From patchwork Wed Aug 31 02:37:42 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: 12960264 X-Patchwork-Delegate: bpf@iogearbox.net 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 D183FECAAD5 for ; Wed, 31 Aug 2022 02:38:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231926AbiHaCij (ORCPT ); Tue, 30 Aug 2022 22:38:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60820 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231961AbiHaCih (ORCPT ); Tue, 30 Aug 2022 22:38:37 -0400 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9BB729C8E5 for ; Tue, 30 Aug 2022 19:38:36 -0700 (PDT) Received: from pps.filterd (m0109334.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27V0pkHe017536 for ; Tue, 30 Aug 2022 19:38:36 -0700 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=VB0cB4w1BhkqRAgwGMfOqdO2X5v4mecea9EzhMB5sIw=; b=bcPd29BC2LQYP5PEjxTQ0M0ZoNIKav4adoeA0IggEH6RNVy6/4o3tfXc3timDGJwB/W1 CKNqKVcaPJuEIoEHiXkWlPvl5cjDUR0028b9PM3n7TL9nviquwqUyxCKcoQ/xy55sEf8 2XJebBqD9zM7+IC+R1WHaI9tacS7af7dpOs= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3j9qmh2m3b-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Tue, 30 Aug 2022 19:38:36 -0700 Received: from twshared1781.23.frc3.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Tue, 30 Aug 2022 19:38:34 -0700 Received: by devbig931.frc1.facebook.com (Postfix, from userid 460691) id BBF9475A73F4; Tue, 30 Aug 2022 19:38:27 -0700 (PDT) From: Kui-Feng Lee To: , , , , , CC: Kui-Feng Lee Subject: [PATCH bpf-next v9 3/5] bpf: Handle show_fdinfo for the parameterized task BPF iterators Date: Tue, 30 Aug 2022 19:37:42 -0700 Message-ID: <20220831023744.1790468-4-kuifeng@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220831023744.1790468-1-kuifeng@fb.com> References: <20220831023744.1790468-1-kuifeng@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: S-qyTMDTrGhwr9AmDQT7QUQ_o84mmH3r X-Proofpoint-GUID: S-qyTMDTrGhwr9AmDQT7QUQ_o84mmH3r X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-31_01,2022-08-30_01,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Show information of iterators in the respective files under /proc//fdinfo/. For example, for a task file iterator with 1723 as the value of tid parameter, its fdinfo would look like the following lines. pos: 0 flags: 02000000 mnt_id: 14 ino: 38 link_type: iter link_id: 51 prog_tag: a590ac96db22b825 prog_id: 299 target_name: task_file task_type: TID tid: 1723 This patch add the last three fields. task_type is the type of the task parameter. TID means the iterator visit only the thread specified by tid. The value of tid in the above example is 1723. For the case of PID task_type, it means the iterator visits only threads of a process and will show the pid value of the process instead of a tid. Signed-off-by: Kui-Feng Lee Acked-by: Yonghong Song --- kernel/bpf/task_iter.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c index 14e0b1993738..c4a40f0864e6 100644 --- a/kernel/bpf/task_iter.c +++ b/kernel/bpf/task_iter.c @@ -10,6 +10,12 @@ #include #include "mmap_unlock_work.h" +static const char * const iter_task_type_names[] = { + "ALL", + "TID", + "PID", +}; + struct bpf_iter_seq_task_common { struct pid_namespace *ns; enum bpf_iter_task_type type; @@ -690,6 +696,15 @@ static int bpf_iter_fill_link_info(const struct bpf_iter_aux_info *aux, struct b return 0; } +static void bpf_iter_task_show_fdinfo(const struct bpf_iter_aux_info *aux, struct seq_file *seq) +{ + seq_printf(seq, "task_type:\t%s\n", iter_task_type_names[aux->task.type]); + if (aux->task.type == BPF_TASK_ITER_TID) + seq_printf(seq, "tid:\t%u\n", aux->task.pid); + else if (aux->task.type == BPF_TASK_ITER_TGID) + seq_printf(seq, "pid:\t%u\n", aux->task.pid); +} + static struct bpf_iter_reg task_reg_info = { .target = "task", .attach_target = bpf_iter_attach_task, @@ -701,6 +716,7 @@ static struct bpf_iter_reg task_reg_info = { }, .seq_info = &task_seq_info, .fill_link_info = bpf_iter_fill_link_info, + .show_fdinfo = bpf_iter_task_show_fdinfo, }; static const struct bpf_iter_seq_info task_file_seq_info = { @@ -723,6 +739,7 @@ static struct bpf_iter_reg task_file_reg_info = { }, .seq_info = &task_file_seq_info, .fill_link_info = bpf_iter_fill_link_info, + .show_fdinfo = bpf_iter_task_show_fdinfo, }; static const struct bpf_iter_seq_info task_vma_seq_info = { @@ -745,6 +762,7 @@ static struct bpf_iter_reg task_vma_reg_info = { }, .seq_info = &task_vma_seq_info, .fill_link_info = bpf_iter_fill_link_info, + .show_fdinfo = bpf_iter_task_show_fdinfo, }; BPF_CALL_5(bpf_find_vma, struct task_struct *, task, u64, start,