perf tools: Skip dynamic fields not defined for current event

When there are multiple events, each dynamic sort key is defined just
for one event.  In this case other events will always show "N/A" for
those fields.  But they are meaningless and consume precious screen
width.

Let's skip those undefined dynamic fields.

  $ perf record -e kmem:kmalloc,kmem:kfree -a sleep 1

  $ perf report -s 'comm,kmalloc.*' --stdio
  # To display the perf.data header info, please use --header/--header-only options.
  #
  #
  # Total Lost Samples: 0
  #
  # Samples: 20K of event 'kmem:kmalloc'
  # Event count (approx.): 20533
  #
  # Overhead  Command           call_site                 ptr  bytes_req  bytes_alloc            gfp_flags
  # ........  .......  ..................  ..................  .........  ...........  ...................
  #
      99.89%  perf       ffffffffa01d4396  0xffff8803ffb79720         96           96    GFP_NOFS|GFP_ZERO
       0.06%  sleep      ffffffff8114e1cd  0xffff8803d228a000       4096         4096           GFP_KERNEL
       0.03%  perf       ffffffff811d6ae6  0xffff8803f7678f00        240          256  GFP_KERNEL|GFP_ZERO
       0.00%  perf       ffffffff812263c1  0xffff880406172380        128          128           GFP_KERNEL
       0.00%  perf       ffffffff812264b9  0xffff8803ffac1600        504          512           GFP_KERNEL
       0.00%  perf       ffffffff81226634  0xffff880401dc5280         28           32           GFP_KERNEL
       0.00%  sleep      ffffffff81226da9  0xffff8803ffac3a00        392          512           GFP_KERNEL

  # Samples: 20K of event 'kmem:kfree'
  # Event count (approx.): 20597
  #
  # Overhead  Command
  # ........  ..............
  #
      99.63%  perf
       0.14%  sleep
       0.11%  irq/36-iwlwifi
       0.11%  kworker/u16:0
       0.01%  Xorg
       0.00%  firefox

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1450804030-29193-12-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/browsers/hists.c

@@ -1041,7 +1041,8 @@ static int hist_browser__show_entry(struct hist_browser *browser,
 		hist_browser__gotorc(browser, row, 0);
 
 		perf_hpp__for_each_format(fmt) {
-			if (perf_hpp__should_skip(fmt) || column++ < browser->b.horiz_scroll)
+			if (perf_hpp__should_skip(fmt, entry->hists) ||
+			    column++ < browser->b.horiz_scroll)
 				continue;
 
 			if (current_entry && browser->b.navkeypressed) {
@@ -1144,7 +1145,7 @@ static int hists_browser__scnprintf_headers(struct hist_browser *browser, char *
 	}
 
 	perf_hpp__for_each_format(fmt) {
-		if (perf_hpp__should_skip(fmt)  || column++ < browser->b.horiz_scroll)
+		if (perf_hpp__should_skip(fmt, hists)  || column++ < browser->b.horiz_scroll)
 			continue;
 
 		ret = fmt->header(fmt, &dummy_hpp, hists_to_evsel(hists));
@@ -1414,7 +1415,7 @@ static int hist_browser__fprintf_entry(struct hist_browser *browser,
 		printed += fprintf(fp, "%c ", folded_sign);
 
 	perf_hpp__for_each_format(fmt) {
-		if (perf_hpp__should_skip(fmt))
+		if (perf_hpp__should_skip(fmt, he->hists))
 			continue;
 
 		if (!first) {

tools/perf/ui/gtk/hists.c

@@ -318,7 +318,7 @@ static void perf_gtk__show_hists(GtkWidget *window, struct hists *hists,
 	col_idx = 0;
 
 	perf_hpp__for_each_format(fmt) {
-		if (perf_hpp__should_skip(fmt))
+		if (perf_hpp__should_skip(fmt, hists))
 			continue;
 
 		/*
@@ -368,7 +368,7 @@ static void perf_gtk__show_hists(GtkWidget *window, struct hists *hists,
 		col_idx = 0;
 
 		perf_hpp__for_each_format(fmt) {
-			if (perf_hpp__should_skip(fmt))
+			if (perf_hpp__should_skip(fmt, h->hists))
 				continue;
 
 			if (fmt->color)

tools/perf/ui/hist.c

@@ -619,7 +619,7 @@ unsigned int hists__sort_list_width(struct hists *hists)
 	struct perf_hpp dummy_hpp;
 
 	perf_hpp__for_each_format(fmt) {
-		if (perf_hpp__should_skip(fmt))
+		if (perf_hpp__should_skip(fmt, hists))
 			continue;
 
 		if (first)

tools/perf/ui/stdio/hist.c

@@ -385,7 +385,7 @@ static int hist_entry__snprintf(struct hist_entry *he, struct perf_hpp *hpp)
 		return 0;
 
 	perf_hpp__for_each_format(fmt) {
-		if (perf_hpp__should_skip(fmt))
+		if (perf_hpp__should_skip(fmt, he->hists))
 			continue;
 
