[PATCH 18/19] perf block-info: Allow selecting which columns to report and its order

[Arnaldo Carvalho de Melo]

From: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>

Currently we use a predefined array to set the block info output
formats, it's fixed and inflexible.

This patch adds two parameters "block_hpps" and "nr_hpps" in
block_info__create_report and other static functions, in order to let
user decide which columns to report and with specified report ordering.
It should be more flexible.

Buffers will be allocated to contain the new fmts, of course, we need to
release them before perf exits.

Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Jin Yao <yao.jin@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lore.kernel.org/lkml/20200202141655.32053-4-yao.jin@xxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/builtin-report.c  | 21 ++++++++++++---
 tools/perf/util/block-info.c | 51 +++++++++++++++++++++++++-----------
 tools/perf/util/block-info.h |  7 ++++-
 3 files changed, 59 insertions(+), 20 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 72a12b69f120..d7c905f7520f 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -104,6 +104,7 @@ struct report {
 	bool			symbol_ipc;
 	bool			total_cycles_mode;
 	struct block_report	*block_reports;
+	int			nr_block_reports;
 };
 
 static int report__config(const char *var, const char *value, void *cb)
@@ -966,8 +967,19 @@ static int __cmd_report(struct report *rep)
 	report__output_resort(rep);
 
 	if (rep->total_cycles_mode) {
+		int block_hpps[6] = {
+			PERF_HPP_REPORT__BLOCK_TOTAL_CYCLES_PCT,
+			PERF_HPP_REPORT__BLOCK_LBR_CYCLES,
+			PERF_HPP_REPORT__BLOCK_CYCLES_PCT,
+			PERF_HPP_REPORT__BLOCK_AVG_CYCLES,
+			PERF_HPP_REPORT__BLOCK_RANGE,
+			PERF_HPP_REPORT__BLOCK_DSO,
+		};
+
 		rep->block_reports = block_info__create_report(session->evlist,
-							       rep->total_cycles);
+							       rep->total_cycles,
+							       block_hpps, 6,
+							       &rep->nr_block_reports);
 		if (!rep->block_reports)
 			return -1;
 	}
@@ -1551,8 +1563,11 @@ int cmd_report(int argc, const char **argv)
 		zfree(&report.ptime_range);
 	}
 
-	if (report.block_reports)
-		zfree(&report.block_reports);
+	if (report.block_reports) {
+		block_info__free_report(report.block_reports,
+					report.nr_block_reports);
+		report.block_reports = NULL;
+	}
 
 	zstd_fini(&(session->zstd_data));
 	perf_session__delete(session);
diff --git a/tools/perf/util/block-info.c b/tools/perf/util/block-info.c
index 25f6422c548b..debb8b12cf51 100644
--- a/tools/perf/util/block-info.c
+++ b/tools/perf/util/block-info.c
@@ -373,33 +373,41 @@ static void hpp_register(struct block_fmt *block_fmt, int idx,
 }
 
 static void register_block_columns(struct perf_hpp_list *hpp_list,
-				   struct block_fmt *block_fmts)
+				   struct block_fmt *block_fmts,
+				   int *block_hpps, int nr_hpps)
 {
-	for (int i = 0; i < PERF_HPP_REPORT__BLOCK_MAX_INDEX; i++)
-		hpp_register(&block_fmts[i], i, hpp_list);
+	for (int i = 0; i < nr_hpps; i++)
+		hpp_register(&block_fmts[i], block_hpps[i], hpp_list);
 }
 
-static void init_block_hist(struct block_hist *bh, struct block_fmt *block_fmts)
+static void init_block_hist(struct block_hist *bh, struct block_fmt *block_fmts,
+			    int *block_hpps, int nr_hpps)
 {
 	__hists__init(&bh->block_hists, &bh->block_list);
 	perf_hpp_list__init(&bh->block_list);
 	bh->block_list.nr_header_lines = 1;
 
-	register_block_columns(&bh->block_list, block_fmts);
+	register_block_columns(&bh->block_list, block_fmts,
+			       block_hpps, nr_hpps);
 
-	perf_hpp_list__register_sort_field(&bh->block_list,
-		&block_fmts[PERF_HPP_REPORT__BLOCK_TOTAL_CYCLES_PCT].fmt);
+	/* Sort by the first fmt */
+	perf_hpp_list__register_sort_field(&bh->block_list, &block_fmts[0].fmt);
 }
 
