.html

add ubc window hit/miss evcnts.

branches: 1.5.2;
merge yamt-pdpolicy branch.
- separate page replacement policy from the rest of kernel
- implement an alternative replacement policy

branches: 1.4.6; 1.4.16; 1.4.20;
implement compat_linux mremap.

branches: 1.3.2; 1.3.4;
merge yamt-readahead branch.

branches: 1.2.2;
read-ahead statistics.

Move UVM files to files.uvm

G/C USE_TOPDOWN_VM. __USE_TOPDOWN_VM is used (and hidden)

uvm(9): Switch from legacy rijndael API to new aes API.

Add missing dependency.

Fixes builds with VM_SWAP but no other users of rijndael crypto code.

Merge from yamt-pagecache (after much testing):

- Reduce unnecessary page scan in putpages esp. when an object has a ton of
pages cached but only a few of them are dirty.

- Reduce the number of pmap operations by tracking page dirtiness more
precisely in uvm layer.

branches: 1.32.2;
Redo the page allocator to perform better, especially on multi-core and
multi-socket systems. Proposed on tech-kern. While here:

- add rudimentary NUMA support - needs more work.
- remove now unused "listq" from vm_page.

Merge from yamt-pagecache:

- do gang lookup of pages using radixtree.
- remove now unused uvm_object::uo_memq and vm_page::listq.queue.

Move all non-emulation-specific coredump code into the coredump module,
and remove all #ifdef COREDUMP conditional compilation. Now, the
coredump module is completely separated from the emulation modules, and
they can all be independently loaded and unloaded.

Welcome to 9.99.18 !

branches: 1.29.2;
Remove emap support. Unfortunately it never got to state where it would be
used and usable, due to reliability and limited & complicated MD support.

Going forward, we need to concentrate on interface which do not map anything
into kernel in first place (such as direct map or KVA-less I/O), rather
than making those mappings cheaper to do.

branches: 1.28.14;
"Make NetBSD great again!"

Introduce uvm_hotplug(9) to the kernel.

Many thanks, in no particular order to:

TNF, for funding the project.

Chuck Silvers - for multiple API reviews and feedback.
Nick Hudson - for testing on multiple architectures and bugfix patches.
Everyone who helped with boot testing.

KeK (http://www.kek.org.in) for hosting the primary developers.

allow the sizes of the maphist and pdhist to be set in the config
file via UVMHIST_MAPHIST_SIZE and UVMHIST_PDHIST_SIZE.

Make UVMHIST_PRINT work again by making it define KERNHIST_PRINT

branches: 1.25.2;
Several changes and improvements in KMEM_GUARD:
- merge uvm_kmguard.{c,h} into subr_kmem.c. It is only user there, and
makes it more consistent. Also, it allows us to enable KMEM_GUARD
without enabling DEBUG.
- rename uvm_kmguard_XXX to kmem_guard_XXX, for consistency
- improve kmem_guard_alloc() so that it supports allocations bigger than
PAGE_SIZE
- remove the canary value, and use directly the kmem header as underflow
pattern.
- fix some comments

(The UAF fifo is disabled for the moment; we actually need to register
the va and its size, and add a weight support not to consume too much
memory.)

UVM_RESERVED_PAGES_PER_CPU must be a param, not a flag.

Allow changing the per-cpu emergency page reservation via kernel config.

branches: 1.22.2;
Use opt_*.h to not polute CPPFLAGS.

Attribute dependency is not yet. Revert a definition.

Define "uvm" attribute and mark files.

branches: 1.20.4; 1.20.14;
fix the ordering and make UVMHIST enable KERNHIST automatically.

branches: 1.19.2;
Make UVM_PAGE_TRKOWN a real flag.

branches: 1.18.2;
rename the va0_disabled option and cpp conditional to "disable" as well,
for consistency, and document option and sysctl flag

Disable mapping of virtual address 0 by user programs per default.
This blocks an easy exploit of kernel bugs leading to dereference
of a NULL pointer on some architectures (eg i386).
The check can be disabled in various ways:
-by CPP definitions in machine/types.h (portmaster's choice)
-by a kernel config option USER_VA0_DISABLED_DEFAULT=0
-at runtime by sysctl vm.user_va0_disabled (cannot be cleared
at securelevel>0)

branches: 1.16.2;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

Add [default] option to make UAREAs swappable. Disabling the option makes
them unswappable and therefore allocatable using KSEG/BAT/etc.

Ephemeral mapping (emap) implementation. Concept is based on the idea that
activity of other threads will perform the TLB flush for the processes using
emap as a side effect. To track that, global and per-CPU generation numbers
are used. This idea was suggested by Andrew Doran; various improvements to
it by me. Notes:

- For now, zero-copy on pipe is not yet enabled.
- TCP socket code would likely need more work.
- Additional UVM loaning improvements are needed.

Proposed on <tech-kern>, silence there.
Quickly reviewed by <ad>.

kernel memory guard for DEBUG kernels, proposed on tech-kern.
See kmem_alloc(9) for details.

branches: 1.12.4;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.11.4; 1.11.6; 1.11.12;
- Switch off the map evcnts by default.
- SAVE_HINT() doesn't need to be atomic.

branches: 1.10.16; 1.10.18; 1.10.20; 1.10.22;
defparam PAGER_MAP_SIZE.

branches: 1.9.6; 1.9.8; 1.9.12;
Add native mremap system call based on the UVM implementation for
Linux compat. Add code to enforce alignment of the new location.
Special thanks to wizd for helping with the man page.

branches: 1.8.8;
PR/34837: Mindaguas: Add SysV SHM dynamic reallocation and locking to the
physical memory

uobj_wirepages and uobj_unwirepages from Mindaugas. PR/34771.
(commented out in files.uvm for now because there is no user in tree.)

http://mail-index.netbsd.org/tech-kern/2006/09/24/0000.html
http://mail-index.netbsd.org/tech-kern/2006/10/10/0000.html

add ubc window hit/miss evcnts.

branches: 1.5.2;
merge yamt-pdpolicy branch.
- separate page replacement policy from the rest of kernel
- implement an alternative replacement policy

branches: 1.4.6; 1.4.16; 1.4.20;
implement compat_linux mremap.

branches: 1.3.2; 1.3.4;
merge yamt-readahead branch.

branches: 1.2.2;
read-ahead statistics.

