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[173.79.60.52]) by smtp.gmail.com with ESMTPSA id af79cd13be357-93a2d4514c7sm155963085a.28.2026.09.14.08.51.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Sep 2026 08:51:18 -0700 (PDT) From: Gregory Price To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, akpm@linux-foundation.org, vbabka@kernel.org, surenb@google.com, mhocko@suse.com, brendan.jackman@linux.dev, hannes@cmpxchg.org, ziy@nvidia.com, david@kernel.org, ljs@kernel.org, liam@infradead.org, rppt@kernel.org, baolin.wang@linux.alibaba.com, nico.pache@linux.dev, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, usama.arif@linux.dev, kas@kernel.org, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, apopple@nvidia.com Subject: [PATCH] mm/page_alloc: let the bulk and folio allocators carry alloc_flags Date: Mon, 14 Sep 2026 11:51:14 -0400 Message-ID: <20260914155115.439742-1-gourry@gourry.net> X-Mailer: git-send-email 2.55.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 834B780004 X-Stat-Signature: zqz5nkqbwgpoh8gsfh535axjqp98qzgm X-Rspam-User: X-HE-Tag: 1789401079-537770 X-HE-Meta: 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 8toRm2o5 RIL7J0jFKU7HOGU9TgIu3RdtEOOYaN8pNxkRYZpqlAVhue6xsPYVGTMC8JBdlH8E3woHhKrr0aaa2g4iB3C/4yKyhr5cJFHwOtOHKE1XM8ug5wF1HYL+AtU15/7DL/6Oa/6sKngLmHclTlRqXg/pl+pQEm145c3khAofDjYVp1oN371PFawdchyRVaCcCtEN1HJYVuZYl4CN5r/q0aUp709oeNyeoh6utZ1HpBJ1aw2+g/rDS1AUwcw329a/hHBtxmjGYRs3ZzTqFOIJZJL1tMdpQ+QJG4mCXLrpYEjlc2Zx3AFyLuPPT5Np5vrB949p9IzzF5Jr9c3eRL7ohImi1b+/t3/kIZHyAtsmQy0fyjZgEmaX1G3IYpEn/gKlT/aBqcWxrSwqr2PGdpCXX/GY/fFEYKgG+huMkSfs6B00vSv9Agv33ehiYmnfjP4ZKvTuCzpms10GEnC/k1PkW0iB1noS+4g== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: __alloc_pages_noprof() takes an explicit alloc_flags, but the bulk and folio entry points do not, so callers cannot select allocator behaviour (e.g. an alternate zonelist) through them. Thread alloc_flags through both, matching __alloc_pages_noprof(), and keep the flag-carrying primitives mm-internal (page_alloc.h) so the public gfp.h wrappers stay flag-free: - add __alloc_pages_bulk_noprof(gfp, ..., alloc_flags) in page_alloc.h alloc_pages_bulk_noprof() becomes a wrapper passing ALLOC_DEFAULT - give __folio_alloc_noprof() an alloc_flags parameter and moves __folio_alloc_node_noprof() moves into page_alloc.h __folio_alloc_noprof() is no longer exported No functional change: every caller passes ALLOC_DEFAULT. Cc: Brendan Jackman Signed-off-by: Gregory Price --- Brendan this will conflict mildly with your ALLOC_UNMAPPED work, because you add an init_alloc_flags call in alloc_pages_bulk_noprof : https://lore.kernel.org/linux-mm/20260726-page_alloc-unmapped-v3-20-6f5729aa9832@google.com/ I wanted to pull this out ahead to try to deal with the conflict. include/linux/gfp.h | 13 +------------ mm/khugepaged.c | 2 +- mm/migrate.c | 2 +- mm/page_alloc.c | 46 ++++++++++++++++++++++++++++++--------------- mm/page_alloc.h | 8 ++++++++ 5 files changed, 42 insertions(+), 29 deletions(-) diff --git a/include/linux/gfp.h b/include/linux/gfp.h index 872bc53f32ec..a327e58c313f 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -204,10 +204,6 @@ static inline void arch_free_page(struct page *page, int order) { } static inline void arch_alloc_page(struct page *page, int order) { } #endif -struct folio *__folio_alloc_noprof(gfp_t gfp, unsigned int order, int preferred_nid, - nodemask_t *nodemask); -#define __folio_alloc(...) alloc_hooks(__folio_alloc_noprof(__VA_ARGS__)) - unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid, nodemask_t *nodemask, int nr_pages, struct page **page_array); @@ -252,14 +248,7 @@ static inline void warn_if_node_offline(int this_node, gfp_t gfp_mask) dump_stack(); } -static inline -struct folio *__folio_alloc_node_noprof(gfp_t gfp, unsigned int order, int nid) -{ - warn_if_node_offline(nid, gfp); - - return __folio_alloc_noprof(gfp, order, nid, NULL); -} - +struct folio *__folio_alloc_node_noprof(gfp_t gfp, unsigned int order, int nid); #define __folio_alloc_node(...) alloc_hooks(__folio_alloc_node_noprof(__VA_ARGS__)) /* diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 0d8cd44b14c5..431c2e610b39 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1193,7 +1193,7 @@ static enum scan_result alloc_charge_folio(struct folio **foliop, struct mm_stru int node = collapse_find_target_node(cc); struct folio *folio; - folio = __folio_alloc(gfp, order, node, &cc->alloc_nmask); + folio = __folio_alloc(gfp, order, node, &cc->alloc_nmask, ALLOC_DEFAULT); if (!folio) { *foliop = NULL; count_collapse_event(order, THP_COLLAPSE_ALLOC_FAILED, diff --git a/mm/migrate.c b/mm/migrate.c index 7e3a81f06974..8e1c25a6f750 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2229,7 +2229,7 @@ struct folio *alloc_migration_target(struct folio *src, unsigned long private) if (is_highmem_idx(zidx) || zidx == ZONE_MOVABLE) gfp_mask |= __GFP_HIGHMEM; - return __folio_alloc(gfp_mask, order, nid, mtc->nmask); + return __folio_alloc(gfp_mask, order, nid, mtc->nmask, ALLOC_DEFAULT); } #ifdef CONFIG_NUMA_MIGRATION diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d977b8bf7245..f4ceec8cf77e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5151,8 +5151,8 @@ static inline bool prepare_alloc_pages(gfp_t gfp_mask, unsigned int order, * @page_array were set to %NULL on entry, the slots from 0 to the return value * - 1 will be filled. */ -unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid, - nodemask_t *nodemask, int nr_pages, +unsigned long __alloc_pages_bulk_noprof(gfp_t gfp, unsigned int alloc_flags, + int preferred_nid, nodemask_t *nodemask, int nr_pages, struct page **page_array) { struct page *page; @@ -5160,8 +5160,8 @@ unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid, struct zoneref *z; struct per_cpu_pages *pcp; struct list_head *pcp_list; - struct alloc_context ac; - unsigned int alloc_flags = ALLOC_WMARK_LOW; + struct alloc_context ac = { .alloc_flags = alloc_flags }; + unsigned int fastpath_alloc_flags = alloc_flags | ALLOC_WMARK_LOW; int nr_populated = 0, nr_account = 0; /* @@ -5202,7 +5202,7 @@ unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid, /* May set ALLOC_NOFRAGMENT, fragmentation will return 1 page. */ gfp &= gfp_allowed_mask; gfp = current_gfp_context(gfp); - if (!prepare_alloc_pages(gfp, 0, preferred_nid, nodemask, &ac, &gfp, &alloc_flags)) + if (!prepare_alloc_pages(gfp, 0, preferred_nid, nodemask, &ac, &gfp, &fastpath_alloc_flags)) goto out; /* Find an allowed local zone that meets the low watermark. */ @@ -5210,7 +5210,7 @@ unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid, for_next_zone_zonelist_nodemask(zone, z, ac.highest_zoneidx, ac.nodemask) { unsigned long mark; - if (cpusets_enabled() && (alloc_flags & ALLOC_CPUSET) && + if (cpusets_enabled() && (fastpath_alloc_flags & ALLOC_CPUSET) && !