From nobody Wed Sep 17 21:04:42 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39BB3C4332F for ; Thu, 15 Dec 2022 09:20:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229911AbiLOJUS (ORCPT ); Thu, 15 Dec 2022 04:20:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58058 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229785AbiLOJUM (ORCPT ); Thu, 15 Dec 2022 04:20:12 -0500 Received: from mail-pj1-x1036.google.com (mail-pj1-x1036.google.com [IPv6:2607:f8b0:4864:20::1036]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 007733F04A for ; Thu, 15 Dec 2022 01:20:10 -0800 (PST) Received: by mail-pj1-x1036.google.com with SMTP id v13-20020a17090a6b0d00b00219c3be9830so2080626pjj.4 for ; Thu, 15 Dec 2022 01:20:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shopee.com; s=shopee.com; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=0Wu5pKKt/tYg5j4ptIlawG89Bmd9AY8kHRaAGqPqkAs=; b=QFKuTxlmPSvSiGvceKI4jRcxQaPyAjRxEIe0jeAsm9mJMiBq4DitPskSJWUUIb4B3w Smq+oC/Sz4TApQ7i4RMCOwudRKNzT/ErbL+9E8ebSRVa9h1nO25UAc4SIBSSFhssMpa1 Dun3NPFKzDk4ylkMUEPnMux4UJCxWM3rpzY8klpS57EKwJG15KH41hXr96Ojped9mj9S IKt3vhb7yUx46syZ8OB4D6Eiz7vxQvN2kF5HpaamIlywYdVBGiW234HXFT9RGq8DYvaS T8pIp7dw91J9GUx1aHr67DFfP+V6xKoqmakiltZ33fGFh6NaYmwwQ7At/x8CXsL3RXe4 w9KA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=0Wu5pKKt/tYg5j4ptIlawG89Bmd9AY8kHRaAGqPqkAs=; b=AiX7QgBwvgyqkeuRe7JobAbSG29Iy/NJBx6BET1KFydjkRfbH8NUCVGRjVo1cMXg0Z H54zGqrQLfQ6sM9Wt2eILsQRC0B4XQSUC48gCflnFR/5p4oRpulJN4dBXnRDcFuWNaUb GBecNrCZtr0ITJ2q1/rVsY2/uH8yVpw1Vb9mcA1Wj87SMbhOABOjPYCNXwIQzmUcBcA6 x8fiRRcgugQ25QAfawamADiOzl5OZbxFV0UASxGOv9IxWPzan0sCzhaFSYrBn0DU6IXQ cZAQXvYadLJ7rSME/sKkm8Bpvi9V+pBu7FwMdtWJBrfHPMHHcSMDKiC831WoJ25Wn/G2 MEHQ== X-Gm-Message-State: ANoB5plJ8Ya0DP6MvyvL6eAdeT1jThRruhj/jNKbkks3pqQ2mu2CWd2a 4vnAs3jWZhgIWBZYDvuomjezvA== X-Google-Smtp-Source: AA0mqf70RQs4sQ5MceUFw8rJq3Pan6mecsXIuJiWTtzNDL4Zj6BVMoEbSzC2IGLD52G5Dj5oAUME7Q== X-Received: by 2002:a17:903:4283:b0:189:7100:c50e with SMTP id ju3-20020a170903428300b001897100c50emr29499311plb.48.1671096010440; Thu, 15 Dec 2022 01:20:10 -0800 (PST) Received: from ubuntu-haifeng.default.svc.cluster.local ([101.127.248.173]) by smtp.gmail.com with ESMTPSA id n15-20020a170903110f00b00188f8badbcdsm3302643plh.137.2022.12.15.01.20.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Dec 2022 01:20:10 -0800 (PST) From: Haifeng Xu To: akpm@linux-foundation.org Cc: shakeelb@google.com, roman.gushchin@linux.dev, songmuchun@bytedance.com, hannes@cmpxchg.org, vbabka@suse.cz, willy@infradead.org, vasily.averin@linux.dev, linux-kernel@vger.kernel.org, Haifeng Xu Subject: [PATCH] mm/memcontrol: Skip root memcg in memcg_memory_event_mm Date: Thu, 15 Dec 2022 09:19:07 +0000 Message-Id: <20221215091907.763801-1-haifeng.xu@shopee.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The memory events aren't supported on root cgroup, so there is no need to account MEMCG_OOM_KILL on root memcg. Signed-off-by: Haifeng Xu --- include/linux/memcontrol.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 567f12323f55..09f75161a3bc 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1142,7 +1142,7 @@ static inline void memcg_memory_event_mm(struct mm_st= ruct *mm, =20 rcu_read_lock(); memcg =3D mem_cgroup_from_task(rcu_dereference(mm->owner)); - if (likely(memcg)) + if (likely(memcg && !mem_cgroup_is_root(memcg))) memcg_memory_event(memcg, event); rcu_read_unlock(); } --=20 2.25.1