Move UVM files to files.uvm

uvm(9): Switch from legacy rijndael API to new aes API.

Add missing dependency.

Fixes builds with VM_SWAP but no other users of rijndael crypto code.

Merge from yamt-pagecache (after much testing):

- Reduce unnecessary page scan in putpages esp. when an object has a ton of
pages cached but only a few of them are dirty.

- Reduce the number of pmap operations by tracking page dirtiness more
precisely in uvm layer.

branches: 1.32.2;
Redo the page allocator to perform better, especially on multi-core and
multi-socket systems. Proposed on tech-kern. While here:

- add rudimentary NUMA support - needs more work.
- remove now unused "listq" from vm_page.

Merge from yamt-pagecache:

- do gang lookup of pages using radixtree.
- remove now unused uvm_object::uo_memq and vm_page::listq.queue.

Move all non-emulation-specific coredump code into the coredump module,
and remove all #ifdef COREDUMP conditional compilation. Now, the
coredump module is completely separated from the emulation modules, and
they can all be independently loaded and unloaded.

Welcome to 9.99.18 !

branches: 1.29.2;
Remove emap support. Unfortunately it never got to state where it would be
used and usable, due to reliability and limited & complicated MD support.

Going forward, we need to concentrate on interface which do not map anything
into kernel in first place (such as direct map or KVA-less I/O), rather
than making those mappings cheaper to do.

branches: 1.28.14;
"Make NetBSD great again!"

Introduce uvm_hotplug(9) to the kernel.

Many thanks, in no particular order to:

TNF, for funding the project.

Chuck Silvers - for multiple API reviews and feedback.
Nick Hudson - for testing on multiple architectures and bugfix patches.
Everyone who helped with boot testing.

KeK (http://www.kek.org.in) for hosting the primary developers.

allow the sizes of the maphist and pdhist to be set in the config
file via UVMHIST_MAPHIST_SIZE and UVMHIST_PDHIST_SIZE.

Make UVMHIST_PRINT work again by making it define KERNHIST_PRINT

branches: 1.25.2;
Several changes and improvements in KMEM_GUARD:
- merge uvm_kmguard.{c,h} into subr_kmem.c. It is only user there, and
makes it more consistent. Also, it allows us to enable KMEM_GUARD
without enabling DEBUG.
- rename uvm_kmguard_XXX to kmem_guard_XXX, for consistency
- improve kmem_guard_alloc() so that it supports allocations bigger than
PAGE_SIZE
- remove the canary value, and use directly the kmem header as underflow
pattern.
- fix some comments

(The UAF fifo is disabled for the moment; we actually need to register
the va and its size, and add a weight support not to consume too much
memory.)

UVM_RESERVED_PAGES_PER_CPU must be a param, not a flag.

Allow changing the per-cpu emergency page reservation via kernel config.

branches: 1.22.2;
Use opt_*.h to not polute CPPFLAGS.

Attribute dependency is not yet. Revert a definition.

Define "uvm" attribute and mark files.

branches: 1.20.4; 1.20.14;
fix the ordering and make UVMHIST enable KERNHIST automatically.

branches: 1.19.2;
Make UVM_PAGE_TRKOWN a real flag.

branches: 1.18.2;
rename the va0_disabled option and cpp conditional to "disable" as well,
for consistency, and document option and sysctl flag

Disable mapping of virtual address 0 by user programs per default.
This blocks an easy exploit of kernel bugs leading to dereference
of a NULL pointer on some architectures (eg i386).
The check can be disabled in various ways:
-by CPP definitions in machine/types.h (portmaster's choice)
-by a kernel config option USER_VA0_DISABLED_DEFAULT=0
-at runtime by sysctl vm.user_va0_disabled (cannot be cleared
at securelevel>0)

branches: 1.16.2;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

Add [default] option to make UAREAs swappable. Disabling the option makes
them unswappable and therefore allocatable using KSEG/BAT/etc.

Ephemeral mapping (emap) implementation. Concept is based on the idea that
activity of other threads will perform the TLB flush for the processes using
emap as a side effect. To track that, global and per-CPU generation numbers
are used. This idea was suggested by Andrew Doran; various improvements to
it by me. Notes:

- For now, zero-copy on pipe is not yet enabled.
- TCP socket code would likely need more work.
- Additional UVM loaning improvements are needed.

Proposed on <tech-kern>, silence there.
Quickly reviewed by <ad>.

kernel memory guard for DEBUG kernels, proposed on tech-kern.
See kmem_alloc(9) for details.

branches: 1.12.4;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.11.4; 1.11.6; 1.11.12;
- Switch off the map evcnts by default.
- SAVE_HINT() doesn't need to be atomic.

branches: 1.10.16; 1.10.18; 1.10.20; 1.10.22;
defparam PAGER_MAP_SIZE.

branches: 1.9.6; 1.9.8; 1.9.12;
Add native mremap system call based on the UVM implementation for
Linux compat. Add code to enforce alignment of the new location.
Special thanks to wizd for helping with the man page.

branches: 1.8.8;
PR/34837: Mindaguas: Add SysV SHM dynamic reallocation and locking to the
physical memory

uobj_wirepages and uobj_unwirepages from Mindaugas. PR/34771.
(commented out in files.uvm for now because there is no user in tree.)

http://mail-index.netbsd.org/tech-kern/2006/09/24/0000.html
http://mail-index.netbsd.org/tech-kern/2006/10/10/0000.html

add ubc window hit/miss evcnts.

branches: 1.5.2;
merge yamt-pdpolicy branch.
- separate page replacement policy from the rest of kernel
- implement an alternative replacement policy

branches: 1.4.6; 1.4.16; 1.4.20;
implement compat_linux mremap.

branches: 1.3.2; 1.3.4;
merge yamt-readahead branch.

branches: 1.2.2;
read-ahead statistics.

