diff options
Diffstat (limited to 'lib/find_bit_benchmark.c')
| -rw-r--r-- | lib/find_bit_benchmark.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/lib/find_bit_benchmark.c b/lib/find_bit_benchmark.c index 67b19233c28f..5985a25e6cbc 100644 --- a/lib/find_bit_benchmark.c +++ b/lib/find_bit_benchmark.c @@ -35,6 +35,7 @@ #define SPARSE 500 static DECLARE_BITMAP(bitmap, BITMAP_LEN) __initdata; +static DECLARE_BITMAP(bitmap2, BITMAP_LEN) __initdata; /* * This is Schlemiel the Painter's algorithm. It should be called after @@ -103,6 +104,22 @@ static int __init test_find_last_bit(const void *bitmap, unsigned long len) return 0; } +static int __init test_find_next_and_bit(const void *bitmap, + const void *bitmap2, unsigned long len) +{ + unsigned long i, cnt; + cycles_t cycles; + + cycles = get_cycles(); + for (cnt = i = 0; i < BITMAP_LEN; cnt++) + i = find_next_and_bit(bitmap, bitmap2, BITMAP_LEN, i+1); + cycles = get_cycles() - cycles; + pr_err("find_next_and_bit:\t\t%llu cycles, %ld iterations\n", + (u64)cycles, cnt); + + return 0; +} + static int __init find_bit_test(void) { unsigned long nbits = BITMAP_LEN / SPARSE; @@ -110,23 +127,29 @@ static int __init find_bit_test(void) pr_err("\nStart testing find_bit() with random-filled bitmap\n"); get_random_bytes(bitmap, sizeof(bitmap)); + get_random_bytes(bitmap2, sizeof(bitmap2)); test_find_next_bit(bitmap, BITMAP_LEN); test_find_next_zero_bit(bitmap, BITMAP_LEN); test_find_last_bit(bitmap, BITMAP_LEN); test_find_first_bit(bitmap, BITMAP_LEN); + test_find_next_and_bit(bitmap, bitmap2, BITMAP_LEN); pr_err("\nStart testing find_bit() with sparse bitmap\n"); bitmap_zero(bitmap, BITMAP_LEN); + bitmap_zero(bitmap2, BITMAP_LEN); - while (nbits--) + while (nbits--) { __set_bit(prandom_u32() % BITMAP_LEN, bitmap); + __set_bit(prandom_u32() % BITMAP_LEN, bitmap2); + } test_find_next_bit(bitmap, BITMAP_LEN); test_find_next_zero_bit(bitmap, BITMAP_LEN); test_find_last_bit(bitmap, BITMAP_LEN); test_find_first_bit(bitmap, BITMAP_LEN); + test_find_next_and_bit(bitmap, bitmap2, BITMAP_LEN); /* * Everything is OK. Return error just to let user run benchmark |