linux-kernel - [PATCH 4/4] lib/interval_tree

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Date:   Thu, 18 May 2017 10:49:36 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     akpm@...ux-foundation.org
Cc:     dave@...olabs.net, linux-kernel@...r.kernel.org,
        Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 4/4] lib/interval_tree_test: allow full tree search

... such that a user can specify visiting all the nodes
in the tree (intersects with the world). This is a nice
opposite from the very basic default query which is a
single point.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 lib/interval_tree_test.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/lib/interval_tree_test.c b/lib/interval_tree_test.c
index 0fef6364a958..df495fe81421 100644
--- a/lib/interval_tree_test.c
+++ b/lib/interval_tree_test.c
@@ -15,6 +15,7 @@ __param(int, perf_loops, 100000, "Number of iterations modifying the tree");
 
 __param(int, nsearches, 100, "Number of searches to the interval tree");
 __param(int, search_loops, 10000, "Number of iterations searching the tree");
+__param(bool, search_all, false, "Searches will iterate all nodes in the tree");
 
 __param(uint, max_endpoint, ~0, "Largest value for the interval's endpoint");
 
@@ -25,13 +26,13 @@ static u32 *queries = NULL;
 static struct rnd_state rnd;
 
 static inline unsigned long
-search(unsigned long query, struct rb_root *root)
+search(struct rb_root *root, unsigned long start, unsigned long last)
 {
 	struct interval_tree_node *node;
 	unsigned long results = 0;
 
-	for (node = interval_tree_iter_first(root, query, query); node;
-	     node = interval_tree_iter_next(node, query, query))
+	for (node = interval_tree_iter_first(root, start, last); node;
+	     node = interval_tree_iter_next(node, start, last))
 		results++;
 	return results;
 }
@@ -102,8 +103,12 @@ static int interval_tree_test_init(void)
 
 	results = 0;
 	for (i = 0; i < search_loops; i++)
-		for (j = 0; j < nsearches; j++)
-			results += search(queries[j], &root);
+		for (j = 0; j < nsearches; j++) {
+			unsigned long start = search_all ? 0 : queries[j];
+			unsigned long last = search_all ? max_endpoint : queries[j];
+
+			results += search(&root, start, last);
+		}
 
 	time2 = get_cycles();
 	time = time2 - time1;
-- 
2.12.0