perf diff: Color the Delta column

Color the numbers in the Delta column using percent_color_snprintf().

Generalize the coloring function so that we can accommodate all three
comparison methods in future patches: delta, ratio, and wdiff.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1388388861-7931-3-git-send-email-artagnon@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 48 insertions, 1 deletions

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 987cac3b4bba..6c3f220115ac 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -770,6 +770,45 @@ static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
         return ret;
 }
 
+static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
+                                struct perf_hpp *hpp, struct hist_entry *he,
+                                int comparison_method)
+{
+        struct diff_hpp_fmt *dfmt =
+                container_of(fmt, struct diff_hpp_fmt, fmt);
+        struct hist_entry *pair = get_pair_fmt(he, dfmt);
+        double diff;
+        char pfmt[20] = " ";
+
+        if (!pair)
+                goto dummy_print;
+
+        switch (comparison_method) {
+        case COMPUTE_DELTA:
+                if (pair->diff.computed)
+                        diff = pair->diff.period_ratio_delta;
+                else
+                        diff = compute_delta(he, pair);
+
+                if (fabs(diff) < 0.01)
+                        goto dummy_print;
+                scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
+                return percent_color_snprintf(hpp->buf, hpp->size,
+                                        pfmt, diff);
+        default:
+                BUG_ON(1);
+        }
+dummy_print:
+        return scnprintf(hpp->buf, hpp->size, "%*s",
+                        dfmt->header_width, pfmt);
+}
+
+static int hpp__color_delta(struct perf_hpp_fmt *fmt,
+                        struct perf_hpp *hpp, struct hist_entry *he)
+{
+        return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
+}
+
 static void
 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 {
@@ -941,8 +980,16 @@ static void data__hpp_register(struct data__file *d, int idx)
         fmt->entry  = hpp__entry_global;
 
         /* TODO more colors */
-        if (idx == PERF_HPP_DIFF__BASELINE)
+        switch (idx) {
+        case PERF_HPP_DIFF__BASELINE:
                 fmt->color = hpp__color_baseline;
+                break;
+        case PERF_HPP_DIFF__DELTA:
+                fmt->color = hpp__color_delta;
+                break;
+        default:
+                break;
+        }
 
         init_header(d, dfmt);
         perf_hpp__column_register(fmt);