Move UVM files to files.uvm

Add missing dependency.

Fixes builds with VM_SWAP but no other users of rijndael crypto code.

Merge from yamt-pagecache (after much testing):

- Reduce unnecessary page scan in putpages esp. when an object has a ton of
pages cached but only a few of them are dirty.

- Reduce the number of pmap operations by tracking page dirtiness more
precisely in uvm layer.

branches: 1.32.2;
Redo the page allocator to perform better, especially on multi-core and
multi-socket systems. Proposed on tech-kern. While here:

- add rudimentary NUMA support - needs more work.
- remove now unused "listq" from vm_page.

Merge from yamt-pagecache:

- do gang lookup of pages using radixtree.
- remove now unused uvm_object::uo_memq and vm_page::listq.queue.

Move all non-emulation-specific coredump code into the coredump module,
and remove all #ifdef COREDUMP conditional compilation. Now, the
coredump module is completely separated from the emulation modules, and
they can all be independently loaded and unloaded.

Welcome to 9.99.18 !

branches: 1.29.2;
Remove emap support. Unfortunately it never got to state where it would be
used and usable, due to reliability and limited & complicated MD support.

Going forward, we need to concentrate on interface which do not map anything
into kernel in first place (such as direct map or KVA-less I/O), rather
than making those mappings cheaper to do.

branches: 1.28.14;
"Make NetBSD great again!"

Introduce uvm_hotplug(9) to the kernel.

Many thanks, in no particular order to:

TNF, for funding the project.

Chuck Silvers - for multiple API reviews and feedback.
Nick Hudson - for testing on multiple architectures and bugfix patches.
Everyone who helped with boot testing.

KeK (http://www.kek.org.in) for hosting the primary developers.

allow the sizes of the maphist and pdhist to be set in the config
file via UVMHIST_MAPHIST_SIZE and UVMHIST_PDHIST_SIZE.

Make UVMHIST_PRINT work again by making it define KERNHIST_PRINT

branches: 1.25.2;
Several changes and improvements in KMEM_GUARD:
- merge uvm_kmguard.{c,h} into subr_kmem.c. It is only user there, and
makes it more consistent. Also, it allows us to enable KMEM_GUARD
without enabling DEBUG.
- rename uvm_kmguard_XXX to kmem_guard_XXX, for consistency
- improve kmem_guard_alloc() so that it supports allocations bigger than
PAGE_SIZE
- remove the canary value, and use directly the kmem header as underflow
pattern.
- fix some comments

(The UAF fifo is disabled for the moment; we actually need to register
the va and its size, and add a weight support not to consume too much
memory.)

UVM_RESERVED_PAGES_PER_CPU must be a param, not a flag.

Allow changing the per-cpu emergency page reservation via kernel config.

branches: 1.22.2;
Use opt_*.h to not polute CPPFLAGS.

Attribute dependency is not yet. Revert a definition.

Define "uvm" attribute and mark files.

branches: 1.20.4; 1.20.14;
fix the ordering and make UVMHIST enable KERNHIST automatically.

branches: 1.19.2;
Make UVM_PAGE_TRKOWN a real flag.

branches: 1.18.2;
rename the va0_disabled option and cpp conditional to "disable" as well,
for consistency, and document option and sysctl flag

Disable mapping of virtual address 0 by user programs per default.
This blocks an easy exploit of kernel bugs leading to dereference
of a NULL pointer on some architectures (eg i386).
The check can be disabled in various ways:
-by CPP definitions in machine/types.h (portmaster's choice)
-by a kernel config option USER_VA0_DISABLED_DEFAULT=0
-at runtime by sysctl vm.user_va0_disabled (cannot be cleared
at securelevel>0)

branches: 1.16.2;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

Add [default] option to make UAREAs swappable. Disabling the option makes
them unswappable and therefore allocatable using KSEG/BAT/etc.

Ephemeral mapping (emap) implementation. Concept is based on the idea that
activity of other threads will perform the TLB flush for the processes using
emap as a side effect. To track that, global and per-CPU generation numbers
are used. This idea was suggested by Andrew Doran; various improvements to
it by me. Notes:

- For now, zero-copy on pipe is not yet enabled.
- TCP socket code would likely need more work.
- Additional UVM loaning improvements are needed.

Proposed on <tech-kern>, silence there.
Quickly reviewed by <ad>.

kernel memory guard for DEBUG kernels, proposed on tech-kern.
See kmem_alloc(9) for details.

branches: 1.12.4;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.11.4; 1.11.6; 1.11.12;
- Switch off the map evcnts by default.
- SAVE_HINT() doesn't need to be atomic.

branches: 1.10.16; 1.10.18; 1.10.20; 1.10.22;
defparam PAGER_MAP_SIZE.

branches: 1.9.6; 1.9.8; 1.9.12;
Add native mremap system call based on the UVM implementation for
Linux compat. Add code to enforce alignment of the new location.
Special thanks to wizd for helping with the man page.

branches: 1.8.8;
PR/34837: Mindaguas: Add SysV SHM dynamic reallocation and locking to the
physical memory

uobj_wirepages and uobj_unwirepages from Mindaugas. PR/34771.
(commented out in files.uvm for now because there is no user in tree.)

http://mail-index.netbsd.org/tech-kern/2006/09/24/0000.html
http://mail-index.netbsd.org/tech-kern/2006/10/10/0000.html

add ubc window hit/miss evcnts.

branches: 1.5.2;
merge yamt-pdpolicy branch.
- separate page replacement policy from the rest of kernel
- implement an alternative replacement policy

branches: 1.4.6; 1.4.16; 1.4.20;
implement compat_linux mremap.

branches: 1.3.2; 1.3.4;
merge yamt-readahead branch.

branches: 1.2.2;
read-ahead statistics.

Move UVM files to files.uvm

Merge from yamt-pagecache (after much testing):

- Reduce unnecessary page scan in putpages esp. when an object has a ton of
pages cached but only a few of them are dirty.

