Quoting Mark Johnston <ma...@freebsd.org> (from Thu, 6 Sep 2018
19:28:53 +0000 (UTC)):
Author: markj
Date: Thu Sep 6 19:28:52 2018
New Revision: 338507
URL: https://svnweb.freebsd.org/changeset/base/338507
Log:
Avoid resource deadlocks when one domain has exhausted its memory. Attempt
other allowed domains if the requested domain is below the minimum paging
threshold. Block in fork only if all domains available to the forking
thread are below the severe threshold rather than any.
Could the problem you fixed manifest itself in e.g. a hanging system
due to not enough memory free despite top displaying a lot of memory
free (let's assume 2 memory domains and several gigs in both)?
I have a system which never went below a specific amount of memory
(before the fix of the no-rebalancing bug in the scheduler) if NUMA
was enabled. With NUMA disabled I see much less memory free. I haven't
tried NUMA after the fix of the scheduler, but would give it a try
again if you think this could be a manifestation of the problem.
Bye,
Alexander.
--
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