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=-3.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,URIBL_BLOCKED autolearn=no 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 CC129C433B4 for ; Thu, 1 Apr 2021 10:52:01 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D388F61005 for ; Thu, 1 Apr 2021 10:52:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D388F61005 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=e16-tech.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4F0AC6B0080; Thu, 1 Apr 2021 06:52:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4A0D76B0081; Thu, 1 Apr 2021 06:52:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 38F776B0082; Thu, 1 Apr 2021 06:52:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0180.hostedemail.com [216.40.44.180]) by kanga.kvack.org (Postfix) with ESMTP id 194C46B0080 for ; Thu, 1 Apr 2021 06:52:00 -0400 (EDT) Received: from smtpin34.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id C05166D7D for ; Thu, 1 Apr 2021 10:51:59 +0000 (UTC) X-FDA: 77983483158.34.21A7A12 Received: from out20-13.mail.aliyun.com (out20-13.mail.aliyun.com [115.124.20.13]) by imf14.hostedemail.com (Postfix) with ESMTP id 3144EC0007C4 for ; Thu, 1 Apr 2021 10:51:55 +0000 (UTC) X-Alimail-AntiSpam:AC=CONTINUE;BC=0.08421896|-1;CH=green;DM=|CONTINUE|false|;DS=CONTINUE|ham_social|0.0122037-0.000305347-0.987491;FP=13048134200189174910|1|1|1|0|-1|-1|-1;HT=ay29a033018047211;MF=wangyugui@e16-tech.com;NM=1;PH=DS;RN=1;RT=1;SR=0;TI=SMTPD_---.Jtbbrtm_1617274313; Received: from 192.168.2.112(mailfrom:wangyugui@e16-tech.com fp:SMTPD_---.Jtbbrtm_1617274313) by smtp.aliyun-inc.com(10.147.41.199); Thu, 01 Apr 2021 18:51:53 +0800 Date: Thu, 01 Apr 2021 18:51:59 +0800 From: Wang Yugui To: linux-mm@kvack.org Subject: unexpected -ENOMEM from percpu_counter_init() Message-Id: <20210401185158.3275.409509F4@e16-tech.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.75.03 [en] X-Rspamd-Queue-Id: 3144EC0007C4 X-Stat-Signature: h311bj63sshxtk6j76k1duuciq85yo97 X-Rspamd-Server: rspam02 Received-SPF: none (e16-tech.com>: No applicable sender policy available) receiver=imf14; identity=mailfrom; envelope-from=""; helo=out20-13.mail.aliyun.com; client-ip=115.124.20.13 X-HE-DKIM-Result: none/none X-HE-Tag: 1617274315-729442 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: Hi, an unexpected -ENOMEM from percpu_counter_init() happened when xfstest with kernel 5.11.10 and 5.10.27 direct caller: int btrfs_drew_lock_init(struct btrfs_drew_lock *lock) { int ret; ret = percpu_counter_init(&lock->writers, 0, GFP_KERNEL); if (ret) return ret; atomic_set(&lock->readers, 0); init_waitqueue_head(&lock->pending_readers); init_waitqueue_head(&lock->pending_writers); return 0; } upper caller: nofs_flag = memalloc_nofs_save(); ret = btrfs_drew_lock_init(&root->snapshot_lock); memalloc_nofs_restore(nofs_flag); if (ret == -ENOMEM) printk("ENOMEM btrfs_drew_lock_init\n"); if (ret) goto fail; The hardware of this server: CPU: Xeon(R) CPU E5-2660 v2(10 core) *2 memory: 192G, no swap Only one xfstests job is running in this server, and about 7% of memory is used. Any advice please. Best Regards Wang Yugui (wangyugui@e16-tech.com) 2021/04/01