From: Wen Jiang <jiangwenxiaomi@gmail.com>
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 <jiangwen6@xiaomi.com>,
Xueyuan Chen <xueyuan.chen21@gmail.com>
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 [thread overview]
Message-ID: <20260514094108.2016201-8-jiangwen6@xiaomi.com> (raw)
In-Reply-To: <20260514094108.2016201-1-jiangwen6@xiaomi.com>
From: "Barry Song (Xiaomi)" <baohua@kernel.org>
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) <baohua@kernel.org>
Signed-off-by: Wen Jiang <jiangwen6@xiaomi.com>
Tested-by: Xueyuan Chen <xueyuan.chen21@gmail.com>
---
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
prev parent reply other threads:[~2026-05-14 9:42 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-14 9:41 [PATCH v2 0/7] mm/vmalloc: Speed up ioremap, vmalloc and vmap with contiguous memory Wen Jiang
2026-05-14 9:41 ` [PATCH v2 1/7] arm64/hugetlb: Extend batching of multiple CONT_PTE in a single PTE setup Wen Jiang
2026-05-14 9:41 ` [PATCH v2 2/7] arm64/vmalloc: Allow arch_vmap_pte_range_map_size to batch multiple CONT_PTE Wen Jiang
2026-05-14 9:41 ` [PATCH v2 3/7] mm/vmalloc: Extract vmap_set_ptes() to consolidate PTE mapping logic Wen Jiang
2026-05-14 9:41 ` [PATCH v2 4/7] mm/vmalloc: Extend page table walk to support larger page_shift sizes and eliminate page table rewalk Wen Jiang
2026-05-14 9:41 ` [PATCH v2 5/7] mm/vmalloc: map contiguous pages in batches for vmap() if possible Wen Jiang
2026-05-14 9:41 ` [PATCH v2 6/7] mm/vmalloc: align vm_area so vmap() can batch mappings Wen Jiang
2026-05-14 9:41 ` Wen Jiang [this message]
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