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authorKuan-Wei Chiu <visitorckw@gmail.com>2024-05-02 11:24:42 +0200
committerYury Norov <yury.norov@gmail.com>2024-05-09 18:25:08 +0200
commit0a2c6664e56f0dff7535c3d3d9a6174279e18acc (patch)
tree6349481a13947ca35841cd3a75fcda2326a723f8 /lib
parentCompiler Attributes: Add __always_used macro (diff)
downloadlinux-0a2c6664e56f0dff7535c3d3d9a6174279e18acc.tar.xz
linux-0a2c6664e56f0dff7535c3d3d9a6174279e18acc.zip
lib/test_bitops: Add benchmark test for fns()
Introduce a benchmark test for the fns(). It measures the total time taken by fns() to process 10,000 test data generated using get_random_bytes() for each n in the range [0, BITS_PER_LONG). example: test_bitops: fns: 7637268 ns CC: Andrew Morton <akpm@linux-foundation.org> CC: Rasmus Villemoes <linux@rasmusvillemoes.dk> CC: David Laight <David.Laight@aculab.com> Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com> Suggested-by: Yury Norov <yury.norov@gmail.com> Signed-off-by: Yury Norov <yury.norov@gmail.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/test_bitops.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/test_bitops.c b/lib/test_bitops.c
index 3b7bcbee84db..55669624bb28 100644
--- a/lib/test_bitops.c
+++ b/lib/test_bitops.c
@@ -5,9 +5,11 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/cleanup.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/printk.h>
+#include <linux/slab.h>
/* a tiny module only meant to test
*
@@ -50,6 +52,30 @@ static unsigned long order_comb_long[][2] = {
};
#endif
+static int __init test_fns(void)
+{
+ static volatile __always_used unsigned long tmp __initdata;
+ unsigned long *buf __free(kfree) = NULL;
+ unsigned int i, n;
+ ktime_t time;
+
+ buf = kmalloc_array(10000, sizeof(unsigned long), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ get_random_bytes(buf, 10000 * sizeof(unsigned long));
+ time = ktime_get();
+
+ for (n = 0; n < BITS_PER_LONG; n++)
+ for (i = 0; i < 10000; i++)
+ tmp = fns(buf[i], n);
+
+ time = ktime_get() - time;
+ pr_err("fns: %18llu ns\n", time);
+
+ return 0;
+}
+
static int __init test_bitops_startup(void)
{
int i, bit_set;
@@ -94,6 +120,8 @@ static int __init test_bitops_startup(void)
if (bit_set != BITOPS_LAST)
pr_err("ERROR: FOUND SET BIT %d\n", bit_set);
+ test_fns();
+
pr_info("Completed bitops test\n");
return 0;