linux-kernel - Re: [PATCH 9/9] perf build: Use feature dump file for build-test

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Date:	Thu, 14 Jan 2016 13:44:03 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	acme@...nel.org, linux-kernel@...r.kernel.org, pi3orama@....com,
	lizefan@...wei.com, Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 9/9] perf build: Use feature dump file for build-test

On Thu, Jan 14, 2016 at 06:24:00PM +0800, Wangnan (F) wrote:
> 
> 
> On 2016/1/14 18:19, Jiri Olsa wrote:
> >On Wed, Jan 13, 2016 at 12:17:22PM +0000, Wang Nan wrote:
> >
> >SNIP
> >
> >>+$(FEATURES_DUMP_FILE_STATIC):
> >>+	$(call clean)
> >>+	@cmd="cd $(PERF) && make FEATURE_DUMP_COPY=$@ $(O_OPT) LDFLAGS='-static' feature-dump"; \
> >>+	echo "- $@: $$cmd" && echo $$cmd && \
> >>+	( eval $$cmd ) 2>&1
> >>+
> >>+$(foreach t,$(run) $(run_O),$(eval \
> >>+	$(t): $(if $(findstring make_static,$(t)),\
> >>+		$(FEATURES_DUMP_FILE_STATIC),\
> >>+		$(FEATURES_DUMP_FILE))))
> >>+
> >>+$(foreach t,$(run),$(if $(findstring make_static,$(t)),\
> >>+			$(eval $(t) := $($(t)) FEATURES_DUMP=$(FEATURES_DUMP_FILE_STATIC)),\
> >>+			$(eval $(t) := $($(t)) FEATURES_DUMP=$(FEATURES_DUMP_FILE))))
> >>+
> >the BUILD_TEST_FEATURE_DUMP rebuild is not silent:
> >
> >[jolsa@...va perf]$ rm BUILD_TEST_FEATURE_DUMP
> >[jolsa@...va perf]$ make -f tests/make
> >Testing Makefile
> >- /home/jolsa/kernel/linux-perf/tools/perf/BUILD_TEST_FEATURE_DUMP: cd . && make FEATURE_DUMP_COPY=/home/jolsa/kernel/linux-perf/tools/perf/BUILD_TEST_FEATURE_DUMP  feature-dump
> >cd . && make FEATURE_DUMP_COPY=/home/jolsa/kernel/linux-perf/tools/perf/BUILD_TEST_FEATURE_DUMP feature-dump
> >   BUILD:   Doing 'make -j4' parallel build
> >
> >Auto-detecting system features:
> >...                         dwarf: [ on  ]
> >...                         glibc: [ on  ]
> >...                          gtk2: [ on  ]
> >...                      libaudit: [ on  ]
> >...                        libbfd: [ on  ]
> >...                        libelf: [ on  ]
> >...                       libnuma: [ on  ]
> >...        numa_num_possible_cpus: [ on  ]
> >...                       libperl: [ on  ]
> >...                     libpython: [ on  ]
> >...                      libslang: [ on  ]
> >...                     libunwind: [ on  ]
> >...            libdw-dwarf-unwind: [ on  ]
> >...                          zlib: [ on  ]
> >...                          lzma: [ on  ]
> >...                     get_cpuid: [ on  ]
> >...                           bpf: [ on  ]
> >
> >...
> >
> >
> >also should 'make clean' remove BUILD_TEST_FEATURE_DUMP?
> 
> If a simple 'make clean' removes these two feature dump file then
> they are unable to reused by multiple test cases. During build-test
> 'make clean' is called many times.
> 
> What about force removing these two files here:
> 
> ifeq ($(MAKECMDGOALS),)
> # no target specified, trigger the whole suite
> all:
>         @rm -f $(FEATURES_DUMP_FILE) $(FEATURES_DUMP_FILE_STATIC) <---
> *HERE*
>         @echo "Testing Makefile";      $(MAKE) -sf tests/make MK=Makefile
>         @echo "Testing Makefile.perf"; $(MAKE) -sf tests/make
> MK=Makefile.perf SET_PARALLEL=1 SET_O=1
> else
> # run only specific test over 'Makefile'
> %:
>         @rm -f $(FEATURES_DUMP_FILE) $(FEATURES_DUMP_FILE_STATIC) <--- *and
> HERE*
>         @echo "Testing Makefile";      $(MAKE) -sf tests/make MK=Makefile $@
> endif

wouldn't they be rebuilt right away?

I think it'd be ok just to remove them right after the test

jirka