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linux/tools/perf/tests/shell/base_probe/test_adding_kernel.sh
Athira Rajeev 90d32e9201 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@linux.vnet.ibm.com>
Reviewed-by: James Clark <james.clark@arm.com>
Cc: akanksha@linux.ibm.com
Cc: kjain@linux.ibm.com
Cc: maddy@linux.ibm.com
Cc: disgoel@linux.vnet.ibm.com
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240617122121.7484-1-atrajeev@linux.vnet.ibm.com
2024-06-20 10:05:04 -07:00

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#!/bin/bash
# Add 'perf probe's, list and remove them
# SPDX-License-Identifier: GPL-2.0
#
# test_adding_kernel of perf_probe test
# Author: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
# Author: Michael Petlan <mpetlan@redhat.com>
#
# Description:
#
# This test tests adding of probes, their correct listing
# and removing.
#
# include working environment
. ../common/init.sh
. ./settings.sh
# shellcheck disable=SC2034 # the variable is later used after the working environment is included
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
exit 0
fi
### basic probe adding
for opt in "" "-a" "--add"; do
clear_all_probes
$CMD_PERF probe $opt $TEST_PROBE 2> $LOGS_DIR/adding_kernel_add$opt.err
PERF_EXIT_CODE=$?
../common/check_all_patterns_found.pl "Added new events?:" "probe:$TEST_PROBE" "on $TEST_PROBE" < $LOGS_DIR/adding_kernel_add$opt.err
CHECK_EXIT_CODE=$?
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "adding probe $TEST_PROBE :: $opt"
(( TEST_RESULT += $? ))
done
### listing added probe :: perf list
# any added probes should appear in perf-list output
$CMD_PERF list probe:\* > $LOGS_DIR/adding_kernel_list.log
PERF_EXIT_CODE=$?
../common/check_all_lines_matched.pl "$RE_LINE_EMPTY" "List of pre-defined events" "probe:${TEST_PROBE}(?:_\d+)?\s+\[Tracepoint event\]" "Metric Groups:" < $LOGS_DIR/adding_kernel_list.log
CHECK_EXIT_CODE=$?
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "listing added probe :: perf list"
(( TEST_RESULT += $? ))
### listing added probe :: perf probe -l
# '-l' should list all the added probes as well
$CMD_PERF probe -l > $LOGS_DIR/adding_kernel_list-l.log
PERF_EXIT_CODE=$?
../common/check_all_patterns_found.pl "\s*probe:${TEST_PROBE}(?:_\d+)?\s+\(on ${TEST_PROBE}(?:[:\+]$RE_NUMBER_HEX)?@.+\)" < $LOGS_DIR/adding_kernel_list-l.log
CHECK_EXIT_CODE=$?
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 += $? ))
### using added probe
$CMD_PERF stat -e probe:$TEST_PROBE\* -o $LOGS_DIR/adding_kernel_using_probe.log -- cat /proc/uptime > /dev/null
PERF_EXIT_CODE=$?
REGEX_STAT_HEADER="\s*Performance counter stats for \'cat /proc/uptime\':"
REGEX_STAT_VALUES="\s*\d+\s+probe:$TEST_PROBE"
# the value should be greater than 1
REGEX_STAT_VALUE_NONZERO="\s*[1-9][0-9]*\s+probe:$TEST_PROBE"
REGEX_STAT_TIME="\s*$RE_NUMBER\s+seconds (?:time elapsed|user|sys)"
../common/check_all_lines_matched.pl "$REGEX_STAT_HEADER" "$REGEX_STAT_VALUES" "$REGEX_STAT_TIME" "$RE_LINE_COMMENT" "$RE_LINE_EMPTY" < $LOGS_DIR/adding_kernel_using_probe.log
CHECK_EXIT_CODE=$?
../common/check_all_patterns_found.pl "$REGEX_STAT_HEADER" "$REGEX_STAT_VALUE_NONZERO" "$REGEX_STAT_TIME" < $LOGS_DIR/adding_kernel_using_probe.log
(( CHECK_EXIT_CODE += $? ))
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "using added probe"
(( TEST_RESULT += $? ))
### removing added probe
# '-d' should remove the probe
$CMD_PERF probe -d $TEST_PROBE\* 2> $LOGS_DIR/adding_kernel_removing.err
PERF_EXIT_CODE=$?
../common/check_all_lines_matched.pl "Removed event: probe:$TEST_PROBE" < $LOGS_DIR/adding_kernel_removing.err
CHECK_EXIT_CODE=$?
