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re: UVM behavior under memory pressure

one additional thing about the behaviour of vm.*{min,max}
is that they do not (currently?) consider how much memory
is consumed by major kernel consumers like pools.  eg, there
is a known radeondrmkms leak we have not figured out why it
happens only sometimes, and this ends up making the kmem-160
or kmem-192 (size depends on DIAGNOSTIC, IIRC) pool grow,
possibly using serious percentage of the total memory, which
can end up meaning that adding vm.*min to 95% actually means
way more than 100% of available memory.

so, also check what "vmstat -m" says pools are using.

(we should fix this.  anyone want to define what the right
solution is? :-)


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