perf tools: Bind callchains to the first sort dimension column

Currently, the callchains are displayed using a constant left
margin. So depending on the current sort dimension
configuration, callchains may appear to be well attached to the
first sort dimension column field which is mostly the case,
except when the first dimension of sorting is done by comm,
because these are right aligned.

This patch binds the callchain to the first letter in the first
column, whatever type of column it is (dso, comm, symbol).
Before:

     0.80%             perf  [k] __lock_acquire
             __lock_acquire
             lock_acquire
             |
             |--58.33%-- _spin_lock
             |          |
             |          |--28.57%-- inotify_should_send_event
             |          |          fsnotify
             |          |          __fsnotify_parent

After:

     0.80%             perf  [k] __lock_acquire
                       __lock_acquire
                       lock_acquire
                       |
                       |--58.33%-- _spin_lock
                       |          |
                       |          |--28.57%-- inotify_should_send_event
                       |          |          fsnotify
                       |          |          __fsnotify_parent

Also, for clarity, we don't put anymore the callchain as is but:

- If we have a top level ancestor in the callchain, start it
  with a first ascii hook.

  Before:

     0.80%             perf  [kernel]                        [k] __lock_acquire
                       __lock_acquire
                         lock_acquire
                       |
                       |--58.33%-- _spin_lock
                       |          |
                       |          |--28.57%-- inotify_should_send_event
                       |          |          fsnotify
                      [..]       [..]

   After:

     0.80%             perf  [kernel]                         [k] __lock_acquire
                       |
                       --- __lock_acquire
                           lock_acquire
                          |
                          |--58.33%-- _spin_lock
                          |          |
                          |          |--28.57%-- inotify_should_send_event
                          |          |          fsnotify
                         [..]       [..]

- Otherwise, if we have several top level ancestors, then
  display these like we did before:

       1.69%           Xorg
                       |
                       |--21.21%-- vread_hpet
                       |          0x7fffd85b46fc
                       |          0x7fffd85b494d
                       |          0x7f4fafb4e54d
                       |
                       |--15.15%-- exaOffscreenAlloc
                       |
                       |--9.09%-- I830WaitLpRing

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Anton Blanchard <anton@samba.org>
LKML-Reference: <1256246604-17156-2-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 63 insertions, 19 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 3d8c52220f1..72d58421223 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -59,12 +59,28 @@ static struct perf_header *header;
 
 static u64		sample_type;
 
-static size_t ipchain__fprintf_graph_line(FILE *fp, int depth, int depth_mask)
+
+static size_t
+callchain__fprintf_left_margin(FILE *fp, int left_margin)
+{
+	int i;
+	int ret;
+
+	ret = fprintf(fp, "            ");
+
+	for (i = 0; i < left_margin; i++)
+		ret += fprintf(fp, " ");
+
+	return ret;
+}
+
+static size_t ipchain__fprintf_graph_line(FILE *fp, int depth, int depth_mask,
+					  int left_margin)
 {
 	int i;
 	size_t ret = 0;
 
-	ret += fprintf(fp, "%s", "                ");
+	ret += callchain__fprintf_left_margin(fp, left_margin);
 
 	for (i = 0; i < depth; i++)
 		if (depth_mask & (1 << i))
@@ -79,12 +95,12 @@ static size_t ipchain__fprintf_graph_line(FILE *fp, int depth, int depth_mask)
 static size_t
 ipchain__fprintf_graph(FILE *fp, struct callchain_list *chain, int depth,
 		       int depth_mask, int count, u64 total_samples,
-		       int hits)
+		       int hits, int left_margin)
 {
 	int i;
 	size_t ret = 0;
 
-	ret += fprintf(fp, "%s", "                ");
+	ret += callchain__fprintf_left_margin(fp, left_margin);
 	for (i = 0; i < depth; i++) {
 		if (depth_mask & (1 << i))
 			ret += fprintf(fp, "|");
@@ -123,7 +139,8 @@ static void init_rem_hits(void)
 
