Revert "perf tools: Emit clearer message for sys_perf_event_open ENOENT return"

This reverts commit aa7bc7ef73efc46d7c3a0e185eefaf85744aec98.

It removed the fallback from hardware profiling to software profiling.
.e.g., in a VM with no PMU.

Reported-by: David Ahern <daahern@cisco.com>
Cc: David Ahern <daahern@cisco.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index aa7ece3..1210e64 100644 (file)
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -331,9 +331,6 @@ try_again:
                        else if (err ==  ENODEV && cpu_list) {
                                die("No such device - did you specify"
                                        " an out-of-range profile CPU?\n");
-                       } else if (err == ENOENT) {
-                               die("%s event is not supported. ",
-                                    event_name(evsel));
                        } else if (err == EINVAL && sample_id_all_avail) {
                                /*
                                 * Old kernel, no attr->sample_id_type_all field

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 568b195..05344c6 100644 (file)
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1247,8 +1247,6 @@ try_again:
                                die("Permission error - are you root?\n"
                                        "\t Consider tweaking"
                                        " /proc/sys/kernel/perf_event_paranoid.\n");
-                       if (err == ENOENT)
-                               die("%s event is not supported. ", event_name(evsel));
                        /*
                         * If it's cycles then fall back to hrtimer
                         * based cpu-clock-tick sw counter, which