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,URIBL_BLOCKED, 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 DB0A7C4338F for ; Mon, 26 Jul 2021 19:01:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C357D60F6E for ; Mon, 26 Jul 2021 19:01:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233535AbhGZSVN (ORCPT ); Mon, 26 Jul 2021 14:21:13 -0400 Received: from relay.sw.ru ([185.231.240.75]:55252 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233069AbhGZSU2 (ORCPT ); Mon, 26 Jul 2021 14:20:28 -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=7c123YSCTdMincmxsUMhI0gcAR3i6drsKgalA/feMPM=; b=OM1ywa0FINzPxgssHvz uMeln3xNmKRwTBX5ClBVDs1ebLGKCE56jvO/HAux6oHnIrCaJWgLnTiuTzMF6Pywq3KJHpcvF7ydW 683QCNaK+qJ5+s1W1RTYWTBQ94DOQSpYYyg85LjkeWAcD8oawmr1o7apPCiyf0wCWSt3ScUXqyY=; Received: from [10.93.0.56] by relay.sw.ru with esmtp (Exim 4.94.2) (envelope-from ) id 1m85qR-005JUj-27; Mon, 26 Jul 2021 22:00:55 +0300 From: Vasily Averin Subject: [PATCH v6 08/16] memcg: enable accounting for pollfd and select bits arrays To: Andrew Morton Cc: cgroups@vger.kernel.org, Michal Hocko , Shakeel Butt , Johannes Weiner , Vladimir Davydov , Roman Gushchin , Alexander Viro , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org References: <9bf9d9bd-03b1-2adb-17b4-5d59a86a9394@virtuozzo.com> Message-ID: Date: Mon, 26 Jul 2021 22:00:54 +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 User can call select/poll system calls with a large number of assigned file descriptors and force kernel to allocate up to several pages of memory till end of these sleeping system calls. We have here long-living unaccounted per-task allocations. It makes sense to account for these allocations to restrict the host's memory consumption from inside the memcg-limited container. Signed-off-by: Vasily Averin --- fs/select.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/select.c b/fs/select.c index 945896d..e83e563 100644 --- a/fs/select.c +++ b/fs/select.c @@ -655,7 +655,7 @@ int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp, goto out_nofds; alloc_size = 6 * size; - bits = kvmalloc(alloc_size, GFP_KERNEL); + bits = kvmalloc(alloc_size, GFP_KERNEL_ACCOUNT); if (!bits) goto out_nofds; } @@ -1000,7 +1000,7 @@ static int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds, len = min(todo, POLLFD_PER_PAGE); walk = walk->next = kmalloc(struct_size(walk, entries, len), - GFP_KERNEL); + GFP_KERNEL_ACCOUNT); if (!walk) { err = -ENOMEM; goto out_fds; -- 1.8.3.1