 static size_t
 __callchain__fprintf_graph(FILE *fp, struct callchain_node *self,
-			   u64 total_samples, int depth, int depth_mask)
+			   u64 total_samples, int depth, int depth_mask,
+			   int left_margin)
 {
 	struct rb_node *node, *next;
 	struct callchain_node *child;
@@ -164,7 +181,8 @@ __callchain__fprintf_graph(FILE *fp, struct callchain_node *self,
 		 * But we keep the older depth mask for the line seperator
 		 * to keep the level link until we reach the last child
 		 */
-		ret += ipchain__fprintf_graph_line(fp, depth, depth_mask);
+		ret += ipchain__fprintf_graph_line(fp, depth, depth_mask,
+						   left_margin);
 		i = 0;
 		list_for_each_entry(chain, &child->val, list) {
 			if (chain->ip >= PERF_CONTEXT_MAX)
@@ -172,11 +190,13 @@ __callchain__fprintf_graph(FILE *fp, struct callchain_node *self,
 			ret += ipchain__fprintf_graph(fp, chain, depth,
 						      new_depth_mask, i++,
 						      new_total,
-						      cumul);
+						      cumul,
+						      left_margin);
 		}
 		ret += __callchain__fprintf_graph(fp, child, new_total,
 						  depth + 1,
-						  new_depth_mask | (1 << depth));
+						  new_depth_mask | (1 << depth),
+						  left_margin);
 		node = next;
 	}
 
@@ -190,17 +210,19 @@ __callchain__fprintf_graph(FILE *fp, struct callchain_node *self,
 
 		ret += ipchain__fprintf_graph(fp, &rem_hits, depth,
 					      new_depth_mask, 0, new_total,
-					      remaining);
+					      remaining, left_margin);
 	}
 
 	return ret;
 }
 
+
 static size_t
 callchain__fprintf_graph(FILE *fp, struct callchain_node *self,
-			 u64 total_samples)
+			 u64 total_samples, int left_margin)
 {
 	struct callchain_list *chain;
+	bool printed = false;
 	int i = 0;
 	int ret = 0;
 
@@ -208,17 +230,27 @@ callchain__fprintf_graph(FILE *fp, struct callchain_node *self,
 		if (chain->ip >= PERF_CONTEXT_MAX)
 			continue;
 
-		if (!i++ && sort_by_sym_first)
+		if (!i++ && sort__first_dimension == SORT_SYM)
 			continue;
 
+		if (!printed) {
+			ret += callchain__fprintf_left_margin(fp, left_margin);
+			ret += fprintf(fp, "|\n");
+			ret += callchain__fprintf_left_margin(fp, left_margin);
+			ret += fprintf(fp, "---");
+
+			left_margin += 3;
+			printed = true;
+		} else
+			ret += callchain__fprintf_left_margin(fp, left_margin);
+
 		if (chain->sym)
-			ret += fprintf(fp, "                %s\n", chain->sym->name);
+			ret += fprintf(fp, " %s\n", chain->sym->name);
 		else
-			ret += fprintf(fp, "                %p\n",
-					(void *)(long)chain->ip);
+			ret += fprintf(fp, " %p\n", (void *)(long)chain->ip);
 	}
 
-	ret += __callchain__fprintf_graph(fp, self, total_samples, 1, 1);
+	ret += __callchain__fprintf_graph(fp, self, total_samples, 1, 1, left_margin);
 
 	return ret;
 }
@@ -251,7 +283,7 @@ callchain__fprintf_flat(FILE *fp, struct callchain_node *self,
 
 static size_t
 hist_entry_callchain__fprintf(FILE *fp, struct hist_entry *self,
-			      u64 total_samples)
+			      u64 total_samples, int left_margin)
 {
 	struct rb_node *rb_node;
 	struct callchain_node *chain;
@@ -271,7 +303,8 @@ hist_entry_callchain__fprintf(FILE *fp, struct hist_entry *self,
 			break;
 		case CHAIN_GRAPH_ABS: /* Falldown */
 		case CHAIN_GRAPH_REL:
-			ret += callchain__fprintf_graph(fp, chain, total_samples);
+			ret += callchain__fprintf_graph(fp, chain, total_samples,
+							left_margin);
 		case CHAIN_NONE:
 		default:
 			break;
@@ -316,8 +349,19 @@ hist_entry__fprintf(FILE *fp, struct hist_entry *self, u64 total_samples)
 
 	ret += fprintf(fp, "\n");
 
-	if (callchain)
-		hist_entry_callchain__fprintf(fp, self, total_samples);
+	if (callchain) {
+		int left_margin = 0;
+
+		if (sort__first_dimension == SORT_COMM) {
+			se = list_first_entry(&hist_entry__sort_list, typeof(*se),
+						list);
+			left_margin = se->width ? *se->width : 0;
+			left_margin -= thread__comm_len(self->thread);
+		}
+
+		hist_entry_callchain__fprintf(fp, self, total_samples,
+					      left_margin);
+	}
 
 	return ret;
 }