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perf stat: Only print NMI watchdog hint when enabled

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Only print the NMI watchdog hint when that watchdog it actually enabled.

This avoids printing these unnecessarily.

Signed-off-by: Andi Kleen <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Andi Kleen 2017-05-22 18:00:16 -07:00 • committed by Arnaldo Carvalho de Melo
commit 918c7b062a
1 changed files with 4 additions and 1 deletions
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5
tools/perf/builtin-stat.c
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@ -1578,6 +1578,7 @@ static void print_header(int argc, const char **argv)
static void print_footer(void)
{
FILE *output = stat_config.output;
int n;
if (!null_run)
fprintf(output, "\n");
@ -1590,7 +1591,9 @@ static void print_footer(void)
}
fprintf(output, "\n\n");
if (print_free_counters_hint)
if (print_free_counters_hint &&
sysctl__read_int("kernel/nmi_watchdog", &n) >= 0 &&
n > 0)
fprintf(output,
"Some events weren't counted. Try disabling the NMI watchdog:\n"
" echo 0 > /proc/sys/kernel/nmi_watchdog\n"