From 6732b86f752ee0d072710341fe3e57f0d53904b3 Mon Sep 17 00:00:00 2001
From: Tim Buckley <timothy.jas.buckley@hp.com>
Date: Wed, 19 Aug 2015 16:04:55 -0600
Subject: [PATCH] Hide dstat lanes if no loaded dstat data overlaps with test
 entries

---
 stackviz/static/js/timeline.js | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/stackviz/static/js/timeline.js b/stackviz/static/js/timeline.js
index d123816..46f2376 100644
--- a/stackviz/static/js/timeline.js
+++ b/stackviz/static/js/timeline.js
@@ -169,11 +169,22 @@ var initTimeline = function(options, data, timeExtents) {
   var width = container.width() - margin.left - margin.right;
   var height = 550 - margin.top - margin.bottom;
 
-  var dstatLanes = getDstatLanes(
-    options.dstatData,
-    options.dstatMinimums,
-    options.dstatMaximums);
-  var lanes = data.length + dstatLanes.length;
+  // filter dstat data immediately. if no timestamps overlap, we want to throw
+  // it away quickly
+  options.dstatData = options.dstatData.slice(
+    binaryMinIndex(timeExtents[0], options.dstatData, function(d) { return d.system_time; }),
+    binaryMaxIndex(timeExtents[1], options.dstatData, function(d) { return d.system_time; })
+  );
+
+  var dstatLanes;
+  if (options.dstatData.length > 2) {
+    dstatLanes = getDstatLanes(
+      options.dstatData,
+      options.dstatMinimums,
+      options.dstatMaximums);
+  } else {
+    dstatLanes = [];
+  }
 
   var miniHeight = data.length * 12 + 30;
   var dstatHeight = dstatLanes.length * 30 + 30;