linux-kernel - Re: [RFC][PATCH 0/2] PM / Sleep: Extended control of suspend/hibernate interfaces

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Message-ID: <CACVXFVO_qNoy=AMs4RQOPsNq5dnTsc-=-f70Njf9Hv8eRkx=+Q@mail.gmail.com>
Date:	Tue, 1 Nov 2011 03:55:50 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	mark gross <markgross@...gnar.org>,
	LKML <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Alan Stern <stern@...land.harvard.edu>,
	NeilBrown <neilb@...e.de>
Subject: Re: [RFC][PATCH 0/2] PM / Sleep: Extended control of
 suspend/hibernate interfaces

Hi,

On Fri, Oct 14, 2011 at 3:45 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:

> Second, to address the backup problem, we need to allow user space
> processes other than the suspend/hibernate process itself to prevent the
> system from being put into sleep states.  A mechanism for that is introduced
> by the second patch in the form of the /dev/sleepctl special device working
> kind of like user space wakelocks on Android (although in a simplified
> fashion).

I also have another similar example: write(fd, buffer, 100*4096).

Suppose only 80*4096 are copied into pages of the file, then someone
run ' echo mem > /sys/power/state ' to trigger system sleep, so only
partial writing is completed before system sleep and data inconsistence
may be caused for the file on filesystem.

But I am not sure if it is possible to happen in reality.

thank,
-- 
Ming Lei
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