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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4482EC433F5 for ; Fri, 14 Jan 2022 00:49:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238550AbiANAtT (ORCPT ); Thu, 13 Jan 2022 19:49:19 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:22938 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238527AbiANAtT (ORCPT ); Thu, 13 Jan 2022 19:49:19 -0500 Received: from pps.filterd (m0044010.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.1.2/8.16.1.2) with ESMTP id 20DN7C5f026185 for ; Thu, 13 Jan 2022 16:49:19 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=AE5AYS7TYVWXWUx2j1JgjBiqe6Rfoqcg8Dq9/iFbchg=; b=n3pTAHh48K3B6HV96g5C0xBwAdM50Ooz/sjr4JgZMwBS/tA15IJ3bZ7kjNGSAjnanYH+ sh1KoU2tIj7X49JND0qxA41umLSYiDUTDOOK1pxxY4zTNvDSA0qjyFoKh0Do/am56gFs KK9BinrBssaT6+vza7mqIdYMoeIccVArbk8= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3djh92w0q2-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 13 Jan 2022 16:49:19 -0800 Received: from twshared13833.42.prn1.facebook.com (2620:10d:c085:208::f) by mail.thefacebook.com (2620:10d:c085:11d::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Thu, 13 Jan 2022 16:49:18 -0800 Received: by devbig014.vll3.facebook.com (Postfix, from userid 7377) id 3C3CD8FA31C4; Thu, 13 Jan 2022 16:49:11 -0800 (PST) From: Kenny Yu To: , , , , CC: Kenny Yu Subject: [PATCH v2 bpf-next 0/4] Add bpf_access_process_vm helper and sleepable bpf iterator programs Date: Thu, 13 Jan 2022 16:48:56 -0800 Message-ID: <20220114004900.3756025-1-kennyyu@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220113233158.1582743-1-kennyyu@fb.com> References: <20220113233158.1582743-1-kennyyu@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-ORIG-GUID: UxegXj4G7O6hjHN7WjT5LLKYcAPsx4Kh X-Proofpoint-GUID: UxegXj4G7O6hjHN7WjT5LLKYcAPsx4Kh 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=2022-01-13_10,2022-01-13_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=fb_outbound_notspam policy=fb_outbound score=0 mlxscore=0 malwarescore=0 clxscore=1015 phishscore=0 priorityscore=1501 adultscore=0 mlxlogscore=721 spamscore=0 impostorscore=0 bulkscore=0 suspectscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2201140002 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org This patch series makes the following changes: * Adds a new bpf helper `bpf_access_process_vm` to read user space memory from a different task. * Adds the ability to create sleepable bpf iterator programs. As an example of how this will be used, at Meta we are using bpf task ite= rator programs and this new bpf helper to read C++ async stack traces of a runn= ing process for debugging C++ binaries in production. Changes since v1: * Fixed "Invalid wait context" issue in `bpf_iter_run_prog` by using `rcu_read_lock_trace()` for sleepable bpf iterator programs. Kenny Yu (4): bpf: Add bpf_access_process_vm() helper bpf: Add support for sleepable programs in bpf_iter_run_prog libbpf: Add "iter.s" section for sleepable bpf iterator programs selftests/bpf: Add test for sleepable bpf iterator programs include/linux/bpf.h | 1 + include/uapi/linux/bpf.h | 10 ++++ kernel/bpf/bpf_iter.c | 16 ++++-- kernel/bpf/helpers.c | 19 +++++++ kernel/trace/bpf_trace.c | 2 + tools/include/uapi/linux/bpf.h | 10 ++++ tools/lib/bpf/libbpf.c | 1 + .../selftests/bpf/prog_tests/bpf_iter.c | 16 ++++++ .../selftests/bpf/progs/bpf_iter_task.c | 54 +++++++++++++++++++ 9 files changed, 126 insertions(+), 3 deletions(-) --=20 2.30.2