Fix the deadlock between uvn_io() and uvn_flush() by restarting the fault.

Do not allow a faulting thread to sleep on a contended vnode lock to prevent
lock ordering issues with upcoming per-uobj lock.

Also reduce the sleep value for VM_PAGER_AGAIN from 1sec to 5nsec to not add
visible slowdown when starting a multi-threaded application with threads that
fault on the same vnode (chromium, firefox, etc).

Tested by anton@, tb@, robert@ and gnezdo@

ok anton@, tb@

Reported-by: syzbot+e63407b35dff08dbee02@syzkaller.appspotmail.com

spelling

ok mpi@

Bring back previous fix for UVM vnode deadlock.

tb@ reports that refaulting when there's contention on the vnode makes
firefox start very slowly on his machine. To revisit when the fault
handler will be unlocked.

ok anton@

Original commit message:

Fix a deadlock between uvn_io() and uvn_flush(). While faulting on a
page backed by a vnode, uvn_io() will end up being called in order to
populate newly allocated pages using I/O on the backing vnode. Before
performing the I/O, newly allocated pages are flagged as busy by
uvn_get(), that is before uvn_io() tries to lock the vnode. Such pages
could then end up being flushed by uvn_flush() which already has
acquired the vnode lock. Since such pages are flagged as busy,
uvn_flush() will wait for them to be flagged as not busy. This will
never happens as uvn_io() cannot make progress until the vnode lock is
released.

Instead, grab the vnode lock before allocating and flagging pages as
busy in uvn_get(). This does extend the scope in uvn_get() in which the
vnode is locked but resolves the deadlock.

ok mpi@

Reported-by: syzbot+e63407b35dff08dbee02@syzkaller.appspotmail.com

Fix the deadlock between uvn_io() and uvn_flush() by restarting the fault.

Do not allow a faulting thread to sleep on a contended vnode lock to prevent
lock ordering issues with upcoming per-uobj lock.

ok anton@

Reported-by: syzbot+e63407b35dff08dbee02@syzkaller.appspotmail.com

Chuck Cranor rescinded clauses in his license
on the 2nd of February 2011 in NetBSD.

http://marc.info/?l=netbsd-source-changes&m=129658899212732&w=2
http://marc.info/?l=netbsd-source-changes&m=129659095515558&w=2
http://marc.info/?l=netbsd-source-changes&m=129659157916514&w=2
http://marc.info/?l=netbsd-source-changes&m=129665962324372&w=2
http://marc.info/?l=netbsd-source-changes&m=129666033625342&w=2
http://marc.info/?l=netbsd-source-changes&m=129666052825545&w=2
http://marc.info/?l=netbsd-source-changes&m=129666922906480&w=2
http://marc.info/?l=netbsd-source-changes&m=129667725518082&w=2

the #ifdef _KERNEL can wrap the entire file. uvm_extern.h only pulls
this inside #ifdef _KERNEL in any case, so nothing really changes.

Put the PG_RELEASED changes diff back in.

This has has been tested very very thoroughly on all archs we have
excepting 88k and 68k. Please see cvs log for the individual commit
messages.

ok beck@, thib@

date based reversion of uvm to the 4th May.

More backouts in line with previous ones, this appears to bring us back to a
stable condition.

A machine forced to 64mb of ram cycled 10GB through swap with this diff
and is still running as I type this. Other tests by ariane@ and thib@
also seem to show that it's alright.

ok deraadt@, thib@, ariane@

Backout all changes to uvm after pmemrange (which will be backed out
separately).

a change at or just before the hackathon has either exposed or added a
very very nasty memory corruption bug that is giving us hell right now.
So in the interest of kernel stability these diffs are being backed out
until such a time as that corruption bug has been found and squashed,
then the ones that are proven good may slowly return.

a quick hitlist of the main commits this backs out:

mine:
uvm_objwire
the lock change in uvm_swap.c
using trees for uvm objects instead of the hash
removing the pgo_releasepg callback.

art@'s:
putting pmap_page_protect(VM_PROT_NONE) in uvm_pagedeactivate() since
all callers called that just prior anyway.

ok beck@, ariane@.

prompted by deraadt@.

