linux-kernel - Re: [PATCH 1/2] perf build: Add loading python binding check to python.so build

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Date:   Tue, 31 Oct 2023 21:51:07 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Yang Jihong <yangjihong1@...wei.com>
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, irogers@...gle.com, adrian.hunter@...el.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf build: Add loading python binding check to
 python.so build

Hello,

On Mon, Oct 30, 2023 at 4:16 AM Yang Jihong <yangjihong1@...wei.com> wrote:
>
> Add loading python binding check to python.so build so that problem can be
> detected in advance in the build phase instead of being left to `perf test`
> phase.
>
> In normal scenarios, the original build is not affected:
>
>   $ cd tools/perf
>   $ rm -rf /tmp/perf; mkdir /tmp/perf; make O=/tmp/perf
>   $ echo $?
>   0
>   $ cd /tmp/perf
>   $ ./perf test python
>    19: 'import perf' in python                    : Ok
>
> Create an error scenario, for example, delete util/rlimit.c from
> util/python-ext-sources:
>
>   $ cd tools/perf
>   $ sed -i 's@...l/rlimit.c@...il/rlimit.c@g' util/python-ext-sources
>   $ grep rlimit util/python-ext-sources
>   #util/rlimit.c
>   $ rm -rf /tmp/perf; mkdir /tmp/perf; make JOBS=1 O=/tmp/perf
>   <SNIP>
>     GEN     /tmp/perf/python/perf.cpython-310-x86_64-linux-gnu.so
>   Error: Load python binding failed. See /tmp/perf/python_ext_build/lib//build.log for more details
>   make[2]: *** [Makefile.perf:644: /tmp/perf/python/perf.cpython-310-x86_64-linux-gnu.so] Error 1
>   make[1]: *** [Makefile.perf:242: sub-make] Error 2
>   make: *** [Makefile:70: all] Error 2
>   $ cat /tmp/perf/python_ext_build/lib//build.log
>   Traceback (most recent call last):
>     File "<string>", line 1, in <module>
>   ImportError: /tmp/perf/python_ext_build/lib/perf.cpython-310-x86_64-linux-gnu.so: undefined symbol: rlimit__increase_nofile
>
> Signed-off-by: Yang Jihong <yangjihong1@...wei.com>

For both patches,
Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung


> ---
>  tools/perf/Makefile.perf | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index d80dcaa5a1e3..a2449c4890ad 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -645,7 +645,13 @@ $(OUTPUT)python/perf$(PYTHON_EXTENSION_SUFFIX): $(PYTHON_EXT_SRCS) $(PYTHON_EXT_
>          CFLAGS='$(CFLAGS)' LDFLAGS='$(LDFLAGS)' \
>           $(PYTHON_WORD) util/setup.py \
>           --quiet build_ext; \
> -       cp $(PYTHON_EXTBUILD_LIB)perf*.so $(OUTPUT)python/
> +       $(PYTHON_WORD) -c 'import sys; sys.path.insert(0, "$(PYTHON_EXTBUILD_LIB)"); import perf' 2>$(PYTHON_EXTBUILD_LIB)/build.log; \
> +       if [ $$? -ne 0 ]; then \
> +               echo "Error: Load python binding failed. See $(PYTHON_EXTBUILD_LIB)/build.log for more details"; \
> +               exit 1; \
> +       else \
> +               cp $(PYTHON_EXTBUILD_LIB)perf*.so $(OUTPUT)python/; \
> +       fi
>
>  python_perf_target:
>         @echo "Target is: $(OUTPUT)python/perf$(PYTHON_EXTENSION_SUFFIX)"
> --
> 2.34.1
>