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Subject: Re: benchmarks of O_STREAMING in 2.5
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Padraig Brady <padraig.brady@corvil.com>
Cc: Robert Love <rml@tech9.net>, akpm@digeo.com,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Mon, 2002-10-21 at 15:32, Padraig Brady wrote:
> I'm confused. Isn't this just an O_STREAM flag on open/fcntl ?
> How could it be simpler? I suppose the VM could do better than
> it currently does automatically but there is no harm in the app
> giving a hint like this thus allowing stuff to be dropped from
> the cache more aggresively?

Which bit are you streaming, what kind of things are you doing with the
data ?

Take a database table are you - accessing it sequentially with caching,
accessing it randomly without readahead or streaming it and discarding
data. All three are valid answers, for the same data, and potentially on
a per table basis in the same file.

See the fadvise proposal. O_STREAMING is basically a subset of what is
needed

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