From: "Jörn Engel" <joern@wohnheim.fh-wedel.de>
To: Folkert van Heusden <folkert@vanheusden.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: zero-copy read() interface
Date: Thu, 18 Aug 2005 12:05:36 +0200 [thread overview]
Message-ID: <20050818100536.GB16751@wohnheim.fh-wedel.de> (raw)
In-Reply-To: <20050818100151.GF12313@vanheusden.com>
On Thu, 18 August 2005 12:01:52 +0200, Folkert van Heusden wrote:
>
> What about a zero-copy read-interface?
> An ioctl (or something) which enables the kernel to do dma directly to
> the userspace. Of course this should be limited to the root-user or a
> user with special capabilities (rights) since if a drive screws up, data
> from a different sector (or so) might end up in the proces' memory. Of
> course copying a sector from kernel- to userspace can be done pretty
> fast but i.m.h.o. all possible speedimprovements should be made unless
> unclean.
Just use mmap(). Unlike your proposal, it cooperates with the page
cache.
Jörn
--
Don't worry about people stealing your ideas. If your ideas are any good,
you'll have to ram them down people's throats.
-- Howard Aiken quoted by Ken Iverson quoted by Jim Horning quoted by
Raph Levien, 1979
next prev parent reply other threads:[~2005-08-18 10:06 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-18 10:01 Folkert van Heusden
2005-08-18 10:05 ` Jörn Engel [this message]
2005-08-18 10:41 ` Folkert van Heusden
2005-08-18 13:13 ` Jörn Engel
2005-08-18 23:34 ` dean gaudet
2005-08-19 8:33 ` Jörn Engel
2005-08-21 9:01 ` Andrew Morton
2005-08-18 10:06 ` Christoph Hellwig
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