From patchwork Sat Jul 11 01:26:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Liu X-Patchwork-Id: 1327203 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: incoming-bpf@patchwork.ozlabs.org Delivered-To: patchwork-incoming-bpf@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=bpf-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=reject dis=none) header.from=fb.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=fb.com header.i=@fb.com header.a=rsa-sha256 header.s=facebook header.b=cwzPqJzF; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4B3XPt1qRrz9sRk for ; Sat, 11 Jul 2020 11:29:22 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727006AbgGKB3O (ORCPT ); Fri, 10 Jul 2020 21:29:14 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:38728 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726605AbgGKB3O (ORCPT ); Fri, 10 Jul 2020 21:29:14 -0400 Received: from pps.filterd (m0148460.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 06B1OTFb027668 for ; Fri, 10 Jul 2020 18:29:13 -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=Zt9u2EpjWjLtKzNqOLuW2yd8dLixE48PVNDjLnQBOGM=; b=cwzPqJzFj3nKDLXek/ZNIQ/9oxUu1edCuWpV3UbI6SQ3J12UrHs9ZJAHSADpnl9oMBoh kgl/ynnFLB0FjLoGiA8OFYivfDc69+gPJtRY5CChtOM6JW6e6C9USV94A0WzaMeLolBf Q7Nwj9uq1bzrNcTsjx79Jhv6CULRu39q5zU= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 325k2cd84t-15 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 10 Jul 2020 18:29:13 -0700 Received: from intmgw004.03.ash8.facebook.com (2620:10d:c085:208::f) by mail.thefacebook.com (2620:10d:c085:11d::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Fri, 10 Jul 2020 18:29:09 -0700 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id 56F4662E5296; Fri, 10 Jul 2020 18:27:00 -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 5/5] selftests/bpf: add callchain_stackid Date: Fri, 10 Jul 2020 18:26:39 -0700 Message-ID: <20200711012639.3429622-6-songliubraving@fb.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200711012639.3429622-1-songliubraving@fb.com> References: <20200711012639.3429622-1-songliubraving@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-07-10_14:2020-07-10,2020-07-10 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 suspectscore=0 priorityscore=1501 impostorscore=0 adultscore=0 mlxscore=0 bulkscore=0 phishscore=0 malwarescore=0 spamscore=0 lowpriorityscore=0 mlxlogscore=999 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007110006 X-FB-Internal: deliver Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org This tests new helper function bpf_get_callchain_stackid(), which is the alternative to bpf_get_stackid() for perf_event with PEBS entry. Signed-off-by: Song Liu --- .../bpf/prog_tests/callchain_stackid.c | 61 +++++++++++++++++++ .../selftests/bpf/progs/callchain_stackid.c | 37 +++++++++++ 2 files changed, 98 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/callchain_stackid.c create mode 100644 tools/testing/selftests/bpf/progs/callchain_stackid.c diff --git a/tools/testing/selftests/bpf/prog_tests/callchain_stackid.c b/tools/testing/selftests/bpf/prog_tests/callchain_stackid.c new file mode 100644 index 0000000000000..ebe6251324a1a --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/callchain_stackid.c @@ -0,0 +1,61 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2020 Facebook +#include +#include "callchain_stackid.skel.h" + +void test_callchain_stackid(void) +{ + struct perf_event_attr attr = { + /* .type = PERF_TYPE_SOFTWARE, */ + .type = PERF_TYPE_HARDWARE, + .config = PERF_COUNT_HW_CPU_CYCLES, + .precise_ip = 2, + .sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_BRANCH_STACK | + PERF_SAMPLE_CALLCHAIN, + .branch_sample_type = PERF_SAMPLE_BRANCH_USER | + PERF_SAMPLE_BRANCH_NO_FLAGS | + PERF_SAMPLE_BRANCH_NO_CYCLES | + PERF_SAMPLE_BRANCH_CALL_STACK, + .sample_period = 5000, + .size = sizeof(struct perf_event_attr), + }; + struct callchain_stackid *skel; + __u32 duration = 0; + int pmu_fd, err; + + skel = callchain_stackid__open(); + + if (CHECK(!skel, "skel_open", "skeleton open failed\n")) + return; + + /* override program type */ + bpf_program__set_perf_event(skel->progs.oncpu); + + err = callchain_stackid__load(skel); + if (CHECK(err, "skel_load", "skeleton load failed: %d\n", err)) + goto cleanup; + + pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */, + 0 /* cpu 0 */, -1 /* group id */, + 0 /* flags */); + if (pmu_fd < 0) { + printf("%s:SKIP:cpu doesn't support the event\n", __func__); + test__skip(); + goto cleanup; + } + + skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu, + pmu_fd); + if (CHECK(IS_ERR(skel->links.oncpu), "attach_perf_event", + "err %ld\n", PTR_ERR(skel->links.oncpu))) { + close(pmu_fd); + goto cleanup; + } + usleep(500000); + + CHECK(skel->data->total_val == 1, "get_callchain_stack", "failed\n"); + close(pmu_fd); + +cleanup: + callchain_stackid__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/callchain_stackid.c b/tools/testing/selftests/bpf/progs/callchain_stackid.c new file mode 100644 index 0000000000000..aab2c736a0a45 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/callchain_stackid.c @@ -0,0 +1,37 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2020 Facebook +#include "vmlinux.h" +#include + +#ifndef PERF_MAX_STACK_DEPTH +#define PERF_MAX_STACK_DEPTH 127 +#endif + +#ifndef BPF_F_USER_STACK +#define BPF_F_USER_STACK (1ULL << 8) +#endif + +typedef __u64 stack_trace_t[PERF_MAX_STACK_DEPTH]; +struct { + __uint(type, BPF_MAP_TYPE_STACK_TRACE); + __uint(max_entries, 16384); + __uint(key_size, sizeof(__u32)); + __uint(value_size, sizeof(stack_trace_t)); +} stackmap SEC(".maps"); + +long total_val = 1; + +SEC("perf_event") +int oncpu(struct bpf_perf_event_data *ctx) +{ + long val; + + val = bpf_get_callchain_stackid(ctx->callchain, &stackmap, 0); + + if (val > 0) + total_val += val; + + return 0; +} + +char LICENSE[] SEC("license") = "GPL";