linux-kernel - Re: [PATCH 5/7] cpuidle: Introduce CPUIDLE_FLAG_POLLING

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Message-ID: <ZcUEvKzbiTfd12wd@localhost.localdomain>
Date: Thu, 8 Feb 2024 17:43:40 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-pm@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH 5/7] cpuidle: Introduce CPUIDLE_FLAG_POLLING_HARD

Le Tue, Dec 12, 2023 at 02:12:48PM +0100, Rafael J. Wysocki a écrit :
> > diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
> > index 66b59868622c..873fdf200dc3 100644
> > --- a/include/linux/cpuidle.h
> > +++ b/include/linux/cpuidle.h
> > @@ -78,13 +78,14 @@ struct cpuidle_state {
> >
> >  /* Idle State Flags */
> >  #define CPUIDLE_FLAG_NONE              (0x00)
> > -#define CPUIDLE_FLAG_POLLING_SOFT              BIT(0) /* polling state */
> > +#define CPUIDLE_FLAG_POLLING_SOFT      BIT(0) /* software need_resched() polling state */
> >  #define CPUIDLE_FLAG_COUPLED           BIT(1) /* state applies to multiple cpus */
> >  #define CPUIDLE_FLAG_TIMER_STOP        BIT(2) /* timer is stopped on this state */
> >  #define CPUIDLE_FLAG_UNUSABLE          BIT(3) /* avoid using this state */
> >  #define CPUIDLE_FLAG_OFF               BIT(4) /* disable this state by default */
> >  #define CPUIDLE_FLAG_TLB_FLUSHED       BIT(5) /* idle-state flushes TLBs */
> >  #define CPUIDLE_FLAG_RCU_IDLE          BIT(6) /* idle-state takes care of RCU */
> > +#define CPUIDLE_FLAG_POLLING_HARD      BIT(7) /* hardware need_resched() polling state */
> 
> Hardware need_resched() monitoring rather?  This doesn't do what
> "polling" usually means AFAICS.

Fair enough!

> >
> >  struct cpuidle_device_kobj;
> >  struct cpuidle_state_kobj;
> > --