linux-kernel - Re: [PATCH][RFC 23/23]: Support for zero-copy TCP transmit of user space data

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Message-ID: <20081220065105.GA16936@gondor.apana.org.au>
Date:	Sat, 20 Dec 2008 17:51:05 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Evgeniy Polyakov <zbr@...emap.net>,
	Vladislav Bolkhovitin <vst@...b.net>,
	linux-scsi@...r.kernel.org,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Mike Christie <michaelc@...wisc.edu>,
	Jeff Garzik <jeff@...zik.org>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, scst-devel@...ts.sourceforge.net,
	Bart Van Assche <bart.vanassche@...il.com>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	netdev@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH][RFC 23/23]: Support for zero-copy TCP transmit of user
	space data

On Fri, Dec 19, 2008 at 10:14:47PM -0800, Jeremy Fitzhardinge wrote:
>
> Ah, so the lifetime of the shared_info structure doesn't match the  
> lifetime of the underlying pages, and this mechanism would be  
> insufficient for my purposes?

Right.

> If so, how can it be solved?

Well since each individual page can be pulled out I think you
just have to track them.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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