Since we've now cleared up a lot of the PG_RELEASED setting, remove the
pgo_releasepg() hook and just free the page the "normal" way in the one
place we'll ever see PG_RELEASED and should care (uvm_page_unbusy,
called in aiodoned).

ok art@, beck@, thib@

remove PGO_OVERWRITE, PGO_WEAK and PGO_PASTEOF from the pager. They're all
unused.

ok art@.

Move all of the pseudo-inline functions in uvm into C files.

By pseudo-inline, I mean that if a certain macro was defined, they would
be inlined. However, no architecture defines that, and none has for a
very very long time. Therefore mainly this just makes the code a damned
sight easier to read. Some k&r -> ansi declarations while I'm in there.

"just commit it" art@. ok weingart@.

garbage collect uvm_errno2vmerror();

ok miod@, art@

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Cosmetic changes only, primarily making comments line up nicely after the
__P removal.

First round of __P removal in sys

UBC was a disaster. It worked very good when it worked, but on some
machines or some configurations or in some phase of the moon (we actually
don't know when or why) files disappeared. Since we've not been able to
track down the problem in two weeks intense debugging and we need -current
to be stable, back out everything to a state it had before UBC.

We apologise for the inconvenience.

branches: 1.16.2;
Sync in more uvm from NetBSD. Mostly just cosmetic stuff.
Contains also support for page coloring.

Sync in more uvm changes from NetBSD.
This time we're getting rid of KERN_* and VM_PAGER_* error codes and
use errnos instead.

Merge in some parts of the ubc work that has been done in NetBSD that are not
UBC, but prerequsites for it.

- Create a daemon that processes async I/O (swap and paging in the future)
requests that need processing in process context and that were processed
in the pagedaemon before.
- Convert some ugly ifdef DIAGNOSTIC code to less intrusive KASSERTs.
- misc other cleanups.

Another sync of uvm to NetBSD. Just minor fiddling, no major changes.

Minor sync to NetBSD.

vm_pager.h no more

Various random fixes from NetBSD.
Including support for zeroing pages in the idle loop (not enabled yet).

Add a new type voff_t (right now it's typedefed as off_t) used for offsets
into objects.

Gives the possibilty to mmap beyond the size of vaddr_t.

From NetBSD.

Add support for disabling swap devices (swapctl -d).
Improve error handling on I/O errors to swap.
From NetBSD

Sync style, typo, and comments a little closer to NetBSD. art@ ok

Protect protypes, certain macros, and inlines from userland. Checked userland
with a 'make build'. From NetBSD. art@ ok

$OpenBSD$

Fix the NetBSD id strings.

branches: 1.3.4;
sync with NetBSD from 1999.05.24 (there is a reason for this date)
Mostly cleanups, but also a few improvements to pagedaemon for better
handling of low memory and/or low swap conditions.

add OpenBSD tags

Import of uvm from NetBSD. Some local changes, some code disabled

spelling

ok mpi@

Bring back previous fix for UVM vnode deadlock.

tb@ reports that refaulting when there's contention on the vnode makes
firefox start very slowly on his machine. To revisit when the fault
handler will be unlocked.

ok anton@

Original commit message:

Fix a deadlock between uvn_io() and uvn_flush(). While faulting on a
page backed by a vnode, uvn_io() will end up being called in order to
populate newly allocated pages using I/O on the backing vnode. Before
performing the I/O, newly allocated pages are flagged as busy by
uvn_get(), that is before uvn_io() tries to lock the vnode. Such pages
could then end up being flushed by uvn_flush() which already has
acquired the vnode lock. Since such pages are flagged as busy,
uvn_flush() will wait for them to be flagged as not busy. This will
never happens as uvn_io() cannot make progress until the vnode lock is
released.

Instead, grab the vnode lock before allocating and flagging pages as
busy in uvn_get(). This does extend the scope in uvn_get() in which the
vnode is locked but resolves the deadlock.

ok mpi@

Reported-by: syzbot+e63407b35dff08dbee02@syzkaller.appspotmail.com

Fix the deadlock between uvn_io() and uvn_flush() by restarting the fault.

