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>> + >> + VM_WARN_ON_ONCE(!IS_ALIGNED(pfn, 1 << order)); >> + /* Caller removed page from freelist, buddy info cleared! */ >> + VM_WARN_ON_ONCE(PageBuddy(page)); >> + >> + if (order > pageblock_order) >> + order =3D pageblock_order; >> + >> + while (pfn !=3D end) { >> + int mt =3D get_pfnblock_migratetype(page, pfn); >> + >> + __free_one_page(page, pfn, zone, order, mt, fpi); >> + pfn +=3D 1 << order; >> + page =3D pfn_to_page(pfn); >> + } >> +} > > Hi, > > stumbling over this while digging through the code .... > >> + >> static void free_one_page(struct zone *zone, struct page *page, >> unsigned long pfn, unsigned int order, >> fpi_t fpi_flags) >> { >> unsigned long flags; >> - int migratetype; >> spin_lock_irqsave(&zone->lock, flags); >> - migratetype =3D get_pfnblock_migratetype(page, pfn); >> - __free_one_page(page, pfn, zone, order, migratetype, fpi_flags); > > This change is rather undesired: > > via __free_pages_core()->__free_pages_ok() we can easily end up here wi= th order=3DMAX_PAGE_ORDER. Do you have a concrete example? PMD THP on x86_64 is pageblock_order. We do not have PMD level mTHP yet. Any other possible source? > > What your new code will do is split this perfectly reasonable MAX_PAGE_= ORDER chunk via split_large_buddy() into pageblock-sized chunks, and let = the buddy merging logic undo our unnecessary splitting. > > Is there a way to avoid this and just process the whole MAX_PAGE_ORDER = chunk like we used to? Probably split_large_buddy() can check the migratetypes of the to-be-free= d page, if order > pageblock_order. If all migratetypes are the same, the p= age can be freed at MAX_PAGE_ORDER, otherwise pageblock_order. Best Regards, Yan, Zi