On Tue, Aug 9, 2022 at 11:16 AM Alex Zhu (Kernel) <alexlzhu@xxxxxx> wrote: > > > > OK, it is hard to tell what it looks like now. But the THPs on the > > deferred split list may be on the "low utilization split" list too? > > IIUC the major difference is to replace zero-filled subpage to special > > zero page, so you implemented another THP split function to handle it? > > > > Anyway the code should answer the most questions. > > They can indeed end up on both lists. This did have to be handled when > implementing the shrinker. > > We free the zero filled subpages, while modifying the existing split_huge_page() > function. Will follow up that change in another patch. FYI. This series does it: https://lore.kernel.org/r/20210731063938.1391602-1-yuzhao@xxxxxxxxxx/ And this one: https://lore.kernel.org/r/1635422215-99394-1-git-send-email-ningzhang@xxxxxxxxxxxxxxxxx/
