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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 57493C433E6 for ; Wed, 17 Feb 2021 21:42:00 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 07BA16186A for ; Wed, 17 Feb 2021 21:41:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 07BA16186A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 242EA8D0003; Wed, 17 Feb 2021 16:41:59 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 1F5FA8D0001; Wed, 17 Feb 2021 16:41:59 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F3C2A8D0003; Wed, 17 Feb 2021 16:41:58 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0019.hostedemail.com [216.40.44.19]) by kanga.kvack.org (Postfix) with ESMTP id DE2D38D0001 for ; Wed, 17 Feb 2021 16:41:58 -0500 (EST) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id A6A1B18481CB6 for ; Wed, 17 Feb 2021 21:41:58 +0000 (UTC) X-FDA: 77829082716.13.C4CB1C6 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by imf09.hostedemail.com (Postfix) with ESMTP id 25F69600249C for ; Wed, 17 Feb 2021 21:41:54 +0000 (UTC) IronPort-SDR: rzLMIAB/XrG/gu5pGuHOB2m9vgEpxkt2GZgEjVeIzPmzTeuJrqo4QpZJxPuwrIrdSa1xn6f16M xQWtwQeTJUZA== X-IronPort-AV: E=McAfee;i="6000,8403,9898"; a="182538764" X-IronPort-AV: E=Sophos;i="5.81,185,1610438400"; d="scan'208";a="182538764" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Feb 2021 13:41:57 -0800 IronPort-SDR: fyXWGY+qTbQbuVmeCtCGViaNOmO5KLB9GCktnf6sqEPS4OOLdfqg8pm8qyxyXHVzxofdAq+crC i8lmAP2b6Ivw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,185,1610438400"; d="scan'208";a="401430721" Received: from skl-02.jf.intel.com ([10.54.74.28]) by orsmga007.jf.intel.com with ESMTP; 17 Feb 2021 13:41:57 -0800 From: Tim Chen To: Andrew Morton , Johannes Weiner , Michal Hocko , Vladimir Davydov Cc: Tim Chen , Dave Hansen , Ying Huang , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/3] mm: Fix missing mem cgroup soft limit tree updates Date: Wed, 17 Feb 2021 12:41:36 -0800 Message-Id: X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 25F69600249C X-Stat-Signature: n91t3bfex1bbr1kcqhhx5pzwrnqd7oy8 Received-SPF: none (linux.intel.com>: No applicable sender policy available) receiver=imf09; identity=mailfrom; envelope-from=""; helo=mga14.intel.com; client-ip=192.55.52.115 X-HE-DKIM-Result: none/none X-HE-Tag: 1613598114-115184 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On a per node basis, the mem cgroup soft limit tree on each node tracks how much a cgroup has exceeded its soft limit memory limit and sorts the cgroup by its excess usage. On page release, the trees are not updated right away, until we have gathered a batch of pages belonging to the same cgroup. This reduces the frequency of updating the soft limit tr= ee and locking of the tree and associated cgroup. However, the batch of pages could contain pages from multiple nodes but only the soft limit tree from one node would get updated. Change the logic so that we update the tree in batch of pages, with each batch of pages all in the same mem cgroup and memory node. An update is issued fo= r the batch of pages of a node collected till now whenever we encounter a page belonging to a different node. Note that this batching for the same node logic is only relevant for v1 cgroup that has a memory soft limit. Reviewed-by: Ying Huang Signed-off-by: Tim Chen --- mm/memcontrol.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index d72449eeb85a..8bddee75f5cb 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -6804,6 +6804,7 @@ struct uncharge_gather { unsigned long pgpgout; unsigned long nr_kmem; struct page *dummy_page; + int nid; }; =20 static inline void uncharge_gather_clear(struct uncharge_gather *ug) @@ -6849,7 +6850,13 @@ static void uncharge_page(struct page *page, struc= t uncharge_gather *ug) * exclusive access to the page. */ =20 - if (ug->memcg !=3D page_memcg(page)) { + if (ug->memcg !=3D page_memcg(page) || + /* + * Update soft limit tree used in v1 cgroup in page batch for + * the same node. Relevant only to v1 cgroup with a soft limit. + */ + (ug->dummy_page && ug->nid !=3D page_to_nid(page) && + ug->memcg->soft_limit !=3D PAGE_COUNTER_MAX)) { if (ug->memcg) { uncharge_batch(ug); uncharge_gather_clear(ug); @@ -6869,6 +6876,7 @@ static void uncharge_page(struct page *page, struct= uncharge_gather *ug) ug->pgpgout++; =20 ug->dummy_page =3D page; + ug->nid =3D page_to_nid(page); page->memcg_data =3D 0; css_put(&ug->memcg->css); } --=20 2.20.1