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

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Message-ID: <87zlisz9pg.fsf@basil.nowhere.org>
Date:	Fri, 19 Dec 2008 12:27:23 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Vladislav Bolkhovitin <vst@...b.net>
Cc:	linux-mm@...ck.org, Christoph Hellwig <hch@...radead.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	scst-devel@...ts.sourceforge.net,
	Bart Van Assche <bart.vanassche@...il.com>,
	netdev@...r.kernel.org
Subject: Re: [RFC]: Support for zero-copy TCP transmit of user space data

Vladislav Bolkhovitin <vst@...b.net> writes:
>
>  - Although usage of struct page to keep network related pointer might
> look as a layering violation, it isn't. I wrote in
> http://lkml.org/lkml/2008/12/15/190 why.

Sorry but extending struct page for this is really a bad idea because
of the extreme memory overhead even when it's not used (which is a 
problem on distribution kernels) Find some other way to store this
information.  Even for patches with more general value it was not
acceptable.

-Andi


-- 
ak@...ux.intel.com
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