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perf stat: Suppress printing std-dev when its 0 

For pretty output only (preserve column for cvs output), dont print
std-deviation when its 0.00.  Do this based upon value, instead of
checking for --no-aggr, since the stats could conceivably be computed
over the runs on each CPU, and theres no reason to preclude that.

Link: http://lkml.kernel.org/r/1315437244-3788-4-git-send-email-jim.cromie@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jim Cromie 2011-09-07 17:14:02 -06:00 committed by Arnaldo Carvalho de Melo
parent 19f4740255
commit a1bca6cc87
1 changed files with 1 additions and 1 deletions
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2
tools/perf/builtin-stat.c
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@ -528,7 +528,7 @@ static void print_noise_pct(double total, double avg)
if (csv_output)
fprintf(output, "%s%.2f%%", csv_sep, pct);
else
else if (pct)
fprintf(output, " ( +-%6.2f%% )", pct);
}