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

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Date:   Mon, 30 Oct 2023 11:14:37 +0000
From:   Yang Jihong <yangjihong1@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>, <irogers@...gle.com>,
        <adrian.hunter@...el.com>, <linux-perf-users@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <yangjihong1@...wei.com>
Subject: [PATCH 1/2] perf build: Add loading python binding check to python.so build

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>
---
 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