perf_counter tools: Add color terminal output support

Add Git's color printing library to util/color.[ch].

Add it to perf report, with a trivial example to print high-overhead
entries in red, low-overhead entries in green.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 14 insertions, 1 deletions

diff --git a/Documentation/perf_counter/builtin-report.c b/Documentation/perf_counter/builtin-report.c
index e930b4e02335..7beedc6effa4 100644
--- a/Documentation/perf_counter/builtin-report.c
+++ b/Documentation/perf_counter/builtin-report.c
@@ -9,6 +9,7 @@
 
 #include "util/util.h"
 
+#include "util/color.h"
 #include "util/list.h"
 #include "util/cache.h"
 #include "util/rbtree.h"
@@ -548,7 +549,19 @@ hist_entry__fprintf(FILE *fp, struct hist_entry *self, uint64_t total_samples)
         size_t ret;
 
         if (total_samples) {
-                ret = fprintf(fp, "   %6.2f%%",
+                double percent = self->count * 100.0 / total_samples;
+                char *color = PERF_COLOR_NORMAL;
+
+                /*
+                 * We color high-overhead entries in red, low-overhead
+                 * entries in green - and keep the middle ground normal:
+                 */
+                if (percent >= 5.0)
+                        color = PERF_COLOR_RED;
+                if (percent < 0.5)
+                        color = PERF_COLOR_GREEN;
+
+                ret = color_fprintf(fp, color, "   %6.2f%%",
                                 (self->count * 100.0) / total_samples);
         } else
                 ret = fprintf(fp, "%12d ", self->count);