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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4CCD3C0044C for ; Thu, 1 Nov 2018 17:37:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 14ED52081B for ; Thu, 1 Nov 2018 17:37:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yandex-team.ru header.i=@yandex-team.ru header.b="cQ6nP1rq"; dkim=pass (1024-bit key) header.d=yandex-team.ru header.i=@yandex-team.ru header.b="YjQfs1/o" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 14ED52081B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=yandex-team.ru Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727879AbeKBClw (ORCPT ); Thu, 1 Nov 2018 22:41:52 -0400 Received: from forwardcorp1j.cmail.yandex.net ([5.255.227.105]:46920 "EHLO forwardcorp1j.cmail.yandex.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727726AbeKBClw (ORCPT ); Thu, 1 Nov 2018 22:41:52 -0400 Received: from mxbackcorp1o.mail.yandex.net (mxbackcorp1o.mail.yandex.net [IPv6:2a02:6b8:0:1a2d::301]) by forwardcorp1j.cmail.yandex.net (Yandex) with ESMTP id 3CDF92115A; Thu, 1 Nov 2018 20:37:54 +0300 (MSK) Received: from smtpcorp1p.mail.yandex.net (smtpcorp1p.mail.yandex.net [2a02:6b8:0:1472:2741:0:8b6:10]) by mxbackcorp1o.mail.yandex.net (nwsmtp/Yandex) with ESMTP id 9Eetnn9lym-br785SsF; Thu, 01 Nov 2018 20:37:54 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1541093874; bh=9NSKQD9TC6CWOvQJHMbTYziFeV12lZg9YoYRZ3Vv2jQ=; h=Subject:From:To:Date:Message-ID; b=cQ6nP1rqfCJuNrTHvm5j/it7y/lCJV9JrOxuiHnaMCWsbhlrr+VejkxJ5S/0nDbvs V0FGi5LWm46kPtrQvlWTxsT/GScMIDXY6x/IWWVozKjlVAsiB17F2LHoAUmjchpYRC 2ocHJrX0ZYmui+oCLVvHRZlXfxjNBIanM77f7gsQ= Received: from dynamic-red.dhcp.yndx.net (dynamic-red.dhcp.yndx.net [2a02:6b8:0:40c:2501:1cc0:44e4:e39a]) by smtpcorp1p.mail.yandex.net (nwsmtp/Yandex) with ESMTPSA id 2bn0JepsrD-brJ8svCg; Thu, 01 Nov 2018 20:37:53 +0300 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client certificate not present) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1541093873; bh=9NSKQD9TC6CWOvQJHMbTYziFeV12lZg9YoYRZ3Vv2jQ=; h=Subject:From:To:Date:Message-ID; b=YjQfs1/oojFxHwS1lXBorLFoxTAGLzobHNmKCP/+F440FQQq2Jpj6j5fk8UX/+CyH wFP4++cZNNp7Fxtecq/HagLwBnbYcIjni+T2HkTBS/OOzIo1bxdOSqty+xIKEJPz+h 9lvSL9inm3MHqUTUa737CDN2P9nDPbDWLssisC6M= Authentication-Results: smtpcorp1p.mail.yandex.net; dkim=pass header.i=@yandex-team.ru Subject: [PATCH RFC] mm: do not start node_reclaim for page order > MAX_ORDER From: Konstantin Khlebnikov To: linux-mm@kvack.org, Andrew Morton , Michal Hocko , linux-kernel@vger.kernel.org Date: Thu, 01 Nov 2018 20:37:52 +0300 Message-ID: <154109387197.925352.10499549042420271600.stgit@buzz> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Page allocator has check in __alloc_pages_slowpath() but nowdays there is earlier entry point into reclimer without such check: get_page_from_freelist() -> node_reclaim(). Signed-off-by: Konstantin Khlebnikov --- mm/vmscan.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/vmscan.c b/mm/vmscan.c index 62ac0c488624..52f672420f0b 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -4117,6 +4117,12 @@ int node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned int order) { int ret; + /* + * Do not scan if allocation will never succeed. + */ + if (order >= MAX_ORDER) + return NODE_RECLAIM_NOSCAN; + /* * Node reclaim reclaims unmapped file backed pages and * slab pages if we are over the defined limits.