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Date:   Mon, 22 Jul 2019 17:54:17 +0200
From:   Jiri Olsa <jolsa@redhat.com>
To:     Arnaldo Carvalho de Melo <acme@kernel.org>
Cc:     Jiri Olsa <jolsa@kernel.org>, lkml <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Andi Kleen <ak@linux.intel.com>,
        Alexey Budankov <alexey.budankov@linux.intel.com>,
        Michael Petlan <mpetlan@redhat.com>
Subject: Re: [PATCH 23/79] libperf: Make libperf.a part of the build
Message-ID: <20190722155417.GA2121@krava>
References: <20190721112506.12306-1-jolsa@kernel.org>
 <20190721112506.12306-24-jolsa@kernel.org>
 <20190722123924.GA28864@kernel.org>
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On Mon, Jul 22, 2019 at 09:39:24AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Sun, Jul 21, 2019 at 01:24:10PM +0200, Jiri Olsa escreveu:
> > Adding empty libperf.a under toos/perf/lib and
> > linking it with perf.
> 
> So, I noticed you created a subdirectory under tools/perf/, while I
> first thought you would have it in tools/lib/perf/, why not move it
> there?

yea I started like this, and then there was only one reason
I could think of ;-) I mentioned it in the cover letter:
  - move under tools/lib after the interface is more stable-ish

if you insist to move it there now, would it be ok
to make it under separate patch afterwards? it would
safe me zillions of small changes ;-)

thanks,
jirka

> 
> - Arnaldo
>  
> > It can also be built separately with:
> > 
> >   $ cd tools/perf/lib && make
> >     CC       core.o
> >     LD       libperf-in.o
> >     AR       libperf.a
> >     LINK     libperf.so
> > 
> > Link: http://lkml.kernel.org/n/tip-lzrlfu3hutepbeqyntjks3za@git.kernel.org
> > Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> > ---
> >  tools/perf/Makefile.config |  1 +
> >  tools/perf/Makefile.perf   | 30 ++++++++--------
> >  tools/perf/lib/Build       |  1 +
> >  tools/perf/lib/Makefile    | 74 ++++++++++++++++++++++++++++++++++++++
> >  tools/perf/lib/core.c      |  0
> >  5 files changed, 92 insertions(+), 14 deletions(-)
> >  create mode 100644 tools/perf/lib/Build
> >  create mode 100644 tools/perf/lib/Makefile
> >  create mode 100644 tools/perf/lib/core.c
> > 
> > diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> > index 89ac5a1f1550..e4988f49ea79 100644
> > --- a/tools/perf/Makefile.config
> > +++ b/tools/perf/Makefile.config
> > @@ -277,6 +277,7 @@ ifeq ($(DEBUG),0)
> >    endif
> >  endif
> >  
> > +INC_FLAGS += -I$(src-perf)/lib/include
> >  INC_FLAGS += -I$(src-perf)/util/include
> >  INC_FLAGS += -I$(src-perf)/arch/$(SRCARCH)/include
> >  INC_FLAGS += -I$(srctree)/tools/include/uapi
> > diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> > index 0fffd2bb6cd9..6e7e7d44ffac 100644
> > --- a/tools/perf/Makefile.perf
> > +++ b/tools/perf/Makefile.perf
> > @@ -224,6 +224,7 @@ LIB_DIR         = $(srctree)/tools/lib/api/
> >  TRACE_EVENT_DIR = $(srctree)/tools/lib/traceevent/
> >  BPF_DIR         = $(srctree)/tools/lib/bpf/
> >  SUBCMD_DIR      = $(srctree)/tools/lib/subcmd/
> > +LIBPERF_DIR     = $(srctree)/tools/perf/lib/
> >  
> >  # Set FEATURE_TESTS to 'all' so all possible feature checkers are executed.
