From patchwork Tue Jun 23 07:07:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Liu X-Patchwork-Id: 217347 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=-4.1 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 CD59AC433E0 for ; Tue, 23 Jun 2020 07:08:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AC69E206B7 for ; Tue, 23 Jun 2020 07:08:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="HbmE/JDA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731030AbgFWHIX (ORCPT ); Tue, 23 Jun 2020 03:08:23 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:39642 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730781AbgFWHIX (ORCPT ); Tue, 23 Jun 2020 03:08:23 -0400 Received: from pps.filterd (m0109331.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 05N74oMl031703 for ; Tue, 23 Jun 2020 00:08:22 -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=kpRFK5eT7Y0Oe/2pX8/G8IcpgFJH82Ap6lBX97XpQqs=; b=HbmE/JDAYj72vHT3TotUCr81k9hQXGWi5EiIsHMuEs+D2meWAI6dye2PzNEz8JmBWCh1 5Q/dlVoUkfzomZXENw6tQaqsHKtZwKjGGXN8/hSx7HlNp8uCHkfn0KUWjxLqkj5fNRIQ 5UEXpojtXBad564+Bq5A0e+8Pt0VO1trXrk= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 31sg9fm97t-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Tue, 23 Jun 2020 00:08:22 -0700 Received: from intmgw004.08.frc2.facebook.com (2620:10d:c085:208::f) by mail.thefacebook.com (2620:10d:c085:11d::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Tue, 23 Jun 2020 00:08:20 -0700 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id 5019262E50B5; Tue, 23 Jun 2020 00:08:12 -0700 (PDT) Smtp-Origin-Hostprefix: devbig From: Song Liu Smtp-Origin-Hostname: devbig006.ftw2.facebook.com To: , CC: , , , , , Song Liu Smtp-Origin-Cluster: ftw2c04 Subject: [PATCH bpf-next 0/3] bpf: introduce bpf_get_task_stack_trace() Date: Tue, 23 Jun 2020 00:07:59 -0700 Message-ID: <20200623070802.2310018-1-songliubraving@fb.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-06-23_04:2020-06-22,2020-06-23 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 spamscore=0 clxscore=1011 phishscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 cotscore=-2147483648 suspectscore=9 mlxlogscore=752 mlxscore=0 malwarescore=0 impostorscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006230055 X-FB-Internal: deliver Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This set introduces a new helper bpf_get_task_stack_trace(). The primary use case is to dump all /proc/*/stack to seq_file via bpf_iter__task. Song Liu (3): bpf: introduce helper bpf_get_task_stack_trace() bpf: allow %pB in bpf_seq_printf() selftests/bpf: add bpf_iter test with bpf_get_task_stack_trace() include/uapi/linux/bpf.h | 10 +++- kernel/trace/bpf_trace.c | 24 ++++++++- scripts/bpf_helpers_doc.py | 2 + tools/include/uapi/linux/bpf.h | 10 +++- .../selftests/bpf/prog_tests/bpf_iter.c | 17 +++++++ .../selftests/bpf/progs/bpf_iter_task_stack.c | 50 +++++++++++++++++++ 6 files changed, 110 insertions(+), 3 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c --- 2.24.1