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

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Date:	Fri, 13 Nov 2009 21:27:57 -0500
From:	Gregory Haskins <gregory.haskins@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
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

Herbert Xu wrote:
> On Fri, Nov 13, 2009 at 08:33:35PM -0500, Gregory Haskins wrote:
>> Well, not with respect to the overall protocol, of course not.  But with
>> respect to the buffer in question, it _has_ to be.  Or am I missing
>> something?
> 
> sendfile() has never guaranteed that the kernel is finished with
> the underlying pages when it returns.
> 
> Cheers,

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?

-Greg


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