diff options
| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-03-01 14:25:56 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-03-05 09:58:44 -0300 |
| commit | 7831bf236505bcb2a0a1255e7f3e902a0cb732d6 (patch) | |
| tree | 6c8a789c6b8de260f9e65b8a310714d834206d85 /tools/perf/Documentation/perf-top.txt | |
| parent | perf top browser: Show sample_freq in browser title line (diff) | |
| download | wireguard-linux-7831bf236505bcb2a0a1255e7f3e902a0cb732d6.tar.xz wireguard-linux-7831bf236505bcb2a0a1255e7f3e902a0cb732d6.zip | |
perf top: Allow asking for the maximum allowed sample rate
Add the handy '-F max' shortcut, just introduced to 'perf record', to
reading and using the kernel.perf_event_max_sample_rate value as the
user supplied sampling frequency:
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: https://lkml.kernel.org/n/tip-hz04f296zccknnb5at06a6q0@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf-top.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-top.txt | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt index 8a32cc77bead..a039407d63b8 100644 --- a/tools/perf/Documentation/perf-top.txt +++ b/tools/perf/Documentation/perf-top.txt @@ -55,7 +55,9 @@ Default is to monitor all CPUS. -F <freq>:: --freq=<freq>:: - Profile at this frequency. + Profile at this frequency. Use 'max' to use the currently maximum + allowed frequency, i.e. the value in the kernel.perf_event_max_sample_rate + sysctl. -i:: --inherit:: |