From patchwork Tue Feb 9 20:29:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tim Chen X-Patchwork-Id: 12079245 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=-16.8 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 18967C433E0 for ; Tue, 9 Feb 2021 21:30:42 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7B4DE64E92 for ; Tue, 9 Feb 2021 21:30:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7B4DE64E92 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 06E806B006E; Tue, 9 Feb 2021 16:30:41 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 01D516B0070; Tue, 9 Feb 2021 16:30:40 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D8E8C6B0071; Tue, 9 Feb 2021 16:30:40 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0252.hostedemail.com [216.40.44.252]) by kanga.kvack.org (Postfix) with ESMTP id C4D886B006E for ; Tue, 9 Feb 2021 16:30:40 -0500 (EST) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 928B0185B45C2 for ; Tue, 9 Feb 2021 21:30:40 +0000 (UTC) X-FDA: 77800023840.24.teeth65_50145162760a Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin24.hostedemail.com (Postfix) with ESMTP id 7AC7E1A4A0 for ; Tue, 9 Feb 2021 21:30:40 +0000 (UTC) X-HE-Tag: teeth65_50145162760a X-Filterd-Recvd-Size: 3244 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by imf02.hostedemail.com (Postfix) with ESMTP for ; Tue, 9 Feb 2021 21:30:39 +0000 (UTC) IronPort-SDR: nu961lzokw8359bjKvqo9YrnknYAYVxyJ6uWTLkMO+oebsTcM+4ujNuytQn5sYr4X94DBEi02T Indrv25dsktA== X-IronPort-AV: E=McAfee;i="6000,8403,9890"; a="182029397" X-IronPort-AV: E=Sophos;i="5.81,166,1610438400"; d="scan'208";a="182029397" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Feb 2021 13:30:34 -0800 IronPort-SDR: LudR3XWil918DSthPWyyBqoO8EWHAOIRC8WyvaRhVpXmHic1CIkS6jcfhCD68569+SMYdn4DS/ xKcXcqLESlDQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,166,1610438400"; d="scan'208";a="361953013" Received: from skl-02.jf.intel.com ([10.54.74.28]) by orsmga006.jf.intel.com with ESMTP; 09 Feb 2021 13:30:34 -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 1/3] mm: Fix dropped memcg from mem cgroup soft limit tree Date: Tue, 9 Feb 2021 12:29:45 -0800 Message-Id: X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 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: During soft limit memory reclaim, we will temporarily remove the target mem cgroup from the cgroup soft limit tree. We then perform memory reclaim, update the memory usage excess count and re-insert the mem cgroup back into the mem cgroup soft limit tree according to the new memory usage excess count. However, when memory reclaim failed for a maximum number of attempts and we bail out of the reclaim loop, we forgot to put the target mem cgroup chosen for next reclaim back to the soft limit tree. This prevented pages in the mem cgroup from being reclaimed in the future even though the mem cgroup exceeded its soft limit. Fix the logic and put the mem cgroup back on the tree when page reclaim failed for the mem cgroup. Reviewed-by: Ying Huang Signed-off-by: Tim Chen Acked-by: Michal Hocko --- mm/memcontrol.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index ed5cc78a8dbf..a51bf90732cb 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3505,8 +3505,12 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, loop > MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS)) break; } while (!nr_reclaimed); - if (next_mz) + if (next_mz) { + spin_lock_irq(&mctz->lock); + __mem_cgroup_insert_exceeded(next_mz, mctz, excess); + spin_unlock_irq(&mctz->lock); css_put(&next_mz->memcg->css); + } return nr_reclaimed; }