On Sun, 26 May 2019 14:23:53 +0800 Hillf Danton <hdanton@xxxxxxxx> wrote: > In the function isolate_lru_pages(), we check scan_control::may_unmap and set > isolation mode accordingly in order to not isolate from the lru list any page > that does not match the isolation mode. For example, we should skip all sill > mapped pages if isolation mode is set to be ISOLATE_UNMAPPED. > > So complain, while scanning the isolated pages, about the very unlikely event > that we hit a mapped page that we should never have isolated. Note no change > is added in the current scanning behavior without VM debug configured. The patch is inoffensive enough, but one wonders what inspired it. Do you have reason to believe that this will trigger?
