linux-kernel - Re: [PATCH 1/2] PM / Wakeup: Introduce wakeup source objects and event statistics (v3)

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Message-ID: <20100920185908.GA29380@suse.de>
Date:	Mon, 20 Sep 2010 11:59:08 -0700
From:	Greg KH <gregkh@...e.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Kevin Hilman <khilman@...prootsystems.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH 1/2] PM / Wakeup: Introduce wakeup source objects and
 event statistics (v3)

On Mon, Sep 20, 2010 at 07:59:09PM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
> Subject: PM / Wakeup: Introduce wakeup source objects and event statistics (v3)
> 
> Introduce struct wakeup_source for representing system wakeup sources
> within the kernel and for collecting statistics related to them.
> Make the recently introduced helper functions pm_wakeup_event(),
> pm_stay_awake() and pm_relax() use struct wakeup_source objects
> internally, so that wakeup statistics associated with wakeup devices
> can be collected and reported in a consistent way (the definition of
> pm_relax() is changed, which is harmless, because this function is
> not called directly by anyone yet).  Introduce new wakeup-related
> sysfs device attributes in /sys/devices/.../power for reporting the
> device wakeup statistics.
> 
> Change the global wakeup events counters event_count and
> events_in_progress into atomic variables, so that it is not necessary
> to acquire a global spinlock in pm_wakeup_event(), pm_stay_awake()
> and pm_relax(), which should allow us to avoid lock contention in
> these functions on SMP systems with many wakeup devices.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

Acked-by: Greg Kroah-Hartman <gregkh@...e.de>

Nice job!
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