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This is >>> particularly needed by KVM when using guest-memfd memory backends, where >>> the guest memory needs to be allocated according to the NUMA policy >>> specified by VMM. >>> >>> The existing non-mempolicy APIs remain unchanged and continue to use the >>> default allocation behavior. >>> >>> Signed-off-by: Shivansh Dhiman >>> Signed-off-by: Shivank Garg >> >> >> >>> --- a/mm/filemap.c >>> +++ b/mm/filemap.c >>> @@ -1001,11 +1001,17 @@ int filemap_add_folio(struct address_space *mapping, struct folio *folio, >>> EXPORT_SYMBOL_GPL(filemap_add_folio); >>> >>> #ifdef CONFIG_NUMA >>> -struct folio *filemap_alloc_folio_noprof(gfp_t gfp, unsigned int order) >>> +struct folio *filemap_alloc_folio_mpol_noprof(gfp_t gfp, unsigned int order, >>> + struct mempolicy *mpol) >>> { >>> int n; >>> struct folio *folio; >>> >>> + if (mpol) >>> + return folio_alloc_mpol_noprof(gfp, order, mpol, >>> + NO_INTERLEAVE_INDEX, > > Could we pass in the interleave index instead of hard-coding it? Good point. I'll modify this to allow passing the interleave index. > >>> + numa_node_id()); >>> + >>> if (cpuset_do_page_mem_spread()) { >>> unsigned int cpuset_mems_cookie; >>> do { >>> @@ -1018,6 +1024,12 @@ struct folio *filemap_alloc_folio_noprof(gfp_t gfp, unsigned int order) >>> } >>> return folio_alloc_noprof(gfp, order); >>> } >>> +EXPORT_SYMBOL(filemap_alloc_folio_mpol_noprof); >>> + >>> +struct folio *filemap_alloc_folio_noprof(gfp_t gfp, unsigned int order) >>> +{ >>> + return filemap_alloc_folio_mpol_noprof(gfp, order, NULL); >>> +} >>> EXPORT_SYMBOL(filemap_alloc_folio_noprof); >>> #endif >> >> Here it seems to me: >> >> - filemap_alloc_folio_noprof() could stay unchanged >> - filemap_alloc_folio_mpol_noprof() would >> - call folio_alloc_mpol_noprof() if (mpol) >> - call filemap_alloc_folio_noprof() otherwise >> >> The code would be a bit more clearly structured that way? >> > > I feel that the original proposal makes it clearer that for all filemap > folio allocations, if mpol is defined, anything to do with cpuset's page > spread is overridden. Just a slight preference though. I do also agree > that having filemap_alloc_folio_mpol_noprof() call > filemap_alloc_folio_noprof() would result in fewer changes. > Your proposed structure makes sense. I'll update the patch to add these suggestions in the next version. Thanks, Shivank >>> @@ -1881,11 +1893,12 @@ void *filemap_get_entry(struct address_space *mapping, pgoff_t index) >>> } >>> >>> /** >>> - * __filemap_get_folio - Find and get a reference to a folio. >>> + * __filemap_get_folio_mpol - Find and get a reference to a folio. >>> * @mapping: The address_space to search. >>> * @index: The page index. >>> * @fgp_flags: %FGP flags modify how the folio is returned. >>> * @gfp: Memory allocation flags to use if %FGP_CREAT is specified. >>> + * @mpol: The mempolicy to apply when allocating a new folio. >>> * >>> * Looks up the page cache entry at @mapping & @index. >>> * >>> @@ -1896,8 +1909,8 @@ void *filemap_get_entry(struct address_space *mapping, pgoff_t index) >>> * >>> * Return: The found folio or an ERR_PTR() otherwise. >>> */ >>> -struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index, >>> - fgf_t fgp_flags, gfp_t gfp) >>> +struct folio *__filemap_get_folio_mpol(struct address_space *mapping, pgoff_t index, >>> + fgf_t fgp_flags, gfp_t gfp, struct mempolicy *mpol) >>> { >>> struct folio *folio; >>> >>> @@ -1967,7 +1980,7 @@ struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index, >>> err = -ENOMEM; >>> if (order > min_order) >>> alloc_gfp |= __GFP_NORETRY | __GFP_NOWARN; >>> - folio = filemap_alloc_folio(alloc_gfp, order); >>> + folio = filemap_alloc_folio_mpol(alloc_gfp, order, mpol); >>> if (!folio) >>> continue; >>> >>> @@ -2003,6 +2016,13 @@ struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index, >>> folio_clear_dropbehind(folio); >>> return folio; >>> } >>> +EXPORT_SYMBOL(__filemap_get_folio_mpol); >>> + >>> +struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index, >>> + fgf_t fgp_flags, gfp_t gfp) >>> +{ >>> + return __filemap_get_folio_mpol(mapping, index, fgp_flags, gfp, NULL); >>> +} >>> EXPORT_SYMBOL(__filemap_get_folio); >>> >>> static inline struct folio *find_get_entry(struct xa_state *xas, pgoff_t max,