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

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Message-ID: <alpine.DEB.2.02.1105301102110.5766@asgard.lang.hm>
Date:	Mon, 30 May 2011 11:03:10 -0700 (PDT)
From:	david@...g.hm
To:	Valdis.Kletnieks@...edu
cc:	Oliver Neukum <oneukum@...e.de>,
	"D. Jansen" <d.g.jansen@...glemail.com>,
	Theodore Tso <tytso@....edu>, 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 Mon, 30 May 2011, Valdis.Kletnieks@...edu wrote:

> On Mon, 30 May 2011 09:13:27 +0200, Oliver Neukum said:
>> Am Montag, 30. Mai 2011, 03:53:18 schrieb david@...g.hm:
>
>>> if what you are wanting is the ability to say 'these things must be
>>> written before these other things to keep them from being corrupted, but I
>>> don't care when they get written (or if they get lost in a crash)' then
>>> what you want isn't fsync, it's a barrier.
>>
>> Yes, but where is the problem?
>
> The problem is that *from userspace*, the closest approximation to a barrier
> is fsync().

good point, there really should be some way of doing a barrier from 
userspace.

David Lang
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