[$] 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.