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, 17 insertions, 6 deletions

diff --git a/Documentation/perf_counter/builtin-top.c b/Documentation/perf_counter/builtin-top.c
index 548a8da4b15b..20e5b1200959 100644
--- a/Documentation/perf_counter/builtin-top.c
+++ b/Documentation/perf_counter/builtin-top.c
@@ -21,6 +21,7 @@
 #include "perf.h"
 
 #include "util/symbol.h"
+#include "util/color.h"
 #include "util/util.h"
 #include "util/rbtree.h"
 #include "util/parse-options.h"
@@ -253,7 +254,8 @@ static void print_sym_table(void)
         for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
                 struct sym_entry *syme = rb_entry(nd, struct sym_entry, rb_node);
                 struct symbol *sym = (struct symbol *)(syme + 1);
-                float pcnt;
+                char *color = PERF_COLOR_NORMAL;
+                double pcnt;
 
                 if (++printed > print_entries || syme->snap_count < count_filter)
                         continue;
@@ -261,13 +263,22 @@ static void print_sym_table(void)
                 pcnt = 100.0 - (100.0 * ((sum_kevents - syme->snap_count) /
                                          sum_kevents));
 
+                /*
+                 * We color high-overhead entries in red, low-overhead
+                 * entries in green - and keep the middle ground normal:
+                 */
+                if (pcnt >= 5.0)
+                        color = PERF_COLOR_RED;
+                if (pcnt < 0.5)
+                        color = PERF_COLOR_GREEN;
+
                 if (nr_counters == 1)
-                        printf("%19.2f - %4.1f%% - %016llx : %s\n",
-                                syme->weight, pcnt, sym->start, sym->name);
+                        printf("%19.2f - ", syme->weight);
                 else
-                        printf("%8.1f %10ld - %4.1f%% - %016llx : %s\n",
-                                syme->weight, syme->snap_count,
-                                pcnt, sym->start, sym->name);
+                        printf("%8.1f %10ld - ", syme->weight, syme->snap_count);
+
+                color_fprintf(stdout, color, "%4.1f%%", pcnt);
+                printf(" - %016llx : %s\n", sym->start, sym->name);
         }
 
         {