I've uploaded another test kernel (5.4.0-24.28+lp1861359v2):
https://kernel.ubuntu.com/~arighi/LP-1861359/

In this one, instead of completely disabling the i915 shrinker, I'm only
preventing to swap out the i915 caches when the system is short on
memory.

I'm testing this new one on my laptop right now and it seems to be a
better compromise, since it still allows to free up some i915 memory,
but it also prevents to completely kill interactive performance.

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https://bugs.launchpad.net/bugs/1861359

Title:
  swap storms kills interactive use

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