linux-kernel - [PATCH bpf-next 2/3] tools: runqslower: build and use lightweight bootstrap version of bpftool

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Message-ID: <20220712030813.865410-3-pulehui@huawei.com>
Date:   Tue, 12 Jul 2022 11:08:12 +0800
From:   Pu Lehui <pulehui@...wei.com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Quentin Monnet <quentin@...valent.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        "Jean-Philippe Brucker" <jean-philippe@...aro.org>,
        Pu Lehui <pulehui@...wei.com>
Subject: [PATCH bpf-next 2/3] tools: runqslower: build and use lightweight bootstrap version of bpftool

tools/runqslower use bpftool for vmlinux.h, skeleton, and static linking
only. So we can use lightweight bootstrap version of bpftool to handle
these, and it will be faster.

Signed-off-by: Pu Lehui <pulehui@...wei.com>
Suggested-by: Andrii Nakryiko <andrii@...nel.org>
---
 tools/bpf/runqslower/Makefile | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/bpf/runqslower/Makefile b/tools/bpf/runqslower/Makefile
index da6de16a3dfb..8900c74f29e2 100644
--- a/tools/bpf/runqslower/Makefile
+++ b/tools/bpf/runqslower/Makefile
@@ -4,7 +4,7 @@ include ../../scripts/Makefile.include
 OUTPUT ?= $(abspath .output)/
 
 BPFTOOL_OUTPUT := $(OUTPUT)bpftool/
-DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)bpftool
+DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)bootstrap/bpftool
 BPFTOOL ?= $(DEFAULT_BPFTOOL)
 LIBBPF_SRC := $(abspath ../../lib/bpf)
 BPFOBJ_OUTPUT := $(OUTPUT)libbpf/
@@ -86,6 +86,12 @@ $(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(BPFOBJ_OU
 	$(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) OUTPUT=$(BPFOBJ_OUTPUT) \
 		    DESTDIR=$(BPFOBJ_OUTPUT) prefix= $(abspath $@) install_headers
 
+ifeq ($(CROSS_COMPILE),)
 $(DEFAULT_BPFTOOL): $(BPFOBJ) | $(BPFTOOL_OUTPUT)
 	$(Q)$(MAKE) $(submake_extras) -C ../bpftool OUTPUT=$(BPFTOOL_OUTPUT)   \
-		    ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD)
+		    LIBBPF_BOOTSTRAP_OUTPUT=$(BPFOBJ_OUTPUT)		       \
+		    LIBBPF_BOOTSTRAP_DESTDIR=$(BPF_DESTDIR) bootstrap
+else
+$(DEFAULT_BPFTOOL): | $(BPFTOOL_OUTPUT)
+	$(Q)$(MAKE) $(submake_extras) -C ../bpftool OUTPUT=$(BPFTOOL_OUTPUT) bootstrap
+endif
-- 
2.25.1