perf report: Auto-detect branch stack sampling mode
This patch enhances perf report to auto-detect when the
perf.data file contains samples with branch stacks. That way it
is not necessary to use the -b option.
To force branch view mode to off, simply use --no-branch-stack.
Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: acme@redhat.com
Cc: asharma@fb.com
Cc: ravitillo@lbl.gov
Cc: vweaver1@eecs.utk.edu
Cc: khandual@linux.vnet.ibm.com
Cc: dsahern@gmail.com
Link: http://lkml.kernel.org/r/1331246868-19905-4-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 2739ed1..88dbcf6 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -8,7 +8,7 @@
const char *sort_order = default_sort_order;
int sort__need_collapse = 0;
int sort__has_parent = 0;
-bool sort__branch_mode;
+int sort__branch_mode = -1; /* -1 = means not set */
enum sort_type sort__first_dimension;