linux-kernel - Re: [PATCH v2 02/10] freezer: skip waking up tasks with PF_FREEZER

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Message-ID: <20130503092413.GB13832@amd.pavel.ucw.cz>
Date:	Fri, 3 May 2013 11:24:13 +0200
From:	Pavel Machek <pavel@....cz>
To:	Colin Cross <ccross@...roid.com>
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>, arve@...roid.com,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH v2 02/10] freezer: skip waking up tasks with
 PF_FREEZER_SKIP set

On Wed 2013-05-01 18:35:00, Colin Cross wrote:
> Android goes through suspend/resume very often (every few seconds when
> on a busy wifi network with the screen off), and a significant portion
> of the energy used to go in and out of suspend is spent in the
> freezer.  If a task has called freezer_do_not_count(), don't bother
> waking it up.  If it happens to wake up later it will call
> freezer_count() and immediately enter the refrigerator.
> 
> Combined with patches to convert freezable helpers to use
> freezer_do_not_count() and convert common sites where idle userspace
> tasks are blocked to use the freezable helpers, this reduces the
> time and energy required to suspend and resume.
> 
> Signed-off-by: Colin Cross <ccross@...roid.com>

Acked-by: Pavel Machek <pavel@....cz>

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