1 files changed, 25 insertions, 0 deletions

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index c2af1560e856..16ebbdd7b22e 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -501,6 +501,17 @@ static void print_graph_abs_time(u64 t, struct trace_seq *s)
 }
 
 static void
+print_graph_rel_time(struct trace_iterator *iter, struct trace_seq *s)
+{
+        unsigned long long usecs;
+
+        usecs = iter->ts - iter->trace_buffer->time_start;
+        do_div(usecs, NSEC_PER_USEC);
+
+        trace_seq_printf(s, "%9llu us |  ", usecs);
+}
+
+static void
 print_graph_irq(struct trace_iterator *iter, unsigned long addr,
                 enum trace_type type, int cpu, pid_t pid, u32 flags)
 {
@@ -517,6 +528,10 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
                 if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
                         print_graph_abs_time(iter->ts, s);
 
+                /* Relative time */
+                if (flags & TRACE_GRAPH_PRINT_REL_TIME)
+                        print_graph_rel_time(iter, s);
+
                 /* Cpu */
                 if (flags & TRACE_GRAPH_PRINT_CPU)
                         print_graph_cpu(s, cpu);
@@ -725,6 +740,10 @@ print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
         if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
                 print_graph_abs_time(iter->ts, s);
 
+        /* Relative time */
+        if (flags & TRACE_GRAPH_PRINT_REL_TIME)
+                print_graph_rel_time(iter, s);
+
         /* Cpu */
         if (flags & TRACE_GRAPH_PRINT_CPU)
                 print_graph_cpu(s, cpu);
@@ -1101,6 +1120,8 @@ static void print_lat_header(struct seq_file *s, u32 flags)
 
         if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
                 size += 16;
+        if (flags & TRACE_GRAPH_PRINT_REL_TIME)
+                size += 16;
         if (flags & TRACE_GRAPH_PRINT_CPU)
                 size += 4;
         if (flags & TRACE_GRAPH_PRINT_PROC)
@@ -1125,6 +1146,8 @@ static void __print_graph_headers_flags(struct trace_array *tr,
         seq_putc(s, '#');
         if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
                 seq_puts(s, "     TIME       ");
+        if (flags & TRACE_GRAPH_PRINT_REL_TIME)
+                seq_puts(s, "   REL TIME     ");
         if (flags & TRACE_GRAPH_PRINT_CPU)
                 seq_puts(s, " CPU");
         if (flags & TRACE_GRAPH_PRINT_PROC)
@@ -1139,6 +1162,8 @@ static void __print_graph_headers_flags(struct trace_array *tr,
         seq_putc(s, '#');
         if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
                 seq_puts(s, "      |         ");
+        if (flags & TRACE_GRAPH_PRINT_REL_TIME)
+                seq_puts(s, "      |         ");
         if (flags & TRACE_GRAPH_PRINT_CPU)
                 seq_puts(s, " |  ");
         if (flags & TRACE_GRAPH_PRINT_PROC)