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Wed, 25 Feb 2026 08:34:52 -0800 (PST) Date: Wed, 25 Feb 2026 16:34:37 +0000 In-Reply-To: <20260225-page_alloc-unmapped-v1-0-e8808a03cd66@google.com> Mime-Version: 1.0 References: <20260225-page_alloc-unmapped-v1-0-e8808a03cd66@google.com> X-Mailer: b4 0.14.3 Message-ID: <20260225-page_alloc-unmapped-v1-12-e8808a03cd66@google.com> Subject: [PATCH RFC 12/19] mm: encode freetype flags in pageblock flags From: Brendan Jackman To: Borislav Petkov , Dave Hansen , Peter Zijlstra , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , Vlastimil Babka , Wei Xu , Johannes Weiner , Zi Yan 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-Queue-Id: 3B2DD40004 X-Rspamd-Server: rspam02 X-Stat-Signature: tr935zngesycrjixhbibz1xt6jpm6fqw X-HE-Tag: 1772037293-338138 X-HE-Meta: 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 rdTOPHTT 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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 9635433c7d711..b79f81b64d9d7 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -392,11 +392,8 @@ 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); @@ -469,9 +466,20 @@ __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); } /** @@ -605,6 +613,15 @@ 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) @@ -628,7 +645,7 @@ 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