Re: [PATCH 4/9] rcu: Register rcu-lazy shrinker only for CONFIG_RCU_LAZY=y kernels

[Frederic Weisbecker]

Le Wed, Mar 15, 2023 at 07:43:44PM +0000, Joel Fernandes (Google) a écrit :
> From: Zqiang <qiang1.zhang@xxxxxxxxx>
> 
> 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@xxxxxxxxx>
> Reviewed-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
> Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
> Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>

Reviewed-by: Frederic Weisbecker <frederic@xxxxxxxxxx>