From mboxrd@z Thu Jan 1 00:00:00 1970 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 69F83B640 for ; Sat, 23 Nov 2024 01:00:14 +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=1732323616; cv=none; b=kM9reZQcyfE3n+wPQ1jVMtvs3lEztaT9JJoUGTognTTDEFeXnJuI6jhWhYG7kJ3JwQYXZNpK9AtVxJPKY9q4UvFngS/tBBPMLyMI3xevutaV7T9Udwd1+DHma0q9S2wX3nQS4GcjsQtEULzkCIVqwz7fjv69ZkV6EuZ/VCr+MFo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732323616; c=relaxed/simple; bh=5ruu02lER49hN8SN1722t2/UI4BonP+BKjNvkhrFR2I=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=jV3SgJwvZl9hY410TLCmGCssOvxHvdk9b4GJ2rANEKigaR/wyJrS07Xr4xUAqPtGF9lFRdSNLYYt52HhT9koDuvpqJO/bdfxXANrTY3F20Di2KOEPmV2j8efJy+bup4kB0Hze/+xWCgI5cXH8JMTgL4oCRKXql1rISLF5BmvQDg= 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=eb3hyjdh; 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="eb3hyjdh" 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 4AMLTlnM011576; Fri, 22 Nov 2024 16:59:33 -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=dA0SdFg1w+zM1RemFAI9uKJrQlaY7fI/II8tR7fNv24=; b=eb3hyjdhSfT7 qlexFJkmhqusdvfY2tupS1re+C57HQQ+GsLKN2qCscC/RZySgULG0ptl4oXejcLv 5UShSqJmAKy20EhvIuoY1xvg/vjKnxB+/WKPj8DsN/jeRRrax67Y+PryHAAjSaCR Pd4/9nD61G5zCBZgI8n7rn1WJi5uIZyWOl1MfP8lBXRAcZn2r/tr3lr+W2vPJCZn ojl9fzfguM8s42mSkzbI4WOPOvPS2ZAj2ChmjWPXuUKxGW/TXjhH4fx5BHRYzZ12 QRq9uNU4cRwZvm4y3vZnuklHfFuCJ6XlcWs6MLdmrRXDr5IUldWJgWosRiSqD6da Z+IZrmLWRA== Received: from maileast.thefacebook.com ([163.114.135.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 4331wrh333-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Fri, 22 Nov 2024 16:59:32 -0800 (PST) Received: from devvm4158.cln0.facebook.com (2620:10d:c0a8:1b::8e35) by mail.thefacebook.com (2620:10d:c0a9:6f::237c) with Microsoft SMTP Server id 15.2.1544.11; Sat, 23 Nov 2024 00:59:02 +0000 From: Vadim Fedorenko To: Borislav Petkov , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Thomas Gleixner , Yonghong Song , Vadim Fedorenko , Mykola Lysenko CC: , , Peter Zijlstra , Vadim Fedorenko , Martin KaFai Lau Subject: [PATCH bpf-next v9 4/4] selftests/bpf: add usage example for cpu time counter kfuncs Date: Fri, 22 Nov 2024 16:58:33 -0800 Message-ID: <20241123005833.810044-5-vadfed@meta.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241123005833.810044-1-vadfed@meta.com> References: <20241123005833.810044-1-vadfed@meta.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Proofpoint-GUID: g6MU5MXELMlBg_SVW0NT6PxQWU1WJFwk X-Proofpoint-ORIG-GUID: g6MU5MXELMlBg_SVW0NT6PxQWU1WJFwk 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 The selftest provides an example of how to measure the latency of bpf kfunc/helper call using time stamp counter and how to convert measured value into 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..a7f8a4c6b854 --- /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_time_counter_to_ns(u64 cycles) __weak __ksym; +extern u64 bpf_get_cpu_time_counter(void) __weak __ksym; + +__u64 cycles, ns; + +SEC("syscall") +int bpf_cpu_cycles(void) +{ + struct bpf_pidns_info pidns; + __u64 start; + + start = bpf_get_cpu_time_counter(); + bpf_get_ns_current_pid_tgid(0, 0, &pidns, sizeof(struct bpf_pidns_info)); + cycles = bpf_get_cpu_time_counter() - start; + ns = bpf_cpu_time_counter_to_ns(cycles); + return 0; +} + +char _license[] SEC("license") = "GPL"; -- 2.43.5