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Thu, 14 May 2026 02:42:13 -0700 (PDT) From: Wen Jiang X-Google-Original-From: Wen Jiang To: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, will@kernel.org, akpm@linux-foundation.org, urezki@gmail.com Cc: baohua@kernel.org, Xueyuan.chen21@gmail.com, dev.jain@arm.com, rppt@kernel.org, david@kernel.org, ryan.roberts@arm.com, anshuman.khandual@arm.com, ajd@linux.ibm.com, linux-kernel@vger.kernel.org, Wen Jiang , Xueyuan Chen Subject: [PATCH v2 7/7] mm/vmalloc: Stop scanning for compound pages after encountering small pages in vmap Date: Thu, 14 May 2026 17:41:08 +0800 Message-Id: <20260514094108.2016201-8-jiangwen6@xiaomi.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260514094108.2016201-1-jiangwen6@xiaomi.com> References: <20260514094108.2016201-1-jiangwen6@xiaomi.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: "Barry Song (Xiaomi)" Users typically allocate memory in descending orders, e.g. 8 → 4 → 0. Once an order-0 page is encountered, subsequent pages are likely to also be order-0, so we stop scanning for compound pages at that point. Signed-off-by: Barry Song (Xiaomi) Signed-off-by: Wen Jiang Tested-by: Xueyuan Chen --- mm/vmalloc.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index b3389c8f1..60579bfbf 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -3576,6 +3576,12 @@ static int __vmap_huge(unsigned long addr, unsigned long end, map_addr = addr; idx = i; } + /* + * Once small pages are encountered, the remaining pages + * are likely small as well + */ + if (shift == PAGE_SHIFT) + break; addr += 1UL << shift; i += 1U << (shift - PAGE_SHIFT); -- 2.34.1