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SubjectRe: No more bits in vm_area_struct's vm_flags.

Another concern that has not been discussed is the increased cache
footprint due to a slightly enlarged vm data working set (there is also a
corresponding icache issue since additional accesses are needed).

Could we stick with the current size and do combinations of flags like we
do with page flags? VM_HUGETLB cannot grow up and down f.e. and there are
certainly lots of other impossible combinations that can be used to put
more information into the flags.

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