On Wed, 2021-04-14 at 08:51 -0700, Andi Kleen wrote: > > 2) It will not scan PTE tables under non-leaf PMD entries that > > do not > > have the accessed bit set, when > > CONFIG_HAVE_ARCH_PARENT_PMD_YOUNG=y. > > This assumes that workloads have reasonable locality. Could there > be a worst case where only one or two pages in each PTE are used, > so this PTE skipping trick doesn't work? Databases with large shared memory segments shared between many processes come to mind as a real-world example of a worst case scenario. -- All Rights Reversed.
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