linux-kernel - Re: [PATCH v2] PM / Sleep: Use workqueue for user space wakeup sources garbage collector

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Date:	Wed, 15 Jul 2015 12:35:55 +0900
From:	"SungEun Kim(cleaneye.kim@....com)" <cleaneye.kim@....com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	pavel@....cz, len.brown@...el.com, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] PM / Sleep: Use workqueue for user space wakeup
 sources garbage collector



On 2015-07-03 오후 2:03, SungEun Kim(cleaneye.kim@....com) wrote:
> On 2015-07-03 오전 9:15, Rafael J. Wysocki wrote:
>> On Wednesday, July 01, 2015 05:28:48 PM SungEun Kim wrote:
>>> From: "SungEun Kim" <cleaneye.kim@....com>
>>>
>>> The synchronous synchronize_rcu in wakeup_source_remove makes user
>> process
>>> which writes to /sys/kernel/wake_unlock blocked sometimes.
>>>
>>> For example, when android eventhub tries to release wakelock,
>>> this blocking process can occur, and eventhub can't get input event
>>> for a while.
>>>
>>> Using workqueue instead of direct function call at pm_wake_unlock
>>> can prevent this unnecessary delay of an user space process.
>>
>> The idea is defendable, but the patch is too simple.
>>
>> For example, if the garbage collection is in progress, it is not useful
>> to start a new one.
>>
>> Also the incrementation and clearing of wakelocks_gc_count should be under
>> the lock.
> 
> Thank you for your advices.
> I will correct and amend my patch and then submit v3 patch.
> 
> Thank you.
> SungEun Kim
> 

Dear Wysocki,

I've submit patch v3.
Could you review patch v3?

Thank you.
SungEun Kim

>>
>>
>> -- 
>> I speak only for myself.
>> Rafael J. Wysocki, Intel Open Source Technology Center.
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