[PATCH 3/3] kernel-shark: Search for visible entry only if this is really needed

["Yordan Karadzhov (VMware)" <y.karadz@gmail.com>]

ksmodel_task_visible_event_exist() and ksmodel_cpu_visible_event_exist()
are relatively expensive operations. It make sense to perform those only
if the entry that was found so far has been filtered out (is invisible).
The patch also makes the processing of the CPU and Task graphs more
consistent.

Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
---
 kernel-shark/src/KsPlotTools.cpp | 42 ++++++++++++++++++++------------
 1 file changed, 27 insertions(+), 15 deletions(-)

diff --git a/kernel-shark/src/KsPlotTools.cpp b/kernel-shark/src/KsPlotTools.cpp
index a8eddcd..fe3008e 100644
--- a/kernel-shark/src/KsPlotTools.cpp
+++ b/kernel-shark/src/KsPlotTools.cpp
@@ -829,14 +829,17 @@ void Graph::fillCPUGraph(int cpu)
 			pidBack = KS_FILTERED_BIN;
 
 		visMask = 0x0;
-		if (ksmodel_cpu_visible_event_exist(_histoPtr, bin,
-							       cpu,
-							       _collectionPtr,
-							       &index))
-
-			visMask = _histoPtr->data[index]->visible;
-		else if (eFront)
-			visMask = eFront->visible;
+		if (eFront) {
+			if (!(eFront->visible & KS_EVENT_VIEW_FILTER_MASK) &&
+			    ksmodel_cpu_visible_event_exist(_histoPtr, bin,
+								       cpu,
+								       _collectionPtr,
+								       &index)) {
+				visMask = _histoPtr->data[index]->visible;
+			} else {
+				visMask = eFront->visible;
+			}
+		}
 	};
 
 	auto lamSetBin = [&] (int bin)
@@ -918,6 +921,7 @@ void Graph::fillCPUGraph(int cpu)
 void Graph::fillTaskGraph(int pid)
 {
 	int cpuFront, cpuBack(0), pidFront(0), pidBack(0), lastCpu(-1), bin(0);
+	struct kshark_entry *eFront;
 	uint8_t visMask;
 	ssize_t index;
 
@@ -991,12 +995,15 @@ void Graph::fillTaskGraph(int pid)
 
 	auto lamGetPidCPU = [&] (int bin)
 	{
+		eFront = nullptr;
 		/* Get the CPU used by this task. */
 		cpuFront = ksmodel_get_cpu_front(_histoPtr, bin,
 						 pid,
 						 false,
 						 _collectionPtr,
-						 nullptr);
+						 &index);
+		if (index >= 0)
+			eFront = _histoPtr->data[index];
 
 		cpuBack = ksmodel_get_cpu_back(_histoPtr, bin,
 					       pid,
@@ -1026,12 +1033,17 @@ void Graph::fillTaskGraph(int pid)
 						       nullptr);
 
 			visMask = 0x0;
-			if (ksmodel_task_visible_event_exist(_histoPtr,
-							     bin,
-							     pid,
-							     _collectionPtr,
-							     &index)) {
-				visMask = _histoPtr->data[index]->visible;
+			if (eFront) {
+				if (!(eFront->visible & KS_EVENT_VIEW_FILTER_MASK) &&
+				    ksmodel_task_visible_event_exist(_histoPtr,
+								     bin,
+								     pid,
+								     _collectionPtr,
+								     &index)) {
+					visMask = _histoPtr->data[index]->visible;
+				} else {
+					visMask = eFront->visible;
+				}
 			}
 		}
 	};
-- 
2.20.1