Do not allow a faulting thread to sleep on a contended vnode lock to prevent
lock ordering issues with upcoming per-uobj lock.

ok anton@

Reported-by: syzbot+e63407b35dff08dbee02@syzkaller.appspotmail.com

Chuck Cranor rescinded clauses in his license
on the 2nd of February 2011 in NetBSD.

http://marc.info/?l=netbsd-source-changes&m=129658899212732&w=2
http://marc.info/?l=netbsd-source-changes&m=129659095515558&w=2
http://marc.info/?l=netbsd-source-changes&m=129659157916514&w=2
http://marc.info/?l=netbsd-source-changes&m=129665962324372&w=2
http://marc.info/?l=netbsd-source-changes&m=129666033625342&w=2
http://marc.info/?l=netbsd-source-changes&m=129666052825545&w=2
http://marc.info/?l=netbsd-source-changes&m=129666922906480&w=2
http://marc.info/?l=netbsd-source-changes&m=129667725518082&w=2

the #ifdef _KERNEL can wrap the entire file. uvm_extern.h only pulls
this inside #ifdef _KERNEL in any case, so nothing really changes.

Put the PG_RELEASED changes diff back in.

This has has been tested very very thoroughly on all archs we have
excepting 88k and 68k. Please see cvs log for the individual commit
messages.

ok beck@, thib@

date based reversion of uvm to the 4th May.

More backouts in line with previous ones, this appears to bring us back to a
stable condition.

A machine forced to 64mb of ram cycled 10GB through swap with this diff
and is still running as I type this. Other tests by ariane@ and thib@
also seem to show that it's alright.

ok deraadt@, thib@, ariane@

Backout all changes to uvm after pmemrange (which will be backed out
separately).

a change at or just before the hackathon has either exposed or added a
very very nasty memory corruption bug that is giving us hell right now.
So in the interest of kernel stability these diffs are being backed out
until such a time as that corruption bug has been found and squashed,
then the ones that are proven good may slowly return.

a quick hitlist of the main commits this backs out:

mine:
uvm_objwire
the lock change in uvm_swap.c
using trees for uvm objects instead of the hash
removing the pgo_releasepg callback.

art@'s:
putting pmap_page_protect(VM_PROT_NONE) in uvm_pagedeactivate() since
all callers called that just prior anyway.

ok beck@, ariane@.

prompted by deraadt@.

Since we've now cleared up a lot of the PG_RELEASED setting, remove the
pgo_releasepg() hook and just free the page the "normal" way in the one
place we'll ever see PG_RELEASED and should care (uvm_page_unbusy,
called in aiodoned).

ok art@, beck@, thib@

remove PGO_OVERWRITE, PGO_WEAK and PGO_PASTEOF from the pager. They're all
unused.

ok art@.

Move all of the pseudo-inline functions in uvm into C files.

By pseudo-inline, I mean that if a certain macro was defined, they would
be inlined. However, no architecture defines that, and none has for a
very very long time. Therefore mainly this just makes the code a damned
sight easier to read. Some k&r -> ansi declarations while I'm in there.

"just commit it" art@. ok weingart@.

garbage collect uvm_errno2vmerror();

ok miod@, art@

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Cosmetic changes only, primarily making comments line up nicely after the
__P removal.

First round of __P removal in sys

UBC was a disaster. It worked very good when it worked, but on some
machines or some configurations or in some phase of the moon (we actually
don't know when or why) files disappeared. Since we've not been able to
track down the problem in two weeks intense debugging and we need -current
to be stable, back out everything to a state it had before UBC.

We apologise for the inconvenience.

branches: 1.16.2;
Sync in more uvm from NetBSD. Mostly just cosmetic stuff.
Contains also support for page coloring.

Sync in more uvm changes from NetBSD.
This time we're getting rid of KERN_* and VM_PAGER_* error codes and
use errnos instead.

Merge in some parts of the ubc work that has been done in NetBSD that are not
UBC, but prerequsites for it.

- Create a daemon that processes async I/O (swap and paging in the future)
requests that need processing in process context and that were processed
in the pagedaemon before.
- Convert some ugly ifdef DIAGNOSTIC code to less intrusive KASSERTs.
- misc other cleanups.

Another sync of uvm to NetBSD. Just minor fiddling, no major changes.

Minor sync to NetBSD.

vm_pager.h no more

Various random fixes from NetBSD.
Including support for zeroing pages in the idle loop (not enabled yet).

Add a new type voff_t (right now it's typedefed as off_t) used for offsets
into objects.

Gives the possibilty to mmap beyond the size of vaddr_t.

From NetBSD.

