Messages in this thread Patch in this message | | | From | Arnaldo Carvalho de Melo <> | Subject | [PATCH 04/12] perf stat: Keep the / modifier separator in fallback | Date | Wed, 25 Apr 2018 13:00:00 -0300 |
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From: Jiri Olsa <jolsa@kernel.org>
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> --- tools/perf/util/evsel.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
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) -- 2.14.3
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