On 2024/12/7 5:20, Shakeel Butt wrote: > On Fri, Dec 06, 2024 at 12:24:54AM -0800, Hugh Dickins wrote: > [...] >> Another thing to understand: it's called before adding folio to list, >> but after removing folio from list: when it can usefully compare whether >> the emptiness of the list correctly matches lru_size 0. > > I think one source of confusion might be that this "emptiness" check has > been removed by commit b4536f0c829c because of maintaining the list size > per-zone and actual list is shared between zones of a node. > Agree. Maybe it doesn't have to distinguish between "size > 0" and "size < 0" now? Thanks, Ridong >> It cannot do so >> when adding if you "simplify" it in the way that you did. >>
