tracing, function_graph: Add context-info support for function_graph tracer

The function_graph tracer does not follow global context-info option.
Adding TRACE_ITER_CONTEXT_INFO trace_flags check to enable it.

With following commands:
	# echo function_graph > ./current_tracer
	# echo 0 > options/context-info
	# cat trace

This is what it looked like before:
# tracer: function_graph
#
#     TIME        CPU  DURATION                  FUNCTION CALLS
#      |          |     |   |                     |   |   |   |
 1)   0.079 us    |          } /* __vma_link_rb */
 1)   0.056 us    |          copy_page_range();
 1)               |          security_vm_enough_memory() {
...

This is what it looks like now:
# tracer: function_graph
#
  } /* update_ts_time_stats */
  timekeeping_max_deferment();
...

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1307113131-10045-6-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 31 insertions, 22 deletions

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 1da5b97d2288..e8d6bb55d719 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -613,28 +613,30 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
                 addr >= (unsigned long)__irqentry_text_end)
                 return TRACE_TYPE_UNHANDLED;
 
-        /* Absolute time */
-        if (flags & TRACE_GRAPH_PRINT_ABS_TIME) {
-                ret = print_graph_abs_time(iter->ts, s);
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-        }
+        if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+                /* Absolute time */
+                if (flags & TRACE_GRAPH_PRINT_ABS_TIME) {
+                        ret = print_graph_abs_time(iter->ts, s);
+                        if (!ret)
+                                return TRACE_TYPE_PARTIAL_LINE;
+                }
 
-        /* Cpu */
-        if (flags & TRACE_GRAPH_PRINT_CPU) {
-                ret = print_graph_cpu(s, cpu);
-                if (ret == TRACE_TYPE_PARTIAL_LINE)
-                        return TRACE_TYPE_PARTIAL_LINE;
-        }
+                /* Cpu */
+                if (flags & TRACE_GRAPH_PRINT_CPU) {
+                        ret = print_graph_cpu(s, cpu);
+                        if (ret == TRACE_TYPE_PARTIAL_LINE)
+                                return TRACE_TYPE_PARTIAL_LINE;
+                }
 
-        /* Proc */
-        if (flags & TRACE_GRAPH_PRINT_PROC) {
-                ret = print_graph_proc(s, pid);
-                if (ret == TRACE_TYPE_PARTIAL_LINE)
-                        return TRACE_TYPE_PARTIAL_LINE;
-                ret = trace_seq_printf(s, " | ");
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
+                /* Proc */
+                if (flags & TRACE_GRAPH_PRINT_PROC) {
+                        ret = print_graph_proc(s, pid);
+                        if (ret == TRACE_TYPE_PARTIAL_LINE)
+                                return TRACE_TYPE_PARTIAL_LINE;
+                        ret = trace_seq_printf(s, " | ");
+                        if (!ret)
+                                return TRACE_TYPE_PARTIAL_LINE;
+                }
         }
 
         /* No overhead */
@@ -710,8 +712,9 @@ print_graph_duration(unsigned long long duration, struct trace_seq *s,
 {
         int ret = -1;
 
-        if (!(flags & TRACE_GRAPH_PRINT_DURATION))
-                return TRACE_TYPE_HANDLED;
+        if (!(flags & TRACE_GRAPH_PRINT_DURATION) ||
+            !(trace_flags & TRACE_ITER_CONTEXT_INFO))
+                        return TRACE_TYPE_HANDLED;
 
         /* No real adata, just filling the column with spaces */
         switch (duration) {
@@ -879,6 +882,9 @@ print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
                         return TRACE_TYPE_PARTIAL_LINE;
         }
 
+        if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
+                return 0;
+
         /* Absolute time */
         if (flags & TRACE_GRAPH_PRINT_ABS_TIME) {
                 ret = print_graph_abs_time(iter->ts, s);
@@ -1346,6 +1352,9 @@ void print_graph_headers_flags(struct seq_file *s, u32 flags)
 {
         struct trace_iterator *iter = s->private;
 
+        if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
+                return;
+
         if (trace_flags & TRACE_ITER_LATENCY_FMT) {
                 /* print nothing if the buffers are empty */
                 if (trace_empty(iter))