Add support for disabling swap devices (swapctl -d).
Improve error handling on I/O errors to swap.
From NetBSD

Sync style, typo, and comments a little closer to NetBSD. art@ ok

Protect protypes, certain macros, and inlines from userland. Checked userland
with a 'make build'. From NetBSD. art@ ok

$OpenBSD$

Fix the NetBSD id strings.

branches: 1.3.4;
sync with NetBSD from 1999.05.24 (there is a reason for this date)
Mostly cleanups, but also a few improvements to pagedaemon for better
handling of low memory and/or low swap conditions.

add OpenBSD tags

Import of uvm from NetBSD. Some local changes, some code disabled

Bring back previous fix for UVM vnode deadlock.

tb@ reports that refaulting when there's contention on the vnode makes
firefox start very slowly on his machine. To revisit when the fault
handler will be unlocked.

ok anton@

Original commit message:

Fix a deadlock between uvn_io() and uvn_flush(). While faulting on a
page backed by a vnode, uvn_io() will end up being called in order to
populate newly allocated pages using I/O on the backing vnode. Before
performing the I/O, newly allocated pages are flagged as busy by
uvn_get(), that is before uvn_io() tries to lock the vnode. Such pages
could then end up being flushed by uvn_flush() which already has
acquired the vnode lock. Since such pages are flagged as busy,
uvn_flush() will wait for them to be flagged as not busy. This will
never happens as uvn_io() cannot make progress until the vnode lock is
released.

Instead, grab the vnode lock before allocating and flagging pages as
busy in uvn_get(). This does extend the scope in uvn_get() in which the
vnode is locked but resolves the deadlock.

ok mpi@

Reported-by: syzbot+e63407b35dff08dbee02@syzkaller.appspotmail.com

Fix the deadlock between uvn_io() and uvn_flush() by restarting the fault.

Do not allow a faulting thread to sleep on a contended vnode lock to prevent
lock ordering issues with upcoming per-uobj lock.

ok anton@

Reported-by: syzbot+e63407b35dff08dbee02@syzkaller.appspotmail.com

Chuck Cranor rescinded clauses in his license
on the 2nd of February 2011 in NetBSD.

http://marc.info/?l=netbsd-source-changes&m=129658899212732&w=2
http://marc.info/?l=netbsd-source-changes&m=129659095515558&w=2
http://marc.info/?l=netbsd-source-changes&m=129659157916514&w=2
http://marc.info/?l=netbsd-source-changes&m=129665962324372&w=2
http://marc.info/?l=netbsd-source-changes&m=129666033625342&w=2
http://marc.info/?l=netbsd-source-changes&m=129666052825545&w=2
http://marc.info/?l=netbsd-source-changes&m=129666922906480&w=2
http://marc.info/?l=netbsd-source-changes&m=129667725518082&w=2

the #ifdef _KERNEL can wrap the entire file. uvm_extern.h only pulls
this inside #ifdef _KERNEL in any case, so nothing really changes.

Put the PG_RELEASED changes diff back in.

This has has been tested very very thoroughly on all archs we have
excepting 88k and 68k. Please see cvs log for the individual commit
messages.

ok beck@, thib@

date based reversion of uvm to the 4th May.

More backouts in line with previous ones, this appears to bring us back to a
stable condition.

A machine forced to 64mb of ram cycled 10GB through swap with this diff
and is still running as I type this. Other tests by ariane@ and thib@
also seem to show that it's alright.

ok deraadt@, thib@, ariane@

Backout all changes to uvm after pmemrange (which will be backed out
separately).

a change at or just before the hackathon has either exposed or added a
very very nasty memory corruption bug that is giving us hell right now.
So in the interest of kernel stability these diffs are being backed out
until such a time as that corruption bug has been found and squashed,
then the ones that are proven good may slowly return.

a quick hitlist of the main commits this backs out:

mine:
uvm_objwire
the lock change in uvm_swap.c
using trees for uvm objects instead of the hash
removing the pgo_releasepg callback.

art@'s:
putting pmap_page_protect(VM_PROT_NONE) in uvm_pagedeactivate() since
all callers called that just prior anyway.

ok beck@, ariane@.

prompted by deraadt@.

Since we've now cleared up a lot of the PG_RELEASED setting, remove the
pgo_releasepg() hook and just free the page the "normal" way in the one
place we'll ever see PG_RELEASED and should care (uvm_page_unbusy,
called in aiodoned).

ok art@, beck@, thib@

remove PGO_OVERWRITE, PGO_WEAK and PGO_PASTEOF from the pager. They're all
unused.

ok art@.

