On 14 Jan 2022, at 8:38, David Hildenbrand wrote: > On 05.01.22 22:47, Zi Yan wrote: >> From: Zi Yan <ziy@xxxxxxxxxx> >> >> Enable set_migratetype_isolate() to check specified sub-range for >> unmovable pages during isolation. Page isolation is done >> at max(MAX_ORDER_NR_PAEGS, pageblock_nr_pages) granularity, but not all >> pages within that granularity are intended to be isolated. For example, >> alloc_contig_range(), which uses page isolation, allows ranges without >> alignment. This commit makes unmovable page check only look for >> interesting pages, so that page isolation can succeed for any >> non-overlapping ranges. > > Are you handling if we start checking in the middle of a compound page > and actually have to lookup the head to figure out if movable or not? > Yes. has_unmovable_pages() has that check already. >> >> has_unmovable_pages() is moved to mm/page_isolation.c since it is only >> used by page isolation. > > Please move that into a separate patch upfront, makes this patch much > easier to review. Sure. Will do. Thanks. -- Best Regards, Yan, Zi
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