linux-kernel - Re: [RFC/PATCH 2/3] SLUB: make ksize() more strict for page allocator pass-through

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Message-ID: <4834704D.6020809@cs.helsinki.fi>
Date:	Wed, 21 May 2008 21:56:13 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Christoph Lameter <clameter@....com>
CC:	linux-kernel@...r.kernel.org, mpm@...enic.com, lethal@...ux-sh.org,
	dhowells@...hat.com
Subject: Re: [RFC/PATCH 2/3] SLUB: make ksize() more strict for page allocator
 pass-through

Christoph Lameter wrote:
> Why is it too big? Without your additions it is converting kmallocs 
> inline to get_free_pages(). That results in a simple function call with 
> two constant parameters.

Well, it's a PITA because of #include dependencies in any case. Is 
moving it out-of-line a problem?

Christoph Lameter wrote:
> The patch touches the page struct uselessly. I think the PageSlab marking 
> is useful for debugging but not for a production kernel.

Hmm, where? page_address() already references ->virtual. I suppose 
CONFIG_SLUB_DEBUG is a no no as well then so do we want to add a 
CONFIG_KSIZE_DEBUG config option...? (Btw, I removed the BUG_ON() from 
kfree() as spotted by Vegard Nossum.)

			Pekka
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