From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7BD58C432C0 for ; Tue, 26 Nov 2019 12:13:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2DF592075C for ; Tue, 26 Nov 2019 12:13:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574770393; bh=Rs4HXMcto03SyVG32tpBjRZdzHn+VYDPtYZa4E+fPrc=; h=From:To:Cc:Subject:Date:List-ID:From; b=EcTAU8+E/1cIH7b7fTKpGFB8gdahLPa9emfIPzxBkUfzBbcvMoLTgExDdmULu5lOp iNApnfWvVu18QpytiO4njUrPE3bJdOc+8qM12u2bdKWZBkM5O1aKwZKA5hpudny1Vx 34euql+Gf0tGSIsNYntTncxikHYwovWV3Rz4y7gw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728277AbfKZMNM convert rfc822-to-8bit (ORCPT ); Tue, 26 Nov 2019 07:13:12 -0500 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:52279 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728216AbfKZMNL (ORCPT ); Tue, 26 Nov 2019 07:13:11 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-272-Lf3LCucJOjqU-xrFJNGEEw-1; Tue, 26 Nov 2019 07:13:06 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8BE1080058F; Tue, 26 Nov 2019 12:13:04 +0000 (UTC) Received: from krava.redhat.com (unknown [10.43.17.48]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8D0D160BEC; Tue, 26 Nov 2019 12:12:54 +0000 (UTC) From: Jiri Olsa To: Arnaldo Carvalho de Melo Cc: lkml , netdev@vger.kernel.org, bpf@vger.kernel.org, Ingo Molnar , Namhyung Kim , Alexander Shishkin , Peter Zijlstra , Michael Petlan , =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= , Jesper Dangaard Brouer , Daniel Borkmann , Alexei Starovoitov , Martin KaFai Lau , Song Liu , Yonghong Song , Andrii Nakryiko Subject: [PATCH] perf tools: Allow to link with libbpf dynamicaly Date: Tue, 26 Nov 2019 13:12:53 +0100 Message-Id: <20191126121253.28253-1-jolsa@kernel.org> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: Lf3LCucJOjqU-xrFJNGEEw-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently we support only static linking with kernel's libbpf (tools/lib/bpf). This patch adds libbpf package detection and support to link perf with it dynamically. The libbpf package status is displayed with: $ make VF=1 Auto-detecting system features: ... ... libbpf: [ on ] It's not checked by default, because it's quite new. Once it's on most distros we can switch it on. For the same reason it's not added to the test-all check. Perf does not need advanced version of libbpf, so we can check just for the base bpf_object__open function. Adding new compile variable to detect libbpf package and link bpf dynamically: $ make LIBBPF_DYNAMIC=1 ... LINK perf $ ldd perf | grep bpf libbpf.so.0 => /lib64/libbpf.so.0 (0x00007f46818bc000) If libbpf is not installed, build stops with: Makefile.config:486: *** Error: No libbpf devel library found,\ please install libbpf-devel. Stop. Link: http://lkml.kernel.org/n/tip-kjdr6k37nuoiwbl0yltla1nh@git.kernel.org Signed-off-by: Jiri Olsa --- tools/build/Makefile.feature | 3 ++- tools/build/feature/Makefile | 4 ++++ tools/build/feature/test-libbpf.c | 7 +++++++ tools/perf/Makefile.config | 10 ++++++++++ tools/perf/Makefile.perf | 6 +++++- 5 files changed, 28 insertions(+), 2 deletions(-) create mode 100644 tools/build/feature/test-libbpf.c diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature index 8a19753cc26a..574c2e0b9d20 100644 --- a/tools/build/Makefile.feature +++ b/tools/build/Makefile.feature @@ -96,7 +96,8 @@ FEATURE_TESTS_EXTRA := \ cxx \ llvm \ llvm-version \ - clang + clang \ + libbpf FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC) diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile index 8499385365c0..f30a89046aa3 100644 --- a/tools/build/feature/Makefile +++ b/tools/build/feature/Makefile @@ -53,6 +53,7 @@ FILES= \ test-zlib.bin \ test-lzma.bin \ test-bpf.bin \ + test-libbpf.bin \ test-get_cpuid.bin \ test-sdt.bin \ test-cxx.bin \ @@ -270,6 +271,9 @@ $(OUTPUT)test-get_cpuid.bin: $(OUTPUT)test-bpf.bin: $(BUILD) +$(OUTPUT)test-libbpf.bin: + $(BUILD) -lbpf + $(OUTPUT)test-sdt.bin: $(BUILD) diff --git a/tools/build/feature/test-libbpf.c b/tools/build/feature/test-libbpf.c new file mode 100644 index 000000000000..a508756cf4cc --- /dev/null +++ b/tools/build/feature/test-libbpf.c @@ -0,0 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0 +#include + +int main(void) +{ + return bpf_object__open("test") ? 0 : -1; +} diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config index 1783427da9b0..c90f4146e5a2 100644 --- a/tools/perf/Makefile.config +++ b/tools/perf/Makefile.config @@ -483,6 +483,16 @@ ifndef NO_LIBELF ifeq ($(feature-bpf), 1) CFLAGS += -DHAVE_LIBBPF_SUPPORT $(call detected,CONFIG_LIBBPF) + + # detecting libbpf without LIBBPF_DYNAMIC, so make VF=1 shows libbpf detection status + $(call feature_check,libbpf) + ifdef LIBBPF_DYNAMIC + ifeq ($(feature-libbpf), 1) + EXTLIBS += -lbpf + else + dummy := $(error Error: No libbpf devel library found, please install libbpf-devel); + endif + endif endif ifndef NO_DWARF diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf index 1cd294468a1f..eae5d5e95952 100644 --- a/tools/perf/Makefile.perf +++ b/tools/perf/Makefile.perf @@ -116,6 +116,8 @@ include ../scripts/utilities.mak # # Define TCMALLOC to enable tcmalloc heap profiling. # +# Define LIBBPF_DYNAMIC to enable libbpf dynamic linking. +# # As per kernel Makefile, avoid funny character set dependencies unexport LC_ALL @@ -360,7 +362,9 @@ export PERL_PATH PERFLIBS = $(LIBAPI) $(LIBTRACEEVENT) $(LIBSUBCMD) $(LIBPERF) ifndef NO_LIBBPF - PERFLIBS += $(LIBBPF) + ifndef LIBBPF_DYNAMIC + PERFLIBS += $(LIBBPF) + endif endif # We choose to avoid "if .. else if .. else .. endif endif" -- 2.21.0