If unsure, say N.
-config TEST_FIND_BIT
+config FIND_BIT_BENCHMARK
tristate "Test find_bit functions"
default n
help
obj-y += hexdump.o
obj-$(CONFIG_TEST_HEXDUMP) += test_hexdump.o
obj-y += kstrtox.o
+obj-$(CONFIG_FIND_BIT_BENCHMARK) += find_bit_benchmark.o
obj-$(CONFIG_TEST_BPF) += test_bpf.o
-obj-$(CONFIG_TEST_FIND_BIT) += test_find_bit.o
obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o
obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o
obj-$(CONFIG_TEST_HASH) += test_hash.o test_siphash.o
--- /dev/null
+/*
+ * Test for find_*_bit functions.
+ *
+ * Copyright (c) 2017 Cavium.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+/*
+ * find_bit functions are widely used in kernel, so the successful boot
+ * is good enough test for correctness.
+ *
+ * This test is focused on performance of traversing bitmaps. Two typical
+ * scenarios are reproduced:
+ * - randomly filled bitmap with approximately equal number of set and
+ * cleared bits;
+ * - sparse bitmap with few set bits at random positions.
+ */
+
+#include <linux/bitops.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/random.h>
+
+#define BITMAP_LEN (4096UL * 8 * 10)
+#define SPARSE 500
+
+static DECLARE_BITMAP(bitmap, BITMAP_LEN) __initdata;
+
+/*
+ * This is Schlemiel the Painter's algorithm. It should be called after
+ * all other tests for the same bitmap because it sets all bits of bitmap to 1.
+ */
+static int __init test_find_first_bit(void *bitmap, unsigned long len)
+{
+ unsigned long i, cnt;
+ cycles_t cycles;
+
+ cycles = get_cycles();
+ for (cnt = i = 0; i < len; cnt++) {
+ i = find_first_bit(bitmap, len);
+ __clear_bit(i, bitmap);
+ }
+ cycles = get_cycles() - cycles;
+ pr_err("find_first_bit:\t\t%llu cycles,\t%ld iterations\n",
+ (u64)cycles, cnt);
+
+ return 0;
+}
+
+static int __init test_find_next_bit(const void *bitmap, unsigned long len)
+{
+ unsigned long i, cnt;
+ cycles_t cycles;
+
+ cycles = get_cycles();
+ for (cnt = i = 0; i < BITMAP_LEN; cnt++)
+ i = find_next_bit(bitmap, BITMAP_LEN, i) + 1;
+ cycles = get_cycles() - cycles;
+ pr_err("find_next_bit:\t\t%llu cycles,\t%ld iterations\n",
+ (u64)cycles, cnt);
+
+ return 0;
+}
+
+static int __init test_find_next_zero_bit(const void *bitmap, unsigned long len)
+{
+ unsigned long i, cnt;
+ cycles_t cycles;
+
+ cycles = get_cycles();
+ for (cnt = i = 0; i < BITMAP_LEN; cnt++)
+ i = find_next_zero_bit(bitmap, len, i) + 1;
+ cycles = get_cycles() - cycles;
+ pr_err("find_next_zero_bit:\t%llu cycles,\t%ld iterations\n",
+ (u64)cycles, cnt);
+
+ return 0;
+}
+
+static int __init test_find_last_bit(const void *bitmap, unsigned long len)
+{
+ unsigned long l, cnt = 0;
+ cycles_t cycles;
+
+ cycles = get_cycles();
+ do {
+ cnt++;
+ l = find_last_bit(bitmap, len);
+ if (l >= len)
+ break;
+ len = l;
+ } while (len);
+ cycles = get_cycles() - cycles;
+ pr_err("find_last_bit:\t\t%llu cycles,\t%ld iterations\n",
+ (u64)cycles, cnt);
+
+ return 0;
+}
+
+static int __init find_bit_test(void)
+{
+ unsigned long nbits = BITMAP_LEN / SPARSE;
+
+ pr_err("\nStart testing find_bit() with random-filled bitmap\n");
+
+ get_random_bytes(bitmap, sizeof(bitmap));
+
+ 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);
+
+ pr_err("\nStart testing find_bit() with sparse bitmap\n");
+
+ bitmap_zero(bitmap, BITMAP_LEN);
+
+ while (nbits--)
+ __set_bit(prandom_u32() % BITMAP_LEN, bitmap);
+
+ 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);
+
+ return 0;
+}
+module_init(find_bit_test);
+
+static void __exit test_find_bit_cleanup(void)
+{
+}
+module_exit(test_find_bit_cleanup);
+
+MODULE_LICENSE("GPL");
+++ /dev/null
-/*
- * Test for find_*_bit functions.