Move all of the pseudo-inline functions in uvm into C files.

By pseudo-inline, I mean that if a certain macro was defined, they would
be inlined. However, no architecture defines that, and none has for a
very very long time. Therefore mainly this just makes the code a damned
sight easier to read. Some k&r -> ansi declarations while I'm in there.

"just commit it" art@. ok weingart@.

garbage collect uvm_errno2vmerror();

ok miod@, art@

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Cosmetic changes only, primarily making comments line up nicely after the
__P removal.

First round of __P removal in sys

UBC was a disaster. It worked very good when it worked, but on some
machines or some configurations or in some phase of the moon (we actually
don't know when or why) files disappeared. Since we've not been able to
track down the problem in two weeks intense debugging and we need -current
to be stable, back out everything to a state it had before UBC.

We apologise for the inconvenience.

branches: 1.16.2;
Sync in more uvm from NetBSD. Mostly just cosmetic stuff.
Contains also support for page coloring.

Sync in more uvm changes from NetBSD.
This time we're getting rid of KERN_* and VM_PAGER_* error codes and
use errnos instead.

Merge in some parts of the ubc work that has been done in NetBSD that are not
UBC, but prerequsites for it.

- Create a daemon that processes async I/O (swap and paging in the future)
requests that need processing in process context and that were processed
in the pagedaemon before.
- Convert some ugly ifdef DIAGNOSTIC code to less intrusive KASSERTs.
- misc other cleanups.

Another sync of uvm to NetBSD. Just minor fiddling, no major changes.

Minor sync to NetBSD.

vm_pager.h no more

Various random fixes from NetBSD.
Including support for zeroing pages in the idle loop (not enabled yet).

Add a new type voff_t (right now it's typedefed as off_t) used for offsets
into objects.

Gives the possibilty to mmap beyond the size of vaddr_t.

From NetBSD.

Add support for disabling swap devices (swapctl -d).
Improve error handling on I/O errors to swap.
From NetBSD

Sync style, typo, and comments a little closer to NetBSD. art@ ok

Protect protypes, certain macros, and inlines from userland. Checked userland
with a 'make build'. From NetBSD. art@ ok

$OpenBSD$

Fix the NetBSD id strings.

branches: 1.3.4;
sync with NetBSD from 1999.05.24 (there is a reason for this date)
Mostly cleanups, but also a few improvements to pagedaemon for better
handling of low memory and/or low swap conditions.

add OpenBSD tags

Import of uvm from NetBSD. Some local changes, some code disabled

Fix the deadlock between uvn_io() and uvn_flush() by restarting the fault.

Do not allow a faulting thread to sleep on a contended vnode lock to prevent
lock ordering issues with upcoming per-uobj lock.

ok anton@

Reported-by: syzbot+e63407b35dff08dbee02@syzkaller.appspotmail.com

Chuck Cranor rescinded clauses in his license
on the 2nd of February 2011 in NetBSD.

http://marc.info/?l=netbsd-source-changes&m=129658899212732&w=2
http://marc.info/?l=netbsd-source-changes&m=129659095515558&w=2
http://marc.info/?l=netbsd-source-changes&m=129659157916514&w=2
http://marc.info/?l=netbsd-source-changes&m=129665962324372&w=2
http://marc.info/?l=netbsd-source-changes&m=129666033625342&w=2
http://marc.info/?l=netbsd-source-changes&m=129666052825545&w=2
http://marc.info/?l=netbsd-source-changes&m=129666922906480&w=2
http://marc.info/?l=netbsd-source-changes&m=129667725518082&w=2

the #ifdef _KERNEL can wrap the entire file. uvm_extern.h only pulls
this inside #ifdef _KERNEL in any case, so nothing really changes.

Put the PG_RELEASED changes diff back in.

This has has been tested very very thoroughly on all archs we have
excepting 88k and 68k. Please see cvs log for the individual commit
messages.

ok beck@, thib@

date based reversion of uvm to the 4th May.

More backouts in line with previous ones, this appears to bring us back to a
stable condition.

