MFH

Sponsored by: The FreeBSD Foundation

Typo in comment.

Merge ^/head r294169 through r294598.

MFH @r294567

MFH

Sponsored by: The FreeBSD Foundation

Various cleanups to the main function for AIO kernel processes:

- Pull the vmspace logic out into helper functions and reduce duplication.
Operations on the vmspace are all isolated to vm_map.c, b

Various cleanups to the main function for AIO kernel processes:

- Pull the vmspace logic out into helper functions and reduce duplication.
Operations on the vmspace are all isolated to vm_map.c, but it now exports
a new 'vmspace_switch_aio' for use by AIO kernel processes.
- When an AIO kernel process wants to exit, break out of the main loop and
perform cleanup after the loop end. This reduces a lot of indentation and
allows cleanup to more closely mirror setup actions before the loop starts.
- Convert a DIAGNOSTIC to KASSERT().
- Replace mycp with more typical 'p'.

Reviewed by: kib
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D4990

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Merge from head

Sponsored by: Gandi.net

Merge from head

Sync up with head (up to r288341).

Finish merging from head, messed up in previous attempt

Merge from head

Merge ^/head r287527 through r287679.

Remove a check which caused spurious SIGSEGV on usermode access to the
mapped address without valid pte installed, when parallel wiring of
the entry happen. The entry must be copy on write. If entr

Remove a check which caused spurious SIGSEGV on usermode access to the
mapped address without valid pte installed, when parallel wiring of
the entry happen. The entry must be copy on write. If entry is COW
but was already copied, and parallel wiring set
MAP_ENTRY_IN_TRANSITION, vm_fault() would sleep waiting for the
MAP_ENTRY_IN_TRANSITION flag to clear. After that, the fault handler
is restarted and vm_map_lookup() or vm_map_lookup_locked() trip over
the check. Note that this is race, if the address is accessed after
the wiring is done, the entry does not fault at all.

There is no reason in the current kernel to disallow write access to
the COW wired entry if the entry permissions allow it. Initially this
was done in r24666, since that kernel did not supported proper
copy-on-write for wired text, which was fixed in r199869. The r251901
revision re-introduced the r24666 fix for the current VM.

Note that write access must clear MAP_ENTRY_NEEDS_COPY entry flag by
performing COW. In reverse, when MAP_ENTRY_NEEDS_COPY is set in
vmspace_fork(), the MAP_ENTRY_USER_WIRED flag is cleared. Put the
assert stating the invariant, instead of returning the error.

Reported and debugging help by: peter
Reviewed by: alc
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

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Catch up with head, primarily for the 1.14.4.0 firmware.

Merge ^/head r285924 through r286421.

Do not pretend that vm_fault(9) supports unwiring the address. Rename
the VM_FAULT_CHANGE_WIRING flag to VM_FAULT_WIRE. Assert that the
flag is only passed when faulting on the wired map entry. Re

Do not pretend that vm_fault(9) supports unwiring the address. Rename
the VM_FAULT_CHANGE_WIRING flag to VM_FAULT_WIRE. Assert that the
flag is only passed when faulting on the wired map entry. Remove the
vm_page_unwire() call, which should be never reachable.

Since VM_FAULT_WIRE flag implies wired map entry, the TRYPAGER() macro
is reduced to the testing of the fs.object having a default pager.
Inline the check.

Suggested and reviewed by: alc
Tested by: pho (previous version)
MFC after: 1 week

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Merge ^/head r284737 through r285152.

Account for the main process stack being one page below the highest
user address when ABI uses shared page.

Note that the change is no-op for correctness, since shared page does
not fault. The mapp

Account for the main process stack being one page below the highest
user address when ABI uses shared page.

Note that the change is no-op for correctness, since shared page does
not fault. The mapping for the shared page is installed at the
address space creation, the page is unmanaged and its pte/pv entry
cannot be reclaimed.

Submitted by: Oliver Pinter
Review: https://reviews.freebsd.org/D2954
MFC after: 1 week

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Catch up with HEAD (r280229-r284686).

Merge ^/head r284188 through r284643.

Merge from head

Implement lockless resource limits.

Use the same scheme implemented to manage credentials.

Code needing to look at process's credentials (as opposed to thred's) is
provided with *_proc variants of

Implement lockless resource limits.

Use the same scheme implemented to manage credentials.

Code needing to look at process's credentials (as opposed to thred's) is
provided with *_proc variants of relevant functions.

Places which possibly had to take the proc lock anyway still use the proc
pointer to access limits.

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Merge sync of head

Merge from head

MFH: r281855-r282312

Sponsored by: The FreeBSD Foundation