On 8/27/2022 1:15 AM, Matthew Wilcox wrote: > On Fri, Aug 26, 2022 at 11:20:58AM +0800, Yin, Fengwei wrote: >> On 8/26/2022 2:46 AM, Matthew Wilcox wrote: >>> There's a number of ways of solving this. I'm interested in seeing >>> which one Minchan thinks is best. >> >> My understanding is: >> PageTransCompound() return false for compound page if THP is disabled >> in kernel config. Replacing PageTransCompound() with PageCompound() >> could work here. But for the long term, folio should be the answer. :). > > Yes, ultimately, isolate_lru_page() is going away as an interface > and one will have to call folio_isolate_lru(). But should > madvise_cold_or_pageout_pte_range() even be getting called for VMAs > which are mmaps of af_packet? can_madv_lru_vma() rules out a number > of different types of VMA; should it also be ruling out af_packet VMAs? > If so, how? Thanks a lot for the information which helps me to understand the real concern here. Regards Yin, Fengwei
