perf report: Update column width of dynamic entries

The column width of dynamic entries is updated when comparing hist
entries.  However some unique entries can miss the chance to update.  So
move the update to output resort stage to make sure every entry will get
called before display.

To do that, abuse ->sort callback to update the width when the third
argument is NULL.  When resorting entries in normal path, it never be
NULL so it should be fine IMHO.

Before:

  #       Overhead  ptr / bytes_req / gfp_flags
  # ..............  ..........................................
  #
      37.50%        0xffff8803f7669400
         37.50%        448
            37.50%        GFP_ATOMIC|GFP_NOWARN|GFP_NOMEMALLOC
      10.42%        0xffff8803f766be00
          8.33%        96
             8.33%        GFP_ATOMIC|GFP_NOWARN|GFP_NOMEMALLOC
          2.08%        512
             2.08%        GFP_KERNEL|GFP_NOWARN|GFP_REPEAT|GFP   <-- here

After:

  #       Overhead  ptr / bytes_req / gfp_flags
  # ..............  .....................................................
  #
      37.50%        0xffff8803f7669400
         37.50%        448
            37.50%        GFP_ATOMIC|GFP_NOWARN|GFP_NOMEMALLOC
      10.42%        0xffff8803f766be00
          8.33%        96
             8.33%        GFP_ATOMIC|GFP_NOWARN|GFP_NOMEMALLOC
          2.08%        512
             2.08%        GFP_KERNEL|GFP_NOWARN|GFP_REPEAT|GFP_NOMEMALLOC

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1456512767-1164-5-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 16 insertions, 3 deletions

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 9b3f582867d6..4b8b67bc0cd8 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -1371,6 +1371,10 @@ static void hierarchy_insert_output_entry(struct rb_root *root,
 
 	rb_link_node(&he->rb_node, parent, p);
 	rb_insert_color(&he->rb_node, root);
+
+	/* update column width of dynamic entry */
+	if (perf_hpp__is_dynamic_entry(he->fmt))
+		he->fmt->sort(he->fmt, he, NULL);
 }
 
 static void hists__hierarchy_output_resort(struct hists *hists,
@@ -1440,6 +1444,7 @@ static void __hists__insert_output_entry(struct rb_root *entries,
 	struct rb_node **p = &entries->rb_node;
 	struct rb_node *parent = NULL;
 	struct hist_entry *iter;
+	struct perf_hpp_fmt *fmt;
 
 	if (use_callchain) {
 		if (callchain_param.mode == CHAIN_GRAPH_REL) {
@@ -1466,6 +1471,12 @@ static void __hists__insert_output_entry(struct rb_root *entries,
 
 	rb_link_node(&he->rb_node, parent, p);
 	rb_insert_color(&he->rb_node, entries);
+
+	perf_hpp_list__for_each_sort_list(&perf_hpp_list, fmt) {
+		if (perf_hpp__is_dynamic_entry(fmt) &&
+		    perf_hpp__defined_dynamic_entry(fmt, he->hists))
+			fmt->sort(fmt, he, NULL);  /* update column width */
+	}
 }
 
 static void output_resort(struct hists *hists, struct ui_progress *prog,
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index d26c6b9fe348..5888bfe9a193 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -1816,6 +1816,11 @@ static int64_t __sort__hde_cmp(struct perf_hpp_fmt *fmt,
 
 	hde = container_of(fmt, struct hpp_dynamic_entry, hpp);
 
+	if (b == NULL) {
+		update_dynamic_len(hde, a);
+		return 0;
+	}
+
 	field = hde->field;
 	if (field->flags & FIELD_IS_DYNAMIC) {
 		unsigned long long dyn;
@@ -1830,9 +1835,6 @@ static int64_t __sort__hde_cmp(struct perf_hpp_fmt *fmt,
 	} else {
 		offset = field->offset;
 		size = field->size;
-
-		update_dynamic_len(hde, a);
-		update_dynamic_len(hde, b);
 	}
 
 	return memcmp(a->raw_data + offset, b->raw_data + offset, size);