Fix OOM handling of some corner cases.

In addition to pagedaemon initiating OOM, also do it from the
vm_fault() internals.  Namely, if the thread waits for a free page to
satisfy page fault some preconfigured amount of time, trigger OOM.
These triggers are rate-limited, due to a usual case of several
threads of the same multi-threaded process to enter fault handler
simultaneously.  The faults from pagedaemon threads participate in the
calculation of OOM rate, but are not under the limit.

Reviewed by:	markj (previous version)
Tested by:	pho
Discussed with:	alc
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D13671

0 files changed, 0 insertions, 0 deletions