However the other type of works, if ever they come, can still block us
for long time. Will need a proper way to guarantee fairness.

The simplistic way around this may be to refuse to queue new pageout
works when found other type of works in the queue. Then vmscan will
fall back to pageout(). It's rare condition anyway and hardly deserves
a comprehensive fairness scheme.

Thanks,
Fengguang

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