[PATCH v2 6/8] kernel-shark-qt: Add tot_count field to the model descriptor

[Yordan Karadzhov <ykaradzhov@vmware.com>]

The tot_count field of the Visualization model descriptor provides
fast access to the total number of entries being currently visualized.
The total count can be useful in various cases. For example the sched
event plugin can use it for knowing when to plot wakeup latency.

Signed-off-by: Yordan Karadzhov <ykaradzhov@vmware.com>
---
 kernel-shark-qt/src/libkshark-model.c | 7 +++++++
 kernel-shark-qt/src/libkshark-model.h | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/kernel-shark-qt/src/libkshark-model.c b/kernel-shark-qt/src/libkshark-model.c
index ef6ad48..461f88e 100644
--- a/kernel-shark-qt/src/libkshark-model.c
+++ b/kernel-shark-qt/src/libkshark-model.c
@@ -298,6 +298,7 @@ static void ksmodel_set_bin_counts(struct kshark_trace_histo *histo)
 {
 	int i = 0, prev_not_empty;
 
+	histo->tot_count = 0;
 	memset(&histo->bin_count[0], 0,
 	       (histo->n_bins) * sizeof(histo->bin_count[0]));
 	/*
@@ -329,6 +330,10 @@ static void ksmodel_set_bin_counts(struct kshark_trace_histo *histo)
 			histo->bin_count[prev_not_empty] =
 				histo->map[i] - histo->map[prev_not_empty];
 
+			if (prev_not_empty != LOB(histo))
+				histo->tot_count +=
+					histo->bin_count[prev_not_empty];
+
 			prev_not_empty = i;
 		}
 	}
@@ -350,6 +355,8 @@ static void ksmodel_set_bin_counts(struct kshark_trace_histo *histo)
 		histo->bin_count[prev_not_empty] = histo->map[UOB(histo)] -
 						   histo->map[prev_not_empty];
 	}
+
+	histo->tot_count += histo->bin_count[prev_not_empty];
 }
 
 /**
diff --git a/kernel-shark-qt/src/libkshark-model.h b/kernel-shark-qt/src/libkshark-model.h
index db681cc..95c30b6 100644
--- a/kernel-shark-qt/src/libkshark-model.h
+++ b/kernel-shark-qt/src/libkshark-model.h
@@ -51,6 +51,9 @@ struct kshark_trace_histo {
 	/** Number of entries in each bin. */
 	size_t			*bin_count;
 
+	/** Total number of entries in all bin except the overflow bins. */
+	int			tot_count;
+
 	/**
 	 * Lower edge of the time-window to be visualized. Only entries having
 	 * timestamp >= min will be visualized.
-- 
2.17.1