linux-kernel - Re: [PATCH 4/9] rcu: Register rcu-lazy shrinker only for CONFIG_RCU

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Date:   Thu, 16 Mar 2023 00:19:19 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc:     linux-kernel@...r.kernel.org,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Zqiang <qiang1.zhang@...el.com>, rcu@...r.kernel.org
Subject: Re: [PATCH 4/9] rcu: Register rcu-lazy shrinker only for
 CONFIG_RCU_LAZY=y kernels

Le Wed, Mar 15, 2023 at 07:43:44PM +0000, Joel Fernandes (Google) a écrit :
> From: Zqiang <qiang1.zhang@...el.com>
> 
> The lazy_rcu_shrink_count() shrinker function is registered even in
> kernels built with CONFIG_RCU_LAZY=n, in which case this function
> uselessly consumes cycles learning that no CPU has any lazy callbacks
> queued.
> 
> This commit therefore registers this shrinker function only in the kernels
> built with CONFIG_RCU_LAZY=y, where it might actually do something useful.
> 
> Signed-off-by: Zqiang <qiang1.zhang@...el.com>
> Reviewed-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
> Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>

Reviewed-by: Frederic Weisbecker <frederic@...nel.org>