[Bug 272536] 'make buildworld -j 8' fails: pid 79018 (clang), jid 0, uid 0, was killed: a thread waiting too long to allocate a page

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272536

Mark Millard <marklmi26-fbsd@yahoo.com> changed:

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                 CC|                            |marklmi26-fbsd@yahoo.com

--- Comment #1 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
The actual message is from sys/vm/vm_pageout.c (looking in modern source):

                case VM_OOM_MEM_PF:
                        reason = "a thread waited too long to allocate a page";
                        break;

("waited" instead of "waiting").

Do you have anything specific for what controls getting
VM_OOM_MEM_PF:

# sysctl -d vm.pfault_oom_wait vm.pfault_oom_attempts
vm.pfault_oom_wait: Number of seconds to wait for free pages before retrying
the page fault handler
vm.pfault_oom_attempts: Number of page allocation attempts in page fault
handler before it triggers OOM handling

The defaults are:

# sysctl vm.pfault_oom_wait vm.pfault_oom_attempts
vm.pfault_oom_wait: 10
vm.pfault_oom_attempts: 3

What sort of storage media was the swap space on? Spinning Rust?

Sometimes VM environments have accuracy problems with various forms
of time handling. So that might be another direction involved for
this issue.

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