-static void process_block_report(struct hists *hists,
-				 struct block_report *block_report,
-				 u64 total_cycles)
+static int process_block_report(struct hists *hists,
+				struct block_report *block_report,
+				u64 total_cycles, int *block_hpps,
+				int nr_hpps)
 {
 	struct rb_node *next = rb_first_cached(&hists->entries);
 	struct block_hist *bh = &block_report->hist;
 	struct hist_entry *he;
 
-	init_block_hist(bh, block_report->fmts);
+	if (nr_hpps > PERF_HPP_REPORT__BLOCK_MAX_INDEX)
+		return -1;
+
+	block_report->nr_fmts = nr_hpps;
+	init_block_hist(bh, block_report->fmts, block_hpps, nr_hpps);
 
 	while (next) {
 		he = rb_entry(next, struct hist_entry, rb_node);
@@ -408,16 +416,19 @@ static void process_block_report(struct hists *hists,
 		next = rb_next(&he->rb_node);
 	}
 
-	for (int i = 0; i < PERF_HPP_REPORT__BLOCK_MAX_INDEX; i++) {
+	for (int i = 0; i < nr_hpps; i++) {
 		block_report->fmts[i].total_cycles = total_cycles;
 		block_report->fmts[i].block_cycles = block_report->cycles;
 	}
 
 	hists__output_resort(&bh->block_hists, NULL);
+	return 0;
 }
 
 struct block_report *block_info__create_report(struct evlist *evlist,
-					       u64 total_cycles)
+					       u64 total_cycles,
+					       int *block_hpps, int nr_hpps,
+					       int *nr_reps)
 {
 	struct block_report *block_reports;
 	int nr_hists = evlist->core.nr_entries, i = 0;
@@ -430,13 +441,23 @@ struct block_report *block_info__create_report(struct evlist *evlist,
 	evlist__for_each_entry(evlist, pos) {
 		struct hists *hists = evsel__hists(pos);
 
-		process_block_report(hists, &block_reports[i], total_cycles);
+		process_block_report(hists, &block_reports[i], total_cycles,
+				     block_hpps, nr_hpps);
 		i++;
 	}
 
+	*nr_reps = nr_hists;
 	return block_reports;
 }
 
+void block_info__free_report(struct block_report *reps, int nr_reps)
+{
+	for (int i = 0; i < nr_reps; i++)
+		hists__delete_entries(&reps[i].hist.block_hists);
+
+	free(reps);
+}
+
 int report__browse_block_hists(struct block_hist *bh, float min_percent,
 			       struct evsel *evsel, struct perf_env *env,
 			       struct annotation_options *annotation_opts)
@@ -448,13 +469,11 @@ int report__browse_block_hists(struct block_hist *bh, float min_percent,
 		symbol_conf.report_individual_block = true;
 		hists__fprintf(&bh->block_hists, true, 0, 0, min_percent,
 			       stdout, true);
-		hists__delete_entries(&bh->block_hists);
 		return 0;
 	case 1:
 		symbol_conf.report_individual_block = true;
 		ret = block_hists_tui_browse(bh, evsel, min_percent,
 					     env, annotation_opts);
-		hists__delete_entries(&bh->block_hists);
 		return ret;
 	default:
 		return -1;
diff --git a/tools/perf/util/block-info.h b/tools/perf/util/block-info.h
index a0fa9fefeaf0..42e9dcc4cf0a 100644
--- a/tools/perf/util/block-info.h
+++ b/tools/perf/util/block-info.h
@@ -45,6 +45,7 @@ struct block_report {
 	struct block_hist	hist;
 	u64			cycles;
 	struct block_fmt	fmts[PERF_HPP_REPORT__BLOCK_MAX_INDEX];
+	int			nr_fmts;
 };
 
 struct block_hist;
@@ -70,7 +71,11 @@ int block_info__process_sym(struct hist_entry *he, struct block_hist *bh,
 			    u64 *block_cycles_aggr, u64 total_cycles);
 
 struct block_report *block_info__create_report(struct evlist *evlist,
-					       u64 total_cycles);
+					       u64 total_cycles,
+					       int *block_hpps, int nr_hpps,
+					       int *nr_reps);
+
+void block_info__free_report(struct block_report *reps, int nr_reps);
 
 int report__browse_block_hists(struct block_hist *bh, float min_percent,
 			       struct evsel *evsel, struct perf_env *env,
-- 
2.21.1