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>

1 files changed, 5 insertions, 8 deletions

diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c
index 372b47ac3154..fff3545fc866 100644
--- a/kernel/trace/trace_hw_branches.c
+++ b/kernel/trace/trace_hw_branches.c
@@ -146,10 +146,7 @@ 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)
@@ -157,15 +154,15 @@ 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;;