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Wed, 15 Jul 2026 05:08:27 -0700 (PDT) From: Wen Jiang X-Google-Original-From: Wen Jiang To: akpm@linux-foundation.org, catalin.marinas@arm.com, linux-mm@kvack.org, urezki@gmail.com, will@kernel.org Cc: Xueyuan.chen21@gmail.com, ajd@linux.ibm.com, anshuman.khandual@arm.com, david@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, rppt@kernel.org, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, Wen Jiang , Xueyuan Chen , Leo Yan Subject: [PATCH v7 1/7] arm64/hugetlb: Extend batching of multiple CONT_PTE in a single PTE setup Date: Wed, 15 Jul 2026 20:08:07 +0800 Message-Id: <20260715120813.3609949-2-jiangwen6@xiaomi.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260715120813.3609949-1-jiangwen6@xiaomi.com> References: <20260715120813.3609949-1-jiangwen6@xiaomi.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: "Barry Song (Xiaomi)" For sizes aligned to CONT_PTE_SIZE and smaller than PMD_SIZE, we can handle CONT_PTE_SIZE groups together. These additional sizes are mapping spans used by non-hugetlbfs(vmalloc) mm code, not new HugeTLB hstate sizes. Signed-off-by: Barry Song (Xiaomi) Signed-off-by: Wen Jiang Tested-by: Xueyuan Chen Tested-by: Leo Yan Reviewed-by: Dev Jain --- arch/arm64/mm/hugetlbpage.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index a42c05cf56408..7ce159483a354 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -94,6 +94,11 @@ static int find_num_contig(struct mm_struct *mm, unsigned long addr, return CONT_PTES; } +/* + * num_contig_ptes(), set_huge_pte_at() and arch_make_huge_pte() can be + * used by non-hugetlbfs(vmalloc) mm code to set multiple huge mappings + * at the PTE level. + */ static inline int num_contig_ptes(unsigned long size, size_t *pgsize) { int contig_ptes = 1; @@ -110,6 +115,12 @@ static inline int num_contig_ptes(unsigned long size, size_t *pgsize) contig_ptes = CONT_PTES; break; default: + if (size > 0 && size < PMD_SIZE && + IS_ALIGNED(size, CONT_PTE_SIZE)) { + *pgsize = PAGE_SIZE; + contig_ptes = size >> PAGE_SHIFT; + break; + } WARN_ON(!__hugetlb_valid_size(size)); } @@ -359,6 +370,10 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags) case CONT_PTE_SIZE: return pte_mkcont(entry); default: + if (pagesize > 0 && pagesize < PMD_SIZE && + IS_ALIGNED(pagesize, CONT_PTE_SIZE)) + return pte_mkcont(entry); + break; } pr_warn("%s: unrecognized huge page size 0x%lx\n", -- 2.34.1