When his happens, I see 100% kswapd in top; but no change in swap
pagein/pageout at all. In fact, minimal I/O.

That lead me to this bug:
https://bugzilla.kernel.org/show_bug.cgi?id=110501

And also to this recent kernel work, not yet landed and which may not
be related (since there's not much I/O in my case) to this problem;
but might help somewhat with the other thread on earlyoom and
unresponsive systems.

Buffered I/O without page-cache thrashing
https://lwn.net/Articles/806980/
https://marc.info/?l=linux-mm&m=157659359225356&w=2


---
Chris Murphy
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