- *
- * Copyright (c) 2017 Cavium.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- */
-
-/*
- * find_bit functions are widely used in kernel, so the successful boot
- * is good enough test for correctness.
- *
- * This test is focused on performance of traversing bitmaps. Two typical
- * scenarios are reproduced:
- * - randomly filled bitmap with approximately equal number of set and
- * cleared bits;
- * - sparse bitmap with few set bits at random positions.
- */
-
-#include <linux/bitops.h>
-#include <linux/kernel.h>
-#include <linux/list.h>
-#include <linux/module.h>
-#include <linux/printk.h>
-#include <linux/random.h>
-
-#define BITMAP_LEN (4096UL * 8 * 10)
-#define SPARSE 500
-
-static DECLARE_BITMAP(bitmap, BITMAP_LEN) __initdata;
-
-/*
- * This is Schlemiel the Painter's algorithm. It should be called after
- * all other tests for the same bitmap because it sets all bits of bitmap to 1.
- */
-static int __init test_find_first_bit(void *bitmap, unsigned long len)
-{
- unsigned long i, cnt;
- cycles_t cycles;
-
- cycles = get_cycles();
- for (cnt = i = 0; i < len; cnt++) {
- i = find_first_bit(bitmap, len);
- __clear_bit(i, bitmap);
- }
- cycles = get_cycles() - cycles;
- pr_err("find_first_bit:\t\t%llu cycles,\t%ld iterations\n",
- (u64)cycles, cnt);
-
- return 0;
-}
-
-static int __init test_find_next_bit(const void *bitmap, unsigned long len)
-{
- unsigned long i, cnt;
- cycles_t cycles;
-
- cycles = get_cycles();
- for (cnt = i = 0; i < BITMAP_LEN; cnt++)
- i = find_next_bit(bitmap, BITMAP_LEN, i) + 1;
- cycles = get_cycles() - cycles;
- pr_err("find_next_bit:\t\t%llu cycles,\t%ld iterations\n",
- (u64)cycles, cnt);
-
- return 0;
-}
-
-static int __init test_find_next_zero_bit(const void *bitmap, unsigned long len)
-{
- unsigned long i, cnt;
- cycles_t cycles;
-
- cycles = get_cycles();
- for (cnt = i = 0; i < BITMAP_LEN; cnt++)
- i = find_next_zero_bit(bitmap, len, i) + 1;
- cycles = get_cycles() - cycles;
- pr_err("find_next_zero_bit:\t%llu cycles,\t%ld iterations\n",
- (u64)cycles, cnt);
-
- return 0;
-}
-
-static int __init test_find_last_bit(const void *bitmap, unsigned long len)
-{
- unsigned long l, cnt = 0;
- cycles_t cycles;
-
- cycles = get_cycles();
- do {
- cnt++;
- l = find_last_bit(bitmap, len);
- if (l >= len)
- break;
- len = l;
- } while (len);
- cycles = get_cycles() - cycles;
- pr_err("find_last_bit:\t\t%llu cycles,\t%ld iterations\n",
- (u64)cycles, cnt);
-
- return 0;
-}
-
-static int __init find_bit_test(void)
-{
- unsigned long nbits = BITMAP_LEN / SPARSE;
-
- pr_err("\nStart testing find_bit() with random-filled bitmap\n");
-
- get_random_bytes(bitmap, sizeof(bitmap));
-
- 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);
-
- pr_err("\nStart testing find_bit() with sparse bitmap\n");
-
- bitmap_zero(bitmap, BITMAP_LEN);
-
- while (nbits--)
- __set_bit(prandom_u32() % BITMAP_LEN, bitmap);
-
- 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);
-
- return 0;
-}
-module_init(find_bit_test);
-
-static void __exit test_find_bit_cleanup(void)
-{
-}
-module_exit(test_find_bit_cleanup);
-
-MODULE_LICENSE("GPL");
projects / linux-2.6-microblaze.git / commitdiff