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Commit 7831bf23 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent a9980a6d

tools/perf/Documentation/perf-top.txt

+3 −1
Original line number Diff line number Diff line
@@ -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::

tools/perf/builtin-top.c

+3 −1
Original line number Diff line number Diff line
@@ -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,