perf stat: Fail more clearly when an invalid modifier is specified

Currently we fail without printing any error message on "perf stat -e task-clock-msecs".

The reason is that the task-clock event is matched and the "-msecs" postfix is assumed
to be an event modifier - but is not recognized.

This patch changes the code to be more informative:

 $ perf stat -e task-clock-msecs true
 invalid event modifier: '-msecs'
 Run 'perf list' for a list of valid events and modifiers

And restructures the return value of parse_event_modifier() to allow
the printing of all variants of invalid event modifiers.

Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/n/tip-wlaw3dvz1ly6wple8l52cfca@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 22 insertions, 11 deletions

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 8e54bdb553c3..b686269427ea 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -721,15 +721,19 @@ parse_numeric_event(const char **strp, struct perf_event_attr *attr)
         return EVT_FAILED;
 }
 
-static enum event_result
+static int
 parse_event_modifier(const char **strp, struct perf_event_attr *attr)
 {
         const char *str = *strp;
         int exclude = 0;
         int eu = 0, ek = 0, eh = 0, precise = 0;
 
-        if (*str++ != ':')
+        if (!*str)
                 return 0;
+
+        if (*str++ != ':')
+                return -1;
+
         while (*str) {
                 if (*str == 'u') {
                         if (!exclude)
@@ -750,14 +754,16 @@ parse_event_modifier(const char **strp, struct perf_event_attr *attr)
 
                 ++str;
         }
-        if (str >= *strp + 2) {
-                *strp = str;
-                attr->exclude_user   = eu;
-                attr->exclude_kernel = ek;
-                attr->exclude_hv     = eh;
-                attr->precise_ip     = precise;
-                return 1;
-        }
+        if (str < *strp + 2)
+                return -1;
+
+        *strp = str;
+
+        attr->exclude_user   = eu;
+        attr->exclude_kernel = ek;
+        attr->exclude_hv     = eh;
+        attr->precise_ip     = precise;
+
         return 0;
 }
 
@@ -800,7 +806,12 @@ parse_event_symbols(const struct option *opt, const char **str,
         return EVT_FAILED;
 
 modifier:
-        parse_event_modifier(str, attr);
+        if (parse_event_modifier(str, attr) < 0) {
+                fprintf(stderr, "invalid event modifier: '%s'\n", *str);
+                fprintf(stderr, "Run 'perf list' for a list of valid events and modifiers\n");
+
+                return EVT_FAILED;
+        }
 
         return ret;
 }