linux-kernel - [PATCH] perf/test: reduce run time of perf test Test java symbol

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Date:   Tue,  9 May 2023 15:18:47 +0200
From:   Thomas Richter <tmricht@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org, leo.yan@...aro.org, irogers@...gle.com
Cc:     svens@...ux.ibm.com, gor@...ux.ibm.com, sumanthk@...ux.ibm.com,
        hca@...ux.ibm.com, Thomas Richter <tmricht@...ux.ibm.com>
Subject: [PATCH] perf/test: reduce run time of perf test Test java symbol

Test case Test java symbol might run a long time. On Fedora 38 the
run time is very, very long:

 Output before:
 # time ./perf test 108
 108: Test java symbol                  : Ok
 real   22m15.775s
 user   3m42.584s
 sys    4m30.685s
 #

The reason is a lookup for the server for debug symbols as shown in
 # cat /etc/debuginfod/elfutils.urls
 https://debuginfod.fedoraproject.org/
 #
This lookup is done for every symbol/sample, so about 3500 lookups
will take place.
To omit this lookup, which is not needed, unset environment variable
DEBUGINFOD_URLS=''.

 Output after:
 # time ./perf test 108
 108: Test java symbol                  : Ok

 real	0m6.242s
 user	0m4.982s
 sys	0m3.243s
 #

Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
Cc: leo.yan@...aro.org
Cc: irogers@...gle.com
---
 tools/perf/tests/shell/test_java_symbol.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/tests/shell/test_java_symbol.sh b/tools/perf/tests/shell/test_java_symbol.sh
index 90cea8811926..499539d1c479 100755
--- a/tools/perf/tests/shell/test_java_symbol.sh
+++ b/tools/perf/tests/shell/test_java_symbol.sh
@@ -56,7 +56,7 @@ if [ $? -ne 0 ]; then
 	exit 1
 fi
 
-if ! perf inject -i $PERF_DATA -o $PERF_INJ_DATA -j; then
+if ! DEBUGINFOD_URLS='' perf inject -i $PERF_DATA -o $PERF_INJ_DATA -j; then
 	echo "Fail to inject samples"
 	exit 1
 fi
-- 
2.40.0