From patchwork Mon Sep 26 18:49:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kui-Feng Lee X-Patchwork-Id: 12989295 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 B1E13C6FA90 for ; Mon, 26 Sep 2022 18:50:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230482AbiIZSuY (ORCPT ); Mon, 26 Sep 2022 14:50:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54006 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230484AbiIZSuW (ORCPT ); Mon, 26 Sep 2022 14:50:22 -0400 Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1CEE5491C9 for ; Mon, 26 Sep 2022 11:50:19 -0700 (PDT) Received: from pps.filterd (m0109332.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 28QI9QG9026573 for ; Mon, 26 Sep 2022 11:50:18 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : content-type : content-transfer-encoding : mime-version; s=facebook; bh=NAZdpK1mrAdtrgNCFzMqyWOnvqOrDkE7WByTARUVt+g=; b=CQ47mq2mUvJkLX5678C5SFTOvPuJzBgJyIOdpeuNYfAZ8vfWiFn1GzZpTSrq0VnIecD4 +RsGiapFiGIzV8InFqMrhxtcDaSK1qrFrurKfxkhxKcELARA+mekbFRBecTcUVDf4v5K lrSmkPlUROBMp77rP3d3fAM4vhsyY553VaQ= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3jsyn058f5-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Mon, 26 Sep 2022 11:50:18 -0700 Received: from twshared10425.14.frc2.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Mon, 26 Sep 2022 11:50:11 -0700 Received: by devbig931.frc1.facebook.com (Postfix, from userid 460691) id A936C8951014; Mon, 26 Sep 2022 11:49:59 -0700 (PDT) From: Kui-Feng Lee To: , , , , , CC: Kui-Feng Lee Subject: [PATCH bpf-next v11 0/5] Parameterize task iterators. Date: Mon, 26 Sep 2022 11:49:52 -0700 Message-ID: <20220926184957.208194-1-kuifeng@fb.com> X-Mailer: git-send-email 2.30.2 X-FB-Internal: Safe X-Proofpoint-GUID: lhyeVMVqYxjYpsVqC-xH-OLgsBVF7AlC X-Proofpoint-ORIG-GUID: lhyeVMVqYxjYpsVqC-xH-OLgsBVF7AlC X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.528,FMLib:17.11.122.1 definitions=2022-09-26_09,2022-09-22_02,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Allow creating an iterator that loops through resources of one task/thread. People could only create iterators to loop through all resources of files, vma, and tasks in the system, even though they were interested in only the resources of a specific task or process. Passing the additional parameters, people can now create an iterator to go through all resources or only the resources of a task. Major Changes: - Add new parameters in bpf_iter_link_info to indicate to go through all tasks or to go through a specific task. - Change the implementations of BPF iterators of vma, files, and tasks to allow going through only the resources of a specific task. - Provide the arguments of parameterized task iterators in bpf_link_info. Differences from v10: - Check pid_alive() to avoid potential errors. Differences from v9: - Fix the boundary check of computing page_shift. - Rewording the reason of checking and returning the same task. Differences from v8: - Fix uninitialized variable. - Avoid redundant work of getting task from pid. - Change format string to use %u instead of %d. - Use the value of page_shift to compute correct offset in bpf_iter_vm_offset.c. Differences from v7: - Travel the tasks of a process through task_group linked list instead of traveling through the whole namespace. Differences from v6: - Add part 5 to make bpftool show the value of parameters. - Change of wording of show_fdinfo() to show pid or tid instead of always pid. - Simplify error handling and naming of test cases. Differences from v5: - Use user-space tid/pid terminologies in bpf_iter_link_info and bpf_link_info. - Fix reference count - Merge all variants to one 'u32 pid' in internal structs. (bpf_iter_aux_info and bpf_iter_seq_task_common) - Compare the result of get_uprobe_offset() with the implementation with the vma iterators. - Implement show_fdinfo. Differences from v4: - Remove 'type' from bpf_iter_link_info and bpf_link_info. v10: https://lore.kernel.org/all/20220831181039.2680134-1-kuifeng@fb.com/ v9: https://lore.kernel.org/bpf/20220829192317.486946-1-kuifeng@fb.com/ v8: https://lore.kernel.org/bpf/20220829192317.486946-1-kuifeng@fb.com/ v7: https://lore.kernel.org/bpf/20220826003712.2810158-1-kuifeng@fb.com/ v6: https://lore.kernel.org/bpf/20220819220927.3409575-1-kuifeng@fb.com/ v5: https://lore.kernel.org/bpf/20220811001654.1316689-1-kuifeng@fb.com/ v4: https://lore.kernel.org/bpf/20220809195429.1043220-1-kuifeng@fb.com/ v3: https://lore.kernel.org/bpf/20220809063501.667610-1-kuifeng@fb.com/ v2: https://lore.kernel.org/bpf/20220801232649.2306614-1-kuifeng@fb.com/ v1: https://lore.kernel.org/bpf/20220726051713.840431-1-kuifeng@fb.com/ Kui-Feng Lee (5): bpf: Parameterize task iterators. bpf: Handle bpf_link_info for the parameterized task BPF iterators. bpf: Handle show_fdinfo for the parameterized task BPF iterators selftests/bpf: Test parameterized task BPF iterators. bpftool: Show parameters of BPF task iterators. include/linux/bpf.h | 25 ++ include/uapi/linux/bpf.h | 10 + kernel/bpf/task_iter.c | 228 ++++++++++++-- tools/bpf/bpftool/link.c | 19 ++ tools/include/uapi/linux/bpf.h | 10 + .../selftests/bpf/prog_tests/bpf_iter.c | 282 ++++++++++++++++-- .../selftests/bpf/prog_tests/btf_dump.c | 2 +- .../selftests/bpf/progs/bpf_iter_task.c | 9 + .../selftests/bpf/progs/bpf_iter_task_file.c | 9 +- .../selftests/bpf/progs/bpf_iter_task_vma.c | 7 +- .../selftests/bpf/progs/bpf_iter_vma_offset.c | 37 +++ 11 files changed, 592 insertions(+), 46 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_vma_offset.c Acked-by: Martin KaFai Lau