Heavy I/O causing slow interactivity

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I'm running gentoo and it's emerging llvm.  This I/O heavy process is
causing slowdowns when I attempt interactive stuff, including watching
a youtube video and accessing a chatroom.

Similar latency is induced during a heavy database application.

As an end user is there anything I can do to better support
interactive performance?

And as a potential kernel developer, is there anything I could tweak
in the kernel source to mitigate this behavior?

I've tried SCHED_IDLE and idle class with ionice, both to no avail.

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