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

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Message-ID: <29611.1212066517@redhat.com>
Date:	Thu, 29 May 2008 14:08:37 +0100
From:	David Howells <dhowells@...hat.com>
To:	Christoph Lameter <clameter@....com>
Cc:	dhowells@...hat.com, 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

Christoph Lameter <clameter@....com> 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.

David
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