* [PATCH] perf tools: Fix cache event name generation
2012-09-05 15:21 duplicate cache misses counter labels with perf-stat Joel Uckelman
@ 2012-09-05 17:51 ` Jiri Olsa
0 siblings, 0 replies; 2+ messages in thread
From: Jiri Olsa @ 2012-09-05 17:51 UTC (permalink / raw)
To: Joel Uckelman
Cc: linux-perf-users, Arnaldo Carvalho de Melo, Peter Zijlstra,
Ingo Molnar, Paul Mackerras, Corey Ashford, Frederic Weisbecker
On Wed, Sep 05, 2012 at 05:21:10PM +0200, Joel Uckelman wrote:
> When I do this with perf 3.5.2,
>
> perf stat -x, -e
> L1-dcache-loads,L1-dcache-load-misses,L1-dcache-stores,L1-dcache-store-misses
> ls
>
> I'm seeing this output from perf:
>
> 697171,L1-dcache-loads
>
> 28012,L1-dcache-misses
>
> 455691,L1-dcache-stores
>
> 11791,L1-dcache-misses
>
> So, I'm getting two results labeled "L1-dcache-misses" (with different
> values!) and none labeled "L1-dcache-store-misses". It looks to me
> like one of the "L1-dcache-misses" is mislabeled.
>
> There appears to be a general problem with all of the *-misses
> counters, as a similar thing happens with, e.g., LLC-load-misses and
> LLC-store-missses, and all of the others I've checked.
>
> Is this a bug, or am I misunderstanding how perf-stat is supposed to work?
bug ;) please try attached patch
thanks,
jirka
---
If the event name is specified with all 3 components, the last one
overwrites the previous one during the name composing within the
parse_events_add_cache function.
Fixing this by properly adjusting the string index.
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
---
tools/perf/util/parse-events.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index b246303..a031ee1 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -308,7 +308,7 @@ int parse_events_add_cache(struct list_head **list, int *idx,
for (i = 0; (i < 2) && (op_result[i]); i++) {
char *str = op_result[i];
- snprintf(name + n, MAX_NAME_LEN - n, "-%s\n", str);
+ n += snprintf(name + n, MAX_NAME_LEN - n, "-%s", str);
if (cache_op == -1) {
cache_op = parse_aliases(str, perf_evsel__hw_cache_op,
--
1.7.11.4
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