linux-kernel - Re: + fix-spellings-of-slab-allocator-section-in-init-kconfig.patch added to -mm tree

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Date:	Tue, 08 May 2007 18:55:39 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	clameter@....com
Cc:	mpm@...enic.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: +
 fix-spellings-of-slab-allocator-section-in-init-kconfig.patch added to -mm
 tree

From: Christoph Lameter <clameter@....com>
Date: Tue, 8 May 2007 18:53:28 -0700 (PDT)

> On Tue, 8 May 2007, David Miller wrote:
> 
> > SLOB seems to look at the descriptor in the previous blob to figure
> > out how big the being-freed blob is.  That's actually kind of clever
> > :-)
> 
> We were assuming that the objects are actually allocated. How does it 
> figure out the previous blobs boundaries without metadata?

The page is filled entirely with descriptors in the not-in-use regions
of the page aparently.  So "freed_object - 1" will always give you
a descriptor.

I'm just reading over the code to figure out what to type to you, you
could read the code too it's not very complicated :-)
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