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Instead, if hugepage migration is enabled= , >> consider regions with hugepages smaller than the requested allocation.= >> >> Compaction `isolate_migrate_pages_block()` already expects requests > > isolate_migratepages_block() ? > >> with hugepages to originate from alloc_contig, and hugetlb code also >> does a migratable check when isolating in `folio_isolate_hugetlb()`. >> >> Suggested-by: David Hildenbrand >> Signed-off-by: Gregory Price >> --- >> mm/page_alloc.c | 15 +++++++++++++-- >> 1 file changed, 13 insertions(+), 2 deletions(-) >> >> diff --git a/mm/page_alloc.c b/mm/page_alloc.c >> index 600d9e981c23..da2e65bf63e3 100644 >> --- a/mm/page_alloc.c >> +++ b/mm/page_alloc.c >> @@ -7048,8 +7048,19 @@ static bool pfn_range_valid_contig(struct zone = *z, unsigned long start_pfn, >> if (PageReserved(page)) >> return false; >> >> - if (PageHuge(page)) >> - return false; >> + if (PageHuge(page)) { >> + unsigned int order; >> + >> + if (!IS_ENABLED(CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION)) >> + return false; >> + >> + /* Don't consider moving same size/larger pages */ >> + page =3D compound_head(page); >> + order =3D compound_order(page); > > How about using folio_large_order(page_folio(page)) ? See the discussion at https://lore.kernel.org/linux-mm/609E7E01-33A6-4931= -AC89-1F4B2944FB64@nvidia.com/ about reading folio order without locking.= > >> + if ((order >=3D MAX_PAGE_ORDER) || >> + (nr_pages < (1 << order))) >> + return false; >> + } >> } >> return true; >> } >> -- = >> 2.51.0 >> > > Generally LGTM > > Reviewed-by: Wei Yang > > -- = > Wei Yang > Help you, Help me -- Best Regards, Yan, Zi