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Re: [Xen-devel] Reducing impact of save/restore/dump on Dom0

from [Jeremy Fitzhardinge] [Permanent Link][Original]
To: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Reducing impact of save/restore/dump on Dom0
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 06 Feb 2007 23:41:56 -0800
Cc: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Graham, Simon" <Simon.Graham@xxxxxxxxxxx>
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Rusty Russell wrote:
> On Tue, 2007-02-06 at 15:20 -0800, Jeremy Fitzhardinge wrote:
>   
>> O_DIRECT is strongly deprecated.  fadvise(..., FADV_DONTNEED, ...) is
>> the preferred interface.
>>     
>
> Really?  I know raw was deprecated in favour of O_DIRECT.  But you'd
> have to call FADV_DONTNEED after every read AFAICT...
>   

Linus was having a bit of a rant about it last week.  O_DIRECT works for
straightforward use, but it's a bit of a crapshoot if you mix it with
pagecached operations.

    J

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