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.
Bernd
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