linux-kernel - Re: [PATCH v3]PM/Sleep: Timer quiesce in freeze state

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Message-ID: <54C73A72.7030005@linux.intel.com>
Date:	Tue, 27 Jan 2015 15:12:50 +0800
From:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	Peter Zijlstra <peterz@...radead.org>,
	"Brown, Len" <len.brown@...el.com>,
	"alan@...ux.intel.com" <alan@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v3]PM/Sleep: Timer quiesce in freeze state

On 2015/1/26 22:45, Rafael J. Wysocki wrote:
> On Monday, January 26, 2015 03:15:43 PM Thomas Gleixner wrote:
>> On Mon, 26 Jan 2015, Rafael J. Wysocki wrote:
>>
>>> On Monday, January 26, 2015 10:40:24 AM Thomas Gleixner wrote:
>>>> On Mon, 26 Jan 2015, Li, Aubrey wrote:
>>>>> On 2015/1/22 18:15, Thomas Gleixner wrote:
>>>>>> Can we please stop adding more crap to that notifier thing? I rather
>>>>>> see that go away than being expanded.
>>>>>
>>>>> Are you referring to FREEZE_PREPARE or remove all of FREEZE staff at all?
>>>>>
>>>>> What's the disadvantage of adding more notifier?
>>>>
>>>> clockevents_notify() is not a notifier. Its a multiplex call and I
>>>> want to get rid of it and replace it with explicit functions.
>>>
>>> OK, so perhaps we need to move _SUSPEND/_RESUME out of there to start with?
>>>
>>> As far as I can say, clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL) and
>>> clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL) are each only called from
>>> one place and moreover, since they are in syscore_ops, we don't need any
>>> locking around them.
>>>
>>> So what about the patch below?
>>
>> I'm cleaning up the whole replacement of notify. The stuff below is
>> part of it.
>>
>>>  
>>> -	clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL);
>>> +	tick_suspend();
>>> +	tick_suspend_broadcast();
>>
>> That's exactly the stuff I don't want to see. Blind code
>> move.
> 
> At least it's clear what the patch does. :-)
> 
>> tick_suspend_broadcast() wants to be called from tick_suspend().
> 
> OK
> 
>> Still compiling and testing a gazillion of combinations.
> 
> OK, so it looks like we need to wait with the suspend to idle changes until
> this lands.

Please cc the patches to me when you post. I'll refine the patch after that.

Thanks,
-Aubrey
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