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author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-05-12 16:25:18 -0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-05-12 16:25:18 -0300 |
commit | 42ef8a78c1f49f53f29f0f3a6f9a5bcbc653233e (patch) | |
tree | 94e3776eeff15c96c30f32a09d63ad3bcb9fdc84 /fs | |
parent | 08094828b711dd32de57e9e3314935e19db71b3d (diff) | |
download | linux-42ef8a78c1f49f53f29f0f3a6f9a5bcbc653233e.tar.bz2 |
perf stat: Fallback to user only counters when perf_event_paranoid > 1
After 0161028b7c8a ("perf/core: Change the default paranoia level to 2")
'perf stat' fails for users without CAP_SYS_ADMIN, so just use
'perf_evsel__fallback()' to have the same behaviour as 'perf record',
i.e. set perf_event_attr.exclude_kernel to 1.
Now:
[acme@jouet linux]$ perf stat usleep 1
Performance counter stats for 'usleep 1':
0.352536 task-clock:u (msec) # 0.423 CPUs utilized
0 context-switches:u # 0.000 K/sec
0 cpu-migrations:u # 0.000 K/sec
49 page-faults:u # 0.139 M/sec
309,407 cycles:u # 0.878 GHz
243,791 instructions:u # 0.79 insn per cycle
49,622 branches:u # 140.757 M/sec
3,884 branch-misses:u # 7.83% of all branches
0.000834174 seconds time elapsed
[acme@jouet linux]$
Reported-by: Ingo Molnar <mingo@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-b20jmx4dxt5hpaa9t2rroi0o@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'fs')
0 files changed, 0 insertions, 0 deletions