__cpuset_zone_allowed(zone, gfp)) { continue; } @@ -5220,16 +5220,17 @@ unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid, goto failed; } - cond_accept_memory(zone, 0, alloc_flags); + cond_accept_memory(zone, 0, fastpath_alloc_flags); retry_this_zone: - mark = wmark_pages(zone, alloc_flags & ALLOC_WMARK_MASK) + nr_pages - nr_populated; + mark = wmark_pages(zone, fastpath_alloc_flags & ALLOC_WMARK_MASK) + + nr_pages - nr_populated; if (zone_watermark_fast(zone, 0, mark, zonelist_zone_idx(ac.preferred_zoneref), - alloc_flags, gfp)) { + fastpath_alloc_flags, gfp)) { break; } - if (cond_accept_memory(zone, 0, alloc_flags)) + if (cond_accept_memory(zone, 0, fastpath_alloc_flags)) goto retry_this_zone; /* Try again if zone has deferred pages */ @@ -5261,7 +5262,7 @@ unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid, continue; } - page = __rmqueue_pcplist(zone, 0, ac.migratetype, alloc_flags, + page = __rmqueue_pcplist(zone, 0, ac.migratetype, fastpath_alloc_flags, pcp, pcp_list); if (unlikely(!page)) { /* Try and allocate at least one page */ @@ -5289,11 +5290,19 @@ unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid, return nr_populated; failed: - page = __alloc_pages_noprof(gfp, 0, preferred_nid, nodemask, ALLOC_DEFAULT); + page = __alloc_pages_noprof(gfp, 0, preferred_nid, nodemask, alloc_flags); if (page) page_array[nr_populated++] = page; goto out; } + +unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid, + nodemask_t *nodemask, int nr_pages, + struct page **page_array) +{ + return __alloc_pages_bulk_noprof(gfp, ALLOC_DEFAULT, preferred_nid, + nodemask, nr_pages, page_array); +} EXPORT_SYMBOL_GPL(alloc_pages_bulk_noprof); /* @@ -5484,13 +5493,20 @@ struct page *alloc_pages_node_noprof(int nid, gfp_t gfp_mask, unsigned int order EXPORT_SYMBOL(alloc_pages_node_noprof); struct folio *__folio_alloc_noprof(gfp_t gfp, unsigned int order, int preferred_nid, - nodemask_t *nodemask) + nodemask_t *nodemask, unsigned int alloc_flags) { struct page *page = __alloc_pages_noprof(gfp | __GFP_COMP, order, - preferred_nid, nodemask, ALLOC_DEFAULT); + preferred_nid, nodemask, alloc_flags); return page_rmappable_folio(page); } -EXPORT_SYMBOL(__folio_alloc_noprof); + +struct folio *__folio_alloc_node_noprof(gfp_t gfp, unsigned int order, int nid) +{ + warn_if_node_offline(nid, gfp); + + return __folio_alloc_noprof(gfp, order, nid, NULL, ALLOC_DEFAULT); +} +EXPORT_SYMBOL(__folio_alloc_node_noprof); /* * Common helper functions. Never use with __GFP_HIGHMEM because the returned diff --git a/mm/page_alloc.h b/mm/page_alloc.h index b9259deddb59..23fc79ce97b6 100644 --- a/mm/page_alloc.h +++ b/mm/page_alloc.h @@ -258,6 +258,14 @@ struct page *__alloc_pages_noprof(gfp_t gfp, unsigned int order, int preferred_n nodemask_t *nodemask, unsigned int alloc_flags); #define __alloc_pages(...) alloc_hooks(__alloc_pages_noprof(__VA_ARGS__)) +struct folio *__folio_alloc_noprof(gfp_t gfp, unsigned int order, int preferred_nid, + nodemask_t *nodemask, unsigned int alloc_flags); +#define __folio_alloc(...) alloc_hooks(__folio_alloc_noprof(__VA_ARGS__)) + +unsigned long __alloc_pages_bulk_noprof(gfp_t gfp, unsigned int alloc_flags, + int preferred_nid, nodemask_t *nodemask, int nr_pages, + struct page **page_array); + extern void zone_pcp_reset(struct zone *zone); extern void zone_pcp_disable(struct zone *zone); extern void zone_pcp_enable(struct zone *zone); -- 2.55.0