Commit 8f022d3a authored by Steven Rostedt (VMware)'s avatar Steven Rostedt (VMware)
Browse files

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: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 079db707

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-eprobe.tc

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+53 −0
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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