Question about sync_global_pgds in arch/x86/mm/init_64.c
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Question about sync_global_pgds in arch/x86/mm/init_64.c
sync_global_pgds are called after new entries are added to current page tables. For example, it is called at in side vmemmap_populate.
I understand why and how it syncs pgd globally. I am confused by why it does not sync lower levels of page tables like PUD/PMD as well. Is it because of performance concern? Yet, if lower level of page tables are not synced here, when will they be synced.
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Question about sync_global_pgds in arch/x86/mm/init_64.c
