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perf stat: Flush output after each line in interval mode 

When interval mode is outputting to a pipe, each measurement should be
flushed individually, so that the reader sees it timely.

With a terminal each line is automatically flushed by stdio, but that is
disabled with non terminal output.

Simply fflush output after each time interval

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1375490473-1503-5-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Andi Kleen 2013-08-02 17:41:12 -07:00 committed by Arnaldo Carvalho de Melo
parent 411916880f
commit 2bbf03f16a
1 changed files with 2 additions and 0 deletions
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2
tools/perf/builtin-stat.c
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@ -416,6 +416,8 @@ static void print_interval(void)
list_for_each_entry(counter, &evsel_list->entries, node) list_for_each_entry(counter, &evsel_list->entries, node)
print_counter_aggr(counter, prefix); print_counter_aggr(counter, prefix);
} }
fflush(output);
} }
static void handle_initial_delay(void) static void handle_initial_delay(void)