x86, ftrace, hw-branch-tracer: change trace format

Change the hw-branch-tracer format to be more readable.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/trace/trace_hw_branches.c

@@ -146,26 +146,23 @@ static void bts_trace_reset(struct trace_array *tr)
 
 static void bts_trace_print_header(struct seq_file *m)
 {
-	seq_puts(m,
-		 "# CPU#        FROM                   TO         FUNCTION\n");
-	seq_puts(m,
-		 "#  |           |                     |             |\n");
+	seq_puts(m, "# CPU#        TO  <-  FROM\n");
 }
 
 static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
 {
 	struct trace_entry *entry = iter->ent;
 	struct trace_seq *seq = &iter->seq;
 	struct hw_branch_entry *it;
+	unsigned long symflags = TRACE_ITER_SYM_OFFSET;
 
 	trace_assign_type(it, entry);
 
 	if (entry->type == TRACE_HW_BRANCHES) {
 		if (trace_seq_printf(seq, "%4d  ", entry->cpu) &&
-		    trace_seq_printf(seq, "0x%016llx -> 0x%016llx ",
-				     it->from, it->to) &&
-		    (!it->from ||
-		     seq_print_ip_sym(seq, it->from, /* sym_flags = */ 0)) &&
+		    seq_print_ip_sym(seq, it->to, symflags) &&
+		    trace_seq_printf(seq, "\t  <-  ") &&
+		    seq_print_ip_sym(seq, it->from, symflags) &&
 		    trace_seq_printf(seq, "\n"))
 			return TRACE_TYPE_HANDLED;
 		return TRACE_TYPE_PARTIAL_LINE;;