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "deleting added probe"
(( TEST_RESULT += $? ))
### listing removed probe
# removed probes should NOT appear in perf-list output
$CMD_PERF list probe:\* > $LOGS_DIR/adding_kernel_list_removed.log
PERF_EXIT_CODE=$?
../common/check_all_lines_matched.pl "$RE_LINE_EMPTY" "List of pre-defined events" "Metric Groups:" < $LOGS_DIR/adding_kernel_list_removed.log
CHECK_EXIT_CODE=$?
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "listing removed probe (should NOT be listed)"
(( TEST_RESULT += $? ))
### dry run
# the '-n' switch should run it in dry mode
$CMD_PERF probe -n --add $TEST_PROBE 2> $LOGS_DIR/adding_kernel_dryrun.err
PERF_EXIT_CODE=$?
# check for the output (should be the same as usual)
../common/check_all_patterns_found.pl "Added new events?:" "probe:$TEST_PROBE" "on $TEST_PROBE" < $LOGS_DIR/adding_kernel_dryrun.err
CHECK_EXIT_CODE=$?
# check that no probe was added in real
! ( $CMD_PERF probe -l | grep "probe:$TEST_PROBE" )
(( CHECK_EXIT_CODE += $? ))
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "dry run :: adding probe"
(( TEST_RESULT += $? ))
### force-adding probes
# when using '--force' a probe should be added even if it is already there
$CMD_PERF probe --add $TEST_PROBE 2> $LOGS_DIR/adding_kernel_forceadd_01.err
PERF_EXIT_CODE=$?
../common/check_all_patterns_found.pl "Added new events?:" "probe:$TEST_PROBE" "on $TEST_PROBE" < $LOGS_DIR/adding_kernel_forceadd_01.err
CHECK_EXIT_CODE=$?
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "force-adding probes :: first probe adding"
(( TEST_RESULT += $? ))
# adding existing probe without '--force' should fail
! $CMD_PERF probe --add $TEST_PROBE 2> $LOGS_DIR/adding_kernel_forceadd_02.err
PERF_EXIT_CODE=$?
../common/check_all_patterns_found.pl "Error: event \"$TEST_PROBE\" already exists." "Error: Failed to add events." < $LOGS_DIR/adding_kernel_forceadd_02.err
CHECK_EXIT_CODE=$?
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "force-adding probes :: second probe adding (without force)"
(( TEST_RESULT += $? ))
# adding existing probe with '--force' should pass
NO_OF_PROBES=`$CMD_PERF probe -l | wc -l`
$CMD_PERF probe --force --add $TEST_PROBE 2> $LOGS_DIR/adding_kernel_forceadd_03.err
PERF_EXIT_CODE=$?
../common/check_all_patterns_found.pl "Added new events?:" "probe:${TEST_PROBE}_${NO_OF_PROBES}" "on $TEST_PROBE" < $LOGS_DIR/adding_kernel_forceadd_03.err
CHECK_EXIT_CODE=$?
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "force-adding probes :: second probe adding (with force)"
(( TEST_RESULT += $? ))
### using doubled probe
# since they are the same, they should produce the same results
$CMD_PERF stat -e probe:$TEST_PROBE -e probe:${TEST_PROBE}_${NO_OF_PROBES} -x';' -o $LOGS_DIR/adding_kernel_using_two.log -- bash -c 'cat /proc/cpuinfo > /dev/null'
PERF_EXIT_CODE=$?
REGEX_LINE="$RE_NUMBER;+probe:${TEST_PROBE}_?(?:$NO_OF_PROBES)?;$RE_NUMBER;$RE_NUMBER"
../common/check_all_lines_matched.pl "$REGEX_LINE" "$RE_LINE_EMPTY" "$RE_LINE_COMMENT" < $LOGS_DIR/adding_kernel_using_two.log
CHECK_EXIT_CODE=$?
VALUE_1=`grep "$TEST_PROBE;" $LOGS_DIR/adding_kernel_using_two.log | awk -F';' '{print $1}'`
VALUE_2=`grep "${TEST_PROBE}_${NO_OF_PROBES};" $LOGS_DIR/adding_kernel_using_two.log | awk -F';' '{print $1}'`
test $VALUE_1 -eq $VALUE_2
(( CHECK_EXIT_CODE += $? ))
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "using doubled probe"
### removing multiple probes
# using wildcards should remove all matching probes
$CMD_PERF probe --del \* 2> $LOGS_DIR/adding_kernel_removing_wildcard.err
PERF_EXIT_CODE=$?
