From nobody Thu Apr 2 23:16:44 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5271FC6FA8B for ; Tue, 20 Sep 2022 00:51:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229776AbiITAvR (ORCPT ); Mon, 19 Sep 2022 20:51:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54236 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229732AbiITAvN (ORCPT ); Mon, 19 Sep 2022 20:51:13 -0400 Received: from SHSQR01.spreadtrum.com (mx1.unisoc.com [222.66.158.135]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3BBD643310 for ; Mon, 19 Sep 2022 17:51:11 -0700 (PDT) Received: from SHSend.spreadtrum.com (bjmbx01.spreadtrum.com [10.0.64.7]) by SHSQR01.spreadtrum.com with ESMTPS id 28K0nMrm065312 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NO); Tue, 20 Sep 2022 08:49:22 +0800 (CST) (envelope-from zhaoyang.huang@unisoc.com) Received: from bj03382pcu.spreadtrum.com (10.0.74.65) by BJMBX01.spreadtrum.com (10.0.64.7) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Tue, 20 Sep 2022 08:49:21 +0800 From: "zhaoyang.huang" To: Mel Gorman , Andrew Morton , Zhaoyang Huang , , , Subject: [PATCHv2] mm: check high-order page when free it to pcp Date: Tue, 20 Sep 2022 08:49:00 +0800 Message-ID: <1663634940-6515-1-git-send-email-zhaoyang.huang@unisoc.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 X-Originating-IP: [10.0.74.65] X-ClientProxiedBy: SHCAS03.spreadtrum.com (10.0.1.207) To BJMBX01.spreadtrum.com (10.0.64.7) X-MAIL: SHSQR01.spreadtrum.com 28K0nMrm065312 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Zhaoyang Huang High-order pcp page escaped from checking when both of DEBUG_VM and debug_p= agealloc are all disabled if it allocated again from pcp_list without going to global free list, which should be introduced by 44042b4498. fix:44042b4498 Signed-off-by: Zhaoyang Huang --- changes of v2: update comments --- --- mm/page_alloc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index e008a3d..b54976d 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1412,7 +1412,7 @@ static __always_inline bool free_pages_prepare(struct= page *page, =20 #ifdef CONFIG_DEBUG_VM /* - * With DEBUG_VM enabled, order-0 pages are checked immediately when being= freed + * With DEBUG_VM enabled, pages are checked immediately when being freed * to pcp lists. With debug_pagealloc also enabled, they are also rechecke= d when * moved from pcp lists to free lists. */ @@ -1430,14 +1430,14 @@ static bool bulkfree_pcp_prepare(struct page *page) } #else /* - * With DEBUG_VM disabled, order-0 pages being freed are checked only when + * With DEBUG_VM disabled, pages being freed are checked only when * moving from pcp lists to free list in order to reduce overhead. With * debug_pagealloc enabled, they are checked also immediately when being f= reed * to the pcp lists. */ static bool free_pcp_prepare(struct page *page, unsigned int order) { - if (debug_pagealloc_enabled_static()) + if (debug_pagealloc_enabled_static() || order) return free_pages_prepare(page, order, true, FPI_NONE); else return free_pages_prepare(page, order, false, FPI_NONE); --=20 1.9.1