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=-17.2 required=3.0 tests=BAYES_00,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_SANE_1 autolearn=unavailable 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 B10E7C07E9D for ; Mon, 19 Jul 2021 10:45:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9763561006 for ; Mon, 19 Jul 2021 10:45:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236581AbhGSKE2 (ORCPT ); Mon, 19 Jul 2021 06:04:28 -0400 Received: from relay.sw.ru ([185.231.240.75]:44630 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236507AbhGSKES (ORCPT ); Mon, 19 Jul 2021 06:04:18 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=virtuozzo.com; s=relay; h=Content-Type:MIME-Version:Date:Message-ID:Subject :From; bh=UZrH4BVKP7hsH0Ef9AbThzsAu5M7Nu3PE7kKwMt/YWY=; b=XHVkIpI92bVaY20EHc5 GtWFwWzv6wl4oufrCaN5OCs1l6PwTbHZydRscCdAV8vZ9BpzdZnbzPstQYpTOMnvEtgB+zqcMpbO7 mopc2HiC1RqmEa2odgR7qj8iBG0JI03+3LIvcSyIkwfDCJlZuB5Xl+2BZMDK4aNvZOzfYPf4gOA=; Received: from [10.93.0.56] by relay.sw.ru with esmtp (Exim 4.94.2) (envelope-from ) id 1m5Qld-004ReZ-88; Mon, 19 Jul 2021 13:44:57 +0300 From: Vasily Averin Subject: [PATCH v5 06/16] memcg: enable accounting for scm_fp_list objects To: Andrew Morton Cc: cgroups@vger.kernel.org, Michal Hocko , Shakeel Butt , Johannes Weiner , Vladimir Davydov , Roman Gushchin , "David S. Miller" , Eric Dumazet , Jakub Kicinski , netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: Message-ID: <4fe78621-16a8-ebd9-d7f5-f13c52eb36ff@virtuozzo.com> Date: Mon, 19 Jul 2021 13:44:56 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org unix sockets allows to send file descriptors via SCM_RIGHTS type messages. Each such send call forces kernel to allocate up to 2Kb memory for struct scm_fp_list. It makes sense to account for them to restrict the host's memory consumption from inside the memcg-limited container. Signed-off-by: Vasily Averin --- net/core/scm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/core/scm.c b/net/core/scm.c index ae3085d..5c356f0 100644 --- a/net/core/scm.c +++ b/net/core/scm.c @@ -79,7 +79,7 @@ static int scm_fp_copy(struct cmsghdr *cmsg, struct scm_fp_list **fplp) if (!fpl) { - fpl = kmalloc(sizeof(struct scm_fp_list), GFP_KERNEL); + fpl = kmalloc(sizeof(struct scm_fp_list), GFP_KERNEL_ACCOUNT); if (!fpl) return -ENOMEM; *fplp = fpl; @@ -355,7 +355,7 @@ struct scm_fp_list *scm_fp_dup(struct scm_fp_list *fpl) return NULL; new_fpl = kmemdup(fpl, offsetof(struct scm_fp_list, fp[fpl->count]), - GFP_KERNEL); + GFP_KERNEL_ACCOUNT); if (new_fpl) { for (i = 0; i < fpl->count; i++) get_file(fpl->fp[i]); -- 1.8.3.1