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Improve error handling on I/O errors to swap.
From NetBSD
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and arbitrary flags into one argument.
One new flag is PMAP_CANFAIL that tells pmap_enter that it can fail if there
are not enough resources to satisfy the request. If this flag is not passed,
pmap_enter should panic as it should have done before this change (XXX - many
pmaps are still not doing that).
Only i386 and alpha implement CANFAIL for now.
Includes uvm updates from NetBSD.
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The archs that didn't have a proper PMAP_NEW now have a dummy implementation
with wrappers around the old functions.
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- thread_sleep_msg() -> uvm_sleep()
- initialize reference count lock in uvm_anon_{init,add}()
- add uao_flush()
- replace boolean 'islocked' with 'lockflags'
- in uvm_fault() change FALSE to TRUE to in 'wide' fault handling
- get rid of uvm_km_get()
- various bug fixes
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boolean_t pmap_extract(struct pmap *, vaddr_t, paddr_t *).
Matches NetBSD. Tested by various people on various platforms.
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- Change pmap_change_wiring to pmap_unwire because it's only called that way.
- Remove pmap_pageable because it's seldom implemented and when it is, it's
either almost useless or incorrect. The same information is already passed
to the pmap anyway by pmap_enter and pmap_unwire.
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- make sure that vsunlock doesn't unwire mlocked memory.
- fix locking in uvm_useracc.
- Return the error uvm_fault_wire in uvm_vslock (will be used soon).
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Implements mincore(2), mlockall(2) and munlockall(2). mlockall and munlockall
are disabled for the moment.
The rest is mostly cosmetic.
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wrapper, so this removes a dependence on the old VM system. From NetBSD.
art@ ok
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- Introduce a new type of map that are interrupt safe and never allow faults
in them. mb_map and kmem_map are made intrsafe.
- Add "access protection" to uvm_vslock (to be passed down to uvm_fault and
later to pmap_enter).
- madvise(2) now works.
- various cleanups.
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the access type that caused this mapping. This is to simplify pmaps
with mod/ref emulation (none for the moment) and in some cases speed
up pmap_is_{referenced,modified}.
At the same time, clean up some mappings that had too high protection.
XXX - the access type is incorrect in old vm, it's only used by uvm and MD code.
The actual use of this in pmap_enter implementations is not in this commit.
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Mostly cleanups, but also a few improvements to pagedaemon for better
handling of low memory and/or low swap conditions.
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