On Fri, Jul 28, 2023 at 11:54:11AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Jul 25, 2023 at 11:46:49AM +0530, Aditya Gupta escreveu:
> > Currently we depend on output of 'perf record -e "sched:sched_switch"', to
> > check whether perf was built with libtraceevent support.
> >
> > Instead, a more straightforward approach can be to check the build options,
> > using 'perf version --build-options', to check for libtraceevent support.
> >
> > [...]
> >
> > diff --git a/tools/perf/tests/shell/test_task_analyzer.sh
> > b/tools/perf/tests/shell/test_task_analyzer.sh
> > index 0095abbe20ca..a28d784987b4 100755
> > --- a/tools/perf/tests/shell/test_task_analyzer.sh
> > +++ b/tools/perf/tests/shell/test_task_analyzer.sh
> > @@ -52,7 +52,7 @@ find_str_or_fail() {
> >
> > # check if perf is compiled with libtraceevent support
> > skip_no_probe_record_support() {
> > - perf record -e "sched:sched_switch" -a -- sleep 1 2>&1 | grep
> > "libtraceevent is necessary for tracepoint support" && return 2
> > + perf version --build-options | grep HAVE_LIBTRACEEVENT | grep -q OFF &&
> > return 2
> > return 0
>
> I'll apply this, but please consider adding a:
>
> perf build --has libtraceevent
>
> subcommand to have that query made more compact and to avoid the two
> extra grep.
Okay. As you suggested in another reply, I found the code in builtin-version.c,
we can have a "perf build --has" option which can use the `IS_BUILTIN` macro
also used by "perf version --build-options". It can support all other feature
flags too.
You can implement it or I can work on a patch for that ?
It should require adding another 'struct option' to 'version_options', and
check for the flag in 'cmd_version()'. Will have to look how to get the string
passed after '--has'.
>
> BTW, I'll change that to:
>
> [acme@quaco perf-tools-next]$ perf version --build-options | grep " on .*
> HAVE_LIBTRACEEVENT"
> libtraceevent: [ on ] # HAVE_LIBTRACEEVENT
> [acme@quaco perf-tools-next]$
>
> replacing "on" with OFF, so that we have just one grep.
Okay.
Thanks,
- Aditya G
