From: "Barry Song (Xiaomi)" <baohua@kernel•org>
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: linux-kernel@vger•kernel.org, anshuman.khandual@arm•com,
ryan.roberts@arm•com, ajd@linux•ibm.com, rppt@kernel•org,
david@kernel•org, Xueyuan.chen21@gmail•com,
"Barry Song (Xiaomi)" <baohua@kernel•org>
Subject: [RFC PATCH 8/8] mm/vmalloc: Stop scanning for compound pages after encountering small pages in vmap
Date: Wed, 8 Apr 2026 10:51:15 +0800 [thread overview]
Message-ID: <20260408025115.27368-9-baohua@kernel.org> (raw)
In-Reply-To: <20260408025115.27368-1-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>
---
mm/vmalloc.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 3c3b7217693a..242f4bc1379c 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -3577,6 +3577,12 @@ static int vmap_contig_pages_range(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);
--
2.39.3 (Apple Git-146)
next prev parent reply other threads:[~2026-04-08 2:52 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-08 2:51 [RFC PATCH 0/8] mm/vmalloc: Speed up ioremap, vmalloc and vmap with contiguous memory Barry Song (Xiaomi)
2026-04-08 2:51 ` [RFC PATCH 1/8] arm64/hugetlb: Extend batching of multiple CONT_PTE in a single PTE setup Barry Song (Xiaomi)
2026-04-08 10:32 ` Dev Jain
2026-04-08 11:00 ` Barry Song
2026-04-08 2:51 ` [RFC PATCH 2/8] arm64/vmalloc: Allow arch_vmap_pte_range_map_size to batch multiple CONT_PTE Barry Song (Xiaomi)
2026-04-08 2:51 ` [RFC PATCH 3/8] mm/vmalloc: Extend vmap_small_pages_range_noflush() to support larger page_shift sizes Barry Song (Xiaomi)
2026-04-08 11:08 ` Dev Jain
2026-04-08 21:29 ` Barry Song
2026-04-13 16:08 ` Mike Rapoport
2026-04-13 20:16 ` Barry Song
2026-04-08 2:51 ` [RFC PATCH 4/8] mm/vmalloc: Eliminate page table zigzag for huge vmalloc mappings Barry Song (Xiaomi)
2026-04-13 16:16 ` Mike Rapoport
2026-04-13 19:49 ` Barry Song
2026-04-08 2:51 ` [RFC PATCH 5/8] mm/vmalloc: map contiguous pages in batches for vmap() if possible Barry Song (Xiaomi)
2026-04-08 4:19 ` Dev Jain
2026-04-08 5:12 ` Barry Song
2026-04-08 11:22 ` Dev Jain
2026-04-08 14:03 ` Dev Jain
2026-04-08 21:54 ` Barry Song
2026-04-09 10:10 ` Dev Jain
2026-04-09 10:20 ` Uladzislau Rezki
2026-04-10 1:02 ` Barry Song
2026-04-13 19:23 ` David Hildenbrand (Arm)
2026-04-13 19:56 ` Barry Song
2026-04-08 2:51 ` [RFC PATCH 6/8] mm/vmalloc: align vm_area so vmap() can batch mappings Barry Song (Xiaomi)
2026-04-08 2:51 ` [RFC PATCH 7/8] mm/vmalloc: Coalesce same page_shift mappings in vmap to avoid pgtable zigzag Barry Song (Xiaomi)
2026-04-08 11:36 ` Dev Jain
2026-04-08 21:58 ` Barry Song
2026-04-08 2:51 ` Barry Song (Xiaomi) [this message]
2026-04-08 9:14 ` [RFC PATCH 0/8] mm/vmalloc: Speed up ioremap, vmalloc and vmap with contiguous memory Dev Jain
2026-04-08 10:51 ` Barry Song
2026-04-08 10:55 ` Dev Jain
2026-04-27 15:04 ` Dev Jain
2026-04-28 3:16 ` Barry Song
2026-04-28 4:14 ` Dev Jain
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