linux-kernel - Re: [PATCH] tcp: splice as many packets as possible at once

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Message-Id: <20090113.202531.43266519.davem@davemloft.net>
Date:	Tue, 13 Jan 2009 20:25:31 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	zbr@...emap.net, dada1@...mosbay.com, w@....eu, ben@...s.com,
	jarkao2@...il.com, mingo@...e.hu, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, jens.axboe@...cle.com
Subject: Re: [PATCH] tcp: splice as many packets as possible at once

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Wed, 14 Jan 2009 14:51:24 +1100

> Unfortunately this won't work, not even for network destinations.
> 
> The reason is that this gets called as soon as the destination's
> splice hook returns, for networking that means when sendpage returns.
> 
> So by that time we'll still be left with just a page reference
> on a page where the slab memory may already have been freed.
> 
> To make this work we need to get the destination's splice hooks
> to acquire this reference.

Yes I realized this after your earlier posting today.
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