lib/interval_tree_test.c: make test options module parameters

Allows for more flexible debugging.

Link: http://lkml.kernel.org/r/20170518174936.20265-3-dave@stgolabs.net
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 40 insertions, 17 deletions

diff --git a/lib/interval_tree_test.c b/lib/interval_tree_test.c
index 245900b98c8e..1093f0496d5e 100644
--- a/lib/interval_tree_test.c
+++ b/lib/interval_tree_test.c
@@ -1,16 +1,25 @@
 #include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/interval_tree.h>
 #include <linux/random.h>
+#include <linux/slab.h>
 #include <asm/timex.h>
 
-#define NODES        100
-#define PERF_LOOPS   100000
-#define SEARCHES     100
-#define SEARCH_LOOPS 10000
+#define __param(type, name, init, msg)          \
+        static type name = init;                \
+        module_param(name, type, 0444);         \
+        MODULE_PARM_DESC(name, msg);
+
+__param(int, nnodes, 100, "Number of nodes in the interval tree");
+__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");
+
 
 static struct rb_root root = RB_ROOT;
-static struct interval_tree_node nodes[NODES];
-static u32 queries[SEARCHES];
+static struct interval_tree_node *nodes = NULL;
+static u32 *queries = NULL;
 
 static struct rnd_state rnd;
 
@@ -29,7 +38,8 @@ search(unsigned long query, struct rb_root *root)
 static void init(void)
 {
         int i;
-        for (i = 0; i < NODES; i++) {
+
+        for (i = 0; i < nnodes; i++) {
                 u32 a = prandom_u32_state(&rnd);
                 u32 b = prandom_u32_state(&rnd);
                 if (a <= b) {
@@ -40,7 +50,7 @@ static void init(void)
                         nodes[i].last = a;
                 }
         }
-        for (i = 0; i < SEARCHES; i++)
+        for (i = 0; i < nsearches; i++)
                 queries[i] = prandom_u32_state(&rnd);
 }
 
@@ -50,6 +60,16 @@ static int interval_tree_test_init(void)
         unsigned long results;
         cycles_t time1, time2, time;
 
+        nodes = kmalloc(nnodes * sizeof(struct interval_tree_node), GFP_KERNEL);
+        if (!nodes)
+                return -ENOMEM;
+
+        queries = kmalloc(nsearches * sizeof(int), GFP_KERNEL);
+        if (!queries) {
+                kfree(nodes);
+                return -ENOMEM;
+        }
+
         printk(KERN_ALERT "interval tree insert/remove");
 
         prandom_seed_state(&rnd, 3141592653589793238ULL);
@@ -57,39 +77,42 @@ static int interval_tree_test_init(void)
 
         time1 = get_cycles();
 
-        for (i = 0; i < PERF_LOOPS; i++) {
-                for (j = 0; j < NODES; j++)
+        for (i = 0; i < perf_loops; i++) {
+                for (j = 0; j < nnodes; j++)
                         interval_tree_insert(nodes + j, &root);
-                for (j = 0; j < NODES; j++)
+                for (j = 0; j < nnodes; j++)
                         interval_tree_remove(nodes + j, &root);
         }
 
         time2 = get_cycles();
         time = time2 - time1;
 
-        time = div_u64(time, PERF_LOOPS);
+        time = div_u64(time, perf_loops);
         printk(" -> %llu cycles\n", (unsigned long long)time);
 
         printk(KERN_ALERT "interval tree search");
 
-        for (j = 0; j < NODES; j++)
+        for (j = 0; j < nnodes; j++)
                 interval_tree_insert(nodes + j, &root);
 
         time1 = get_cycles();
 
         results = 0;
-        for (i = 0; i < SEARCH_LOOPS; i++)
-                for (j = 0; j < SEARCHES; j++)
+        for (i = 0; i < search_loops; i++)
+                for (j = 0; j < nsearches; j++)
                         results += search(queries[j], &root);
 
         time2 = get_cycles();
         time = time2 - time1;
 
-        time = div_u64(time, SEARCH_LOOPS);
-        results = div_u64(results, SEARCH_LOOPS);
+        time = div_u64(time, search_loops);
+        results = div_u64(results, search_loops);
         printk(" -> %llu cycles (%lu results)\n",
                (unsigned long long)time, results);
 
+        kfree(queries);
+        kfree(nodes);
+
         return -EAGAIN; /* Fail will directly unload the module */
 }