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perf tools: Fix pmu events parsing rule
authorJiri Olsa <jolsa@kernel.org>
Tue, 5 Jun 2018 12:14:16 +0000 (14:14 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 3 Aug 2018 05:50:23 +0000 (07:50 +0200)
[ Upstream commit ceac7b79df7bd67ef9aaf464b0179a2686aff4ee ]

Currently all the event parsing fails end up
in the event_pmu rule, and display misleading
help like:

  $ perf stat -e inst kill
  event syntax error: 'inst'
                       \___ Cannot find PMU `inst'. Missing kernel support?
  ...

The reason is that the event_pmu is too strong
and match also single string. Changing it to
force the '/' separators to be part of the rule,
and getting the proper error now:

  $ perf stat -e inst kill
  event syntax error: 'inst'
                       \___ parser error
  Run 'perf list' for a list of valid events
  ...

Suggested-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180605121416.31645-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
tools/perf/util/parse-events.y patch | blob | history

diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index e81a20e..988310c 100644 (file)
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -72,6 +72,7 @@ static void inc_group_count(struct list_head *list,
 %type <num> value_sym
 %type <head> event_config
 %type <head> opt_event_config
+%type <head> opt_pmu_config
 %type <term> event_term
 %type <head> event_pmu
 %type <head> event_legacy_symbol
@@ -223,7 +224,7 @@ event_def: event_pmu |
           event_bpf_file
 
 event_pmu:
-PE_NAME opt_event_config
+PE_NAME opt_pmu_config
 {
        struct list_head *list, *orig_terms, *terms;
 
@@ -486,6 +487,17 @@ opt_event_config:
        $$ = NULL;
 }
 
+opt_pmu_config:
+'/' event_config '/'
+{
+       $$ = $2;
+}
+|
+'/' '/'
+{
+       $$ = NULL;
+}
+
 start_terms: event_config
 {
        struct parse_events_state *parse_state = _parse_state;
Domain: System / Kernel;