Date: Mon, 17 Jun 2024 17:51:21 +0530
From: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
To: acme@...nel.org, jolsa@...nel.org, adrian.hunter@...el.com,
        irogers@...gle.com, namhyung@...nel.org
Cc: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, akanksha@...ux.ibm.com,
        maddy@...ux.ibm.com, atrajeev@...ux.vnet.ibm.com, kjain@...ux.ibm.com,
        disgoel@...ux.vnet.ibm.com
Subject: [PATCH] tools/perf: Handle perftool-testsuite_probe testcases fail when kernel debuginfo is not present

Running "perftool-testsuite_probe" fails as below:

	./perf test -v "perftool-testsuite_probe"
	83: perftool-testsuite_probe  : FAILED

There are three fails:

1. Regexp not found: "\s*probe:inode_permission(?:_\d+)?\s+\(on inode_permission(?:[:\+][0-9A-Fa-f]+)?@.+\)"
   -- [ FAIL ] -- perf_probe :: test_adding_kernel :: listing added probe :: perf probe -l (output regexp parsing)

2. Regexp not found: "probe:vfs_mknod"
   Regexp not found: "probe:vfs_create"
   Regexp not found: "probe:vfs_rmdir"
   Regexp not found: "probe:vfs_link"
   Regexp not found: "probe:vfs_write"
   -- [ FAIL ] -- perf_probe :: test_adding_kernel :: wildcard adding support (command exitcode + output regexp parsing)

3. Regexp not found: "Failed to find"
   Regexp not found: "somenonexistingrandomstuffwhichisalsoprettylongorevenlongertoexceed64"
   Regexp not found: "in this function|at this address"
   Line did not match any pattern: "The /boot/vmlinux file has no debug information."
   Line did not match any pattern: "Rebuild with CONFIG_DEBUG_INFO=y, or install an appropriate debuginfo package."

These three tests depends on kernel debug info.
1. Fail 1 expects file name along with probe which needs debuginfo
2. Fail 2 :
    perf probe -nf --max-probes=512 -a 'vfs_* $params'
    Debuginfo-analysis is not supported.
     Error: Failed to add events.

3. Fail 3 :
   perf probe 'vfs_read somenonexistingrandomstuffwhichisalsoprettylongorevenlongertoexceed64'
   Debuginfo-analysis is not supported.
   Error: Failed to add events.

There is already helper function skip_if_no_debuginfo in
lib/probe_vfs_getname.sh which does perf probe and returns
"2" if debug info is not present. Use the skip_if_no_debuginfo
function and skip only the three tests which needs debuginfo
based on the result.

With the patch:

    83: perftool-testsuite_probe:
   --- start ---
   test child forked, pid 3927
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: adding probe inode_permission ::
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: adding probe inode_permission :: -a
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: adding probe inode_permission :: --add
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: listing added probe :: perf list
   Regexp not found: "\s*probe:inode_permission(?:_\d+)?\s+\(on inode_permission(?:[:\+][0-9A-Fa-f]+)?@.+\)"
   -- [ SKIP ] -- perf_probe :: test_adding_kernel :: 2 2 Skipped due to missing debuginfo :: testcase skipped
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: using added probe
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: deleting added probe
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: listing removed probe (should NOT be listed)
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: dry run :: adding probe
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: force-adding probes :: first probe adding
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: force-adding probes :: second probe adding (without force)
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: force-adding probes :: second probe adding (with force)
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: using doubled probe
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: removing multiple probes
   Regexp not found: "probe:vfs_mknod"
   Regexp not found: "probe:vfs_create"
   Regexp not found: "probe:vfs_rmdir"
   Regexp not found: "probe:vfs_link"
   Regexp not found: "probe:vfs_write"
   -- [ SKIP ] -- perf_probe :: test_adding_kernel :: 2 2 Skipped due to missing debuginfo :: testcase skipped
   Regexp not found: "Failed to find"
   Regexp not found: "somenonexistingrandomstuffwhichisalsoprettylongorevenlongertoexceed64"
   Regexp not found: "in this function|at this address"
   Line did not match any pattern: "The /boot/vmlinux file has no debug information."
   Line did not match any pattern: "Rebuild with CONFIG_DEBUG_INFO=y, or install an appropriate debuginfo package."
   -- [ SKIP ] -- perf_probe :: test_adding_kernel :: 2 2 Skipped due to missing debuginfo :: testcase skipped
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: function with retval :: add
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: function with retval :: record
   -- [ PASS ] -- perf_probe :: test_adding_kernel :: function argument probing :: script
   ## [ PASS ] ## perf_probe :: test_adding_kernel SUMMARY
   ---- end(0) ----
   83: perftool-testsuite_probe                                        : Ok

