Em Tue, Jun 04, 2019 at 07:35:04AM +0200, Thomas Richter escreveu:
> Command
>
> # perf test -Fv 6
>
> fails with error
>
> running test 100 'kvm-s390:kvm_s390_create_vm' failed to parse
> event 'kvm-s390:kvm_s390_create_vm', err -1, str 'unknown tracepoint'
> event syntax error: 'kvm-s390:kvm_s390_create_vm'
> \___ unknown tracepoint
Thanks, applied,
- Arnaldo
> when the kvm module is not loaded or not built in.
>
> Fix this by adding a valid function which tests if the module
> is loaded. Loaded modules (or builtin KVM support) have a
> directory named
> /sys/kernel/debug/tracing/events/kvm-s390
> for this tracepoint.
>
> Check for existence of this directory.
>
> Signed-off-by: Thomas Richter <tmri...@linux.ibm.com>
> Reviewed-by: Christian Borntraeger <borntrae...@de.ibm.com>
> ---
> tools/perf/tests/parse-events.c | 27 +++++++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
>
> diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
> index 4a69c07f4101..8f3c80e13584 100644
> --- a/tools/perf/tests/parse-events.c
> +++ b/tools/perf/tests/parse-events.c
> @@ -18,6 +18,32 @@
> #define PERF_TP_SAMPLE_TYPE (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | \
> PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD)
>
> +#if defined(__s390x__)
> +/* Return true if kvm module is available and loaded. Test this
> + * and retun success when trace point kvm_s390_create_vm
> + * exists. Otherwise this test always fails.
> + */
> +static bool kvm_s390_create_vm_valid(void)
> +{
> + char *eventfile;
> + bool rc = false;
> +
> + eventfile = get_events_file("kvm-s390");
> +
> + if (eventfile) {
> + DIR *mydir = opendir(eventfile);
> +
> + if (mydir) {
> + rc = true;
> + closedir(mydir);
> + }
> + put_events_file(eventfile);
> + }
> +
> + return rc;
> +}
> +#endif
> +
> static int test__checkevent_tracepoint(struct perf_evlist *evlist)
> {
> struct perf_evsel *evsel = perf_evlist__first(evlist);
> @@ -1642,6 +1668,7 @@ static struct evlist_test test__events[] = {
> {
> .name = "kvm-s390:kvm_s390_create_vm",
> .check = test__checkevent_tracepoint,
> + .valid = kvm_s390_create_vm_valid,
> .id = 100,
> },
> #endif
> --
> 2.21.0
--
- Arnaldo
