[PATCH 1/2] kernel-shark-qt: Add a method for adding a new collection to a list

[Yordan Karadzhov <ykaradzhov@vmware.com>]

So far we have only one method that creates a new Data Collection.
It is kshark_register_data_collection(). The problem with this method
is that it automatically adds the new collection to the list of
collections, owned by the context of the session. This patch adds
a more generic method, which can be used to add new data collection
to a given list. The method will be used by the Sched event plugin,
which will keep its own list of collections, relevant only for the
plugin.

Signed-off-by: Yordan Karadzhov <ykaradzhov@vmware.com>
---
 kernel-shark-qt/src/libkshark-collection.c | 45 +++++++++++++++++++++-
 kernel-shark-qt/src/libkshark.c            |  1 +
 kernel-shark-qt/src/libkshark.h            |  9 +++++
 3 files changed, 53 insertions(+), 2 deletions(-)

diff --git a/kernel-shark-qt/src/libkshark-collection.c b/kernel-shark-qt/src/libkshark-collection.c
index 9838042..c70da1e 100644
--- a/kernel-shark-qt/src/libkshark-collection.c
+++ b/kernel-shark-qt/src/libkshark-collection.c
@@ -781,14 +781,55 @@ kshark_register_data_collection(struct kshark_context *kshark_ctx,
 {
 	struct kshark_entry_collection *col;
 
+	col = kshark_add_collection_to_list(kshark_ctx,
+					    &kshark_ctx->collections,
+					    data, n_rows,
+					    cond, val,
+					    margin);
+
+	return col;
+}
+
+/**
+ * @brief Allocate and process data collection, defined with a given Matching
+ *	  condition function and value. Add this collection to a given list of
+ *	  collections.
+ *
+ * @param kshark_ctx: Input location for the session context pointer.
+ * @param col_list: Input location for the list of collections.
+ * @param data: Input location for the trace data.
+ * @param n_rows: The size of the inputted data.
+ * @param cond: Matching condition function for the collection to be
+ *	        registered.
+ * @param val: Matching condition value of for collection to be registered.
+ * @param margin: The size of the additional (margin) data which do not
+ *		  satisfy the matching condition, but is added at the
+ *		  beginning and at the end of each interval of the collection
+ *		  as well as at the beginning and at the end of data-set. If
+ *		  "0", no margin data is added.
+ *
+ * @returns Pointer to the registered Data collections on success, or NULL
+ *	    on failure.
+ */
+struct kshark_entry_collection *
+kshark_add_collection_to_list(struct kshark_context *kshark_ctx,
+			      struct kshark_entry_collection **col_list,
+			      struct kshark_entry **data,
+			      size_t n_rows,
+			      matching_condition_func cond,
+			      int val,
+			      size_t margin)
+{
+	struct kshark_entry_collection *col;
+
 	col = kshark_data_collection_alloc(kshark_ctx, data,
 					   0, n_rows,
 					   cond, val,
 					   margin);
 
 	if (col) {
-		col->next = kshark_ctx->collections;
-		kshark_ctx->collections = col;
+		col->next = *col_list;
+		*col_list = col;
 	}
 
 	return col;
diff --git a/kernel-shark-qt/src/libkshark.c b/kernel-shark-qt/src/libkshark.c
index 86d3e58..598ea52 100644
--- a/kernel-shark-qt/src/libkshark.c
+++ b/kernel-shark-qt/src/libkshark.c
@@ -33,6 +33,7 @@ static bool kshark_default_context(struct kshark_context **context)
 		return false;
 
 	kshark_ctx->event_handlers = NULL;
+	kshark_ctx->collections = NULL;
 	kshark_ctx->plugins = NULL;
 
 	kshark_ctx->show_task_filter = tracecmd_filter_id_hash_alloc();
diff --git a/kernel-shark-qt/src/libkshark.h b/kernel-shark-qt/src/libkshark.h
index b3bd646..7d1edfc 100644
--- a/kernel-shark-qt/src/libkshark.h
+++ b/kernel-shark-qt/src/libkshark.h
@@ -412,6 +412,15 @@ struct kshark_entry_collection {
 	size_t size;
 };
 
+struct kshark_entry_collection *
+kshark_add_collection_to_list(struct kshark_context *kshark_ctx,
+			      struct kshark_entry_collection **col_list,
+			      struct kshark_entry **data,
+			      size_t n_rows,
+			      matching_condition_func cond,
+			      int val,
+			      size_t margin);
+
 struct kshark_entry_collection *
 kshark_register_data_collection(struct kshark_context *kshark_ctx,
 				struct kshark_entry **data, size_t n_rows,
-- 
2.17.1