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Message-ID: <20230316022853.GA110573@google.com>
Date: Thu, 16 Mar 2023 02:28:53 +0000
From: Joel Fernandes <joel@...lfernandes.org>
To: Frederic Weisbecker <frederic@...nel.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
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@...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>
Thanks!
- Joel
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