From patchwork Thu Nov 5 08:55:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Shi X-Patchwork-Id: 11883699 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9FD24921 for ; Thu, 5 Nov 2020 08:56:41 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6598D2073A for ; Thu, 5 Nov 2020 08:56:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6598D2073A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id BC5AA6B00B1; Thu, 5 Nov 2020 03:56:23 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id B2DE36B00B5; Thu, 5 Nov 2020 03:56:23 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7EC436B00B2; Thu, 5 Nov 2020 03:56:23 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0073.hostedemail.com [216.40.44.73]) by kanga.kvack.org (Postfix) with ESMTP id 37FFD6B00B3 for ; Thu, 5 Nov 2020 03:56:23 -0500 (EST) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id D3C8F583A for ; Thu, 5 Nov 2020 08:56:22 +0000 (UTC) X-FDA: 77449758204.01.loss39_4215c4f272c8 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin01.hostedemail.com (Postfix) with ESMTP id A6C6A1004C6DE for ; Thu, 5 Nov 2020 08:56:22 +0000 (UTC) X-Spam-Summary: 1,0,0,2a6ba52918f6507f,d41d8cd98f00b204,alex.shi@linux.alibaba.com,,RULES_HIT:41:355:379:541:800:960:973:988:989:1260:1261:1345:1359:1431:1437:1534:1541:1711:1714:1730:1747:1777:1792:2393:2559:2562:3138:3139:3140:3141:3142:3351:3870:3876:4321:5007:6261:6737:6738:7514:10004:11026:11473:11658:11914:12043:12048:12296:12297:12438:12555:12895:13069:13311:13357:13846:14096:14181:14384:14394:14721:14915:21060:21080:21450:21451:21627:21990:30054:30070,0,RBL:115.124.30.45:@linux.alibaba.com:.lbl8.mailshell.net-64.201.201.201 62.20.2.100;04yrz56mhjsz6t4w98f79kxytf8s7ypn1utoc89f1pkmyrrzhm1emfg9z5g6az4.k3zhsc7dh3wonprrtziasjdghf51iyfxhrjn3fepw79j4px4qxuj7szjsxjgqw5.q-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:69,LUA_SUMMARY:none X-HE-Tag: loss39_4215c4f272c8 X-Filterd-Recvd-Size: 2698 Received: from out30-45.freemail.mail.aliyun.com (out30-45.freemail.mail.aliyun.com [115.124.30.45]) by imf14.hostedemail.com (Postfix) with ESMTP for ; Thu, 5 Nov 2020 08:56:21 +0000 (UTC) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R661e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04400;MF=alex.shi@linux.alibaba.com;NM=1;PH=DS;RN=22;SR=0;TI=SMTPD_---0UEJC3Fv_1604566567; Received: from aliy80.localdomain(mailfrom:alex.shi@linux.alibaba.com fp:SMTPD_---0UEJC3Fv_1604566567) by smtp.aliyun-inc.com(127.0.0.1); Thu, 05 Nov 2020 16:56:11 +0800 From: Alex Shi To: akpm@linux-foundation.org, mgorman@techsingularity.net, tj@kernel.org, hughd@google.com, khlebnikov@yandex-team.ru, daniel.m.jordan@oracle.com, willy@infradead.org, hannes@cmpxchg.org, lkp@intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, shakeelb@google.com, iamjoonsoo.kim@lge.com, richard.weiyang@gmail.com, kirill@shutemov.name, alexander.duyck@gmail.com, rong.a.chen@intel.com, mhocko@suse.com, vdavydov.dev@gmail.com, shy828301@gmail.com Cc: Michal Hocko Subject: [PATCH v21 08/19] mm/memcg: add debug checking in lock_page_memcg Date: Thu, 5 Nov 2020 16:55:38 +0800 Message-Id: <1604566549-62481-9-git-send-email-alex.shi@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1604566549-62481-1-git-send-email-alex.shi@linux.alibaba.com> References: <1604566549-62481-1-git-send-email-alex.shi@linux.alibaba.com> 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: Add a debug checking in lock_page_memcg, then we could get alarm if anything wrong here. Suggested-by: Johannes Weiner Signed-off-by: Alex Shi Acked-by: Hugh Dickins Acked-by: Johannes Weiner Cc: Johannes Weiner Cc: Michal Hocko Cc: Vladimir Davydov Cc: Andrew Morton Cc: cgroups@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org --- mm/memcontrol.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index b2aa3b73ab82..157b745031a4 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2121,6 +2121,12 @@ struct mem_cgroup *lock_page_memcg(struct page *page) if (unlikely(!memcg)) return NULL; +#ifdef CONFIG_PROVE_LOCKING + local_irq_save(flags); + might_lock(&memcg->move_lock); + local_irq_restore(flags); +#endif + if (atomic_read(&memcg->moving_account) <= 0) return memcg;