Date: Mon, 6 Mar 2006 21:07:36 -0500
From: Benjamin LaHaise <bcrl@kvack.org>
To: Dan Aloni <da-x@monatomic.org>
Cc: "David S. Miller" <davem@davemloft.net>, drepper@gmail.com,
       linux-kernel@vger.kernel.org
Subject: Re: Status of AIO
Message-ID: <20060307020736.GW20768@kvack.org>
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On Tue, Mar 07, 2006 at 04:04:11AM +0200, Dan Aloni wrote:
> This somehow resembles the scatter-gatter lists already used in some 
> subsystems such as the SCSI sg driver. 

None of the iovecs are particularly special.  What's special here is that 
particulars of the container make the fast path *cheap*.

> BTW you have to make these pages Copy-On-Write before this procedure 
> starts because you wouldn't want it to accidently fill the zero page, 
> i.e. the VM will have to supply a unique set of pages otherwise it 
> messes up.

No, that would be insanely expensive.  There's no way this would be done 
transparently to the user unless we know that we're blocking until the 
transmit is complete.

		-ben
-- 
"Time is of no importance, Mr. President, only life is important."
Don't Email: <dont@kvack.org>.
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