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authorArnaldo Carvalho de Melo <acme@redhat.com>2018-03-01 14:25:56 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-03-05 09:58:44 -0300
commit7831bf236505bcb2a0a1255e7f3e902a0cb732d6 (patch)
tree6c8a789c6b8de260f9e65b8a310714d834206d85 /tools/perf/builtin-top.c
parenta9980a6dbb9efd154b032ad729c869784302f361 (diff)
downloadlinux-7831bf236505bcb2a0a1255e7f3e902a0cb732d6.tar.bz2
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/builtin-top.c')
-rw-r--r--tools/perf/builtin-top.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 35ac016fcb98..bb4f9fafd11d 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1307,7 +1307,9 @@ int cmd_top(int argc, const char **argv)
OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
"symbol to annotate"),
OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
- OPT_UINTEGER('F', "freq", &opts->user_freq, "profile at this frequency"),
+ OPT_CALLBACK('F', "freq", &top.record_opts, "freq or 'max'",
+ "profile at this frequency",
+ record__parse_freq),
OPT_INTEGER('E', "entries", &top.print_entries,
"display this many functions"),
OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,