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In theory, it is possible, since when a MIGRATED_ISOLATE page= is freed, >>>> __free_one_page() can find its buddy and add the freed page to its b= uddy's >>>> buddy_list without performing a merge like current code. But it need= s a new >>>> code path in __add_to_free_list(), since it is not added to the head= nor the >>>> tail of a free list. >>> >>> But what if the whole pageblock gets freed in a single shot (IOW, the= re is no buddy to lookup the list for?). >> > > And thinking about it, another problem is if a page gets freed that has= no buddies. > >> You are right. This means when MIGRATE_ISOLATE is removed, the global >> MIGRATE_ISOLATE free list stays. > > Right. We could just have that one separately from the existing array. Yep, struct free_area { struct list_head free_list[MIGRATE_TYPES]; struct list_head isolate_list; unsigned long nr_free; }; -- Best Regards, Yan, Zi