- Reduce the number of pmap operations by tracking page dirtiness more
precisely in uvm layer.

Redo the page allocator to perform better, especially on multi-core and
multi-socket systems. Proposed on tech-kern. While here:

- add rudimentary NUMA support - needs more work.
- remove now unused "listq" from vm_page.

Merge from yamt-pagecache:

- do gang lookup of pages using radixtree.
- remove now unused uvm_object::uo_memq and vm_page::listq.queue.

Move all non-emulation-specific coredump code into the coredump module,
and remove all #ifdef COREDUMP conditional compilation. Now, the
coredump module is completely separated from the emulation modules, and
they can all be independently loaded and unloaded.

Welcome to 9.99.18 !

Remove emap support. Unfortunately it never got to state where it would be
used and usable, due to reliability and limited & complicated MD support.

Going forward, we need to concentrate on interface which do not map anything
into kernel in first place (such as direct map or KVA-less I/O), rather
than making those mappings cheaper to do.

branches: 1.28.14;
"Make NetBSD great again!"

Introduce uvm_hotplug(9) to the kernel.

Many thanks, in no particular order to:

TNF, for funding the project.

Chuck Silvers - for multiple API reviews and feedback.
Nick Hudson - for testing on multiple architectures and bugfix patches.
Everyone who helped with boot testing.

KeK (http://www.kek.org.in) for hosting the primary developers.

allow the sizes of the maphist and pdhist to be set in the config
file via UVMHIST_MAPHIST_SIZE and UVMHIST_PDHIST_SIZE.

Make UVMHIST_PRINT work again by making it define KERNHIST_PRINT

branches: 1.25.2;
Several changes and improvements in KMEM_GUARD:
- merge uvm_kmguard.{c,h} into subr_kmem.c. It is only user there, and
makes it more consistent. Also, it allows us to enable KMEM_GUARD
without enabling DEBUG.
- rename uvm_kmguard_XXX to kmem_guard_XXX, for consistency
- improve kmem_guard_alloc() so that it supports allocations bigger than
PAGE_SIZE
- remove the canary value, and use directly the kmem header as underflow
pattern.
- fix some comments

(The UAF fifo is disabled for the moment; we actually need to register
the va and its size, and add a weight support not to consume too much
memory.)

UVM_RESERVED_PAGES_PER_CPU must be a param, not a flag.

Allow changing the per-cpu emergency page reservation via kernel config.

branches: 1.22.2;
Use opt_*.h to not polute CPPFLAGS.

Attribute dependency is not yet. Revert a definition.

Define "uvm" attribute and mark files.

branches: 1.20.4; 1.20.14;
fix the ordering and make UVMHIST enable KERNHIST automatically.

branches: 1.19.2;
Make UVM_PAGE_TRKOWN a real flag.

branches: 1.18.2;
rename the va0_disabled option and cpp conditional to "disable" as well,
for consistency, and document option and sysctl flag

Disable mapping of virtual address 0 by user programs per default.
This blocks an easy exploit of kernel bugs leading to dereference
of a NULL pointer on some architectures (eg i386).
The check can be disabled in various ways:
-by CPP definitions in machine/types.h (portmaster's choice)
-by a kernel config option USER_VA0_DISABLED_DEFAULT=0
-at runtime by sysctl vm.user_va0_disabled (cannot be cleared
at securelevel>0)

branches: 1.16.2;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

Add [default] option to make UAREAs swappable. Disabling the option makes
them unswappable and therefore allocatable using KSEG/BAT/etc.

Ephemeral mapping (emap) implementation. Concept is based on the idea that
activity of other threads will perform the TLB flush for the processes using
emap as a side effect. To track that, global and per-CPU generation numbers
are used. This idea was suggested by Andrew Doran; various improvements to
it by me. Notes:

- For now, zero-copy on pipe is not yet enabled.
- TCP socket code would likely need more work.
- Additional UVM loaning improvements are needed.

Proposed on <tech-kern>, silence there.
Quickly reviewed by <ad>.

kernel memory guard for DEBUG kernels, proposed on tech-kern.
See kmem_alloc(9) for details.

branches: 1.12.4;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.11.4; 1.11.6; 1.11.12;
- Switch off the map evcnts by default.
- SAVE_HINT() doesn't need to be atomic.

branches: 1.10.16; 1.10.18; 1.10.20; 1.10.22;
defparam PAGER_MAP_SIZE.

branches: 1.9.6; 1.9.8; 1.9.12;
Add native mremap system call based on the UVM implementation for
Linux compat. Add code to enforce alignment of the new location.
Special thanks to wizd for helping with the man page.

branches: 1.8.8;
PR/34837: Mindaguas: Add SysV SHM dynamic reallocation and locking to the
physical memory

uobj_wirepages and uobj_unwirepages from Mindaugas. PR/34771.
(commented out in files.uvm for now because there is no user in tree.)

http://mail-index.netbsd.org/tech-kern/2006/09/24/0000.html
http://mail-index.netbsd.org/tech-kern/2006/10/10/0000.html

add ubc window hit/miss evcnts.

branches: 1.5.2;
merge yamt-pdpolicy branch.
- separate page replacement policy from the rest of kernel
- implement an alternative replacement policy

branches: 1.4.6; 1.4.16; 1.4.20;
implement compat_linux mremap.

branches: 1.3.2; 1.3.4;
merge yamt-readahead branch.

branches: 1.2.2;
read-ahead statistics.

Move UVM files to files.uvm

Redo the page allocator to perform better, especially on multi-core and
multi-socket systems. Proposed on tech-kern. While here:

- add rudimentary NUMA support - needs more work.
- remove now unused "listq" from vm_page.

Merge from yamt-pagecache:

- do gang lookup of pages using radixtree.
- remove now unused uvm_object::uo_memq and vm_page::listq.queue.

Move all non-emulation-specific coredump code into the coredump module,
and remove all #ifdef COREDUMP conditional compilation. Now, the
coredump module is completely separated from the emulation modules, and
they can all be independently loaded and unloaded.

