From: Peter Zijlstra <peterz@infradead.org>
To: Frederic Weisbecker <frederic@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Linux PM <linux-pm@vger.kernel.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
Thomas Ilsche <thomas.ilsche@tu-dresden.de>,
Doug Smythies <dsmythies@telus.net>,
Rik van Riel <riel@surriel.com>,
Aubrey Li <aubrey.li@linux.intel.com>,
Mike Galbraith <mgalbraith@suse.de>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFT][PATCH v4 1/7] time: tick-sched: Reorganize idle tick management code
Date: Wed, 14 Mar 2018 18:20:16 +0100 [thread overview]
Message-ID: <20180314172016.GO4064@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20180314154934.GA3635@lerouge>
On Wed, Mar 14, 2018 at 04:49:39PM +0100, Frederic Weisbecker wrote:
> On Mon, Mar 12, 2018 at 10:47:41AM +0100, Rafael J. Wysocki wrote:
> > @@ -136,6 +138,13 @@ static inline u64 get_cpu_idle_time_us(i
> > static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
> > #endif /* !CONFIG_NO_HZ_COMMON */
> >
> > +static inline void tick_nohz_idle_stop_tick_protected(void)
> > +{
> > + local_irq_disable();
> > + tick_nohz_idle_stop_tick();
> > + local_irq_enable();
> > +}
>
> It seems that even if we have CONFIG_NO_HZ_COMMON=n,
> tick_nohz_idle_stop_tick_protected() will have overhead, right?
IIRC the only callsite of the _protected thing that remains at the end
is in the hotplug path. So who cares ;-)
next prev parent reply other threads:[~2018-03-14 17:20 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-12 9:46 [RFT][PATCH v4 0/7] sched/cpuidle: Idle loop rework Rafael J. Wysocki
2018-03-12 9:47 ` [RFT][PATCH v4 1/7] time: tick-sched: Reorganize idle tick management code Rafael J. Wysocki
2018-03-14 15:49 ` Frederic Weisbecker
2018-03-14 17:20 ` Peter Zijlstra [this message]
2018-03-15 17:26 ` Frederic Weisbecker
2018-03-15 12:33 ` Rafael J. Wysocki
2018-03-12 9:51 ` [RFT][PATCH v4 2/7] sched: idle: Do not stop the tick upfront in the idle loop Rafael J. Wysocki
2018-03-15 16:10 ` Frederic Weisbecker
2018-03-15 16:50 ` Rafael J. Wysocki
2018-03-12 9:53 ` [RFT][PATCH v4 3/7] sched: idle: Do not stop the tick before cpuidle_idle_call() Rafael J. Wysocki
2018-03-15 18:19 ` Frederic Weisbecker
2018-03-15 20:41 ` Rafael J. Wysocki
2018-03-15 21:12 ` Rafael J. Wysocki
2018-03-16 14:17 ` Frederic Weisbecker
2018-03-16 14:16 ` Frederic Weisbecker
2018-03-12 9:54 ` [RFT][PATCH v4 4/7] cpuidle: Return nohz hint from cpuidle_select() Rafael J. Wysocki
2018-03-14 12:59 ` Peter Zijlstra
2018-03-15 12:54 ` Rafael J. Wysocki
2018-03-12 10:04 ` [RFT][PATCH v4 5/7] sched: idle: Select idle state before stopping the tick Rafael J. Wysocki
2018-03-12 10:05 ` [RFT][PATCH v4 6/7] cpuidle: menu: Refine idle state selection for running tick Rafael J. Wysocki
2018-03-12 10:07 ` [RFT][PATCH v4 7/7] cpuidle: menu: Avoid selecting shallow states with stopped tick Rafael J. Wysocki
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