../common/check_all_lines_matched.pl "Removed event: probe:$TEST_PROBE" "Removed event: probe:${TEST_PROBE}_1" < $LOGS_DIR/adding_kernel_removing_wildcard.err
CHECK_EXIT_CODE=$?
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "removing multiple probes"
(( TEST_RESULT += $? ))
### wildcard adding support
$CMD_PERF probe -nf --max-probes=512 -a 'vfs_* $params' 2> $LOGS_DIR/adding_kernel_adding_wildcard.err
PERF_EXIT_CODE=$?
../common/check_all_patterns_found.pl "probe:vfs_mknod" "probe:vfs_create" "probe:vfs_rmdir" "probe:vfs_link" "probe:vfs_write" < $LOGS_DIR/adding_kernel_adding_wildcard.err
CHECK_EXIT_CODE=$?
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 += $? ))
### non-existing variable
# perf probe should survive a non-existing variable probing attempt
{ $CMD_PERF probe 'vfs_read somenonexistingrandomstuffwhichisalsoprettylongorevenlongertoexceed64' ; } 2> $LOGS_DIR/adding_kernel_nonexisting.err
PERF_EXIT_CODE=$?
# the exitcode should not be 0 or segfault
test $PERF_EXIT_CODE -ne 139 -a $PERF_EXIT_CODE -ne 0
PERF_EXIT_CODE=$?
# check that the error message is reasonable
../common/check_all_patterns_found.pl "Failed to find" "somenonexistingrandomstuffwhichisalsoprettylongorevenlongertoexceed64" < $LOGS_DIR/adding_kernel_nonexisting.err
CHECK_EXIT_CODE=$?
../common/check_all_patterns_found.pl "in this function|at this address" "Error" "Failed to add events" < $LOGS_DIR/adding_kernel_nonexisting.err
(( CHECK_EXIT_CODE += $? ))
../common/check_all_lines_matched.pl "Failed to find" "Error" "Probe point .+ not found" "optimized out" "Use.+\-\-range option to show.+location range" < $LOGS_DIR/adding_kernel_nonexisting.err
(( CHECK_EXIT_CODE += $? ))
../common/check_no_patterns_found.pl "$RE_SEGFAULT" < $LOGS_DIR/adding_kernel_nonexisting.err
(( CHECK_EXIT_CODE += $? ))
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 += $? ))
### function with return value
# adding probe with return value
$CMD_PERF probe --add "$TEST_PROBE%return \$retval" 2> $LOGS_DIR/adding_kernel_func_retval_add.err
PERF_EXIT_CODE=$?
../common/check_all_patterns_found.pl "Added new events?:" "probe:$TEST_PROBE" "on $TEST_PROBE%return with \\\$retval" < $LOGS_DIR/adding_kernel_func_retval_add.err
CHECK_EXIT_CODE=$?
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "function with retval :: add"
(( TEST_RESULT += $? ))
# recording some data
$CMD_PERF record -e probe:$TEST_PROBE\* -o $CURRENT_TEST_DIR/perf.data -- cat /proc/cpuinfo > /dev/null 2> $LOGS_DIR/adding_kernel_func_retval_record.err
PERF_EXIT_CODE=$?
../common/check_all_patterns_found.pl "$RE_LINE_RECORD1" "$RE_LINE_RECORD2" < $LOGS_DIR/adding_kernel_func_retval_record.err
CHECK_EXIT_CODE=$?
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "function with retval :: record"
(( TEST_RESULT += $? ))
# perf script should report the function calls with the correct arg values
$CMD_PERF script -i $CURRENT_TEST_DIR/perf.data > $LOGS_DIR/adding_kernel_func_retval_script.log
PERF_EXIT_CODE=$?
REGEX_SCRIPT_LINE="\s*cat\s+$RE_NUMBER\s+\[$RE_NUMBER\]\s+$RE_NUMBER:\s+probe:$TEST_PROBE\w*:\s+\($RE_NUMBER_HEX\s+<\-\s+$RE_NUMBER_HEX\)\s+arg1=$RE_NUMBER_HEX"
../common/check_all_lines_matched.pl "$REGEX_SCRIPT_LINE" < $LOGS_DIR/adding_kernel_func_retval_script.log
CHECK_EXIT_CODE=$?
../common/check_all_patterns_found.pl "$REGEX_SCRIPT_LINE" < $LOGS_DIR/adding_kernel_func_retval_script.log
(( CHECK_EXIT_CODE += $? ))
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "function argument probing :: script"
(( TEST_RESULT += $? ))
clear_all_probes
# print overall results
print_overall_results "$TEST_RESULT"
exit $?
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