linux-kernel - Re: [PATCH] nommu: fix kobjsize() for SLOB and SLUB

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Message-ID: <Pine.LNX.4.64.0805290759580.5111@schroedinger.engr.sgi.com>
Date:	Thu, 29 May 2008 08:00:58 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	David Howells <dhowells@...hat.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Paul Mundt <lethal@...ux-sh.org>,
	LKML <linux-kernel@...r.kernel.org>, cooloney@...nel.org,
	akpm@...ux-foundation.org, mpm@...enic.com
Subject: Re: [PATCH] nommu: fix kobjsize() for SLOB and SLUB

On Thu, 29 May 2008, David Howells wrote:

> > Could the nommu people either tell us what this is all about? Or junk the 
> > code. This looks very wrong.
> 
> ELF-FDPIC is currently using kobjsize() so that it can expand the heap/stack
> segment to fill up the entirety of its allocation.  It's probably worth
> dropping that, though.
> 
> NOMMU mmap() is using kobjsize()/ksize() to keep track of the number of bytes
> allocated and the amount of dead space.  We can probably ditch that too.
> 
> However, fs/proc/task_nommu.c uses kobjsize() quite a bit to determine how
> much metadata space a process is carrying around.  We could just use sizeof(),
> I suppose, and not bother calculating the slack.

The nagging question here is: Why is page->private used in kobjsize()?  A 
special heap/stack setup?


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