[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1379360693.1974.29@driftwood>
Date: Mon, 16 Sep 2013 14:44:53 -0500
From: Rob Landley <rob@...dley.net>
To: Eric Wong <normalperson@...t.net>
Cc: Zach Brown <zab@...hat.com>, linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
Trond Myklebust <Trond.Myklebust@...app.com>,
Bryan Schumaker <bjschuma@...app.com>,
"Martin K. Petersen" <mkp@....net>, Jens Axboe <axboe@...nel.dk>,
Mark Fasheh <mfasheh@...e.com>,
Joel Becker <jlbec@...lplan.org>
Subject: Re: [RFC] extending splice for copy offloading
On 09/11/2013 04:17:23 PM, Eric Wong wrote:
> Zach Brown <zab@...hat.com> wrote:
> > Towards the end of that thread Eric Wong asked why we didn't just
> > extend splice. I immediately replied with some dumb dismissive
> > answer. Once I sat down and looked at it, though, it does make a
> > lot of sense. So good job, Eric. +10 Dummie points for me.
>
> Thanks for revisiting that :>
>
> > Some things to talk about:
> > - I really don't care about the naming here. If you do, holler.
>
> Exposing "DIRECT" to userspace now might confuse users into expecting
> O_DIRECT behavior. I say this as an easily-confused user.
>
> In the future, perhaps O_DIRECT behavior can become per-splice
> (instead
> of just per-open) and can save SPLICE_F_DIRECT for that.
>
> > - We might want different flags for file-to-file splicing and
> acceleration
> > - We might want flags to require or forbid acceleration
>
> > - We might want to provide all these flags to sendfile, too
>
> Another syscall? I prefer not. Better to just maintain the sendfile
> API as-is for compatibility reasons and nudge users towards splice.
>
> > Thoughts? Objections?
>
> I'll try to test/comment more in a week or two (not much time for
> computing until then).
Just a vague note that I've wanted to use splice implementing cp and
patch and cat and so on in toybox, but couldn't because it needs a pipe.
So I'm quite interested in moves to lift this restriction...
Rob--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists