linux-kernel - Re: [RFC PATCH] net: add dataref destructor to sk

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Message-ID: <20091114011229.GA18580@gondor.apana.org.au>
Date:	Sat, 14 Nov 2009 09:12:30 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Gregory Haskins <ghaskins@...ell.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	alacrityvm-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC PATCH] net: add dataref destructor to sk_buff

On Tue, Nov 10, 2009 at 10:45:16AM -0500, Gregory Haskins wrote:
>
> What I am getting at is as follows:  From a real basic perspective, you
> can look at all of this as a simple synchronous call (i.e. sendmsg()).
> The "app" (be it a userspace app, or a guest) prepares a buffer for
> transmission, and offers it to the next layer in the stack.  The app
> must maintain the integrity of that buffer at least until the layer
> below it signifies that it is "consumed".  This may mean its a
> synchronous call, like sendmsg(), or it may be asynchronous, like AIO.

Neither sendmsg() nor sendfile() is synchronous in the way you
imagine.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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