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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT 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 6B6D5C65BAE for ; Mon, 3 Dec 2018 08:01:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3D9E42081C for ; Mon, 3 Dec 2018 08:01:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3D9E42081C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.alibaba.com 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 S1725990AbeLCIBh (ORCPT ); Mon, 3 Dec 2018 03:01:37 -0500 Received: from out30-132.freemail.mail.aliyun.com ([115.124.30.132]:35541 "EHLO out30-132.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725904AbeLCIBg (ORCPT ); Mon, 3 Dec 2018 03:01:36 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R201e4;CH=green;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01f04428;MF=xlpang@linux.alibaba.com;NM=1;PH=DS;RN=5;SR=0;TI=SMTPD_---0TEitRAJ_1543824080; Received: from localhost(mailfrom:xlpang@linux.alibaba.com fp:SMTPD_---0TEitRAJ_1543824080) by smtp.aliyun-inc.com(127.0.0.1); Mon, 03 Dec 2018 16:01:20 +0800 From: Xunlei Pang To: Michal Hocko , Roman Gushchin , Johannes Weiner Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 2/3] mm/vmscan: Enable kswapd to reclaim low-protected memory Date: Mon, 3 Dec 2018 16:01:18 +0800 Message-Id: <20181203080119.18989-2-xlpang@linux.alibaba.com> X-Mailer: git-send-email 2.14.4.44.g2045bb6 In-Reply-To: <20181203080119.18989-1-xlpang@linux.alibaba.com> References: <20181203080119.18989-1-xlpang@linux.alibaba.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There may be cgroup memory overcommitment, it will become even common in the future. Let's enable kswapd to reclaim low-protected memory in case of memory pressure, to mitigate the global direct reclaim pressures which could cause jitters to the response time of lantency-sensitive groups. Signed-off-by: Xunlei Pang --- mm/vmscan.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/mm/vmscan.c b/mm/vmscan.c index 62ac0c488624..3d412eb91f73 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3531,6 +3531,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) count_vm_event(PAGEOUTRUN); +retry: do { unsigned long nr_reclaimed = sc.nr_reclaimed; bool raise_priority = true; @@ -3622,6 +3623,13 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) sc.priority--; } while (sc.priority >= 1); + if (!sc.nr_reclaimed && sc.memcg_low_skipped) { + sc.priority = DEF_PRIORITY; + sc.memcg_low_reclaim = 1; + sc.memcg_low_skipped = 0; + goto retry; + } + if (!sc.nr_reclaimed) pgdat->kswapd_failures++; -- 2.13.5 (Apple Git-94)