[PATCH 06/14] perf diff: Switching the base hists to be pairs head

[Jiri Olsa <jolsa@redhat.com>]

Making the baseline hists to act as a pairs head.

So far we don't care which hists act as a pairs head, because
we have only 2 files to deal with and any of them is suitable
to do the job.

But if we want to process more files, we need to pick up one
hists to act as pairs head, and the baseline hists is the most
suitable.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/builtin-diff.c | 60 +++++++++++++++++++++++------------------------
 tools/perf/ui/hist.c      | 25 ++++----------------
 2 files changed, 35 insertions(+), 50 deletions(-)

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index d488ee9..a3e3f7a 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -167,34 +167,34 @@ double perf_diff__period_percent(struct hist_entry *he, u64 period)
 
 double perf_diff__compute_delta(struct hist_entry *he, struct hist_entry *pair)
 {
-	double new_percent = perf_diff__period_percent(he, he->stat.period);
-	double old_percent = perf_diff__period_percent(pair, pair->stat.period);
+	double old_percent = perf_diff__period_percent(he, he->stat.period);
+	double new_percent = perf_diff__period_percent(pair, pair->stat.period);
 
-	he->diff.period_ratio_delta = new_percent - old_percent;
-	he->diff.computed = true;
-	return he->diff.period_ratio_delta;
+	pair->diff.period_ratio_delta = new_percent - old_percent;
+	pair->diff.computed = true;
+	return pair->diff.period_ratio_delta;
 }
 
 double perf_diff__compute_ratio(struct hist_entry *he, struct hist_entry *pair)
 {
-	double new_period = he->stat.period;
-	double old_period = pair->stat.period;
+	double old_period = he->stat.period ?: 1;
+	double new_period = pair->stat.period;
 
-	he->diff.computed = true;
-	he->diff.period_ratio = new_period / old_period;
-	return he->diff.period_ratio;
+	pair->diff.computed = true;
+	pair->diff.period_ratio = new_period / old_period;
+	return pair->diff.period_ratio;
 }
 
 s64 perf_diff__compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
 {
-	u64 new_period = he->stat.period;
-	u64 old_period = pair->stat.period;
+	u64 old_period = he->stat.period;
+	u64 new_period = pair->stat.period;
 
-	he->diff.computed = true;
-	he->diff.wdiff = new_period * compute_wdiff_w2 -
-			 old_period * compute_wdiff_w1;
+	pair->diff.computed = true;
+	pair->diff.wdiff = new_period * compute_wdiff_w2 -
+			   old_period * compute_wdiff_w1;
 
-	return he->diff.wdiff;
+	return pair->diff.wdiff;
 }
 
 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
@@ -203,15 +203,15 @@ static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
 	return scnprintf(buf, size,
 			 "(%" PRIu64 " * 100 / %" PRIu64 ") - "
 			 "(%" PRIu64 " * 100 / %" PRIu64 ")",
-			  he->stat.period, he->hists->stats.total_period,
-			  pair->stat.period, pair->hists->stats.total_period);
+			  pair->stat.period, pair->hists->stats.total_period,
+			  he->stat.period, he->hists->stats.total_period);
 }
 
 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
 			 char *buf, size_t size)
 {
-	double new_period = he->stat.period;
-	double old_period = pair->stat.period;
+	double old_period = he->stat.period;
+	double new_period = pair->stat.period;
 
 	return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
 }
@@ -219,8 +219,8 @@ static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
 			 char *buf, size_t size)
 {
-	u64 new_period = he->stat.period;
-	u64 old_period = pair->stat.period;
+	u64 old_period = he->stat.period;
+	u64 new_period = pair->stat.period;
 
 	return scnprintf(buf, size,
 		  "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
@@ -463,23 +463,23 @@ static void hists__compute_resort(struct hists *hists)
 	}
 }
 
-static void hists__process(struct hists *old, struct hists *new)
+static void hists__process(struct hists *base, struct hists *new)
 {
-	hists__match(new, old);
+	hists__match(base, new);
 
 	if (show_baseline_only)
-		hists__baseline_only(new);
+		hists__baseline_only(base);
 	else
-		hists__link(new, old);
+		hists__link(base, new);
 
 	if (sort_compute) {
-		hists__precompute(new);
-		hists__compute_resort(new);
+		hists__precompute(base);
+		hists__compute_resort(base);
 	} else {
-		hists__output_resort(new);
+		hists__output_resort(base);
 	}
 
-	hists__fprintf(new, true, 0, 0, stdout);
+	hists__fprintf(base, true, 0, 0, stdout);
 }
 
 static void data_process(void)
diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
index 19e3a78..a81f0c9 100644
--- a/tools/perf/ui/hist.c
+++ b/tools/perf/ui/hist.c
@@ -191,18 +191,8 @@ static int hpp__width_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 
 static double baseline_percent(struct hist_entry *he)
 {
-	struct hist_entry *pair = hist_entry__next_pair(he);
-	struct hists *pair_hists = pair ? pair->hists : NULL;
-	double percent = 0.0;
-
-	if (pair) {
-		u64 total_period = pair_hists->stats.total_period;
-		u64 base_period  = pair->stat.period;
-
-		percent = 100.0 * base_period / total_period;
-	}
-
-	return percent;
+	struct hists *hists = he->hists;
+	return 100.0 * he->stat.period / hists->stats.total_period;
 }
 
 static int hpp__color_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
@@ -210,10 +200,8 @@ static int hpp__color_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 {
 	double percent = baseline_percent(he);
 
-	if (hist_entry__has_pairs(he))
-		return percent_color_snprintf(hpp->buf, hpp->size, " %6.2f%%", percent);
-	else
-		return scnprintf(hpp->buf, hpp->size, "        ");
+	return percent_color_snprintf(hpp->buf, hpp->size, " %6.2f%%",
+				      percent);
 }
 
 static int hpp__entry_baseline(struct perf_hpp_fmt *_fmt __maybe_unused,
@@ -222,10 +210,7 @@ static int hpp__entry_baseline(struct perf_hpp_fmt *_fmt __maybe_unused,
 	double percent = baseline_percent(he);
 	const char *fmt = symbol_conf.field_sep ? "%.2f" : " %6.2f%%";
 
-	if (hist_entry__has_pairs(he) || symbol_conf.field_sep)
-		return scnprintf(hpp->buf, hpp->size, fmt, percent);
-	else
-		return scnprintf(hpp->buf, hpp->size, "            ");
+	return scnprintf(hpp->buf, hpp->size, fmt, percent);
 }
 
 static int hpp__header_samples(struct perf_hpp_fmt *_fmt __maybe_unused,
-- 
1.7.11.7