perf record: Tweak "Lowering..." warning in record_opts__config_freq

That is, instead of "Lowering default frequency rate to <F>" say
"Lowering default frequency rate from <f> to <F>", specifying the
overridden default frequency <f>, so you don't have to grep through the
source to "remember" that was e.g. 4000.

Signed-off-by: Hans-Peter Nilsson <hp@axis.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20201228031908.B049B203B5@pchp3.se.axis.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/record.c

@@ -201,10 +201,10 @@ static int record_opts__config_freq(struct record_opts *opts)
 	 * Default frequency is over current maximum.
 	 */
 	if (max_rate < opts->freq) {
-		pr_warning("Lowering default frequency rate to %u.\n"
+		pr_warning("Lowering default frequency rate from %u to %u.\n"
 			   "Please consider tweaking "
 			   "/proc/sys/kernel/perf_event_max_sample_rate.\n",
-			   max_rate);
+			   opts->freq, max_rate);
 		opts->freq = max_rate;
 	}