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authorArnaldo Carvalho de Melo <acme@redhat.com>2017-07-10 16:19:25 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-07-10 16:19:25 -0300
commitede5626d303b721dd02246a3850380943c24e380 (patch)
tree675a1d0c32fc5c5abba4bf423aa43b3092450a77 /tools/perf
parentd37a369790774af66a4aee61a188384d21b17a43 (diff)
downloadop-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.c6
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;
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