From patchwork Wed Jan 19 23:06:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Liu X-Patchwork-Id: 12717844 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9E5A8C433F5 for ; Wed, 19 Jan 2022 23:06:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239028AbiASXGg convert rfc822-to-8bit (ORCPT ); Wed, 19 Jan 2022 18:06:36 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:63722 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230289AbiASXGf (ORCPT ); Wed, 19 Jan 2022 18:06:35 -0500 Received: from pps.filterd (m0109333.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.1.2/8.16.1.2) with ESMTP id 20JIs6kF031096 for ; Wed, 19 Jan 2022 15:06:35 -0800 Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3dp197t7rv-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 19 Jan 2022 15:06:35 -0800 Received: from twshared0654.04.ash8.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:21d::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Wed, 19 Jan 2022 15:06:34 -0800 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id 9CAB328220C2F; Wed, 19 Jan 2022 15:06:25 -0800 (PST) From: Song Liu To: , , CC: , , , , , , Song Liu Subject: [PATCH v4 bpf-next 0/7] bpf_prog_pack allocator Date: Wed, 19 Jan 2022 15:06:13 -0800 Message-ID: <20220119230620.3137425-1-song@kernel.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: hfYEWJNcjkNqihNptmVpQ41dpIutDhAN X-Proofpoint-GUID: hfYEWJNcjkNqihNptmVpQ41dpIutDhAN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-01-19_12,2022-01-19_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=fb_outbound_notspam policy=fb_outbound score=0 bulkscore=0 malwarescore=0 suspectscore=0 priorityscore=1501 clxscore=1034 impostorscore=0 mlxscore=0 mlxlogscore=660 lowpriorityscore=0 spamscore=0 phishscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2201190122 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Changes v3 => v4: 1. Rename text_poke_jit() => text_poke_copy(). (Peter) 2. Change comment style. (Peter) Changes v2 => v3: 1. Fix tailcall. Changes v1 => v2: 1. Use text_poke instead of writing through linear mapping. (Peter) 2. Avoid making changes to non-x86_64 code. Most BPF programs are small, but they consume a page each. For systems with busy traffic and many BPF programs, this could also add significant pressure to instruction TLB. This set tries to solve this problem with customized allocator that pack multiple programs into a huge page. Patches 1-5 prepare the work. Patch 6 contains key logic of the allocator. Patch 7 uses this allocator in x86_64 jit compiler. Song Liu (7): x86/Kconfig: select HAVE_ARCH_HUGE_VMALLOC with HAVE_ARCH_HUGE_VMAP bpf: use bytes instead of pages for bpf_jit_[charge|uncharge]_modmem bpf: use size instead of pages in bpf_binary_header bpf: add a pointer of bpf_binary_header to bpf_prog x86/alternative: introduce text_poke_copy bpf: introduce bpf_prog_pack allocator bpf, x86_64: use bpf_prog_pack allocator arch/x86/Kconfig | 1 + arch/x86/include/asm/text-patching.h | 1 + arch/x86/kernel/alternative.c | 32 ++++ arch/x86/net/bpf_jit_comp.c | 135 +++++++++++++---- include/linux/bpf.h | 4 +- include/linux/filter.h | 23 ++- kernel/bpf/core.c | 213 ++++++++++++++++++++++++--- kernel/bpf/trampoline.c | 6 +- 8 files changed, 356 insertions(+), 59 deletions(-) --- 2.30.2