Welcome to 9.99.18 !

Remove emap support. Unfortunately it never got to state where it would be
used and usable, due to reliability and limited & complicated MD support.

Going forward, we need to concentrate on interface which do not map anything
into kernel in first place (such as direct map or KVA-less I/O), rather
than making those mappings cheaper to do.

branches: 1.28.14;
"Make NetBSD great again!"

Introduce uvm_hotplug(9) to the kernel.

Many thanks, in no particular order to:

TNF, for funding the project.

Chuck Silvers - for multiple API reviews and feedback.
Nick Hudson - for testing on multiple architectures and bugfix patches.
Everyone who helped with boot testing.

KeK (http://www.kek.org.in) for hosting the primary developers.

allow the sizes of the maphist and pdhist to be set in the config
file via UVMHIST_MAPHIST_SIZE and UVMHIST_PDHIST_SIZE.

Make UVMHIST_PRINT work again by making it define KERNHIST_PRINT

branches: 1.25.2;
Several changes and improvements in KMEM_GUARD:
- merge uvm_kmguard.{c,h} into subr_kmem.c. It is only user there, and
makes it more consistent. Also, it allows us to enable KMEM_GUARD
without enabling DEBUG.
- rename uvm_kmguard_XXX to kmem_guard_XXX, for consistency
- improve kmem_guard_alloc() so that it supports allocations bigger than
PAGE_SIZE
- remove the canary value, and use directly the kmem header as underflow
pattern.
- fix some comments

(The UAF fifo is disabled for the moment; we actually need to register
the va and its size, and add a weight support not to consume too much
memory.)

UVM_RESERVED_PAGES_PER_CPU must be a param, not a flag.

Allow changing the per-cpu emergency page reservation via kernel config.

branches: 1.22.2;
Use opt_*.h to not polute CPPFLAGS.

Attribute dependency is not yet. Revert a definition.

Define "uvm" attribute and mark files.

branches: 1.20.4; 1.20.14;
fix the ordering and make UVMHIST enable KERNHIST automatically.

branches: 1.19.2;
Make UVM_PAGE_TRKOWN a real flag.

branches: 1.18.2;
rename the va0_disabled option and cpp conditional to "disable" as well,
for consistency, and document option and sysctl flag

Disable mapping of virtual address 0 by user programs per default.
This blocks an easy exploit of kernel bugs leading to dereference
of a NULL pointer on some architectures (eg i386).
The check can be disabled in various ways:
-by CPP definitions in machine/types.h (portmaster's choice)
-by a kernel config option USER_VA0_DISABLED_DEFAULT=0
-at runtime by sysctl vm.user_va0_disabled (cannot be cleared
at securelevel>0)

branches: 1.16.2;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

Add [default] option to make UAREAs swappable. Disabling the option makes
them unswappable and therefore allocatable using KSEG/BAT/etc.

Ephemeral mapping (emap) implementation. Concept is based on the idea that
activity of other threads will perform the TLB flush for the processes using
emap as a side effect. To track that, global and per-CPU generation numbers
are used. This idea was suggested by Andrew Doran; various improvements to
it by me. Notes:

- For now, zero-copy on pipe is not yet enabled.
- TCP socket code would likely need more work.
- Additional UVM loaning improvements are needed.

Proposed on <tech-kern>, silence there.
Quickly reviewed by <ad>.

kernel memory guard for DEBUG kernels, proposed on tech-kern.
See kmem_alloc(9) for details.

branches: 1.12.4;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.11.4; 1.11.6; 1.11.12;
- Switch off the map evcnts by default.
- SAVE_HINT() doesn't need to be atomic.

branches: 1.10.16; 1.10.18; 1.10.20; 1.10.22;
defparam PAGER_MAP_SIZE.

branches: 1.9.6; 1.9.8; 1.9.12;
Add native mremap system call based on the UVM implementation for
Linux compat. Add code to enforce alignment of the new location.
Special thanks to wizd for helping with the man page.

branches: 1.8.8;
PR/34837: Mindaguas: Add SysV SHM dynamic reallocation and locking to the
physical memory

uobj_wirepages and uobj_unwirepages from Mindaugas. PR/34771.
(commented out in files.uvm for now because there is no user in tree.)

http://mail-index.netbsd.org/tech-kern/2006/09/24/0000.html
http://mail-index.netbsd.org/tech-kern/2006/10/10/0000.html

add ubc window hit/miss evcnts.

branches: 1.5.2;
merge yamt-pdpolicy branch.
- separate page replacement policy from the rest of kernel
- implement an alternative replacement policy

branches: 1.4.6; 1.4.16; 1.4.20;
implement compat_linux mremap.

branches: 1.3.2; 1.3.4;
merge yamt-readahead branch.

branches: 1.2.2;
read-ahead statistics.

Move UVM files to files.uvm

Merge from yamt-pagecache:

- do gang lookup of pages using radixtree.
- remove now unused uvm_object::uo_memq and vm_page::listq.queue.

Move all non-emulation-specific coredump code into the coredump module,
and remove all #ifdef COREDUMP conditional compilation. Now, the
coredump module is completely separated from the emulation modules, and
they can all be independently loaded and unloaded.

Welcome to 9.99.18 !

Remove emap support. Unfortunately it never got to state where it would be
used and usable, due to reliability and limited & complicated MD support.

Going forward, we need to concentrate on interface which do not map anything
into kernel in first place (such as direct map or KVA-less I/O), rather
than making those mappings cheaper to do.

branches: 1.28.14;
"Make NetBSD great again!"

Introduce uvm_hotplug(9) to the kernel.

Many thanks, in no particular order to:

TNF, for funding the project.

Chuck Silvers - for multiple API reviews and feedback.
Nick Hudson - for testing on multiple architectures and bugfix patches.
Everyone who helped with boot testing.

KeK (http://www.kek.org.in) for hosting the primary developers.

allow the sizes of the maphist and pdhist to be set in the config
file via UVMHIST_MAPHIST_SIZE and UVMHIST_PDHIST_SIZE.

