Date: Fri, 29 Jun 2007 02:06:55 -0700 (PDT)
Message-Id: <20070629.020655.35469430.davem@davemloft.net>
To: clameter@sgi.com
Cc: hugh@veritas.com, James.Bottomley@steeleye.com, rmk+lkml@arm.linux.org.uk,
       akpm@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Containment measures for slab objects on scatter
 gather lists
From: David Miller <davem@davemloft.net>
In-Reply-To: <Pine.LNX.4.64.0706282357540.12146@schroedinger.engr.sgi.com>
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	<20070628.220606.112621271.davem@davemloft.net>
	<Pine.LNX.4.64.0706282357540.12146@schroedinger.engr.sgi.com>
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From: Christoph Lameter <clameter@sgi.com>
Date: Fri, 29 Jun 2007 00:00:39 -0700 (PDT)

> On Thu, 28 Jun 2007, David Miller wrote:
> 
> > Really, it would be great if we could treat kmalloc() objects
> > just like real pages.  Everything wants to do I/O on pages
> > but sometimes (like the networking) you have a kmalloc
> > chunk which is technically just a part of a page.
> > 
> > The fact that there is no easy way to make this work is
> > frustrating :-)
> 
> There is easy way: Allocate a page and just use the first N bytes. You can 
> specify the bytes to be used when putting the memory onto the scatter 
> gather list. This wastes memory but it works. You have real refcounting 
> since you got a real page.
> 
> How frequent are these objects?

Every single network packet.
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