Messages in this thread | | | Date | Mon, 3 Jul 2017 12:38:51 +0900 | From | Masami Hiramatsu <> | Subject | Re: [PATCH v2 4/4] selftests/ftrace: Add a testcase for kprobe event naming |
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On Thu, 29 Jun 2017 19:05:39 +0530 "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> wrote:
> From: Masami Hiramatsu <mhiramat@kernel.org> > > Add a testcase for kprobe event naming. This testcase > checks whether the kprobe events can automatically ganerate > its event name on normal function and dot-suffixed function. > Also it checks whether the kprobe events can correctly > define new event with given event name and group name. > > Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> > [Updated tests to use vfs_read and symbols with '.isra.', > added check for kprobe_events and a command to clear it on exit] > Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> > --- > .../ftrace/test.d/kprobe/kprobe_eventname.tc | 32 ++++++++++++++++++++++ > 1 file changed, 32 insertions(+) > create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_eventname.tc > > diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_eventname.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_eventname.tc > new file mode 100644 > index 000000000000..182e5a78ef4b > --- /dev/null > +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_eventname.tc > @@ -0,0 +1,32 @@ > +#!/bin/sh > +# description: Kprobe event auto/manual naming > + > +[ -f kprobe_events ] || exit_unsupported # this is configurable > + > +disable_events > +echo > kprobe_events > + > +:;: "Add an event on function without name" ;: > + > +FUNC=`grep " [tT] .*vfs_read$" /proc/kallsyms | tail -n 1 | cut -f 3 -d " "` > +echo p $FUNC > kprobe_events > +FUNC_NAME=`echo $FUNC | tr ".:" "_"` > +test -d events/kprobes/p_${FUNC_NAME}_0 || exit_failure > + > +:;: "Add an event on function with new name" ;: > + > +echo p:event1 $FUNC > kprobe_events > +test -d events/kprobes/event1 || exit_failure > + > +:;: "Add an event on function with new name and group" ;: > + > +echo p:kprobes2/event2 $FUNC > kprobe_events > +test -d events/kprobes2/event2 || exit_failure > + > +:;: "Add an event on dot function without name" ;: > + > +FUNC=`grep -m 10 " [tT] .*\.isra\..*$" /proc/kallsyms | tail -n 1 | cut -f 3 -d " "`
Since in some case we may not be able to find the function(e.g. build with old gcc or not optimized), we should check this is exist. I suggested to return UNRESOLVED for that case instead of FAIL, as below.
FUNC=`grep -m 10 " [tT] .*\.isra\..*$" /proc/kallsyms | tail -n 1 | cut -f 3 -d " "` || exit_unresolved
Thank you,
> +echo p $FUNC > kprobe_events > +EVENT=`grep $FUNC kprobe_events | cut -f 1 -d " " | cut -f 2 -d:` || exit_failure > +test -d events/$EVENT || exit_failure > +echo > kprobe_events > -- > 2.13.1 >
-- Masami Hiramatsu <mhiramat@kernel.org>
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