3 files changed, 33 insertions, 3 deletions

diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index bd365988e8d8..2479b2a0c77c 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -2003,6 +2003,32 @@ want, depending on your needs.
   360.774530 |   1)   0.594 us    |                                          __phys_addr();
 
 
+The function name is always displayed after the closing bracket
+for a function if the start of that function is not in the
+trace buffer.
+
+Display of the function name after the closing bracket may be
+enabled for functions whose start is in the trace buffer,
+allowing easier searching with grep for function durations.
+It is default disabled.
+
+        hide: echo nofuncgraph-tail > trace_options
+        show: echo funcgraph-tail > trace_options
+
+  Example with nofuncgraph-tail (default):
+  0)               |      putname() {
+  0)               |        kmem_cache_free() {
+  0)   0.518 us    |          __phys_addr();
+  0)   1.757 us    |        }
+  0)   2.861 us    |      }
+
+  Example with funcgraph-tail:
+  0)               |      putname() {
+  0)               |        kmem_cache_free() {
+  0)   0.518 us    |          __phys_addr();
+  0)   1.757 us    |        } /* kmem_cache_free() */
+  0)   2.861 us    |      } /* putname() */
+
 You can put some comments on specific functions by using
 trace_printk() For example, if you want to put a comment inside
 the __might_sleep() function, you just have to include
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 68050633255e..217207ad60b3 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -725,6 +725,7 @@ extern unsigned long trace_flags;
 #define TRACE_GRAPH_PRINT_DURATION      0x10
 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
 #define TRACE_GRAPH_PRINT_IRQS          0x40
+#define TRACE_GRAPH_PRINT_TAIL          0x80
 #define TRACE_GRAPH_PRINT_FILL_SHIFT    28
 #define TRACE_GRAPH_PRINT_FILL_MASK     (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
 
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index af08dd531cb8..4de3e57f723c 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -55,11 +55,13 @@ static struct tracer_opt trace_opts[] = {
         { TRACER_OPT(funcgraph-abstime, TRACE_GRAPH_PRINT_ABS_TIME) },
         /* Display interrupts */
         { TRACER_OPT(funcgraph-irqs, TRACE_GRAPH_PRINT_IRQS) },
+        /* Display function name after trailing } */
+        { TRACER_OPT(funcgraph-tail, TRACE_GRAPH_PRINT_TAIL) },
         { } /* Empty entry */
 };
 
 static struct tracer_flags tracer_flags = {
-        /* Don't display overruns and proc by default */
+        /* Don't display overruns, proc, or tail by default */
         .val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD |
                TRACE_GRAPH_PRINT_DURATION | TRACE_GRAPH_PRINT_IRQS,
         .opts = trace_opts
@@ -1167,9 +1169,10 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
          * If the return function does not have a matching entry,
          * then the entry was lost. Instead of just printing
          * the '}' and letting the user guess what function this
-         * belongs to, write out the function name.
+         * belongs to, write out the function name. Always do
+         * that if the funcgraph-tail option is enabled.
          */
-        if (func_match) {
+        if (func_match && !(flags & TRACE_GRAPH_PRINT_TAIL)) {
                 ret = trace_seq_puts(s, "}\n");
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;