From patchwork Mon Mar 29 07:59:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 412575 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 EED28C43460 for ; Mon, 29 Mar 2021 08:29:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CC7FB619DF for ; Mon, 29 Mar 2021 08:29:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233149AbhC2I3a (ORCPT ); Mon, 29 Mar 2021 04:29:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:41832 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233749AbhC2I0z (ORCPT ); Mon, 29 Mar 2021 04:26:55 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id EA252619CA; Mon, 29 Mar 2021 08:25:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1617006353; bh=+bsrpx4cNVUktMcDSEJnM3RMt0AKF3D62/wDJ/q8e/Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=H3I9X7LKS1hjqqgzqKOHoqX0FmfCWaJa4gDX2naZ54vv6bSeWATZnGTPULxphQBa3 DCUtAsfV3/nkK9jcB7S1hkFk0dfDdpflGSyHRNeWPe2iMtArLSHNVVukRLid3KkApw Z5RYw2g9JrRwVlesjt8iubNetsmWDnrpJbV1JJ/M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hugh Dickins Subject: [PATCH 5.10 209/221] mm/memcg: fix 5.10 backport of splitting page memcg Date: Mon, 29 Mar 2021 09:59:00 +0200 Message-Id: <20210329075636.083883684@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210329075629.172032742@linuxfoundation.org> References: <20210329075629.172032742@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Hugh Dickins The straight backport of 5.12's e1baddf8475b ("mm/memcg: set memcg when splitting page") works fine in 5.11, but turned out to be wrong for 5.10: because that relies on a separate flag, which must also be set for the memcg to be recognized and uncharged and cleared when freeing. Fix that. Signed-off-by: Hugh Dickins Signed-off-by: Greg Kroah-Hartman --- mm/memcontrol.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3274,13 +3274,17 @@ void obj_cgroup_uncharge(struct obj_cgro void split_page_memcg(struct page *head, unsigned int nr) { struct mem_cgroup *memcg = head->mem_cgroup; + int kmemcg = PageKmemcg(head); int i; if (mem_cgroup_disabled() || !memcg) return; - for (i = 1; i < nr; i++) + for (i = 1; i < nr; i++) { head[i].mem_cgroup = memcg; + if (kmemcg) + __SetPageKmemcg(head + i); + } css_get_many(&memcg->css, nr - 1); }