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From: "Li, Aubrey" <aubrey.li@linux.intel.com>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Aubrey Li <aubrey.li@intel.com>,
	tglx@linutronix.de, peterz@infradead.org, len.brown@intel.com,
	ak@linux.intel.com, tim.c.chen@linux.intel.com,
	linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v2 0/8] Introduct cpu idle prediction functionality
Date: Tue, 17 Oct 2017 15:32:45 +0800	[thread overview]
Message-ID: <a94fb81f-0491-2c77-19a2-88d951046f10@linux.intel.com> (raw)
In-Reply-To: <3251888.IpbWLYog7H@aspire.rjw.lan>

On 2017/10/17 8:07, Rafael J. Wysocki wrote:
> On Monday, October 16, 2017 9:44:41 AM CEST Li, Aubrey wrote:
>>
>> Or you concern why the threshold can't simply be tick interval?
> 
> That I guess.
> 
>> For the latter, if the threshold is close/equal to the tick, it's quite possible
>> the next event is the tick and no other else event.
> 
> Well, I don't quite get that.
> 
> What's the reasoning here?

if we set the threshold to the tick interval, when the system keeps the tick on once,
it will have no chance to turn if off forever.

Because we turn on the tick, and count in the time of idle entry and idle exit,
the idle interval always < tick interval, that means idle is always a short idle.

Thanks,
-Aubrey

  reply	other threads:[~2017-10-17  7:32 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-30  7:20 Aubrey Li
2017-09-30  7:20 ` [RFC PATCH v2 1/8] cpuidle: menu: extract " Aubrey Li
2017-10-14  0:26   ` Rafael J. Wysocki
2017-10-16  2:46     ` Li, Aubrey
2017-09-30  7:20 ` [RFC PATCH v2 2/8] cpuidle: record the overhead of idle entry Aubrey Li
2017-10-14  0:35   ` Rafael J. Wysocki
2017-10-16  3:11     ` Li, Aubrey
2017-10-17  0:05       ` Rafael J. Wysocki
2017-10-17  7:04         ` Li, Aubrey
2017-09-30  7:20 ` [RFC PATCH v2 3/8] cpuidle: add a new predict interface Aubrey Li
2017-10-14  0:45   ` Rafael J. Wysocki
2017-10-16  8:04     ` Li, Aubrey
2017-10-14  1:27   ` Rafael J. Wysocki
2017-10-16  9:52     ` Li, Aubrey
2017-09-30  7:20 ` [RFC PATCH v2 4/8] tick/nohz: keep tick on for a fast idle Aubrey Li
2017-10-14  0:51   ` Rafael J. Wysocki
2017-10-16  3:26     ` Li, Aubrey
2017-10-16  4:45       ` Mike Galbraith
2017-10-16  5:34         ` Li, Aubrey
2017-10-16  6:25           ` Mike Galbraith
2017-10-16  6:31             ` Li, Aubrey
2017-09-30  7:20 ` [RFC PATCH v2 5/8] timers: keep sleep length updated as needed Aubrey Li
2017-10-14  0:56   ` Rafael J. Wysocki
2017-10-16  6:46     ` Li, Aubrey
2017-10-16 23:58       ` Rafael J. Wysocki
2017-10-17  6:10         ` Li, Aubrey
2017-09-30  7:20 ` [RFC PATCH v2 6/8] cpuidle: make fast idle threshold tunable Aubrey Li
2017-10-14  0:59   ` Rafael J. Wysocki
2017-10-16  6:00     ` Li, Aubrey
2017-10-17  0:01       ` Rafael J. Wysocki
2017-10-17  6:12         ` Li, Aubrey
2017-09-30  7:20 ` [RFC PATCH v2 7/8] cpuidle: introduce irq timing to make idle prediction Aubrey Li
2017-10-14  1:01   ` Rafael J. Wysocki
2017-10-16  6:03     ` Li, Aubrey
2017-09-30  7:20 ` [RFC PATCH v2 8/8] cpuidle: introduce run queue average idle " Aubrey Li
2017-10-14  1:02   ` Rafael J. Wysocki
2017-10-14  1:14 ` [RFC PATCH v2 0/8] Introduct cpu idle prediction functionality Rafael J. Wysocki
2017-10-16  7:44   ` Li, Aubrey
2017-10-17  0:07     ` Rafael J. Wysocki
2017-10-17  7:32       ` Li, Aubrey [this message]
2017-11-30  1:00 ` Li, Aubrey
2017-11-30  1:37   ` Rafael J. Wysocki

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