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SubjectRe: [00/41] Large Blocksize Support V7 (adds memmap support)
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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