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=-7.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=no 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 724F8C433DF for ; Thu, 30 Jul 2020 21:26:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4B6452083E for ; Thu, 30 Jul 2020 21:26:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="GqZgB7xc" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731012AbgG3VZ4 (ORCPT ); Thu, 30 Jul 2020 17:25:56 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:17250 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730672AbgG3VXU (ORCPT ); Thu, 30 Jul 2020 17:23:20 -0400 Received: from pps.filterd (m0148460.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 06ULEoGB026397 for ; Thu, 30 Jul 2020 14:23:18 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding : content-type; s=facebook; bh=uM/CbB3u61KGIKkgXn+bc2q9njFLIQF3TmkjbVBY+fA=; b=GqZgB7xckcTNRBBL7SLDrtc/+/HhSddgNsF8l2YxfNe14ATjfX77PGI6eAozZ7Doqhlp pQiSDHqOGUYb2Ce/gj8LcagbYTHenDg/w0mFHERQV+qCbndBnw7ABPTW7aNRzXwVR8g1 Iyeu9+bnMgS9cF3MtriF12wQmfyYfCHGQcM= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 32jp0uvkb9-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 30 Jul 2020 14:23:18 -0700 Received: from intmgw004.06.prn3.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:11d::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Thu, 30 Jul 2020 14:23:16 -0700 Received: by devvm1096.prn0.facebook.com (Postfix, from userid 111017) id 92CA920B009A; Thu, 30 Jul 2020 14:23:12 -0700 (PDT) Smtp-Origin-Hostprefix: devvm From: Roman Gushchin Smtp-Origin-Hostname: devvm1096.prn0.facebook.com To: CC: , Alexei Starovoitov , Daniel Borkmann , , , Roman Gushchin Smtp-Origin-Cluster: prn0c01 Subject: [PATCH bpf-next v3 00/29] bpf: switch to memcg-based memory accounting Date: Thu, 30 Jul 2020 14:22:41 -0700 Message-ID: <20200730212310.2609108-1-guro@fb.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-07-30_15:2020-07-30,2020-07-30 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 lowpriorityscore=0 mlxscore=0 phishscore=0 priorityscore=1501 suspectscore=13 malwarescore=0 mlxlogscore=999 bulkscore=0 adultscore=0 impostorscore=0 spamscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007300150 X-FB-Internal: deliver Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Currently bpf is using the memlock rlimit for the memory accounting. This approach has its downsides and over time has created a significant amount of problems: 1) The limit is per-user, but because most bpf operations are performed as root, the limit has a little value. 2) It's hard to come up with a specific maximum value. Especially because the counter is shared with non-bpf users (e.g. memlock() users). Any specific value is either too low and creates false failures or too high and useless. 3) Charging is not connected to the actual memory allocation. Bpf code should manually calculate the estimated cost and precharge the counter= , and then take care of uncharging, including all fail paths. It adds to the code complexity and makes it easy to leak a charge. 4) There is no simple way of getting the current value of the counter. We've used drgn for it, but it's far from being convenient. 5) Cryptic -EPERM is returned on exceeding the limit. Libbpf even had a function to "explain" this case for users. In order to overcome these problems let's switch to the memcg-based memory accounting of bpf objects. With the recent addition of the percpu memory accounting, now it's possible to provide a comprehensive accountin= g of memory used by bpf programs and maps. This approach has the following advantages: 1) The limit is per-cgroup and hierarchical. It's way more flexible and a= llows a better control over memory usage by different workloads. 2) The actual memory consumption is taken into account. It happens automa= tically on the allocation time if __GFP_ACCOUNT flags is passed. Uncharging is= also performed automatically on releasing the memory. So the code on the bp= f side becomes simpler and safer. 