[tip:perf/core] perf report: Update column width of dynamic entries

[tip-bot for Namhyung Kim]

Commit-ID:  abab5e7fcec16e526968f8a5448cd81c635705ce
Gitweb:     http://git.kernel.org/tip/abab5e7fcec16e526968f8a5448cd81c635705ce
Author:     Namhyung Kim <namhyung@xxxxxxxxxx>
AuthorDate: Sat, 27 Feb 2016 03:52:47 +0900
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 26 Feb 2016 19:38:48 -0300

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@xxxxxxxxxx>
Tested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1456512767-1164-5-git-send-email-namhyung@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/hist.c | 11 +++++++++++
 tools/perf/util/sort.c |  8 +++++---
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 9b3f582..4b8b67b 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 d26c6b9..5888bfe 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);