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authorJiri Olsa <jolsa@kernel.org>2018-04-23 11:08:17 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-04-23 11:14:10 -0300
commit129193bb0c43d42f1c397c175346e3e0dba5a578 (patch)
tree40bd599fb1569f1ea911d065346d8239e1ed081a /tools
parentb31a8cc1a53dda3a33b6c9c62779869d4d5fc142 (diff)
downloadlinux-129193bb0c43d42f1c397c175346e3e0dba5a578.tar.bz2
perf stat: Keep the / modifier separator in fallback
The 'perf stat' fallback for EACCES error sets the exclude_kernel perf_event_attr and tries perf_event_open() again with it. In addition, it also changes the name of the event to reflect that change by adding the 'u' modifier. But it does not take into account the '/' separator, so the event name can end up mangled, like: (note the '/:' characters) $ perf stat -e cpu/cpu-cycles/ kill ... 386,832 cpu/cpu-cycles/:u Adding the code to check on the '/' separator and set the following correct event name: $ perf stat -e cpu/cpu-cycles/ kill ... 388,548 cpu/cpu-cycles/u Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.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/20180423090823.32309-4-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/evsel.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 3e87486c28fe..7eb1e9850abf 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2754,8 +2754,14 @@ bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
(paranoid = perf_event_paranoid()) > 1) {
const char *name = perf_evsel__name(evsel);
char *new_name;
+ const char *sep = ":";
- if (asprintf(&new_name, "%s%su", name, strchr(name, ':') ? "" : ":") < 0)
+ /* Is there already the separator in the name. */
+ if (strchr(name, '/') ||
+ strchr(name, ':'))
+ sep = "";
+
+ if (asprintf(&new_name, "%s%su", name, sep) < 0)
return false;
if (evsel->name)