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=-15.8 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 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 54E48C433EF for ; Thu, 2 Sep 2021 21:55:18 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0C86A610CF for ; Thu, 2 Sep 2021 21:55:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 0C86A610CF Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id A9B1D6B00ED; Thu, 2 Sep 2021 17:55:17 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A4B448D0001; Thu, 2 Sep 2021 17:55:17 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 939DF6B00EF; Thu, 2 Sep 2021 17:55:17 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0223.hostedemail.com [216.40.44.223]) by kanga.kvack.org (Postfix) with ESMTP id 81C726B00ED for ; Thu, 2 Sep 2021 17:55:17 -0400 (EDT) Received: from smtpin38.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 3DB8E1840B39F for ; Thu, 2 Sep 2021 21:55:17 +0000 (UTC) X-FDA: 78543989874.38.139A43C Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf21.hostedemail.com (Postfix) with ESMTP id E80B5D0272A3 for ; Thu, 2 Sep 2021 21:55:16 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 52F4160F12; Thu, 2 Sep 2021 21:55:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1630619716; bh=yY9exSmFSK+E64v77EEMKN2SwwOkjAO1lf/8VUVVzLI=; h=Date:From:To:Subject:In-Reply-To:From; b=YXeK4iS0kXFiXD7EZ3iQHjoC/chofVTMdCbFWCiTuKKOsCNvxEIYwuRDjiZendlwx uzouLoIu5PtKw84yn26t2yD1QX9j59xrjCr0HgW6Hn87B0ZVyHc6Y67EtRnZlgIeU3 svXqNHjARqGvSnXX8pgWrNPfEzb/3j2+c2QRdLcI= Date: Thu, 02 Sep 2021 14:55:14 -0700 From: Andrew Morton To: 0x7f454c46@gmail.com, adobriyan@gmail.com, akpm@linux-foundation.org, avagin@gmail.com, axboe@kernel.dk, bfields@fieldses.org, bp@alien8.de, bp@suse.de, christian.brauner@ubuntu.com, ebiederm@xmission.com, gregkh@linuxfoundation.org, guro@fb.com, hannes@cmpxchg.org, hpa@zytor.com, jirislaby@kernel.org, jlayton@kernel.org, ktkhai@virtuozzo.com, linux-mm@kvack.org, lizefan.x@bytedance.com, mhocko@kernel.org, mingo@redhat.com, mm-commits@vger.kernel.org, nglaive@gmail.com, oleg@redhat.com, serge@hallyn.com, shakeelb@google.com, tglx@linutronix.de, tj@kernel.org, torvalds@linux-foundation.org, vdavydov.dev@gmail.com, viro@zeniv.linux.org.uk, vvs@virtuozzo.com Subject: [patch 100/212] memcg: enable accounting for pollfd and select bits arrays Message-ID: <20210902215514.tEU6wFfLD%akpm@linux-foundation.org> In-Reply-To: <20210902144820.78957dff93d7bea620d55a89@linux-foundation.org> User-Agent: s-nail v14.8.16 Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=YXeK4iS0; spf=pass (imf21.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: E80B5D0272A3 X-Stat-Signature: fjhts6xkrkna8gchcp5eyo3iujs8a3hx X-HE-Tag: 1630619716-724022 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Vasily Averin Subject: memcg: enable accounting for pollfd and select bits arrays 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. Link: https://lkml.kernel.org/r/56e31cb5-6e1e-bdba-d7ca-be64b9842363@virtuozzo.com Signed-off-by: Vasily Averin Reviewed-by: Shakeel Butt Cc: Alexander Viro Cc: Alexey Dobriyan Cc: Andrei Vagin Cc: Borislav Petkov Cc: Borislav Petkov Cc: Christian Brauner Cc: Dmitry Safonov <0x7f454c46@gmail.com> Cc: "Eric W. Biederman" Cc: Greg Kroah-Hartman Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: "J. Bruce Fields" Cc: Jeff Layton Cc: Jens Axboe Cc: Jiri Slaby Cc: Johannes Weiner Cc: Kirill Tkhai Cc: Michal Hocko Cc: Oleg Nesterov Cc: Roman Gushchin Cc: Serge Hallyn Cc: Tejun Heo Cc: Thomas Gleixner Cc: Vladimir Davydov Cc: Yutian Yang Cc: Zefan Li Signed-off-by: Andrew Morton --- fs/select.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/fs/select.c~memcg-enable-accounting-for-pollfd-and-select-bits-arrays +++ a/fs/select.c @@ -655,7 +655,7 @@ int core_sys_select(int n, fd_set __user 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 __u 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; _