Only the three specific tests are skipped and remaining
ran successfully.

Signed-off-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
---
 .../shell/base_probe/test_adding_kernel.sh    | 31 +++++++++++++++++--
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/tools/perf/tests/shell/base_probe/test_adding_kernel.sh b/tools/perf/tests/shell/base_probe/test_adding_kernel.sh
index 63bb8974b38e..187dc8d4b163 100755
--- a/tools/perf/tests/shell/base_probe/test_adding_kernel.sh
+++ b/tools/perf/tests/shell/base_probe/test_adding_kernel.sh
@@ -21,8 +21,18 @@
 THIS_TEST_NAME=`basename $0 .sh`
 TEST_RESULT=0
 
+# shellcheck source=lib/probe_vfs_getname.sh
+. "$(dirname "$0")/../lib/probe_vfs_getname.sh"
+
 TEST_PROBE=${TEST_PROBE:-"inode_permission"}
 
+# set NO_DEBUGINFO to skip testcase if debuginfo is not present
+# skip_if_no_debuginfo returns 2 if debuginfo is not present
+skip_if_no_debuginfo
+if [ $? -eq 2 ]; then
+	NO_DEBUGINFO=1
+fi
+
 check_kprobes_available
 if [ $? -ne 0 ]; then
 	print_overall_skipped
@@ -67,7 +77,12 @@ PERF_EXIT_CODE=$?
 ../common/check_all_patterns_found.pl "\s*probe:${TEST_PROBE}(?:_\d+)?\s+\(on ${TEST_PROBE}(?:[:\+]$RE_NUMBER_HEX)?@.+\)" < $LOGS_DIR/adding_kernel_list-l.log
 CHECK_EXIT_CODE=$?
 
-print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "listing added probe :: perf probe -l"
+if [ $NO_DEBUGINFO ] ; then
+	print_testcase_skipped $NO_DEBUGINFO $NO_DEBUGINFO "Skipped due to missing debuginfo"
+else
+	print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "listing added probe :: perf probe -l"
+fi
+
 (( TEST_RESULT += $? ))
 
 
@@ -208,7 +223,12 @@ PERF_EXIT_CODE=$?
 ../common/check_all_patterns_found.pl "probe:vfs_mknod" "probe:vfs_create" "probe:vfs_rmdir" "probe:vfs_link" "probe:vfs_write" < $LOGS_DIR/adding_kernel_adding_wildcard.err
 CHECK_EXIT_CODE=$?
 
-print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "wildcard adding support"
+if [ $NO_DEBUGINFO ] ; then
+	print_testcase_skipped $NO_DEBUGINFO $NO_DEBUGINFO "Skipped due to missing debuginfo"
+else
+	print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "wildcard adding support"
+fi
+
 (( TEST_RESULT += $? ))
 
 
@@ -232,7 +252,12 @@ CHECK_EXIT_CODE=$?
 ../common/check_no_patterns_found.pl "$RE_SEGFAULT" < $LOGS_DIR/adding_kernel_nonexisting.err
 (( CHECK_EXIT_CODE += $? ))
 
-print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "non-existing variable"
+if [ $NO_DEBUGINFO ]; then
+	print_testcase_skipped $NO_DEBUGINFO $NO_DEBUGINFO "Skipped due to missing debuginfo"
+else
+	print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "non-existing variable"
+fi
+
 (( TEST_RESULT += $? ))
 
 
-- 
2.35.3

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