From nobody Wed Dec 17 15:10:06 2025 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 8AF0BC6FD18 for ; Wed, 19 Apr 2023 05:45:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231588AbjDSFmg (ORCPT ); Wed, 19 Apr 2023 01:42:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44084 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229633AbjDSFmb (ORCPT ); Wed, 19 Apr 2023 01:42:31 -0400 Received: from SHSQR01.spreadtrum.com (mx1.unisoc.com [222.66.158.135]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C16E440E7 for ; Tue, 18 Apr 2023 22:42:25 -0700 (PDT) Received: from SHSend.spreadtrum.com (bjmbx01.spreadtrum.com [10.0.64.7]) by SHSQR01.spreadtrum.com with ESMTP id 33J5ed12070031; Wed, 19 Apr 2023 13:40:39 +0800 (+08) (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; Wed, 19 Apr 2023 13:40:39 +0800 From: "zhaoyang.huang" To: Andrew Morton , , , Zhaoyang Huang , Subject: [PATCH] mm: skip CMA pages when they are not available Date: Wed, 19 Apr 2023 13:40:24 +0800 Message-ID: <1681882824-17532-1-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: SHCAS01.spreadtrum.com (10.0.1.201) To BJMBX01.spreadtrum.com (10.0.64.7) X-MAIL: SHSQR01.spreadtrum.com 33J5ed12070031 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 It is wasting of effort to reclaim CMA pages if they are not availabe for current context during direct reclaim. Skip them when under correspondi= ng circumstance. Signed-off-by: Zhaoyang Huang --- mm/vmscan.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index bd6637f..04424d9 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2225,10 +2225,16 @@ static unsigned long isolate_lru_folios(unsigned lo= ng nr_to_scan, unsigned long nr_skipped[MAX_NR_ZONES] =3D { 0, }; unsigned long skipped =3D 0; unsigned long scan, total_scan, nr_pages; + bool cma_cap =3D true; + struct page *page; LIST_HEAD(folios_skipped); =20 total_scan =3D 0; scan =3D 0; + if ((IS_ENABLED(CONFIG_CMA)) && !current_is_kswapd() + && (gfp_migratetype(sc->gfp_mask) !=3D MIGRATE_MOVABLE)) + cma_cap =3D false; + while (scan < nr_to_scan && !list_empty(src)) { struct list_head *move_to =3D src; struct folio *folio; @@ -2239,7 +2245,10 @@ static unsigned long isolate_lru_folios(unsigned lon= g nr_to_scan, nr_pages =3D folio_nr_pages(folio); total_scan +=3D nr_pages; =20 - if (folio_zonenum(folio) > sc->reclaim_idx) { + page =3D &folio->page; + + if (folio_zonenum(folio) > sc->reclaim_idx || + (get_pageblock_migratetype(page) =3D=3D MIGRATE_CMA && !cma_cap)) { nr_skipped[folio_zonenum(folio)] +=3D nr_pages; move_to =3D &folios_skipped; goto move; --=20 1.9.1