From patchwork Thu Apr 22 10:36:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vasily Averin X-Patchwork-Id: 426186 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=-15.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_SANE_1 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 18F0BC433ED for ; Thu, 22 Apr 2021 10:36:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DB72F61450 for ; Thu, 22 Apr 2021 10:36:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235988AbhDVKh0 (ORCPT ); Thu, 22 Apr 2021 06:37:26 -0400 Received: from relay.sw.ru ([185.231.240.75]:33480 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236008AbhDVKhY (ORCPT ); Thu, 22 Apr 2021 06:37:24 -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=SkoUid64jfWnCkxDzH08xkMfbWx02U1lgMhR2hvrunE=; b=M0ytvzFU20jfoZ0ah// n2t+nSFQEXAqq/EilM0XSd2D69FoejlXb3IVllJE64fjgW8EjmbKbRI4ppZsBiL73Gk7KhakdAH5c aP9DdEyWeOKvMASwItUuaws0+RAmeZLARy80CHodyqALO0T0UZB/F0d3w2BqKgZP2SxY9fR6d+g= Received: from [10.93.0.56] by relay.sw.ru with esmtp (Exim 4.94) (envelope-from ) id 1lZWhU-001ALs-JX; Thu, 22 Apr 2021 13:36:48 +0300 From: Vasily Averin Subject: [PATCH v3 06/16] memcg: enable accounting for scm_fp_list objects To: cgroups@vger.kernel.org, Michal Hocko , Shakeel Butt , Johannes Weiner , Vladimir Davydov Cc: Roman Gushchin , "David S. Miller" , Jakub Kicinski , netdev@vger.kernel.org References: Message-ID: <9b82c165-5138-3c03-4a1d-1f16bd8416ef@virtuozzo.com> Date: Thu, 22 Apr 2021 13:36:48 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: netdev@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 8156d4f..e837e4f 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; @@ -348,7 +348,7 @@ 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]);