linux-kernel - Re: [rfc] Ignore Fsync Calls in Laptop

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Date:	Tue, 31 May 2011 11:23:24 -0700 (PDT)
From:	david@...g.hm
To:	"D. Jansen" <d.g.jansen@...glemail.com>
cc:	"Ted Ts'o" <tytso@....edu>, Oliver Neukum <oneukum@...e.de>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Dave Chinner <david@...morbit.com>, njs@...ox.com,
	bart@...wel.tk
Subject: Re: [rfc] Ignore Fsync Calls in Laptop_Mode

On Tue, 31 May 2011, D. Jansen wrote:

> On Tue, May 31, 2011 at 4:03 AM, Ted Ts'o <tytso@....edu> wrote:
>> On Mon, May 30, 2011 at 11:24:03PM +0200, D. Jansen wrote:
>>>> do you really have so many fsync's going on that the disk spins up so much
>>>> that you would gain 10-20% battery life?
>>>
>>> Yes. Every autosave in LibreOffice triggers one. And I want autosave,
>>> but I want them in memory, not on disk.
>>
>> What on *heck* good does an autosave to memory do?  Are you afraid
>> your X server is going to go poof, or OpenOffice is going to crash on
>> you?
> Unfortunately, yes. This happens to me regularly, e.g. roughly every
> 10th resume. It's a poulsbo system. ;)
> Another reason is a Java extension that makes it crash happy.
> (Please don't tell me now that the real fix is to fix poulsbo...)
>
>> I can't remember the last time this has happened to me.  It's
>> typically a system crash or a power loss that causes me to lose an
>> OpenOffice session.
>
> Well, good for you! Power loss didn't ever occur to me on the other
> hand, at least not on my netbook.

failure to resume is effectivly power loss. a autosave to ram would be 
lost, just like with a power loss or system crash.

David Lang