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Thu, 09 Jul 2026 00:39:08 -0700 (PDT) Received: from mi-OptiPlex-7060.mioffice.cn ([43.224.245.234]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-ca5b3162a49sm3334902a12.15.2026.07.09.00.39.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Jul 2026 00:39:07 -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, "Barry Song (Xiaomi)" , Wen Jiang , Xueyuan Chen , Leo Yan Subject: [PATCH v6 6/6] mm/vmalloc: align vm_area so vmap() can batch mappings Date: Thu, 9 Jul 2026 15:38:23 +0800 Message-Id: <20260709073823.6643-7-jiangwen6@xiaomi.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260709073823.6643-1-jiangwen6@xiaomi.com> References: <20260709073823.6643-1-jiangwen6@xiaomi.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260709_003909_231728_27A70EC1 X-CRM114-Status: GOOD ( 13.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: "Barry Song (Xiaomi)" Try to align the vmap virtual address to PMD_SHIFT or a larger PTE mapping size hinted by the architecture, so contiguous pages can be batch-mapped when setting PMD or PTE entries. We do not expect any significant overhead for this. Add __get_vm_area_node_aligned_caller() as a wrapper over __get_vm_area_node() to simplify repeated calls with fixed arguments. Signed-off-by: Barry Song (Xiaomi) Signed-off-by: Wen Jiang Tested-by: Xueyuan Chen Tested-by: Leo Yan Reviewed-by: Uladzislau Rezki (Sony) --- mm/vmalloc.c | 35 ++++++++++++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index db0492151ad08..2ac805cdf18ad 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -3314,6 +3314,14 @@ struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags, NUMA_NO_NODE, GFP_KERNEL, caller); } +static struct vm_struct *__get_vm_area_node_aligned_caller(unsigned long size, + unsigned long align, unsigned long flags, const void *caller) +{ + return __get_vm_area_node(size, align, PAGE_SHIFT, flags, + VMALLOC_START, VMALLOC_END, + NUMA_NO_NODE, GFP_KERNEL, caller); +} + /** * find_vm_area - find a continuous kernel virtual area * @addr: base address @@ -3626,6 +3634,30 @@ static int vmap_pages_range_batched(unsigned long addr, unsigned long end, return err; } +static struct vm_struct *vmap_get_aligned_vm_area(unsigned long size, + unsigned long flags, pgprot_t prot, const void *caller) +{ + struct vm_struct *vm_area; + unsigned int shift; + + if (arch_vmap_pmd_supported(prot) && size >= PMD_SIZE) { + vm_area = __get_vm_area_node_aligned_caller(size, PMD_SIZE, + flags, caller); + if (vm_area) + return vm_area; + } + + shift = arch_vmap_pte_supported_shift(size); + if (shift > PAGE_SHIFT) { + vm_area = __get_vm_area_node_aligned_caller(size, 1UL << shift, + flags, caller); + if (vm_area) + return vm_area; + } + + return __get_vm_area_node_aligned_caller(size, PAGE_SIZE, flags, caller); +} + /** * vmap - map an array of pages into virtually contiguous space * @pages: array of page pointers @@ -3664,7 +3696,8 @@ void *vmap(struct page **pages, unsigned int count, return NULL; size = (unsigned long)count << PAGE_SHIFT; - area = get_vm_area_caller(size, flags, __builtin_return_address(0)); + area = vmap_get_aligned_vm_area(size, flags, prot, + __builtin_return_address(0)); if (!area) return NULL; -- 2.34.1