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perf tools: Fix pmu events parsing rule 

[ Upstream commit ceac7b79df ]

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>
pull/10/head
Jiri Olsa 2018-06-05 14:14:16 +02:00 committed by Greg Kroah-Hartman
parent 6a929b97b7
commit a47ece2b17
1 changed files with 13 additions and 1 deletions
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14
tools/perf/util/parse-events.y
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@ -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;