3) There is a simple way to get the current value and statistics. The patchset consists of the following parts: 1) memcg-based accounting for various bpf objects: progs and maps 2) removal of the rlimit-based accounting 3) removal of rlimit adjustments in userspace samples v3: - droped the userspace part for further discussions/refinements, by Andrii and Song v2: - fixed build issue, caused by the remaining rlimit-based accounting for sockhash maps Roman Gushchin (29): bpf: memcg-based memory accounting for bpf progs bpf: memcg-based memory accounting for bpf maps bpf: refine memcg-based memory accounting for arraymap maps bpf: refine memcg-based memory accounting for cpumap maps bpf: memcg-based memory accounting for cgroup storage maps bpf: refine memcg-based memory accounting for devmap maps bpf: refine memcg-based memory accounting for hashtab maps bpf: memcg-based memory accounting for lpm_trie maps bpf: memcg-based memory accounting for bpf ringbuffer bpf: memcg-based memory accounting for socket storage maps bpf: refine memcg-based memory accounting for sockmap and sockhash maps bpf: refine memcg-based memory accounting for xskmap maps bpf: eliminate rlimit-based memory accounting for arraymap maps bpf: eliminate rlimit-based memory accounting for bpf_struct_ops maps bpf: eliminate rlimit-based memory accounting for cpumap maps bpf: eliminate rlimit-based memory accounting for cgroup storage maps bpf: eliminate rlimit-based memory accounting for devmap maps bpf: eliminate rlimit-based memory accounting for hashtab maps bpf: eliminate rlimit-based memory accounting for lpm_trie maps bpf: eliminate rlimit-based memory accounting for queue_stack_maps maps bpf: eliminate rlimit-based memory accounting for reuseport_array maps bpf: eliminate rlimit-based memory accounting for bpf ringbuffer bpf: eliminate rlimit-based memory accounting for sockmap and sockhash maps bpf: eliminate rlimit-based memory accounting for stackmap maps bpf: eliminate rlimit-based memory accounting for socket storage maps bpf: eliminate rlimit-based memory accounting for xskmap maps bpf: eliminate rlimit-based memory accounting infra for bpf maps bpf: eliminate rlimit-based memory accounting for bpf progs bpf: samples: do not touch RLIMIT_MEMLOCK include/linux/bpf.h | 23 --- kernel/bpf/arraymap.c | 30 +--- kernel/bpf/bpf_struct_ops.c | 19 +-- kernel/bpf/core.c | 20 +-- kernel/bpf/cpumap.c | 20 +-- kernel/bpf/devmap.c | 23 +-- kernel/bpf/hashtab.c | 33 +--- kernel/bpf/local_storage.c | 38 ++--- kernel/bpf/lpm_trie.c | 17 +- kernel/bpf/queue_stack_maps.c | 16 +- kernel/bpf/reuseport_array.c | 12 +- kernel/bpf/ringbuf.c | 33 ++-- kernel/bpf/stackmap.c | 16 +- kernel/bpf/syscall.c | 152 ++---------------- net/core/bpf_sk_storage.c | 23 +-- net/core/sock_map.c | 40 ++--- net/xdp/xskmap.c | 13 +- samples/bpf/map_perf_test_user.c | 11 -- samples/bpf/offwaketime_user.c | 2 - samples/bpf/sockex2_user.c | 2 - samples/bpf/sockex3_user.c | 2 - samples/bpf/spintest_user.c | 2 - samples/bpf/syscall_tp_user.c | 2 - samples/bpf/task_fd_query_user.c | 5 - samples/bpf/test_lru_dist.c | 3 - samples/bpf/test_map_in_map_user.c | 9 -- samples/bpf/test_overhead_user.c | 2 - samples/bpf/trace_event_user.c | 2 - samples/bpf/tracex2_user.c | 6 - samples/bpf/tracex3_user.c | 6 - samples/bpf/tracex4_user.c | 6 - samples/bpf/tracex5_user.c | 3 - samples/bpf/tracex6_user.c | 3 - samples/bpf/xdp1_user.c | 6 - samples/bpf/xdp_adjust_tail_user.c | 6 - samples/bpf/xdp_monitor_user.c | 6 - samples/bpf/xdp_redirect_cpu_user.c | 6 - samples/bpf/xdp_redirect_map_user.c | 6 - samples/bpf/xdp_redirect_user.c | 6 - samples/bpf/xdp_router_ipv4_user.c | 6 - samples/bpf/xdp_rxq_info_user.c | 6 - samples/bpf/xdp_sample_pkts_user.c | 6 - samples/bpf/xdp_tx_iptunnel_user.c | 6 - samples/bpf/xdpsock_user.c | 7 - .../selftests/bpf/progs/map_ptr_kern.c | 5 - 45 files changed, 94 insertions(+), 572 deletions(-) --=20 2.26.2