linux-kernel - Re: [PATCH] add __GFP_ZERO to GFP_LEVEL

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Date:	Tue, 24 Jul 2007 12:25:42 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mel Gorman <mel@...net.ie>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Daniel Phillips <phillips@...gle.com>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH] add __GFP_ZERO to GFP_LEVEL_MASK

On Tue, 24 Jul 2007 12:07:51 -0700
Christoph Lameter <clameter@....com> wrote:

> Then there are some other flags. I am wondering why they are in
> GFP_LEVEL_MASK?
> 
> __GFP_COLD	Does not make sense for slab allocators since we have
> 		to touch the page immediately.
> 
> __GFP_COMP	No effect. Added by the page allocator on their own
> 		if a higher order allocs are used for a slab.
> 
> __GFP_MOVABLE	The movability of a slab is determined by the
> 		options specified at kmem_cache_create time. If this is
> 		specified at kmalloc time then we will have some random
> 		slabs movable and others not. 

Yes, they seem inappropriate.  Especially the first two.
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