An end to high memory?

This patch from Johannes Weiner seemed like a straightforward way to improve memory-reclaim performance; without it, the virtual filesystem layer throws away memory that the memory-management subsystem thinks is still worth keeping. But that patch quickly ran afoul of a feature (or "misfeature" depending on who one asks) from the distant past, one which goes by the name of "high memory". Now, more than 20 years after its addition, high memory may be brought down low, as developers consider whether it should be deprecated and eventually removed from the kernel altogether.

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