> >  # Without this setting the output feature dump file misses some features, for
> > @@ -272,6 +273,7 @@ ifneq ($(OUTPUT),)
> >    TE_PATH=$(OUTPUT)
> >    BPF_PATH=$(OUTPUT)
> >    SUBCMD_PATH=$(OUTPUT)
> > +  LIBPERF_PATH=$(OUTPUT)
> >  ifneq ($(subdir),)
> >    API_PATH=$(OUTPUT)/../lib/api/
> >  else
> > @@ -282,6 +284,7 @@ else
> >    API_PATH=$(LIB_DIR)
> >    BPF_PATH=$(BPF_DIR)
> >    SUBCMD_PATH=$(SUBCMD_DIR)
> > +  LIBPERF_PATH=$(LIBPERF_DIR)
> >  endif
> >  
> >  LIBTRACEEVENT = $(TE_PATH)libtraceevent.a
> > @@ -303,6 +306,8 @@ LIBBPF = $(BPF_PATH)libbpf.a
> >  
> >  LIBSUBCMD = $(SUBCMD_PATH)libsubcmd.a
> >  
> > +LIBPERF = $(LIBPERF_PATH)libperf.a
> > +
> >  # python extension build directories
> >  PYTHON_EXTBUILD     := $(OUTPUT)python_ext_build/
> >  PYTHON_EXTBUILD_LIB := $(PYTHON_EXTBUILD)lib/
> > @@ -348,9 +353,7 @@ endif
> >  
> >  export PERL_PATH
> >  
> > -LIBPERF_A=$(OUTPUT)libperf.a
> > -
> > -PERFLIBS = $(LIBAPI) $(LIBTRACEEVENT) $(LIBSUBCMD)
> > +PERFLIBS = $(LIBAPI) $(LIBTRACEEVENT) $(LIBSUBCMD) $(LIBPERF)
> >  ifndef NO_LIBBPF
> >    PERFLIBS += $(LIBBPF)
> >  endif
> > @@ -583,8 +586,6 @@ JEVENTS_IN    := $(OUTPUT)pmu-events/jevents-in.o
> >  
> >  PMU_EVENTS_IN := $(OUTPUT)pmu-events/pmu-events-in.o
> >  
> > -LIBPERF_IN := $(OUTPUT)libperf-in.o
> > -
> >  export JEVENTS
> >  
> >  build := -f $(srctree)/tools/build/Makefile.build dir=. obj
> > @@ -601,12 +602,9 @@ $(JEVENTS): $(JEVENTS_IN)
> >  $(PMU_EVENTS_IN): $(JEVENTS) FORCE
> >  	$(Q)$(MAKE) -f $(srctree)/tools/build/Makefile.build dir=pmu-events obj=pmu-events
> >  
> > -$(LIBPERF_IN): prepare FORCE
> > -	$(Q)$(MAKE) $(build)=libperf
> > -
> > -$(OUTPUT)perf: $(PERFLIBS) $(PERF_IN) $(PMU_EVENTS_IN) $(LIBPERF_IN) $(LIBTRACEEVENT_DYNAMIC_LIST)
> > +$(OUTPUT)perf: $(PERFLIBS) $(PERF_IN) $(PMU_EVENTS_IN) $(LIBTRACEEVENT_DYNAMIC_LIST)
> >  	$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $(LIBTRACEEVENT_DYNAMIC_LIST_LDFLAGS) \
> > -		$(PERF_IN) $(PMU_EVENTS_IN) $(LIBPERF_IN) $(LIBS) -o $@
> > +		$(PERF_IN) $(PMU_EVENTS_IN) $(LIBS) -o $@
> >  
> >  $(GTK_IN): FORCE
> >  	$(Q)$(MAKE) $(build)=gtk
> > @@ -727,9 +725,6 @@ endif
> >  
> >  $(patsubst perf-%,%.o,$(PROGRAMS)): $(wildcard */*.h)
> >  
> > -$(LIBPERF_A): $(LIBPERF_IN)
> > -	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $(LIBPERF_IN) $(LIB_OBJS)
> > -
> >  LIBTRACEEVENT_FLAGS += plugin_dir=$(plugindir_SQ) 'EXTRA_CFLAGS=$(EXTRA_CFLAGS)' 'LDFLAGS=$(LDFLAGS)'
> >  
> >  $(LIBTRACEEVENT): FORCE
> > @@ -762,6 +757,13 @@ $(LIBBPF)-clean:
> >  	$(call QUIET_CLEAN, libbpf)
> >  	$(Q)$(MAKE) -C $(BPF_DIR) O=$(OUTPUT) clean >/dev/null
> >  
> > +$(LIBPERF): FORCE
> > +	$(Q)$(MAKE) -C $(LIBPERF_DIR) O=$(OUTPUT) $(OUTPUT)libperf.a
> > +
> > +$(LIBPERF)-clean:
> > +	$(call QUIET_CLEAN, libperf)
> > +	$(Q)$(MAKE) -C $(LIBPERF_DIR) O=$(OUTPUT) clean >/dev/null
> > +
> >  $(LIBSUBCMD): FORCE
> >  	$(Q)$(MAKE) -C $(SUBCMD_DIR) O=$(OUTPUT) $(OUTPUT)libsubcmd.a
> >  
> > @@ -948,7 +950,7 @@ config-clean:
> >  python-clean:
> >  	$(python-clean)
> >  
