diff options
author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-07-10 16:19:25 -0300 |
---|---|---|
committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-07-10 16:19:25 -0300 |
commit | ede5626d303b721dd02246a3850380943c24e380 (patch) | |
tree | 675a1d0c32fc5c5abba4bf423aa43b3092450a77 /tools/perf | |
parent | d37a369790774af66a4aee61a188384d21b17a43 (diff) | |
download | op-kernel-dev-ede5626d303b721dd02246a3850380943c24e380.zip op-kernel-dev-ede5626d303b721dd02246a3850380943c24e380.tar.gz |
perf evsel: State in the default event name if attr.exclude_kernel is set
When no event is specified perf will use the "cycles" hardware event
with the highest precision available in the processor, and excluding
kernel events for non-root users, so make that clear in the event name
by setting the "u" event modifier, i.e. "cycles:upp".
E.g.:
The default for root:
# perf record usleep 1
# perf evlist -v
cycles:ppp: ..., precise_ip: 3, exclude_kernel: 0, ...
#
And for !root:
$ perf record usleep 1
$ perf evlist -v
cycles:uppp: ... , precise_ip: 3, exclude_kernel: 1, ...
$
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-lf29zcdl422i9knrgde0uwy3@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r-- | tools/perf/util/evsel.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index f2a1876..413f74d 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -298,8 +298,10 @@ struct perf_evsel *perf_evsel__new_cycles(void) goto out; /* use asprintf() because free(evsel) assumes name is allocated */ - if (asprintf(&evsel->name, "cycles%.*s", - attr.precise_ip ? attr.precise_ip + 1 : 0, ":ppp") < 0) + if (asprintf(&evsel->name, "cycles%s%s%.*s", + (attr.precise_ip || attr.exclude_kernel) ? ":" : "", + attr.exclude_kernel ? "u" : "", + attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0) goto error_free; out: return evsel; |