linux-kernel - Re: [PATCH] kunit: Make default kunit_test timeout configurable via both a module parameter and a Kconfig option

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Message-ID: <CABVgOSkEykW6dKPnWXUDC+QaGk0YA2K+ZjhT-Hiti_6y2OY4wA@mail.gmail.com>
Date: Fri, 27 Jun 2025 01:42:10 +0800
From: David Gow <davidgow@...gle.com>
To: Marie Zhussupova <marievic@...gle.com>
Cc: rmoar@...gle.com, shuah@...nel.org, geert@...ux-m68k.org, 
	linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kunit: Make default kunit_test timeout configurable via
 both a module parameter and a Kconfig option

On Fri, 27 Jun 2025 at 01:17, Marie Zhussupova <marievic@...gle.com> wrote:
>
> To accommodate varying hardware performance and use cases,
> the default kunit test case timeout (currently 300 seconds)
> is now configurable. Users can adjust the timeout by
> either setting the 'timeout' module parameter or the
> KUNIT_DEFAULT_TIMEOUT Kconfig option to their desired
> timeout in seconds.
>
> Signed-off-by: Marie Zhussupova <marievic@...gle.com>
> ---

Thanks very much. This works well here!

Reviewed-by: David Gow <davidgow@...gle.com>

Cheers,
-- David

>
>  lib/kunit/Kconfig | 13 +++++++++++++
>  lib/kunit/test.c  | 15 ++++++++-------
>  2 files changed, 21 insertions(+), 7 deletions(-)
>
> diff --git a/lib/kunit/Kconfig b/lib/kunit/Kconfig
> index a97897edd964..c10ede4b1d22 100644
> --- a/lib/kunit/Kconfig
> +++ b/lib/kunit/Kconfig
> @@ -93,4 +93,17 @@ config KUNIT_AUTORUN_ENABLED
>           In most cases this should be left as Y. Only if additional opt-in
>           behavior is needed should this be set to N.
>
> +config KUNIT_DEFAULT_TIMEOUT
> +       int "Default value of the timeout module parameter"
> +       default 300
> +       help
> +         Sets the default timeout, in seconds, for Kunit test cases. This value
> +         is further multiplied by a factor determined by the assigned speed
> +         setting: 1x for `DEFAULT`, 3x for `KUNIT_SPEED_SLOW`, and 12x for
> +         `KUNIT_SPEED_VERY_SLOW`. This allows slower tests on slower machines
> +         sufficient time to complete.
> +
> +         If unsure, the default timeout of 300 seconds is suitable for most
> +         cases.
> +
>  endif # KUNIT
> diff --git a/lib/kunit/test.c b/lib/kunit/test.c
> index 002121675605..f3c6b11f12b8 100644
> --- a/lib/kunit/test.c
> +++ b/lib/kunit/test.c
> @@ -69,6 +69,13 @@ static bool enable_param;
>  module_param_named(enable, enable_param, bool, 0);
>  MODULE_PARM_DESC(enable, "Enable KUnit tests");
>
> +/*
> + * Configure the base timeout.
> + */
> +static unsigned long kunit_base_timeout = CONFIG_KUNIT_DEFAULT_TIMEOUT;
> +module_param_named(timeout, kunit_base_timeout, ulong, 0644);
> +MODULE_PARM_DESC(timeout, "Set the base timeout for Kunit test cases");
> +
>  /*
>   * KUnit statistic mode:
>   * 0 - disabled
> @@ -393,12 +400,6 @@ static int kunit_timeout_mult(enum kunit_speed speed)
>  static unsigned long kunit_test_timeout(struct kunit_suite *suite, struct kunit_case *test_case)
>  {
>         int mult = 1;
> -       /*
> -        * TODO: Make the default (base) timeout configurable, so that users with
> -        * particularly slow or fast machines can successfully run tests, while
> -        * still taking advantage of the relative speed.
> -        */
> -       unsigned long default_timeout = 300;
>
>         /*
>          * The default test timeout is 300 seconds and will be adjusted by mult
> @@ -409,7 +410,7 @@ static unsigned long kunit_test_timeout(struct kunit_suite *suite, struct kunit_
>                 mult = kunit_timeout_mult(suite->attr.speed);
>         if (test_case->attr.speed != KUNIT_SPEED_UNSET)
>                 mult = kunit_timeout_mult(test_case->attr.speed);
> -       return mult * default_timeout * msecs_to_jiffies(MSEC_PER_SEC);
> +       return mult * kunit_base_timeout * msecs_to_jiffies(MSEC_PER_SEC);
>  }
>
>
> --
> 2.50.0.rc2.761.g2dc52ea45b-goog
>

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