| Message ID | 20210819152825.526931866@goodmis.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | tracing: Creation of event probe | expand |
On Thu, 19 Aug 2021 11:26:08 -0400 Steven Rostedt <rostedt@goodmis.org> wrote: > From: "Steven Rostedt (VMware)" <rostedt@goodmis.org> > > 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://lkml.kernel.org/r/20210819041842.884828019@goodmis.org > > Cc: Shuah Khan <shuah@kernel.org> > Cc: Shuah Khan <skhan@linuxfoundation.org> > Cc: linux-kselftest@vger.kernel.org > Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> > --- > .../test.d/dynevent/add_remove_eprobe.tc | 53 +++++++++++++++++++ > 1 file changed, 53 insertions(+) > create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/add_remove_eprobe.tc > > diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_eprobe.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_eprobe.tc > new file mode 100644 > index 000000000000..7b242f29b916 > --- /dev/null > +++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_eprobe.tc > @@ -0,0 +1,53 @@ > +#!/bin/sh > +# SPDX-License-Identifier: GPL-2.0 > +# description: Generic dynamic event - add/remove eprobe events > +# requires: dynamic_events "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/$END/trigger Hmm, can you make this more simple one without synthetic events? Since synthetic event depends on CONFIG_SYNTH_EVENTS, you need to add "synth_events" to 'requires' tag. However, this means that this testcase doesn't run when CONFIG_SYNTH_EVENTS=n but CONFIG_*PROBE_EVENTS=y. Thank you, > + > +echo "e:$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/$EPROBE > + > +clear_trace > -- > 2.30.2
On Fri, 20 Aug 2021 09:46:39 +0900 Masami Hiramatsu <mhiramat@kernel.org> wrote: > > + > > +echo "$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 > > Hmm, can you make this more simple one without synthetic events? > Since synthetic event depends on CONFIG_SYNTH_EVENTS, you need to add > "synth_events" to 'requires' tag. > However, this means that this testcase doesn't run when CONFIG_SYNTH_EVENTS=n > but CONFIG_*PROBE_EVENTS=y. Sure. I just used this because it was one of the main purposes I was using it for. I may keep this as a test, but will rename it as something else, and make a more simple one for just testing the event probe add and removal. -- Steve
diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_eprobe.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_eprobe.tc new file mode 100644 index 000000000000..7b242f29b916 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_eprobe.tc @@ -0,0 +1,53 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Generic dynamic event - add/remove eprobe events +# requires: dynamic_events "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