Christoph Lameter wrote:
True. That is why we want to limit the number of unmovable allocations and that is why ZONE_MOVABLE exists to limit those. However, unmovable allocations are already rare today. The overwhelming majority of allocations are movable and reclaimable. You can see that f.e. by looking at /proc/meminfo and see how high SUnreclaim: is (does not catch everything but its a good indicator).
Just to inject another factor into the discussion, please remember that Linux also runs on nommu systems, where things like user space allocations are neither movable nor reclaimable.
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