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PGD Modification

Hi,

AFAIK Linux has per-process pgds (Page Global Directory). When a
kernel mapping changes such that a pmd mapping must be changed on the
pgd, is this done one by one to every per-process pgd on the system?
Is this not a frequent case? Are kernel mappings rarely changed? For
example kmalloc/kfree could cause a new page to be mapped/removed that
could cause change of a pmd mapping on the current (and I presume
every other) pgd.

Thanks,
Bahadir

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