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selftests/ftrace: Add selftest for testing eprobe events on synthetic events 

Add a test to test event probes, by creating a synthetic event across
sys_enter_openat and sys_exit_openat that passes the filename pointer from
the enter of the system call to the exit, and then add an event probe to
the synthetic event to make sure that the file name is seen.

Link: https://lore.kernel.org/linux-kselftest/20210819152825.526931866@goodmis.org/
Link: https://lkml.kernel.org/r/20210820204742.463259900@goodmis.org

Cc: "Tzvetomir Stoyanov" <tz.stoyanov@gmail.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: linux-kselftest@vger.kernel.org
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2021-08-20 16:46:49 -04:00
parent 079db70794
commit 8f022d3a76
1 changed files with 53 additions and 0 deletions
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53
tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-eprobe.tc Normal file
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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: event trigger - test inter-event histogram trigger eprobe on synthetic event
# requires: dynamic_events synthetic_events events/syscalls/sys_enter_openat/hist "e[:[<group>/]<event>] <attached-group>.<attached-event> [<args>]":README
echo 0 > events/enable
clear_dynamic_events
SYSTEM="syscalls"
START="sys_enter_openat"
END="sys_exit_openat"
FIELD="filename"
SYNTH="synth_open"
EPROBE="eprobe_open"
echo "$SYNTH u64 filename; s64 ret;" > synthetic_events
echo "hist:keys=common_pid:__arg__1=$FIELD" > events/$SYSTEM/$START/trigger
echo "hist:keys=common_pid:filename=\$__arg__1,ret=ret:onmatch($SYSTEM.$START).trace($SYNTH,\$filename,\$ret)" > events/$SYSTEM/$END/trigger
echo "e:$EPROBE synthetic/$SYNTH file=+0(\$filename):ustring ret=\$ret:s64" >> dynamic_events
grep -q "$SYNTH" dynamic_events
grep -q "$EPROBE" dynamic_events
test -d events/synthetic/$SYNTH
test -d events/eprobes/$EPROBE
echo 1 > events/eprobes/$EPROBE/enable
ls
echo 0 > events/eprobes/$EPROBE/enable
content=`grep '^ *ls-' trace | grep 'file='`
nocontent=`grep '^ *ls-' trace | grep 'file=' | grep -v -e '"/' -e '"."'` || true
if [ -z "$content" ]; then
exit_fail
fi
if [ ! -z "$nocontent" ]; then
exit_fail
fi
echo "-:$EPROBE" >> dynamic_events
echo '!'"hist:keys=common_pid:filename=\$__arg__1,ret=ret:onmatch($SYSTEM.$START).trace($SYNTH,\$filename,\$ret)" > events/$SYSTEM/$END/trigger
echo '!'"hist:keys=common_pid:__arg__1=$FIELD" > events/$SYSTEM/$START/trigger
echo '!'"$SYNTH u64 filename; s64 ret;" >> synthetic_events
! grep -q "$SYNTH" dynamic_events
! grep -q "$EPROBE" dynamic_events
! test -d events/synthetic/$SYNTH
! test -d events/eprobes/$EPROBE
clear_trace