linux-kernel - Re: [RFC PATCH] perf/stat: Add --disable-hwdt

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Date:   Sat, 11 Feb 2017 18:03:30 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Robert Richter <rric@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Vince Weaver <vince@...ter.net>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] perf/stat: Add --disable-hwdt

Ok,

turns out perf-list(1) already talks about it in the "EVENT GROUPS"
section. How about this then:

---
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index a02f2e965628..2d18283574db 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -146,6 +146,7 @@ static aggr_get_id_t		aggr_get_id;
 static bool			append_file;
 static const char		*output_name;
 static int			output_fd;
+static int			print_free_counters_hint;
 
 struct perf_stat {
 	bool			 record;
@@ -1109,6 +1110,9 @@ static void printout(int id, int nr, struct perf_evsel *counter, double uval,
 			counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
 			csv_sep);
 
+		if (counter->supported)
+			print_free_counters_hint = 1;
+
 		fprintf(stat_config.output, "%-*s%s",
 			csv_output ? 0 : unit_width,
 			counter->unit, csv_sep);
@@ -1476,7 +1480,13 @@ static void print_footer(void)
 		print_noise_pct(stddev_stats(&walltime_nsecs_stats),
 				avg_stats(&walltime_nsecs_stats));
 	}
+
 	fprintf(output, "\n\n");
+
+	if (print_free_counters_hint)
+		fprintf(output,
+"Some events couldn't be scheduled. Consider freeing some counters by disabling the NMI watchdog temporarily, \n"
+"for example. See perf-list(1) manpage.\n");
 }
 
 static void print_counters(struct timespec *ts, int argc, const char **argv)

-- 
Regards/Gruss,
    Boris.

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