A machine forced to 64mb of ram cycled 10GB through swap with this diff
and is still running as I type this. Other tests by ariane@ and thib@
also seem to show that it's alright.

ok deraadt@, thib@, ariane@

Backout all changes to uvm after pmemrange (which will be backed out
separately).

a change at or just before the hackathon has either exposed or added a
very very nasty memory corruption bug that is giving us hell right now.
So in the interest of kernel stability these diffs are being backed out
until such a time as that corruption bug has been found and squashed,
then the ones that are proven good may slowly return.

a quick hitlist of the main commits this backs out:

mine:
uvm_objwire
the lock change in uvm_swap.c
using trees for uvm objects instead of the hash
removing the pgo_releasepg callback.

art@'s:
putting pmap_page_protect(VM_PROT_NONE) in uvm_pagedeactivate() since
all callers called that just prior anyway.

ok beck@, ariane@.

prompted by deraadt@.

Since we've now cleared up a lot of the PG_RELEASED setting, remove the
pgo_releasepg() hook and just free the page the "normal" way in the one
place we'll ever see PG_RELEASED and should care (uvm_page_unbusy,
called in aiodoned).

ok art@, beck@, thib@

remove PGO_OVERWRITE, PGO_WEAK and PGO_PASTEOF from the pager. They're all
unused.

ok art@.

Move all of the pseudo-inline functions in uvm into C files.

By pseudo-inline, I mean that if a certain macro was defined, they would
be inlined. However, no architecture defines that, and none has for a
very very long time. Therefore mainly this just makes the code a damned
sight easier to read. Some k&r -> ansi declarations while I'm in there.

"just commit it" art@. ok weingart@.

garbage collect uvm_errno2vmerror();

ok miod@, art@

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Cosmetic changes only, primarily making comments line up nicely after the
__P removal.

First round of __P removal in sys

UBC was a disaster. It worked very good when it worked, but on some
machines or some configurations or in some phase of the moon (we actually
don't know when or why) files disappeared. Since we've not been able to
track down the problem in two weeks intense debugging and we need -current
to be stable, back out everything to a state it had before UBC.

We apologise for the inconvenience.

branches: 1.16.2;
Sync in more uvm from NetBSD. Mostly just cosmetic stuff.
Contains also support for page coloring.

Sync in more uvm changes from NetBSD.
This time we're getting rid of KERN_* and VM_PAGER_* error codes and
use errnos instead.

Merge in some parts of the ubc work that has been done in NetBSD that are not
UBC, but prerequsites for it.

- Create a daemon that processes async I/O (swap and paging in the future)
requests that need processing in process context and that were processed
in the pagedaemon before.
- Convert some ugly ifdef DIAGNOSTIC code to less intrusive KASSERTs.
- misc other cleanups.

Another sync of uvm to NetBSD. Just minor fiddling, no major changes.

Minor sync to NetBSD.

vm_pager.h no more

Various random fixes from NetBSD.
Including support for zeroing pages in the idle loop (not enabled yet).

Add a new type voff_t (right now it's typedefed as off_t) used for offsets
into objects.

Gives the possibilty to mmap beyond the size of vaddr_t.

From NetBSD.

Add support for disabling swap devices (swapctl -d).
Improve error handling on I/O errors to swap.
From NetBSD

Sync style, typo, and comments a little closer to NetBSD. art@ ok

Protect protypes, certain macros, and inlines from userland. Checked userland
with a 'make build'. From NetBSD. art@ ok

$OpenBSD$

Fix the NetBSD id strings.

branches: 1.3.4;
sync with NetBSD from 1999.05.24 (there is a reason for this date)
Mostly cleanups, but also a few improvements to pagedaemon for better
handling of low memory and/or low swap conditions.

add OpenBSD tags

Import of uvm from NetBSD. Some local changes, some code disabled

Chuck Cranor rescinded clauses in his license
on the 2nd of February 2011 in NetBSD.

http://marc.info/?l=netbsd-source-changes&m=129658899212732&w=2
http://marc.info/?l=netbsd-source-changes&m=129659095515558&w=2
http://marc.info/?l=netbsd-source-changes&m=129659157916514&w=2
http://marc.info/?l=netbsd-source-changes&m=129665962324372&w=2
http://marc.info/?l=netbsd-source-changes&m=129666033625342&w=2
http://marc.info/?l=netbsd-source-changes&m=129666052825545&w=2
http://marc.info/?l=netbsd-source-changes&m=129666922906480&w=2
http://marc.info/?l=netbsd-source-changes&m=129667725518082&w=2

the #ifdef _KERNEL can wrap the entire file. uvm_extern.h only pulls
this inside #ifdef _KERNEL in any case, so nothing really changes.

