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Fri, 20 Mar 2026 11:23:59 -0700 (PDT) Date: Fri, 20 Mar 2026 18:23:38 +0000 In-Reply-To: <20260320-page_alloc-unmapped-v2-0-28bf1bd54f41@google.com> Mime-Version: 1.0 References: <20260320-page_alloc-unmapped-v2-0-28bf1bd54f41@google.com> X-Mailer: b4 0.14.3 Message-ID: <20260320-page_alloc-unmapped-v2-14-28bf1bd54f41@google.com> Subject: [PATCH v2 14/22] mm: encode freetype flags in pageblock flags From: Brendan Jackman To: Borislav Petkov , Dave Hansen , Peter Zijlstra , Andrew Morton , David Hildenbrand , Vlastimil Babka , Wei Xu , Johannes Weiner , Zi Yan , Lorenzo Stoakes Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, rppt@kernel.org, Sumit Garg , derkling@google.com, reijiw@google.com, Will Deacon , rientjes@google.com, "Kalyazin, Nikita" , patrick.roy@linux.dev, "Itazuri, Takahiro" , Andy Lutomirski , David Kaplan , Thomas Gleixner , Brendan Jackman , Yosry Ahmed Content-Type: text/plain; charset="utf-8" X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: BE6172000D X-Stat-Signature: 3z1wunu5zou38mn9cssp1syam1ws615k X-HE-Tag: 1774031040-698784 X-HE-Meta: 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 IgV/qGlG 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: In preparation for implementing allocation from FREETYPE_UNMAPPED lists. Since it works nicely with the existing allocator logic, and also offers a simple way to amortize TLB flushing costs, __GFP_UNMAPPED will be implemented by changing mappings at pageblock granularity. Therefore, encode the mapping state in the pageblock flags. Also add the necessary logic to record this from a freetype, and reconstruct a freetype from the pageblock flags. Signed-off-by: Brendan Jackman --- include/linux/pageblock-flags.h | 10 ++++++++++ mm/page_alloc.c | 33 +++++++++++++++++++++++++-------- 2 files changed, 35 insertions(+), 8 deletions(-) diff --git a/include/linux/pageblock-flags.h b/include/linux/pageblock-flags.h index 9a6c3ea17684d..b634280050071 100644 --- a/include/linux/pageblock-flags.h +++ b/include/linux/pageblock-flags.h @@ -11,6 +11,8 @@ #ifndef PAGEBLOCK_FLAGS_H #define PAGEBLOCK_FLAGS_H +#include +#include #include /* Bit indices that affect a whole block of pages */ @@ -18,6 +20,9 @@ enum pageblock_bits { PB_migrate_0, PB_migrate_1, PB_migrate_2, + PB_freetype_flags, + PB_freetype_flags_end = PB_freetype_flags + NUM_FREETYPE_FLAGS - 1, + PB_compact_skip,/* If set the block is skipped by compaction */ #ifdef CONFIG_MEMORY_ISOLATION @@ -37,6 +42,7 @@ enum pageblock_bits { #define NR_PAGEBLOCK_BITS (roundup_pow_of_two(__NR_PAGEBLOCK_BITS)) #define PAGEBLOCK_MIGRATETYPE_MASK (BIT(PB_migrate_0)|BIT(PB_migrate_1)|BIT(PB_migrate_2)) +#define PAGEBLOCK_FREETYPE_FLAGS_MASK (((1 << NUM_FREETYPE_FLAGS) - 1) << PB_freetype_flags) #ifdef CONFIG_MEMORY_ISOLATION #define PAGEBLOCK_ISO_MASK BIT(PB_migrate_isolate) @@ -44,6 +50,10 @@ enum pageblock_bits { #define PAGEBLOCK_ISO_MASK 0 #endif +#define PAGEBLOCK_FREETYPE_MASK (PAGEBLOCK_MIGRATETYPE_MASK | \ + PAGEBLOCK_ISO_MASK | \ + PAGEBLOCK_FREETYPE_FLAGS_MASK) + #if defined(CONFIG_HUGETLB_PAGE) #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d16f7b7bdf282..994ddcb132aed 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -357,11 +357,8 @@ get_pfnblock_bitmap_bitidx(const struct page *page, unsigned long pfn, unsigned long *bitmap; unsigned long word_bitidx; -#ifdef CONFIG_MEMORY_ISOLATION - BUILD_BUG_ON(NR_PAGEBLOCK_BITS != 8); -#else - BUILD_BUG_ON(NR_PAGEBLOCK_BITS != 4); -#endif + /* NR_PAGEBLOCK_BITS must divide word size. */ + BUILD_BUG_ON(NR_PAGEBLOCK_BITS != 4 && NR_PAGEBLOCK_BITS != 8); BUILD_BUG_ON(__MIGRATE_TYPE_END > PAGEBLOCK_MIGRATETYPE_MASK); VM_BUG_ON_PAGE(!zone_spans_pfn(page_zone(page), pfn), page); @@ -434,9 +431,20 @@ __always_inline freetype_t __get_pfnblock_freetype(const struct page *page, unsigned long pfn, bool ignore_iso) { - int mt = get_pfnblock_migratetype(page, pfn); + unsigned long mask = PAGEBLOCK_FREETYPE_MASK; + enum migratetype migratetype; + unsigned int ft_flags; + unsigned long flags; - return migrate_to_freetype(mt, 0); + flags = __get_pfnblock_flags_mask(page, pfn, mask); + ft_flags = (flags & PAGEBLOCK_FREETYPE_FLAGS_MASK) >> PB_freetype_flags; + + migratetype = flags & PAGEBLOCK_MIGRATETYPE_MASK; +#ifdef CONFIG_MEMORY_ISOLATION + if (!ignore_iso && flags & BIT(PB_migrate_isolate)) + migratetype = MIGRATE_ISOLATE; +#endif + return migrate_to_freetype(migratetype, ft_flags); } /** @@ -570,6 +578,15 @@ static void set_pageblock_migratetype(struct page *page, PAGEBLOCK_MIGRATETYPE_MASK | PAGEBLOCK_ISO_MASK); } +static inline void set_pageblock_freetype_flags(struct page *page, + unsigned int ft_flags) +{ + unsigned int flags = ft_flags << PB_freetype_flags; + + __set_pfnblock_flags_mask(page, page_to_pfn(page), flags, + PAGEBLOCK_FREETYPE_FLAGS_MASK); +} + void __meminit init_pageblock_migratetype(struct page *page, enum migratetype migratetype, bool isolate) @@ -593,7 +610,7 @@ void __meminit init_pageblock_migratetype(struct page *page, flags |= BIT(PB_migrate_isolate); #endif __set_pfnblock_flags_mask(page, page_to_pfn(page), flags, - PAGEBLOCK_MIGRATETYPE_MASK | PAGEBLOCK_ISO_MASK); + PAGEBLOCK_FREETYPE_MASK); } #ifdef CONFIG_DEBUG_VM -- 2.51.2