linux-kernel - Re: [PATCH v4] rcu/nocb: Add an option to offload all CPUs on boot

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Message-ID: <Yl7mt2XkHo7obhpz@pc638.lan>
Date:   Tue, 19 Apr 2022 18:43:35 +0200
From:   Uladzislau Rezki <urezki@...il.com>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc:     linux-kernel@...r.kernel.org,
        Josh Triplett <josh@...htriplett.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Paul E. McKenney" <paulmck@...nel.org>, rcu@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        rushikesh.s.kadam@...el.com, vineethrp@...il.com, urezki@...il.com
Subject: Re: [PATCH v4] rcu/nocb: Add an option to offload all CPUs on boot

On Mon, Apr 18, 2022 at 05:54:03PM +0000, Joel Fernandes (Google) wrote:
> From: Joel Fernandes <joel@...lfernandes.org>
> 
> On systems with CONFIG_RCU_NOCB_CPU=y, there is no default mask provided
> which ends up not offloading any CPU. This patch removes a dependency
> from the bootloader having to know about RCU and about how to provide
> the mask.
> 
> With the new option enabled, all CPUs will be offloaded on boot unless
> rcu_nocbs= or rcu_nohz_full= kernel parameters provide a CPU list.
> 
> Signed-off-by: Joel Fernandes <joel@...lfernandes.org>
> ---
> v4: mostly style related fixes.
> v3 is back to v1 but with a config option defaulting to 'n'.
> v2 was forcing the option to override no_cbs=
>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@...il.com>

--
Uladzislau Rezki