linux-kernel - [PATCH 0/2]: Kconfig options for wakelocks limit and gc (was: Re: [RFC][PATCH 8/8] PM / Sleep: Add user space ...)

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Message-Id: <201205032129.41611.rjw@sisk.pl>
Date:	Thu, 3 May 2012 21:29:41 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Arve Hjønnevåg <arve@...roid.com>
Cc:	NeilBrown <neilb@...e.de>, John Stultz <johnstul@...ibm.com>,
	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>, markgross@...gnar.org,
	Matthew Garrett <mjg@...hat.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	John Stultz <john.stultz@...aro.org>,
	Brian Swetland <swetland@...gle.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: [PATCH 0/2]: Kconfig options for wakelocks limit and gc (was: Re: [RFC][PATCH 8/8] PM / Sleep: Add user space ...)

On Friday, April 27, 2012, Rafael J. Wysocki wrote:
> On Friday, April 27, 2012, Arve Hjønnevåg wrote:
> > 2012/4/27 Rafael J. Wysocki <rjw@...k.pl>:
> > > On Friday, April 27, 2012, Arve Hjønnevåg wrote:
> > >> 2012/4/26 Rafael J. Wysocki <rjw@...k.pl>:
> > >> ...
> > >> > ---
> > >> > From: Rafael J. Wysocki <rjw@...k.pl>
> > >> > Subject: PM / Sleep: Add user space interface for manipulating wakeup sources, v3
> > >> >
> > >> > Android allows user space to manipulate wakelocks using two
> > >> > sysfs file located in /sys/power/, wake_lock and wake_unlock.
> > >> > Writing a wakelock name and optionally a timeout to the wake_lock
> > >> > file causes the wakelock whose name was written to be acquired (it
> > >> > is created before is necessary), optionally with the given timeout.
> > >> > Writing the name of a wakelock to wake_unlock causes that wakelock
> > >> > to be released.
> > >> >
> > >> > Implement an analogous interface for user space using wakeup sources.
> > >> > Add the /sys/power/wake_lock and /sys/power/wake_unlock files
> > >> > allowing user space to create, activate and deactivate wakeup
> > >> > sources, such that writing a name and optionally a timeout to
> > >> > wake_lock causes the wakeup source of that name to be activated,
> > >> > optionally with the given timeout.  If that wakeup source doesn't
> > >> > exist, it will be created and then activated.  Writing a name to
> > >> > wake_unlock causes the wakeup source of that name, if there is one,
> > >> > to be deactivated.  Wakeup sources created with the help of
> > >> > wake_lock that haven't been used for more than 5 minutes are garbage
> > >> > collected and destroyed.  Moreover, there can be only WL_NUMBER_LIMIT
> > >>
> > >> I think it would be better if the garbage collection and limit was
> > >> configurable and optional. I would probably turn both features off
> > >> since I do not want to chase down bugs because a wakelock was ignored,
> > >> and I think the garbage collection will erase stats that we care
> > >> about.
> > >
> > > OK, but would you mind if I added the configurability as a separate incremental
> > > patch?
> > >
> > 
> > That is fine with me.
> 
> Cool, thanks!

The following two patches add the configuration options for the limit and
garbage collector.  Please let me know if they are OK with you.

Thanks,
Rafael

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