Implement support for binary to requesting specific stack size for the
initial thread. It is read by the ELF image activator as the virtual
size of the PT_GNU_STACK program header entry, and can be

Implement support for binary to requesting specific stack size for the
initial thread. It is read by the ELF image activator as the virtual
size of the PT_GNU_STACK program header entry, and can be specified by
the linker option -z stack-size in newer binutils.

The soft RLIMIT_STACK is auto-increased if possible, to satisfy the
binary' request.

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

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Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

MFHead @ r275232

Merge ^/head r275118 through r275209.

The process spin lock currently has the following distinct uses:

- Threads lifetime cycle, in particular, counting of the threads in
the process, and interlocking with process mutex and thread loc

The process spin lock currently has the following distinct uses:

- Threads lifetime cycle, in particular, counting of the threads in
the process, and interlocking with process mutex and thread lock.
The main reason of this is that turnstile locks are after thread
locks, so you e.g. cannot unlock blockable mutex (think process
mutex) while owning thread lock.

- Virtual and profiling itimers, since the timers activation is done
from the clock interrupt context. Replace the p_slock by p_itimmtx
and PROC_ITIMLOCK().

- Profiling code (profil(2)), for similar reason. Replace the p_slock
by p_profmtx and PROC_PROFLOCK().

- Resource usage accounting. Need for the spinlock there is subtle,
my understanding is that spinlock blocks context switching for the
current thread, which prevents td_runtime and similar fields from
changing (updates are done at the mi_switch()). Replace the p_slock
by p_statmtx and PROC_STATLOCK().

The split is done mostly for code clarity, and should not affect
scalability.

Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

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ifdef RACCT ui_racct_foreach and struct uidinfo's ui_racct

Change racct_ create and destroy to macros evaluating to nothing without RACCT
so that their callers passing ui_racct don't have to be ifde

ifdef RACCT ui_racct_foreach and struct uidinfo's ui_racct

Change racct_ create and destroy to macros evaluating to nothing without RACCT
so that their callers passing ui_racct don't have to be ifdefed.

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Merge from head@274682

Sync to HEAD@r274095.

Tidy up functions related to uidinfo management.

- reference found uidinfo in uilookup
- reduce nesting by handling shorter cases first

De-k&r-ify function definitions in kern/kern_resource.c

No functional changes.

rlimit: plug duplicate assertion

counter sanity is already checked by refcount_release.

Merge head

IFC @264767

MFC @ r259635

This brings in the "-w" option from bhyve to ignore unknown MSRs.
It will make debugging Linux guests a bit easier.

Suggested by: Willem Jan Withagen (wjw at digiware nl)

Merge head up to r262222 (last merge was incomplete).

MFC @ r259205 in preparation for some SVM updates. (for real this time)

rlimit: avoid unnecessary copying of rlimits

If refcount is 1 just modify rlimits in place.

MFC after: 2 weeks

rlimit: add and utilize lim_shared

MFC after: 2 weeks

Merge head r232040 through r257457.
M usr.sbin/portsnap/portsnap/portsnap.8
M usr.sbin/portsnap/portsnap/portsnap.sh
M usr.sbin/tcpdump/tcpdump/Makefile

Add a resource limit for the total number of kqueues available to the
user. Kqueue now saves the ucred of the allocating thread, to
correctly decrement the counter on close.

Under some specific and

Add a resource limit for the total number of kqueues available to the
user. Kqueue now saves the ucred of the allocating thread, to
correctly decrement the counter on close.

Under some specific and not real-world use scenario for kqueue, it is
possible for the kqueues to consume memory proportional to the square
of the number of the filedescriptors available to the process. Limit
allows administrator to prevent the abuse.

This is kernel-mode side of the change, with the user-mode enabling
commit following.

Reported and tested by: pho
Discussed with: jmg
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks

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IFC @253398

Merge fresh head.

sync from head

MFC @248093