linux-kernel - Re: [PATCH v3] PM / Sleep: Use workqueue for user space wakeup sources garbage collector

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Message-ID: <3758249.elpppgtaPW@vostro.rjw.lan>
Date:	Thu, 16 Jul 2015 02:29:36 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	SungEun Kim <cleaneye.kim@...r.kernel.org>
Cc:	pavel@....cz, len.brown@...el.com, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, "cleaeye.kim" <cleaneye.kim@....com>
Subject: Re: [PATCH v3] PM / Sleep: Use workqueue for user space wakeup sources garbage collector

On Friday, July 03, 2015 03:57:20 PM SungEun Kim wrote:
> From: "cleaeye.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.
> 
> Signed-off-by: SungEun Kim <cleaneye.kim@....com>

Queued up for 4.3, thanks!


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