linux-kernel - Re: [PATCH] Containment measures for slab objects on scatter gather lists

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Message-ID: <Pine.LNX.4.64.0706282357540.12146@schroedinger.engr.sgi.com>
Date:	Fri, 29 Jun 2007 00:00:39 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	David Miller <davem@...emloft.net>
cc:	hugh@...itas.com, James.Bottomley@...eleye.com,
	rmk+lkml@....linux.org.uk, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Containment measures for slab objects on scatter gather
 lists

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?

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