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

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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>
This commit is contained in:
Ingo Molnar 2011-04-27 04:06:33 +02:00
parent b908debd4e
commit ceb53fbf6d
1 changed files with 22 additions and 11 deletions
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33
tools/perf/util/parse-events.c
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@ -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;
}