linux-kernel - [PATCH 05/17] lib/rbtree_test.c: add (inorder) traversal test

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Date:   Tue, 18 Jul 2017 18:45:51 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     akpm@...ux-foundation.org
Cc:     mingo@...nel.org, peterz@...radead.org, jack@...e.cz,
        torvalds@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
        hch@...radead.org, ldufour@...ux.vnet.ibm.com, mhocko@...e.com,
        mgorman@...hsingularity.net, dave@...olabs.net,
        linux-kernel@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 05/17] lib/rbtree_test.c: add (inorder) traversal test

This adds a second test for regular rb-tree testing in
that there is no need to repeat it for the augmented
flavor.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 lib/rbtree_test.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/lib/rbtree_test.c b/lib/rbtree_test.c
index e83331aa1b7f..967999ff46db 100644
--- a/lib/rbtree_test.c
+++ b/lib/rbtree_test.c
@@ -183,6 +183,7 @@ static int __init rbtree_test_init(void)
 {
 	int i, j;
 	cycles_t time1, time2, time;
+	struct rb_node *node;
 
 	nodes = kmalloc(nnodes * sizeof(*nodes), GFP_KERNEL);
 	if (!nodes)
@@ -206,8 +207,28 @@ static int __init rbtree_test_init(void)
 	time = time2 - time1;
 
 	time = div_u64(time, perf_loops);
-	printk(" -> %llu cycles\n", (unsigned long long)time);
+	printk(" -> test 1 (latency of nnodes insert+delete): %llu cycles\n", (unsigned long long)time);
 
+	for (i = 0; i < nnodes; i++)
+		insert(nodes + i, &root);
+
+	time1 = get_cycles();
+
+	for (i = 0; i < perf_loops; i++) {
+		for (node = rb_first(&root); node; node = rb_next(node))
+			;
+	}
+
+	time2 = get_cycles();
+	time = time2 - time1;
+
+	time = div_u64(time, perf_loops);
+	printk(" -> test 2 (latency of inorder traversal): %llu cycles\n", (unsigned long long)time);
+
+	for (i = 0; i < nnodes; i++)
+		erase(nodes + i, &root);
+
+	/* run checks */
 	for (i = 0; i < check_loops; i++) {
 		init();
 		for (j = 0; j < nnodes; j++) {
@@ -238,7 +259,7 @@ static int __init rbtree_test_init(void)
 	time = time2 - time1;
 
 	time = div_u64(time, perf_loops);
-	printk(" -> %llu cycles\n", (unsigned long long)time);
+	printk(" -> test 1 (latency of nnodes insert+delete): %llu cycles\n", (unsigned long long)time);
 
 	for (i = 0; i < check_loops; i++) {
 		init();
-- 
2.12.0