trace-graph: Give a better CPU color difference in task plots

The CPU color for task plots is a bit close at the lower end. Add
some salt to the algorithm to spread it out a bit more.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/trace-plot-task.c b/trace-plot-task.c
index 6ba4fb1..794b889 100644
--- a/trace-plot-task.c
+++ b/trace-plot-task.c
@@ -55,7 +55,9 @@ static gint hash_pid(gint val)
 
 static int hash_cpu(int cpu)
 {
-        return trace_hash(cpu + 124);
+        cpu = (cpu << 3) + cpu * 21;
+ 
+        return trace_hash(cpu);
 }
 
 static gboolean is_running(struct graph_info *ginfo, struct record *record)