From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6412A105D99B for ; Wed, 8 Apr 2026 02:52:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=BdliaBWbk2rOoeYorTgFI+4+mXZ4Qg922zWKCCJqJeI=; b=4PyDPhAi23XwkVI94TjI8jd2in rC42y0HA1d4UiRvc9ByTfhNmj1hfpeVz8ZT1Ej2L7r6RvjLIme93wjkPbFq9OJZwhKgeAPYt4u20/ N8Etm5xB3rcWesY2ZHpR3OCK6K/EzK5vk/wSPExq0CsK87GgpDqI0K/YEA7Xv4bKEhwUZ/BKqHOnD KhuV8QxPuOtXLs7F8jsit5h2mk6BqWQCHh+I8bEhJYVbZch/agVaAWCxfeD2inEPOlzFbavGSvldM wkEBTZr0VizjvJAom6UpAoF1r2ZUm/IxqOp9ySaP95wYmrWSkAlIX9Uc295t2R+EowR7j40U7g9RE WJKMHCkQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wAJ1M-000000089P8-3wBH; Wed, 08 Apr 2026 02:52:00 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wAJ1K-000000089Lw-2ouL for linux-arm-kernel@lists.infradead.org; Wed, 08 Apr 2026 02:51:59 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 62FCA444E6; Wed, 8 Apr 2026 02:51:58 +0000 (UTC) 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> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260407_195158_738777_1A608687 X-CRM114-Status: UNSURE ( 8.50 ) X-CRM114-Notice: Please train this message. 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 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)