Put the PG_RELEASED changes diff back in.

This has has been tested very very thoroughly on all archs we have
excepting 88k and 68k. Please see cvs log for the individual commit
messages.

ok beck@, thib@

date based reversion of uvm to the 4th May.

More backouts in line with previous ones, this appears to bring us back to a
stable condition.

A machine forced to 64mb of ram cycled 10GB through swap with this diff
and is still running as I type this. Other tests by ariane@ and thib@
also seem to show that it's alright.

ok deraadt@, thib@, ariane@

Backout all changes to uvm after pmemrange (which will be backed out
separately).

a change at or just before the hackathon has either exposed or added a
very very nasty memory corruption bug that is giving us hell right now.
So in the interest of kernel stability these diffs are being backed out
until such a time as that corruption bug has been found and squashed,
then the ones that are proven good may slowly return.

a quick hitlist of the main commits this backs out:

mine:
uvm_objwire
the lock change in uvm_swap.c
using trees for uvm objects instead of the hash
removing the pgo_releasepg callback.

art@'s:
putting pmap_page_protect(VM_PROT_NONE) in uvm_pagedeactivate() since
all callers called that just prior anyway.

ok beck@, ariane@.

prompted by deraadt@.

Since we've now cleared up a lot of the PG_RELEASED setting, remove the
pgo_releasepg() hook and just free the page the "normal" way in the one
place we'll ever see PG_RELEASED and should care (uvm_page_unbusy,
called in aiodoned).

ok art@, beck@, thib@

remove PGO_OVERWRITE, PGO_WEAK and PGO_PASTEOF from the pager. They're all
unused.

ok art@.

Move all of the pseudo-inline functions in uvm into C files.

By pseudo-inline, I mean that if a certain macro was defined, they would
be inlined. However, no architecture defines that, and none has for a
very very long time. Therefore mainly this just makes the code a damned
sight easier to read. Some k&r -> ansi declarations while I'm in there.

"just commit it" art@. ok weingart@.

garbage collect uvm_errno2vmerror();

ok miod@, art@

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Cosmetic changes only, primarily making comments line up nicely after the
__P removal.

First round of __P removal in sys

UBC was a disaster. It worked very good when it worked, but on some
machines or some configurations or in some phase of the moon (we actually
don't know when or why) files disappeared. Since we've not been able to
track down the problem in two weeks intense debugging and we need -current
to be stable, back out everything to a state it had before UBC.

We apologise for the inconvenience.

branches: 1.16.2;
Sync in more uvm from NetBSD. Mostly just cosmetic stuff.
Contains also support for page coloring.

Sync in more uvm changes from NetBSD.
This time we're getting rid of KERN_* and VM_PAGER_* error codes and
use errnos instead.

Merge in some parts of the ubc work that has been done in NetBSD that are not
UBC, but prerequsites for it.

- Create a daemon that processes async I/O (swap and paging in the future)
requests that need processing in process context and that were processed
in the pagedaemon before.
- Convert some ugly ifdef DIAGNOSTIC code to less intrusive KASSERTs.
- misc other cleanups.

Another sync of uvm to NetBSD. Just minor fiddling, no major changes.

Minor sync to NetBSD.

vm_pager.h no more

Various random fixes from NetBSD.
Including support for zeroing pages in the idle loop (not enabled yet).

Add a new type voff_t (right now it's typedefed as off_t) used for offsets
into objects.

Gives the possibilty to mmap beyond the size of vaddr_t.

From NetBSD.

Add support for disabling swap devices (swapctl -d).
Improve error handling on I/O errors to swap.
From NetBSD

Sync style, typo, and comments a little closer to NetBSD. art@ ok

Protect protypes, certain macros, and inlines from userland. Checked userland
with a 'make build'. From NetBSD. art@ ok

$OpenBSD$

Fix the NetBSD id strings.

branches: 1.3.4;
sync with NetBSD from 1999.05.24 (there is a reason for this date)
Mostly cleanups, but also a few improvements to pagedaemon for better
handling of low memory and/or low swap conditions.

add OpenBSD tags

Import of uvm from NetBSD. Some local changes, some code disabled