[PATCH] perf hist: Fix perf diff baseline output

[Namhyung Kim]

When perf diff is running, the overhead field should print old hist
entry's period as a baseline.

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/ui/hist.c |   23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
index 16dc486d02be..326f4e9e6911 100644
--- a/tools/perf/ui/hist.c
+++ b/tools/perf/ui/hist.c
@@ -21,6 +21,18 @@ static int hpp__width_overhead(struct perf_hpp *hpp __used)
 static int hpp__color_overhead(struct perf_hpp *hpp, struct hist_entry *he)
 {
 	double percent = 100.0 * he->period / hpp->total_period;
+
+	if (hpp->ptr) {
+		struct hists *old_hists = hpp->ptr;
+		u64 total_period = old_hists->stats.total_period;
+		u64 base_period = he->pair ? he->pair->period : 0;
+
+		if (total_period)
+			percent = 100.0 * base_period / total_period;
+		else
+			percent = 0.0;
+	}
+
 	return percent_color_snprintf(hpp->buf, hpp->size, "  %5.2f%%", percent);
 }
 
@@ -29,6 +41,17 @@ static int hpp__entry_overhead(struct perf_hpp *hpp, struct hist_entry *he)
 	double percent = 100.0 * he->period / hpp->total_period;
 	const char *fmt = symbol_conf.field_sep ? "%.2f" : "  %5.2f%%";
 
+	if (hpp->ptr) {
+		struct hists *old_hists = hpp->ptr;
+		u64 total_period = old_hists->stats.total_period;
+		u64 base_period = he->pair ? he->pair->period : 0;
+
+		if (total_period)
+			percent = 100.0 * base_period / total_period;
+		else
+			percent = 0.0;
+	}
+
 	return scnprintf(hpp->buf, hpp->size, fmt, percent);
 }
 
-- 
1.7.9.2

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