Make UVMHIST_PRINT work again by making it define KERNHIST_PRINT

branches: 1.25.2;
Several changes and improvements in KMEM_GUARD:
- merge uvm_kmguard.{c,h} into subr_kmem.c. It is only user there, and
makes it more consistent. Also, it allows us to enable KMEM_GUARD
without enabling DEBUG.
- rename uvm_kmguard_XXX to kmem_guard_XXX, for consistency
- improve kmem_guard_alloc() so that it supports allocations bigger than
PAGE_SIZE
- remove the canary value, and use directly the kmem header as underflow
pattern.
- fix some comments

(The UAF fifo is disabled for the moment; we actually need to register
the va and its size, and add a weight support not to consume too much
memory.)

UVM_RESERVED_PAGES_PER_CPU must be a param, not a flag.

Allow changing the per-cpu emergency page reservation via kernel config.

branches: 1.22.2;
Use opt_*.h to not polute CPPFLAGS.

Attribute dependency is not yet. Revert a definition.

Define "uvm" attribute and mark files.

branches: 1.20.4; 1.20.14;
fix the ordering and make UVMHIST enable KERNHIST automatically.

branches: 1.19.2;
Make UVM_PAGE_TRKOWN a real flag.

branches: 1.18.2;
rename the va0_disabled option and cpp conditional to "disable" as well,
for consistency, and document option and sysctl flag

Disable mapping of virtual address 0 by user programs per default.
This blocks an easy exploit of kernel bugs leading to dereference
of a NULL pointer on some architectures (eg i386).
The check can be disabled in various ways:
-by CPP definitions in machine/types.h (portmaster's choice)
-by a kernel config option USER_VA0_DISABLED_DEFAULT=0
-at runtime by sysctl vm.user_va0_disabled (cannot be cleared
at securelevel>0)

branches: 1.16.2;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

Add [default] option to make UAREAs swappable. Disabling the option makes
them unswappable and therefore allocatable using KSEG/BAT/etc.

Ephemeral mapping (emap) implementation. Concept is based on the idea that
activity of other threads will perform the TLB flush for the processes using
emap as a side effect. To track that, global and per-CPU generation numbers
are used. This idea was suggested by Andrew Doran; various improvements to
it by me. Notes:

- For now, zero-copy on pipe is not yet enabled.
- TCP socket code would likely need more work.
- Additional UVM loaning improvements are needed.

Proposed on <tech-kern>, silence there.
Quickly reviewed by <ad>.

kernel memory guard for DEBUG kernels, proposed on tech-kern.
See kmem_alloc(9) for details.

branches: 1.12.4;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.11.4; 1.11.6; 1.11.12;
- Switch off the map evcnts by default.
- SAVE_HINT() doesn't need to be atomic.

branches: 1.10.16; 1.10.18; 1.10.20; 1.10.22;
defparam PAGER_MAP_SIZE.

branches: 1.9.6; 1.9.8; 1.9.12;
Add native mremap system call based on the UVM implementation for
Linux compat. Add code to enforce alignment of the new location.
Special thanks to wizd for helping with the man page.

branches: 1.8.8;
PR/34837: Mindaguas: Add SysV SHM dynamic reallocation and locking to the
physical memory

uobj_wirepages and uobj_unwirepages from Mindaugas. PR/34771.
(commented out in files.uvm for now because there is no user in tree.)

http://mail-index.netbsd.org/tech-kern/2006/09/24/0000.html
http://mail-index.netbsd.org/tech-kern/2006/10/10/0000.html

add ubc window hit/miss evcnts.

branches: 1.5.2;
merge yamt-pdpolicy branch.
- separate page replacement policy from the rest of kernel
- implement an alternative replacement policy

branches: 1.4.6; 1.4.16; 1.4.20;
implement compat_linux mremap.

branches: 1.3.2; 1.3.4;
merge yamt-readahead branch.

branches: 1.2.2;
read-ahead statistics.

Move UVM files to files.uvm

Move all non-emulation-specific coredump code into the coredump module,
and remove all #ifdef COREDUMP conditional compilation. Now, the
coredump module is completely separated from the emulation modules, and
they can all be independently loaded and unloaded.

Welcome to 9.99.18 !

Remove emap support. Unfortunately it never got to state where it would be
used and usable, due to reliability and limited & complicated MD support.

Going forward, we need to concentrate on interface which do not map anything
into kernel in first place (such as direct map or KVA-less I/O), rather
than making those mappings cheaper to do.

branches: 1.28.14;
"Make NetBSD great again!"

Introduce uvm_hotplug(9) to the kernel.

Many thanks, in no particular order to:

TNF, for funding the project.

Chuck Silvers - for multiple API reviews and feedback.
Nick Hudson - for testing on multiple architectures and bugfix patches.
Everyone who helped with boot testing.

KeK (http://www.kek.org.in) for hosting the primary developers.

allow the sizes of the maphist and pdhist to be set in the config
file via UVMHIST_MAPHIST_SIZE and UVMHIST_PDHIST_SIZE.

Make UVMHIST_PRINT work again by making it define KERNHIST_PRINT

branches: 1.25.2;
Several changes and improvements in KMEM_GUARD:
- merge uvm_kmguard.{c,h} into subr_kmem.c. It is only user there, and
makes it more consistent. Also, it allows us to enable KMEM_GUARD
without enabling DEBUG.
- rename uvm_kmguard_XXX to kmem_guard_XXX, for consistency
- improve kmem_guard_alloc() so that it supports allocations bigger than
PAGE_SIZE
- remove the canary value, and use directly the kmem header as underflow
pattern.
- fix some comments

(The UAF fifo is disabled for the moment; we actually need to register
the va and its size, and add a weight support not to consume too much
memory.)

UVM_RESERVED_PAGES_PER_CPU must be a param, not a flag.

Allow changing the per-cpu emergency page reservation via kernel config.

branches: 1.22.2;
Use opt_*.h to not polute CPPFLAGS.

Attribute dependency is not yet. Revert a definition.

