lib/bitmap: add tests for find_nth_bit()

[linux-2.6-microblaze.git] / lib / find_bit_benchmark.c

diff --git a/lib/find_bit_benchmark.c b/lib/find_bit_benchmark.c
index db904b5..1075458 100644 (file)
--- a/lib/find_bit_benchmark.c
+++ b/lib/find_bit_benchmark.c
@@ -115,6 +115,22 @@ static int __init test_find_last_bit(const void *bitmap, unsigned long len)
        return 0;
 }
 
+static int __init test_find_nth_bit(const unsigned long *bitmap, unsigned long len)
+{
+       unsigned long l, n, w = bitmap_weight(bitmap, len);
+       ktime_t time;
+
+       time = ktime_get();
+       for (n = 0; n < w; n++) {
+               l = find_nth_bit(bitmap, len, n);
+               WARN_ON(l >= len);
+       }
+       time = ktime_get() - time;
+       pr_err("find_nth_bit:       %18llu ns, %6ld iterations\n", time, w);
+
+       return 0;
+}
+
 static int __init test_find_next_and_bit(const void *bitmap,
                const void *bitmap2, unsigned long len)
 {
@@ -142,6 +158,7 @@ static int __init find_bit_test(void)
        test_find_next_bit(bitmap, BITMAP_LEN);
        test_find_next_zero_bit(bitmap, BITMAP_LEN);
        test_find_last_bit(bitmap, BITMAP_LEN);
+       test_find_nth_bit(bitmap, BITMAP_LEN / 10);
 
        /*
         * test_find_first_bit() may take some time, so
@@ -164,6 +181,7 @@ static int __init find_bit_test(void)
        test_find_next_bit(bitmap, BITMAP_LEN);
        test_find_next_zero_bit(bitmap, BITMAP_LEN);
        test_find_last_bit(bitmap, BITMAP_LEN);
+       test_find_nth_bit(bitmap, BITMAP_LEN);
        test_find_first_bit(bitmap, BITMAP_LEN);
        test_find_first_and_bit(bitmap, bitmap2, BITMAP_LEN);
        test_find_next_and_bit(bitmap, bitmap2, BITMAP_LEN);