linux-kernel - [PATCHv2 2/2] lib: kstrtox: add performance test case

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Date:	Mon, 18 Jul 2011 15:57:54 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: [PATCHv2 2/2] lib: kstrtox: add performance test case

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Alexey Dobriyan <adobriyan@...il.com>
---
 lib/test-kstrtox.c |   30 ++++++++++++++++++++++++++++++
 1 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/lib/test-kstrtox.c b/lib/test-kstrtox.c
index d55769d..2da5950 100644
--- a/lib/test-kstrtox.c
+++ b/lib/test-kstrtox.c
@@ -65,6 +65,12 @@ struct test_fail {
 	}								\
 }
 
+static int loop_amount;
+
+module_param(loop_amount, int, 0);
+MODULE_PARM_DESC(loop_amount,
+		 "Amount of loops for performance test (0 - no test)");
+
 static void __init test_kstrtoull_ok(void)
 {
 	DECLARE_TEST_OK(unsigned long long, struct test_ull);
@@ -707,6 +713,27 @@ static void __init test_kstrtos8_fail(void)
 	TEST_FAIL(kstrtos8, s8, "%hhd", test_s8_fail);
 }
 
+static void __init test_kstrtox_perf(void)
+{
+	struct timespec ts, ts1, ts2;
+	int count = loop_amount;
+
+	if (!loop_amount)
+		return;
+
+	getnstimeofday(&ts1);
+	while (count--) {
+		test_kstrtoull_ok();
+		test_kstrtoull_fail();
+	}
+	getnstimeofday(&ts2);
+	ts = timespec_sub(ts2, ts1);
+
+	printk(KERN_INFO "kstrox: %d conversions of strings took %lu.%09lu "
+			 "seconds\n", loop_amount,
+			 (unsigned long)ts.tv_sec, (unsigned long)ts.tv_nsec);
+}
+
 static int __init test_kstrtox_init(void)
 {
 	test_kstrtoull_ok();
@@ -733,6 +760,9 @@ static int __init test_kstrtox_init(void)
 	test_kstrtou8_fail();
 	test_kstrtos8_ok();
 	test_kstrtos8_fail();
+
+	test_kstrtox_perf();
+
 	return -EINVAL;
 }
 module_init(test_kstrtox_init);
-- 
1.7.5.4

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