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

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Message-ID: <20091114024356.GA19202@gondor.apana.org.au>
Date:	Sat, 14 Nov 2009 10:43:56 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Gregory Haskins <gregory.haskins@...il.com>
Cc:	Gregory Haskins <ghaskins@...ell.com>,
	"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 Fri, Nov 13, 2009 at 09:27:57PM -0500, Gregory Haskins wrote:
>
> Clearly there must be _some_ mechanism to synchronize (e.g.
> flush/barrier) though, right?  Otherwise, that interface would seem to
> be quite prone to races and would likely be unusable.   So what does
> said flush use to know when the buffer is free?

It is up to the application to devise its own sync mechanism.
For TCP, you may query the kernel for the last sequence number
acked by the other side.

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