Define "uvm" attribute and mark files.

branches: 1.20.4; 1.20.14;
fix the ordering and make UVMHIST enable KERNHIST automatically.

branches: 1.19.2;
Make UVM_PAGE_TRKOWN a real flag.

branches: 1.18.2;
rename the va0_disabled option and cpp conditional to "disable" as well,
for consistency, and document option and sysctl flag

Disable mapping of virtual address 0 by user programs per default.
This blocks an easy exploit of kernel bugs leading to dereference
of a NULL pointer on some architectures (eg i386).
The check can be disabled in various ways:
-by CPP definitions in machine/types.h (portmaster's choice)
-by a kernel config option USER_VA0_DISABLED_DEFAULT=0
-at runtime by sysctl vm.user_va0_disabled (cannot be cleared
at securelevel>0)

branches: 1.16.2;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

Add [default] option to make UAREAs swappable. Disabling the option makes
them unswappable and therefore allocatable using KSEG/BAT/etc.

Ephemeral mapping (emap) implementation. Concept is based on the idea that
activity of other threads will perform the TLB flush for the processes using
emap as a side effect. To track that, global and per-CPU generation numbers
are used. This idea was suggested by Andrew Doran; various improvements to
it by me. Notes:

- For now, zero-copy on pipe is not yet enabled.
- TCP socket code would likely need more work.
- Additional UVM loaning improvements are needed.

Proposed on <tech-kern>, silence there.
Quickly reviewed by <ad>.

kernel memory guard for DEBUG kernels, proposed on tech-kern.
See kmem_alloc(9) for details.

branches: 1.12.4;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.11.4; 1.11.6; 1.11.12;
- Switch off the map evcnts by default.
- SAVE_HINT() doesn't need to be atomic.

branches: 1.10.16; 1.10.18; 1.10.20; 1.10.22;
defparam PAGER_MAP_SIZE.

branches: 1.9.6; 1.9.8; 1.9.12;
Add native mremap system call based on the UVM implementation for
Linux compat. Add code to enforce alignment of the new location.
Special thanks to wizd for helping with the man page.

branches: 1.8.8;
PR/34837: Mindaguas: Add SysV SHM dynamic reallocation and locking to the
physical memory

uobj_wirepages and uobj_unwirepages from Mindaugas. PR/34771.
(commented out in files.uvm for now because there is no user in tree.)

http://mail-index.netbsd.org/tech-kern/2006/09/24/0000.html
http://mail-index.netbsd.org/tech-kern/2006/10/10/0000.html

add ubc window hit/miss evcnts.

branches: 1.5.2;
merge yamt-pdpolicy branch.
- separate page replacement policy from the rest of kernel
- implement an alternative replacement policy

branches: 1.4.6; 1.4.16; 1.4.20;
implement compat_linux mremap.

branches: 1.3.2; 1.3.4;
merge yamt-readahead branch.

branches: 1.2.2;
read-ahead statistics.

Move UVM files to files.uvm

Remove emap support. Unfortunately it never got to state where it would be
used and usable, due to reliability and limited & complicated MD support.

Going forward, we need to concentrate on interface which do not map anything
into kernel in first place (such as direct map or KVA-less I/O), rather
than making those mappings cheaper to do.

branches: 1.28.14;
"Make NetBSD great again!"

Introduce uvm_hotplug(9) to the kernel.

Many thanks, in no particular order to:

TNF, for funding the project.

Chuck Silvers - for multiple API reviews and feedback.
Nick Hudson - for testing on multiple architectures and bugfix patches.
Everyone who helped with boot testing.

KeK (http://www.kek.org.in) for hosting the primary developers.

allow the sizes of the maphist and pdhist to be set in the config
file via UVMHIST_MAPHIST_SIZE and UVMHIST_PDHIST_SIZE.

Make UVMHIST_PRINT work again by making it define KERNHIST_PRINT

branches: 1.25.2;
Several changes and improvements in KMEM_GUARD:
- merge uvm_kmguard.{c,h} into subr_kmem.c. It is only user there, and
makes it more consistent. Also, it allows us to enable KMEM_GUARD
without enabling DEBUG.
- rename uvm_kmguard_XXX to kmem_guard_XXX, for consistency
- improve kmem_guard_alloc() so that it supports allocations bigger than
PAGE_SIZE
- remove the canary value, and use directly the kmem header as underflow
pattern.
- fix some comments

(The UAF fifo is disabled for the moment; we actually need to register
the va and its size, and add a weight support not to consume too much
memory.)

UVM_RESERVED_PAGES_PER_CPU must be a param, not a flag.

Allow changing the per-cpu emergency page reservation via kernel config.

branches: 1.22.2;
Use opt_*.h to not polute CPPFLAGS.

Attribute dependency is not yet. Revert a definition.

Define "uvm" attribute and mark files.

branches: 1.20.4; 1.20.14;
fix the ordering and make UVMHIST enable KERNHIST automatically.

branches: 1.19.2;
Make UVM_PAGE_TRKOWN a real flag.

branches: 1.18.2;
rename the va0_disabled option and cpp conditional to "disable" as well,
for consistency, and document option and sysctl flag

Disable mapping of virtual address 0 by user programs per default.
This blocks an easy exploit of kernel bugs leading to dereference
of a NULL pointer on some architectures (eg i386).
The check can be disabled in various ways:
-by CPP definitions in machine/types.h (portmaster's choice)
-by a kernel config option USER_VA0_DISABLED_DEFAULT=0
-at runtime by sysctl vm.user_va0_disabled (cannot be cleared
at securelevel>0)

branches: 1.16.2;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

Add [default] option to make UAREAs swappable. Disabling the option makes
them unswappable and therefore allocatable using KSEG/BAT/etc.

Ephemeral mapping (emap) implementation. Concept is based on the idea that
activity of other threads will perform the TLB flush for the processes using
emap as a side effect. To track that, global and per-CPU generation numbers
are used. This idea was suggested by Andrew Doran; various improvements to
it by me. Notes:

- For now, zero-copy on pipe is not yet enabled.
- TCP socket code would likely need more work.
- Additional UVM loaning improvements are needed.

