linux-kernel - [PATCH v6 2/3] lib: Make the ratelimit test more reliable

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Message-Id: <20250709180335.1716384-2-paulmck@kernel.org>
Date: Wed,  9 Jul 2025 11:03:34 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Kuniyuki Iwashima <kuniyu@...zon.com>,
	Mateusz Guzik <mjguzik@...il.com>,
	Petr Mladek <pmladek@...e.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	John Ogness <john.ogness@...utronix.de>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Jon Pan-Doh <pandoh@...gle.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Karolina Stolarek <karolina.stolarek@...cle.com>,
	"Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH v6 2/3] lib: Make the ratelimit test more reliable

From: Petr Mladek <pmladek@...e.com>

The selftest fails most of the times when running in qemu with
a kernel configured with CONFIG_HZ = 250:

>  test_ratelimit_smoke: 1 callbacks suppressed
>  # test_ratelimit_smoke: ASSERTION FAILED at lib/tests/test_ratelimit.c:28
>                    Expected ___ratelimit(&testrl, "test_ratelimit_smoke") == (false), but
>                        ___ratelimit(&testrl, "test_ratelimit_smoke") == 1 (0x1)
>                        (false) == 0 (0x0)

Try to make the test slightly more reliable by calling the problematic
ratelimit in the middle of the interval.

Signed-off-by: Petr Mladek <pmladek@...e.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 lib/tests/test_ratelimit.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/tests/test_ratelimit.c b/lib/tests/test_ratelimit.c
index 0374107f5ea89..5d6ec88546005 100644
--- a/lib/tests/test_ratelimit.c
+++ b/lib/tests/test_ratelimit.c
@@ -24,19 +24,19 @@ static void test_ratelimit_smoke(struct kunit *test)
 	test_ratelimited(test, true);
 	test_ratelimited(test, false);
 
-	schedule_timeout_idle(TESTRL_INTERVAL - 40);
+	schedule_timeout_idle(TESTRL_INTERVAL / 2);
 	test_ratelimited(test, false);
 
-	schedule_timeout_idle(50);
+	schedule_timeout_idle(TESTRL_INTERVAL * 3 / 4);
 	test_ratelimited(test, true);
 
 	schedule_timeout_idle(2 * TESTRL_INTERVAL);
 	test_ratelimited(test, true);
 	test_ratelimited(test, true);
 
-	schedule_timeout_idle(TESTRL_INTERVAL - 40);
+	schedule_timeout_idle(TESTRL_INTERVAL / 2 );
 	test_ratelimited(test, true);
-	schedule_timeout_idle(50);
+	schedule_timeout_idle(TESTRL_INTERVAL * 3 / 4);
 	test_ratelimited(test, true);
 	test_ratelimited(test, true);
 	test_ratelimited(test, true);
-- 
2.40.1