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

[Joel Fernandes]

On Thu, Mar 16, 2023 at 12:19:19AM +0100, Frederic Weisbecker wrote:
> 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>

Thanks!

 - Joel