From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 91847202C29 for ; Wed, 8 Apr 2026 02:51:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775616718; cv=none; b=TaFJh9s9CdSeomArkFHf5GXeUxCMmzWjFUthGYxmbxLdAhJqxAC4Gkp2E5OrYB+7XGIMy2C9qk2xAwX1Npr4aUCQJEA5kMzFG49HeHA/1qTVrtL9UIljFLBjkQjCpNYfu718Zi+LykDU6ckyVtjf4jb9jPsnUZer8ti2I/R44Mk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775616718; c=relaxed/simple; bh=4BDs5dW9zJtaGW/eXyIzqwPGAqrmR/Pere8PJG68bKA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=Cb1ctmHHpC0HaWxItI1XOFhoDtwY9MCl61NfhOsdfIEhA9oPrv3C+XM7tTtwKp59C8JIXsk7Z5d330R8UBevotYBmdcx0O4dExjt+G4qdFm2xTztE90YaJi673C/X7V+wTgSIuTfCifqoKowOvBZ545yb4wh7XLSqEdZ328uu94= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MnttrxLf; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MnttrxLf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86EBAC116C6; Wed, 8 Apr 2026 02:51:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775616718; bh=4BDs5dW9zJtaGW/eXyIzqwPGAqrmR/Pere8PJG68bKA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MnttrxLfgWIjceDLBrD7T6mxsHluWlpQuAnVSfvkfssMuGim5D3nMqUWysoDzrF8q Vg/d/PYq+g2PiJwuyJV53u9fAYWH/e9GDDETxM/1qujw7fSUU23VQ6Wt5AIjgy3h3J yA4pB9Y6m/4MjHSU2+Ord5ZwlDmOp41LGv5wDQVrRkX+48iVntSbaEiNZPpV95rzM0 o7dixtMLL6Sb4hxcCk7KqWMKwZ2KVNgYnuzXISDbFUU7y3Q4f6QgzSKahf/5r+Kenq XLy0p+dk34T72eWKhEMyJhjy1poxLFhIex1zBjGY2rYzoSZkAW6IIsHC/aG1QuLpjL F2hb+JBvyQPQQ== From: "Barry Song (Xiaomi)" 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)" 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 Message-Id: <20260408025115.27368-9-baohua@kernel.org> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20260408025115.27368-1-baohua@kernel.org> References: <20260408025115.27368-1-baohua@kernel.org> 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 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) --- 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)