On 13 Mar 2021, at 2:57, Yu Zhao wrote: > Some architectures support the accessed bit on non-leaf PMD entries > (parents) in addition to leaf PTE entries (children) where pages are > mapped, e.g., x86_64 sets the accessed bit on a parent when using it > as part of linear-address translation [1]. Page table walkers who are > interested in the accessed bit on children can take advantage of this: > they do not need to search the children when the accessed bit is not > set on a parent, given that they have previously cleared the accessed > bit on this parent in addition to its children. > > [1]: Intel 64 and IA-32 Architectures Software Developer's Manual > Volume 3 (October 2019), section 4.8 Just curious. Does this also apply to non-leaf PUD entries? Do you mind sharing which sentence from the manual gives the information? Thanks. — Best Regards, Yan Zi
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