Messages in this thread | | | Subject | Re: [PATCH v2 00/16] Multigenerational LRU Framework | From | Rik van Riel <> | Date | Wed, 14 Apr 2021 11:58:53 -0400 |
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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.
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