[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <20230130172731.GT2948950@paulmck-ThinkPad-P17-Gen-1>
Date: Mon, 30 Jan 2023 09:27:31 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Joel Fernandes <joel@...lfernandes.org>
Cc: Zqiang <qiang1.zhang@...el.com>, frederic@...nel.org,
quic_neeraju@...cinc.com, rcu@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rcu: Register rcu-lazy shrinker only CONFIG_RCU_LAZY is
enabled
On Mon, Jan 30, 2023 at 10:00:42AM -0500, Joel Fernandes wrote:
> On Mon, Jan 30, 2023 at 2:12 AM Zqiang <qiang1.zhang@...el.com> wrote:
> >
> > The rcu-lazy shrinker is registered without CONFIG_RCU_LAZY enabled
> > is meaningless, this commit therefore make rcu-lazy shrinker is
> > registered only when CONFIG_RCU_LAZY is enabled.
> >
> > Signed-off-by: Zqiang <qiang1.zhang@...el.com>
>
> Reviewed-by: Joel Fernandes (Google) <joel@...lfernandes.org>
Queued and pushed, thank you both!
Twice, actually. I missed Joel's reviewed-by the first time around,
fixed now.
Thanx, Paul
> Thanks.
>
> > ---
> > kernel/rcu/tree_nocb.h | 4 ++++
> > 1 file changed, 4 insertions(+)
> >
> > diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
> > index 9e1c8caec5ce..28c1c092817b 100644
> > --- a/kernel/rcu/tree_nocb.h
> > +++ b/kernel/rcu/tree_nocb.h
> > @@ -1312,6 +1312,7 @@ int rcu_nocb_cpu_offload(int cpu)
> > }
> > EXPORT_SYMBOL_GPL(rcu_nocb_cpu_offload);
> >
> > +#ifdef CONFIG_RCU_LAZY
> > static unsigned long
> > lazy_rcu_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
> > {
> > @@ -1360,6 +1361,7 @@ static struct shrinker lazy_rcu_shrinker = {
> > .batch = 0,
> > .seeks = DEFAULT_SEEKS,
> > };
> > +#endif
> >
> > void __init rcu_init_nohz(void)
> > {
> > @@ -1391,8 +1393,10 @@ void __init rcu_init_nohz(void)
> > if (!rcu_state.nocb_is_setup)
> > return;
> >
> > +#ifdef CONFIG_RCU_LAZY
> > if (register_shrinker(&lazy_rcu_shrinker, "rcu-lazy"))
> > pr_err("Failed to register lazy_rcu shrinker!\n");
> > +#endif
> >
> > if (!cpumask_subset(rcu_nocb_mask, cpu_possible_mask)) {
> > pr_info("\tNote: kernel parameter 'rcu_nocbs=', 'nohz_full', or 'isolcpus=' contains nonexistent CPUs.\n");
> > --
> > 2.25.1
> >
Powered by blists - more mailing lists