linux-kernel - Re: [PATCH 1/2] kunit: tool: Add x86_64-smp architecture for SMP testing

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Message-ID: <YoS60c/CIK3mHWyq@elver.google.com>
Date:   Wed, 18 May 2022 11:22:25 +0200
From:   Marco Elver <elver@...gle.com>
To:     David Gow <davidgow@...gle.com>
Cc:     Brendan Higgins <brendanhiggins@...gle.com>,
        Daniel Latypov <dlatypov@...gle.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Dmitry Vyukov <dvyukov@...gle.com>, kunit-dev@...glegroups.com,
        kasan-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] kunit: tool: Add x86_64-smp architecture for SMP
 testing

On Wed, May 18, 2022 at 03:32PM +0800, 'David Gow' via KUnit Development wrote:
> Add a new QEMU config for kunit_tool, x86_64-smp, which provides an
> 8-cpu SMP setup. No other kunit_tool configurations provide an SMP
> setup, so this is the best bet for testing things like KCSAN, which
> require a multicore/multi-cpu system.
> 
> The choice of 8 CPUs is pretty arbitrary: it's enough to get tests like
> KCSAN to run with a nontrivial number of worker threads, while still
> working relatively quickly on older machines.
> 
> Signed-off-by: David Gow <davidgow@...gle.com>

Acked-by: Marco Elver <elver@...gle.com>

> ---
> 
> This is based off the discussion in:
> https://groups.google.com/g/kasan-dev/c/A7XzC2pXRC8
> 
> ---
>  tools/testing/kunit/qemu_configs/x86_64-smp.py | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>  create mode 100644 tools/testing/kunit/qemu_configs/x86_64-smp.py
> 
> diff --git a/tools/testing/kunit/qemu_configs/x86_64-smp.py b/tools/testing/kunit/qemu_configs/x86_64-smp.py
> new file mode 100644
> index 000000000000..a95623f5f8b7
> --- /dev/null
> +++ b/tools/testing/kunit/qemu_configs/x86_64-smp.py
> @@ -0,0 +1,13 @@
> +# SPDX-License-Identifier: GPL-2.0
> +from ..qemu_config import QemuArchParams
> +
> +QEMU_ARCH = QemuArchParams(linux_arch='x86_64',
> +			   kconfig='''
> +CONFIG_SERIAL_8250=y
> +CONFIG_SERIAL_8250_CONSOLE=y
> +CONFIG_SMP=y
> +			   ''',
> +			   qemu_arch='x86_64',
> +			   kernel_path='arch/x86/boot/bzImage',
> +			   kernel_command_line='console=ttyS0',
> +			   extra_qemu_params=['-smp', '8'])
> -- 
> 2.36.0.550.gb090851708-goog
> 
> -- 
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