 		/*
@@ -464,7 +464,7 @@ size_t hists__fprintf(struct hists *hists, bool show_header, int max_rows,
 	fprintf(fp, "# ");
 
 	perf_hpp__for_each_format(fmt) {
-		if (perf_hpp__should_skip(fmt))
+		if (perf_hpp__should_skip(fmt, hists))
 			continue;
 
 		if (!first)
@@ -490,7 +490,7 @@ size_t hists__fprintf(struct hists *hists, bool show_header, int max_rows,
 	perf_hpp__for_each_format(fmt) {
 		unsigned int i;
 
-		if (perf_hpp__should_skip(fmt))
+		if (perf_hpp__should_skip(fmt, hists))
 			continue;
 
 		if (!first)

tools/perf/util/hist.c

@@ -1112,7 +1112,7 @@ static int hist_entry__sort(struct hist_entry *a, struct hist_entry *b)
 	int64_t cmp = 0;
 
 	perf_hpp__for_each_sort_list(fmt) {
-		if (perf_hpp__should_skip(fmt))
+		if (perf_hpp__should_skip(fmt, a->hists))
 			continue;
 
 		cmp = fmt->sort(fmt, a, b);

tools/perf/util/hist.h

@@ -262,10 +262,20 @@ void perf_hpp__append_sort_keys(void);
 
 bool perf_hpp__is_sort_entry(struct perf_hpp_fmt *format);
 bool perf_hpp__same_sort_entry(struct perf_hpp_fmt *a, struct perf_hpp_fmt *b);
+bool perf_hpp__is_dynamic_entry(struct perf_hpp_fmt *format);
+bool perf_hpp__defined_dynamic_entry(struct perf_hpp_fmt *fmt, struct hists *hists);
 
-static inline bool perf_hpp__should_skip(struct perf_hpp_fmt *format)
+static inline bool perf_hpp__should_skip(struct perf_hpp_fmt *format,
+					 struct hists *hists)
 {
-	return format->elide;
+	if (format->elide)
+		return true;
+
+	if (perf_hpp__is_dynamic_entry(format) &&
+	    !perf_hpp__defined_dynamic_entry(format, hists))
+		return true;
+
+	return false;
 }
 
 void perf_hpp__reset_width(struct perf_hpp_fmt *fmt, struct hists *hists);

tools/perf/util/sort.c

@@ -1698,6 +1698,15 @@ static int __sort__hde_width(struct perf_hpp_fmt *fmt,
 	return len;
 }
 
+bool perf_hpp__defined_dynamic_entry(struct perf_hpp_fmt *fmt, struct hists *hists)
+{
+	struct hpp_dynamic_entry *hde;
+
+	hde = container_of(fmt, struct hpp_dynamic_entry, hpp);
+
+	return hists_to_evsel(hists) == hde->evsel;
+}
+
 static int __sort__hde_entry(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
 			     struct hist_entry *he)
 {
@@ -1714,9 +1723,6 @@ static int __sort__hde_entry(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
 	if (!len)
 		len = hde_width(hde);
 
-	if (hists_to_evsel(he->hists) != hde->evsel)
-		return scnprintf(hpp->buf, hpp->size, "%*.*s", len, len, "N/A");
-
 	if (hde->raw_trace)
 		goto raw_field;
 
@@ -1769,9 +1775,6 @@ static int64_t __sort__hde_cmp(struct perf_hpp_fmt *fmt,
 
 	hde = container_of(fmt, struct hpp_dynamic_entry, hpp);
 
-	if (hists_to_evsel(a->hists) != hde->evsel)
-		return 0;
-
 	field = hde->field;
 	if (field->flags & FIELD_IS_DYNAMIC) {
 		unsigned long long dyn;
@@ -1794,6 +1797,11 @@ static int64_t __sort__hde_cmp(struct perf_hpp_fmt *fmt,
 	return memcmp(a->raw_data + offset, b->raw_data + offset, size);
 }
 
+bool perf_hpp__is_dynamic_entry(struct perf_hpp_fmt *fmt)
+{
+	return fmt->cmp == __sort__hde_cmp;
+}
+
 static struct hpp_dynamic_entry *
 __alloc_dynamic_entry(struct perf_evsel *evsel, struct format_field *field)
 {