Proposed on <tech-kern>, silence there.
Quickly reviewed by <ad>.

kernel memory guard for DEBUG kernels, proposed on tech-kern.
See kmem_alloc(9) for details.

branches: 1.12.4;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.11.4; 1.11.6; 1.11.12;
- Switch off the map evcnts by default.
- SAVE_HINT() doesn't need to be atomic.

branches: 1.10.16; 1.10.18; 1.10.20; 1.10.22;
defparam PAGER_MAP_SIZE.

branches: 1.9.6; 1.9.8; 1.9.12;
Add native mremap system call based on the UVM implementation for
Linux compat. Add code to enforce alignment of the new location.
Special thanks to wizd for helping with the man page.

branches: 1.8.8;
PR/34837: Mindaguas: Add SysV SHM dynamic reallocation and locking to the
physical memory

uobj_wirepages and uobj_unwirepages from Mindaugas. PR/34771.
(commented out in files.uvm for now because there is no user in tree.)

http://mail-index.netbsd.org/tech-kern/2006/09/24/0000.html
http://mail-index.netbsd.org/tech-kern/2006/10/10/0000.html

add ubc window hit/miss evcnts.

branches: 1.5.2;
merge yamt-pdpolicy branch.
- separate page replacement policy from the rest of kernel
- implement an alternative replacement policy

branches: 1.4.6; 1.4.16; 1.4.20;
implement compat_linux mremap.

branches: 1.3.2; 1.3.4;
merge yamt-readahead branch.

branches: 1.2.2;
read-ahead statistics.

Move UVM files to files.uvm

"Make NetBSD great again!"

Introduce uvm_hotplug(9) to the kernel.

Many thanks, in no particular order to:

TNF, for funding the project.

Chuck Silvers - for multiple API reviews and feedback.
Nick Hudson - for testing on multiple architectures and bugfix patches.
Everyone who helped with boot testing.

KeK (http://www.kek.org.in) for hosting the primary developers.

allow the sizes of the maphist and pdhist to be set in the config
file via UVMHIST_MAPHIST_SIZE and UVMHIST_PDHIST_SIZE.

Make UVMHIST_PRINT work again by making it define KERNHIST_PRINT

Several changes and improvements in KMEM_GUARD:
- merge uvm_kmguard.{c,h} into subr_kmem.c. It is only user there, and
makes it more consistent. Also, it allows us to enable KMEM_GUARD
without enabling DEBUG.
- rename uvm_kmguard_XXX to kmem_guard_XXX, for consistency
- improve kmem_guard_alloc() so that it supports allocations bigger than
PAGE_SIZE
- remove the canary value, and use directly the kmem header as underflow
pattern.
- fix some comments

(The UAF fifo is disabled for the moment; we actually need to register
the va and its size, and add a weight support not to consume too much
memory.)

UVM_RESERVED_PAGES_PER_CPU must be a param, not a flag.

Allow changing the per-cpu emergency page reservation via kernel config.

branches: 1.22.2;
Use opt_*.h to not polute CPPFLAGS.

Attribute dependency is not yet. Revert a definition.

Define "uvm" attribute and mark files.

branches: 1.20.4;
fix the ordering and make UVMHIST enable KERNHIST automatically.

branches: 1.19.2;
Make UVM_PAGE_TRKOWN a real flag.

branches: 1.18.2;
rename the va0_disabled option and cpp conditional to "disable" as well,
for consistency, and document option and sysctl flag

Disable mapping of virtual address 0 by user programs per default.
This blocks an easy exploit of kernel bugs leading to dereference
of a NULL pointer on some architectures (eg i386).
The check can be disabled in various ways:
-by CPP definitions in machine/types.h (portmaster's choice)
-by a kernel config option USER_VA0_DISABLED_DEFAULT=0
-at runtime by sysctl vm.user_va0_disabled (cannot be cleared
at securelevel>0)

branches: 1.16.2;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

Add [default] option to make UAREAs swappable. Disabling the option makes
them unswappable and therefore allocatable using KSEG/BAT/etc.

Ephemeral mapping (emap) implementation. Concept is based on the idea that
activity of other threads will perform the TLB flush for the processes using
emap as a side effect. To track that, global and per-CPU generation numbers
are used. This idea was suggested by Andrew Doran; various improvements to
it by me. Notes:

- For now, zero-copy on pipe is not yet enabled.
- TCP socket code would likely need more work.
- Additional UVM loaning improvements are needed.

Proposed on <tech-kern>, silence there.
Quickly reviewed by <ad>.

kernel memory guard for DEBUG kernels, proposed on tech-kern.
See kmem_alloc(9) for details.

branches: 1.12.4;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.11.4; 1.11.6; 1.11.12;
- Switch off the map evcnts by default.
- SAVE_HINT() doesn't need to be atomic.

branches: 1.10.16; 1.10.18; 1.10.20; 1.10.22;
defparam PAGER_MAP_SIZE.

branches: 1.9.6; 1.9.8; 1.9.12;
Add native mremap system call based on the UVM implementation for
Linux compat. Add code to enforce alignment of the new location.
Special thanks to wizd for helping with the man page.

branches: 1.8.8;
PR/34837: Mindaguas: Add SysV SHM dynamic reallocation and locking to the
physical memory

uobj_wirepages and uobj_unwirepages from Mindaugas. PR/34771.
(commented out in files.uvm for now because there is no user in tree.)

http://mail-index.netbsd.org/tech-kern/2006/09/24/0000.html
http://mail-index.netbsd.org/tech-kern/2006/10/10/0000.html

add ubc window hit/miss evcnts.

branches: 1.5.2;
merge yamt-pdpolicy branch.
- separate page replacement policy from the rest of kernel
- implement an alternative replacement policy

branches: 1.4.6; 1.4.16; 1.4.20;
implement compat_linux mremap.

branches: 1.3.2; 1.3.4;
merge yamt-readahead branch.

branches: 1.2.2;
read-ahead statistics.

Move UVM files to files.uvm