svn commit: r338507 - in head/sys: sys vm

[Alexander Leidinger]

Quoting Mark Johnston <markj at 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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http://www.FreeBSD.org    netchild at FreeBSD.org  : PGP 0x8F31830F9F2772BF