Em Wed, Jul 04, 2018 at 05:25:36PM +0200, Jiri Olsa escreveu:
> On Wed, Jul 04, 2018 at 02:13:45PM +0200, Jack Henschel wrote:
> > This is the second version of a patch that improves the error
> > message of the perf events parser when the PMU hardware does not support
> > address filters.
> >
> > Previously, the perf returned the following error:
> > > $ perf record -e intel_pt// --filter 'filter sys_write'
> > > --filter option should follow a -e tracepoint or HW tracer option
> > This implies there is some syntax error present in the command line,
> > which is not true. Rather, notify the user that the CPU does not have
> > support for this feature.
> >
> > For example, Intel chips based on the Broadwell micro-archticture have
> > the Intel PT PMU, but do not support address filtering.
> >
> > Now, perf prints the following error message:
> > > $ perf record -e intel_pt// --filter 'filter sys_write'
> > > This CPU does not support address filtering
> >
> > Signed-off-by: Jack Henschel <jack...@mailbox.org>
>
> Acked-by: Jiri Olsa <jo...@kernel.org>
Thanks, tested and applied,
- Arnaldo
> thanks,
> jirka
>
> > ---
> > tools/perf/util/parse-events.c | 20 ++++++++++----------
> > 1 file changed, 10 insertions(+), 10 deletions(-)
> >
> > diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> > index 15eec49e71a1..f8cd3e7c9186 100644
> > --- a/tools/perf/util/parse-events.c
> > +++ b/tools/perf/util/parse-events.c
> > @@ -1991,8 +1991,11 @@ static int set_filter(struct perf_evsel *evsel,
> > const void *arg)
> > int nr_addr_filters = 0;
> > struct perf_pmu *pmu = NULL;
> >
> > - if (evsel == NULL)
> > - goto err;
> > + if (evsel == NULL) {
> > + fprintf(stderr,
> > + "--filter option should follow a -e tracepoint or HW
> > tracer option\n");
> > + return -1;
> > + }
> >
> > if (evsel->attr.type == PERF_TYPE_TRACEPOINT) {
> > if (perf_evsel__append_tp_filter(evsel, str) < 0) {
> > @@ -2014,8 +2017,11 @@ static int set_filter(struct perf_evsel *evsel,
> > const void *arg)
> > perf_pmu__scan_file(pmu, "nr_addr_filters",
> > "%d", &nr_addr_filters);
> >
> > - if (!nr_addr_filters)
> > - goto err;
> > + if (!nr_addr_filters) {
> > + fprintf(stderr,
> > + "This CPU does not support address filtering\n");
> > + return -1;
> > + }
> >
> > if (perf_evsel__append_addr_filter(evsel, str) < 0) {
> > fprintf(stderr,
> > @@ -2024,12 +2030,6 @@ static int set_filter(struct perf_evsel *evsel,
> > const void *arg)
> > }
> >
> > return 0;
> > -
> > -err:
> > - fprintf(stderr,
> > - "--filter option should follow a -e tracepoint or HW tracer
> > option\n");
> > -
> > - return -1;
> > }
> >
> > int parse_filter(const struct option *opt, const char *str,
> > --
> > 2.18.0
> >
