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From: Frederic Weisbecker <frederic@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] sched: Add default dynamic preempt mode Kconfig
Date: Wed, 9 Jun 2021 13:25:44 +0200	[thread overview]
Message-ID: <20210609112544.GB104634@lothringen> (raw)
In-Reply-To: <YL9271QMQfyn174k@hirez.programming.kicks-ass.net>

On Tue, Jun 08, 2021 at 03:55:59PM +0200, Peter Zijlstra wrote:
> On Tue, Jun 08, 2021 at 02:04:41PM +0200, Frederic Weisbecker wrote:
> > diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> > index 9e9a5be35cde..df47a8275c37 100644
> > --- a/kernel/sched/core.c
> > +++ b/kernel/sched/core.c
> > @@ -6238,6 +6238,14 @@ enum {
> >  
> >  int preempt_dynamic_mode = preempt_dynamic_full;
> >  
> > +#if defined(CONFIG_PREEMPT_DYNAMIC_FULL)
> > +static __initdata int preempt_dynamic_mode_init = preempt_dynamic_full;
> > +#elif defined(CONFIG_PREEMPT_DYNAMIC_VOLUNTARY)
> > +static __initdata int preempt_dynamic_mode_init = preempt_dynamic_voluntary;
> > +#elif defined(CONFIG_PREEMPT_DYNAMIC_NONE)
> > +static __initdata int preempt_dynamic_mode_init = preempt_dynamic_none;
> > +#endif
> 
> Why does preempt_dynamic_mode_init exist? Why can't we simply set
> preempt_dynamic_mode?

To avoid the unconditional calls to static_call_update() on boot but I can do
it in a more simple way.

Thanks.

  reply	other threads:[~2021-06-09 11:25 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-08 12:04 [PATCH 0/2] sched: Define default preempt dynamic boot mode on Kconfig Frederic Weisbecker
2021-06-08 12:04 ` [PATCH 1/2] sched: Add default dynamic preempt mode Kconfig Frederic Weisbecker
2021-06-08 13:55   ` Peter Zijlstra
2021-06-08 14:04     ` Peter Zijlstra
2021-06-09 11:27       ` Frederic Weisbecker
2021-06-09 11:13     ` Frederic Weisbecker
2021-06-08 13:55   ` Peter Zijlstra
2021-06-09 11:25     ` Frederic Weisbecker [this message]
2021-06-08 12:04 ` [PATCH 2/2] sched: Always print out preempt dynamic state Frederic Weisbecker
2021-06-08 13:56   ` Peter Zijlstra

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