> > -clean:: $(LIBTRACEEVENT)-clean $(LIBAPI)-clean $(LIBBPF)-clean $(LIBSUBCMD)-clean config-clean fixdep-clean python-clean
> > +clean:: $(LIBTRACEEVENT)-clean $(LIBAPI)-clean $(LIBBPF)-clean $(LIBSUBCMD)-clean $(LIBPERF)-clean config-clean fixdep-clean python-clean
> >  	$(call QUIET_CLEAN, core-objs)  $(RM) $(LIBPERF_A) $(OUTPUT)perf-archive $(OUTPUT)perf-with-kcore $(LANG_BINDINGS)
> >  	$(Q)find $(if $(OUTPUT),$(OUTPUT),.) -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
> >  	$(Q)$(RM) $(OUTPUT).config-detected
> > diff --git a/tools/perf/lib/Build b/tools/perf/lib/Build
> > new file mode 100644
> > index 000000000000..5196958cec01
> > --- /dev/null
> > +++ b/tools/perf/lib/Build
> > @@ -0,0 +1 @@
> > +libperf-y += core.o
> > diff --git a/tools/perf/lib/Makefile b/tools/perf/lib/Makefile
> > new file mode 100644
> > index 000000000000..e6f2eb702aaa
> > --- /dev/null
> > +++ b/tools/perf/lib/Makefile
> > @@ -0,0 +1,74 @@
> > +# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
> > +# Most of this file is copied from tools/lib/bpf/Makefile
> > +
> > +MAKEFLAGS += --no-print-directory
> > +
> > +ifeq ($(srctree),)
> > +srctree := $(patsubst %/,%,$(dir $(CURDIR)))
> > +srctree := $(patsubst %/,%,$(dir $(srctree)))
> > +srctree := $(patsubst %/,%,$(dir $(srctree)))
> > +#$(info Determined 'srctree' to be $(srctree))
> > +endif
> > +
> > +include $(srctree)/tools/scripts/Makefile.include
> > +include $(srctree)/tools/scripts/Makefile.arch
> > +
> > +ifeq ("$(origin V)", "command line")
> > +  VERBOSE = $(V)
> > +endif
> > +ifndef VERBOSE
> > +  VERBOSE = 0
> > +endif
> > +
> > +ifeq ($(VERBOSE),1)
> > +  Q =
> > +else
> > +  Q = @
> > +endif
> > +
> > +# Set compile option CFLAGS
> > +ifdef EXTRA_CFLAGS
> > +  CFLAGS := $(EXTRA_CFLAGS)
> > +else
> > +  CFLAGS := -g -Wall
> > +endif
> > +
> > +INCLUDES = -I. -Iinclude -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/
> > +
> > +# Append required CFLAGS
> > +override CFLAGS += $(EXTRA_WARNINGS)
> > +override CFLAGS += -Werror -Wall
> > +override CFLAGS += -fPIC
> > +override CFLAGS += $(INCLUDES)
> > +override CFLAGS += -fvisibility=hidden
> > +
> > +all:
> > +
> > +export srctree OUTPUT CC LD CFLAGS V
> > +include $(srctree)/tools/build/Makefile.include
> > +
> > +LIBPERF_SO := $(OUTPUT)libperf.so
> > +LIBPERF_A  := $(OUTPUT)libperf.a
> > +LIBPERF_IN := $(OUTPUT)libperf-in.o
> > +
> > +$(LIBPERF_IN): FORCE
> > +	$(Q)$(MAKE) $(build)=libperf
> > +
> > +$(LIBPERF_A): $(LIBPERF_IN)
> > +	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $(LIBPERF_IN)
> > +
> > +$(LIBPERF_SO): $(LIBPERF_IN)
> > +	$(QUIET_LINK)$(CC) --shared -Wl,-soname,libperf.so $^ -o $@
> > +
> > +libs: $(LIBPERF_A) $(LIBPERF_SO)
> > +
> > +all: fixdep
> > +	$(Q)$(MAKE) libs
> > +
> > +clean:
> > +	$(call QUIET_CLEAN, libperf) $(RM) $(LIBPERF_A) \
> > +                *.o *~ *.a *.so .*.d .*.cmd LIBPERF-CFLAGS
> > +
> > +FORCE:
> > +
> > +.PHONY: all install clean FORCE
> > diff --git a/tools/perf/lib/core.c b/tools/perf/lib/core.c
> > new file mode 100644
> > index 000000000000..e69de29bb2d1
> > -- 
> > 2.21.0
> 
> -- 
> 
> - Arnaldo