From patchwork Fri Nov 15 19:48:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vadim Fedorenko X-Patchwork-Id: 13876734 X-Patchwork-Delegate: bpf@iogearbox.net Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 59D7A1E25E6 for ; Fri, 15 Nov 2024 19:49:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=67.231.145.42 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731700166; cv=none; b=TcUtp3KytdaRegDwo/klYeoOFp6MHi6XCrelmkvXUr9DJ0g2WXh+hkG0jwjhaxCDD6xbo7RiaMVYI6xiyoLWefMIFpL0N+036EwrEPH20ARJkT4FjzfxDVGxnta/Yn3KLgG7h7gmWBeqBI2bHpFZjd4grMDVRFRIINRxeWviH4Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731700166; c=relaxed/simple; bh=q2zm7XhpWXgczVLTp50flukPx5I2rnMRsgcIbA/JdIM=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=L4Zf9B3tVc7xOGIvn+ubgLVdO3HWR0qiqfQL3w831Qd1HMAKz5keTqCPjrmbVoN2voULj6R5YyykxWpCl6Gbsrq345W4p6RRwkVkknlcTwJFicyN0NMCQv/19qf680NnhPSx7KlNrrupegQ1ZP9cXuPW7JXsaAICZvHnS8LYdKw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com; spf=pass smtp.mailfrom=meta.com; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b=b6dpt/qV; arc=none smtp.client-ip=67.231.145.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=meta.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b="b6dpt/qV" Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4AFIVHoI001670; Fri, 15 Nov 2024 11:48:55 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=meta.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=s2048-2021-q4; bh=B445bxnRd7VbM2XZKpHtwArCnEdBMewd+pcv5w8IaSQ=; b=b6dpt/qVSyrN x5dS2k3tZS4fNAvbRMhgMQIvsUrdOIdiQ3biC4j/xzkTcQ8hH9L86FsHEQgUZRTb 3+t5NRBIthnPsFYsFJiORxOw5cIBG+7Bv5WGTPjsOrU/Wb0I5Xzvnr+z4HoVLiTg SXueuPXXXokOF2IA5zbA7C2Rx1ZNd4/85sXMrAbww50dQ0UttfkiZm0XHL1Ltmun 35SdTXWIks8RoSsRVUADekvMQ85WaCB+niMqnpsdDRlpwAdbDLETWUrKgHthrswV vz90NMJ6zXA7K5rpgvltLErWlcksE0KJxtRu8fG/UZdI1Y+lkl9/wA8ptTl5Pluw f34B/flImg== Received: from maileast.thefacebook.com ([163.114.135.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 42x6cmk29d-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Fri, 15 Nov 2024 11:48:54 -0800 (PST) Received: from devvm4158.cln0.facebook.com (2620:10d:c0a8:1b::2d) by mail.thefacebook.com (2620:10d:c0a9:6f::237c) with Microsoft SMTP Server id 15.2.1544.11; Fri, 15 Nov 2024 19:48:53 +0000 From: Vadim Fedorenko To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Thomas Gleixner , Vadim Fedorenko , Mykola Lysenko CC: , , Vadim Fedorenko , Martin KaFai Lau Subject: [PATCH bpf-next v6 4/4] selftests/bpf: add usage example for cpu cycles kfuncs Date: Fri, 15 Nov 2024 11:48:41 -0800 Message-ID: <20241115194841.2108634-5-vadfed@meta.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241115194841.2108634-1-vadfed@meta.com> References: <20241115194841.2108634-1-vadfed@meta.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-GUID: RllKE5sml1CEiuZ60-TsuekZI2SeWpj0 X-Proofpoint-ORIG-GUID: RllKE5sml1CEiuZ60-TsuekZI2SeWpj0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-05_03,2024-10-04_01,2024-09-30_01 X-Patchwork-Delegate: bpf@iogearbox.net The selftest provides an example of how to measure the latency of bpf kfunc/helper call in cycles and nanoseconds. Signed-off-by: Vadim Fedorenko --- .../bpf/prog_tests/test_cpu_cycles.c | 35 +++++++++++++++++++ .../selftests/bpf/progs/test_cpu_cycles.c | 25 +++++++++++++ 2 files changed, 60 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/test_cpu_cycles.c create mode 100644 tools/testing/selftests/bpf/progs/test_cpu_cycles.c diff --git a/tools/testing/selftests/bpf/prog_tests/test_cpu_cycles.c b/tools/testing/selftests/bpf/prog_tests/test_cpu_cycles.c new file mode 100644 index 000000000000..d7f3b66594b3 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/test_cpu_cycles.c @@ -0,0 +1,35 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2024 Meta Inc. */ + +#include +#include "test_cpu_cycles.skel.h" + +static void cpu_cycles(void) +{ + LIBBPF_OPTS(bpf_test_run_opts, opts); + struct test_cpu_cycles *skel; + int err, pfd; + + skel = test_cpu_cycles__open_and_load(); + if (!ASSERT_OK_PTR(skel, "test_cpu_cycles open and load")) + return; + + pfd = bpf_program__fd(skel->progs.bpf_cpu_cycles); + if (!ASSERT_GT(pfd, 0, "test_cpu_cycles fd")) + goto fail; + + err = bpf_prog_test_run_opts(pfd, &opts); + if (!ASSERT_OK(err, "test_cpu_cycles test run")) + goto fail; + + ASSERT_NEQ(skel->bss->cycles, 0, "test_cpu_cycles 0 cycles"); + ASSERT_NEQ(skel->bss->ns, 0, "test_cpu_cycles 0 ns"); +fail: + test_cpu_cycles__destroy(skel); +} + +void test_cpu_cycles(void) +{ + if (test__start_subtest("cpu_cycles")) + cpu_cycles(); +} diff --git a/tools/testing/selftests/bpf/progs/test_cpu_cycles.c b/tools/testing/selftests/bpf/progs/test_cpu_cycles.c new file mode 100644 index 000000000000..48762f07ad7f --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_cpu_cycles.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2024 Meta Inc. */ + +#include "vmlinux.h" +#include + +extern u64 bpf_cpu_cycles_to_ns(u64 cycles) __weak __ksym; +extern u64 bpf_get_cpu_cycles(void) __weak __ksym; + +__u64 cycles, ns; + +SEC("syscall") +int bpf_cpu_cycles(void) +{ + struct bpf_pidns_info pidns; + __u64 start; + + start = bpf_get_cpu_cycles(); + bpf_get_ns_current_pid_tgid(0, 0, &pidns, sizeof(struct bpf_pidns_info)); + cycles = bpf_get_cpu_cycles() - start; + ns = bpf_cpu_cycles_to_ns(cycles); + return 0; +} + +char _license[] SEC("license") = "GPL";