perf test: Silence tracepoint event failures

Currently, when 'perf test' is run by a normal user, it'll fail to
access tracepoint events.  The output becomes somewhat messy because it
tries to be nice with long error messages and hints.

IMHO this is not needed for 'perf test' by default and AFAIK 'perf test'
uses pr_debug() rather than pr_err() for such messages so that one can
use -v option to see further details on failed testcases if needed.

Before:
  $ perf test
   1: vmlinux symtab matches kallsyms                          : FAILED!
   2: detect openat syscall event                              :Error:
  No permissions to read
  /sys/kernel/debug/tracing/events/syscalls/sys_enter_openat
  Hint:	Try 'sudo mount -o remount,mode=755 /sys/kernel/debug/tracing'
  FAILED!
   3: detect openat syscall event on all cpus                  :Error:
  No permissions to read
  /sys/kernel/debug/tracing/events/syscalls/sys_enter_openat
  Hint:	Try 'sudo mount -o remount,mode=755 /sys/kernel/debug/tracing'
  FAILED!
   ...

After:
  $ perf test
   1: vmlinux symtab matches kallsyms                          : FAILED!
   2: detect openat syscall event                              : FAILED!
   3: detect openat syscall event on all cpus                  : FAILED!
   ...

  $ perf test -v 2
   2: detect openat syscall event                              :
  --- start ---
  test child forked, pid 30575
  Error:	    No permissions to read
  /sys/kernel/debug/tracing/events/syscalls/sys_enter_openat
  Hint:  Try 'sudo mount -o remount,mode=755 /sys/kernel/debug/tracing'

  test child finished with -1
  ---- end ----
  detect openat syscall event: FAILED!

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1445268229-1601-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/tests/openat-syscall-all-cpus.c b/tools/perf/tests/openat-syscall-all-cpus.c
index 9e104a2e973d76526a753bdca7e31496c41a00cd..2006485a2859ba450ddbe6da6c005ff58b5b47d8 100644 (file)
--- a/tools/perf/tests/openat-syscall-all-cpus.c
+++ b/tools/perf/tests/openat-syscall-all-cpus.c
@@ -34,7 +34,7 @@ int test__openat_syscall_event_on_all_cpus(void)
        evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
        if (IS_ERR(evsel)) {
                tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
-               pr_err("%s\n", errbuf);
+               pr_debug("%s\n", errbuf);
                goto out_thread_map_delete;
        }
 

diff --git a/tools/perf/tests/openat-syscall-tp-fields.c b/tools/perf/tests/openat-syscall-tp-fields.c
index 473d3869727ef1afdacb2ad8387ec57cc5192245..5e811cd8f1c3e14567ef38e9da9595f502946c5d 100644 (file)
--- a/tools/perf/tests/openat-syscall-tp-fields.c
+++ b/tools/perf/tests/openat-syscall-tp-fields.c
@@ -89,7 +89,7 @@ int test__syscall_openat_tp_fields(void)
 
                                err = perf_evsel__parse_sample(evsel, event, &sample);
                                if (err) {
-                                       pr_err("Can't parse sample, err = %d\n", err);
+                                       pr_debug("Can't parse sample, err = %d\n", err);
                                        goto out_delete_evlist;
                                }
 

diff --git a/tools/perf/tests/openat-syscall.c b/tools/perf/tests/openat-syscall.c
index 7b1db8306098b40b97aa9053960ba0b160509318..033b54797b8a021fe5f5c7ed25459a23d9cb5b6c 100644 (file)
--- a/tools/perf/tests/openat-syscall.c
+++ b/tools/perf/tests/openat-syscall.c
@@ -22,7 +22,7 @@ int test__openat_syscall_event(void)
        evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
        if (IS_ERR(evsel)) {
                tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
-               pr_err("%s\n", errbuf);
+               pr_debug("%s\n", errbuf);
                goto out_thread_map_delete;
        }