[Bug 280846] Low memory freezes / OOM: a thread waited too long to allocate a page

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 02 Oct 2024 02:09:05 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280846

--- Comment #18 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Henrich Hartzer from comment #15)

One thing that high memory use can do is to swap
out the kernel stacks of processes that allow you
to control/communicate with the system. At that
point they can not run at all until swapped back
in. This can be avoided via /etc/sysctl.conf
having:

#
# Together this pair avoids swapping out the process kernel stacks.
# This avoids processes for interacting with the system from being
# hung-up by such.
vm.swap_enabled=0
vm.swap_idle_enabled=0

(main [so: 15] now always does this and no longer
has those to control.)

This does not prevent OOM kills of such processes:
that is a separate issue.

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