linux-kernel - Re: [PATCH 2/4] torture: Remove CONFIG_NR

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Message-ID: <6f2969e3-344d-4f2d-a71c-ed999ac35324@paulmck-laptop>
Date: Thu, 23 Jan 2025 12:29:45 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: "Uladzislau Rezki (Sony)" <urezki@...il.com>
Cc: Boqun Feng <boqun.feng@...il.com>, RCU <rcu@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Cheung Wall <zzqq0103.hey@...il.com>,
	Neeraj upadhyay <Neeraj.Upadhyay@....com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: Re: [PATCH 2/4] torture: Remove CONFIG_NR_CPUS configuration

On Thu, Jan 23, 2025 at 07:58:26PM +0100, Uladzislau Rezki (Sony) wrote:
> This configuration specifies the maximum number of CPUs which
> is set to 8. The problem is that it can not be overwritten for
> something higher.
> 
> Remove that configuration for TREE05, so it is possible to run
> the torture test on as many CPUs as many system has.
> 
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>

You should be able to override this on the kvm.sh command line by
specifying "--kconfig CONFIG_NR_CPUS=128" or whatever number you wish.
For example, see the torture.sh querying the system's number of CPUs
and then specifying it to a number of tests.

Or am I missing something here?

						Thanx, Paul

> ---
>  tools/testing/selftests/rcutorture/configs/rcu/TREE05 | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/rcutorture/configs/rcu/TREE05 b/tools/testing/selftests/rcutorture/configs/rcu/TREE05
> index 9f48c73709ec..d6fbb82e3e6d 100644
> --- a/tools/testing/selftests/rcutorture/configs/rcu/TREE05
> +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE05
> @@ -1,5 +1,4 @@
>  CONFIG_SMP=y
> -CONFIG_NR_CPUS=8
>  CONFIG_PREEMPT_NONE=y
>  CONFIG_PREEMPT_VOLUNTARY=n
>  CONFIG_PREEMPT=n
> -- 
> 2.39.5
>