[PATCH 2/5] perf report: Fix indentation of dynamic entries in hierarchy

[Namhyung Kim <namhyung@kernel.org>]

When dynamic entries are used in the hierarchy mode with multiple
events, the output might not be aligned properly.  In the hierarchy
mode, the each sort column is indented using total number of sort keys.
So it keeps track of number of sort keys when adding them.  However
a dynamic sort key can be added more than once when multiple events have
same field names.  This results in unnecessarily long indentation in the
output.

For example perf kmem records following events:

  $ perf evlist --trace-fields -i perf.data.kmem
  kmem:kmalloc: trace_fields: call_site,ptr,bytes_req,bytes_alloc,gfp_flags
  kmem:kmalloc_node: trace_fields: call_site,ptr,bytes_req,bytes_alloc,gfp_flags,node
  kmem:kfree: trace_fields: call_site,ptr
  kmem:kmem_cache_alloc: trace_fields: call_site,ptr,bytes_req,bytes_alloc,gfp_flags
  kmem:kmem_cache_alloc_node: trace_fields: call_site,ptr,bytes_req,bytes_alloc,gfp_flags,node
  kmem:kmem_cache_free: trace_fields: call_site,ptr
  kmem:mm_page_alloc: trace_fields: page,order,gfp_flags,migratetype
  kmem:mm_page_free: trace_fields: page,order

As you can see, many field names shared between kmem events.  So adding
'ptr' dynamic sort key alone will set nr_sort_keys to 6.  And this adds
many unnecessary spaces between columns.

Before:

  $ perf report -i perf.data.kmem --hierarchy -s ptr -g none --stdio
  ...
  #                Overhead                 ptr
  # .......................  ...................................
  #
      99.89%                 0xffff8803ffb79720
       0.06%                 0xffff8803d228a000
       0.03%                 0xffff8803f7678f00
       0.00%                 0xffff880401dc5280
       0.00%                 0xffff880406172380
       0.00%                 0xffff8803ffac3a00
       0.00%                 0xffff8803ffac1600

After:

  # Overhead                 ptr
  # ........  ....................
  #
      99.89%  0xffff8803ffb79720
       0.06%  0xffff8803d228a000
       0.03%  0xffff8803f7678f00
       0.00%  0xffff880401dc5280
       0.00%  0xffff880406172380
       0.00%  0xffff8803ffac3a00
       0.00%  0xffff8803ffac1600

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/ui/browsers/hists.c |  6 +++---
 tools/perf/ui/stdio/hist.c     |  6 +++---
 tools/perf/util/hist.h         |  1 +
 tools/perf/util/sort.c         | 19 +++++++++++++++++++
 4 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 71c6d510390f..5f74c6723c53 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1547,7 +1547,7 @@ static int hists_browser__scnprintf_hierarchy_headers(struct hist_browser *brows
 	struct perf_hpp_fmt *fmt;
 	size_t ret = 0;
 	int column = 0;
-	int nr_sort_keys = hists->hpp_list->nr_sort_keys;
+	int nr_sort_keys = hists->nr_sort_keys;
 	bool first = true;
 
 	ret = scnprintf(buf, size, " ");
@@ -1632,7 +1632,7 @@ static unsigned int hist_browser__refresh(struct ui_browser *browser)
 	u16 header_offset = 0;
 	struct rb_node *nd;
 	struct hist_browser *hb = container_of(browser, struct hist_browser, b);
-	int nr_sort = hb->hists->hpp_list->nr_sort_keys;
+	int nr_sort = hb->hists->nr_sort_keys;
 
 	if (hb->show_headers) {
 		hist_browser__show_headers(hb);
@@ -1969,7 +1969,7 @@ static int hist_browser__fprintf(struct hist_browser *browser, FILE *fp)
 	struct rb_node *nd = hists__filter_entries(rb_first(browser->b.entries),
 						   browser->min_pcnt);
 	int printed = 0;
-	int nr_sort = browser->hists->hpp_list->nr_sort_keys;
+	int nr_sort = browser->hists->nr_sort_keys;
 
 	while (nd) {
 		struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);
diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
index b3bdfcb245f9..5733d6c196be 100644
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -495,7 +495,7 @@ static int hist_entry__fprintf(struct hist_entry *he, size_t size,
 		size = hpp.size = bfsz;
 
 	if (symbol_conf.report_hierarchy) {
-		int nr_sort = hists->hpp_list->nr_sort_keys;
+		int nr_sort = hists->nr_sort_keys;
 
 		return hist_entry__hierarchy_fprintf(he, &hpp, nr_sort,
 						     hists, fp);
@@ -529,7 +529,7 @@ static int print_hierarchy_header(struct hists *hists, struct perf_hpp *hpp,
 	unsigned header_width = 0;
 	struct perf_hpp_fmt *fmt;
 
-	nr_sort = hists->hpp_list->nr_sort_keys;
+	nr_sort = hists->nr_sort_keys;
 
 	/* preserve max indent depth for column headers */
 	print_hierarchy_indent(sep, nr_sort, spaces, fp);
@@ -728,7 +728,7 @@ print_entries:
 		 * display "no entry >= x.xx%" message.
 		 */
 		if (!h->leaf && !hist_entry__has_hierarchy_children(h, min_pcnt)) {
-			int nr_sort = hists->hpp_list->nr_sort_keys;
+			int nr_sort = hists->nr_sort_keys;
 
 			print_hierarchy_indent(sep, nr_sort + h->depth + 1, spaces, fp);
 			fprintf(fp, "%*sno entry >= %.2f%%\n", indent, "", min_pcnt);
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 283a3e11358c..f4ef513527ba 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -78,6 +78,7 @@ struct hists {
 	u16			col_len[HISTC_NR_COLS];
 	int			socket_filter;
 	struct perf_hpp_list	*hpp_list;
+	int			nr_sort_keys;
 };
 
 struct hist_entry_iter;
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 83b218c57fe2..e948fcac0939 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -2641,6 +2641,9 @@ out:
 int setup_sorting(struct perf_evlist *evlist)
 {
 	int err;
+	struct hists *hists;
+	struct perf_evsel *evsel;
+	struct perf_hpp_fmt *fmt;
 
 	err = __setup_sorting(evlist);
 	if (err < 0)
@@ -2652,6 +2655,22 @@ int setup_sorting(struct perf_evlist *evlist)
 			return err;
 	}
 
+	evlist__for_each(evlist, evsel) {
+		hists = evsel__hists(evsel);
+		hists->nr_sort_keys = perf_hpp_list.nr_sort_keys;
+
+		/*
+		 * If dynamic entries were used, it might add multiple
+		 * entries to each evsel for a single field name.  Set
+		 * actual number of sort keys for each hists.
+		 */
+		perf_hpp_list__for_each_sort_list(&perf_hpp_list, fmt) {
+			if (perf_hpp__is_dynamic_entry(fmt) &&
+			    !perf_hpp__defined_dynamic_entry(fmt, hists))
+				hists->nr_sort_keys--;
+		}
+	}
+
 	reset_dimensions();
 
 	/*
-- 
2.7.1