Re: [PATCH] add __GFP_ZERO to GFP_LEVEL_MASK

[Christoph Lameter <clameter@sgi.com>]

On Mon, 23 Jul 2007, Peter Zijlstra wrote:

> ---
> Daniel recently spotted that __GFP_ZERO is not (and has never been)
> part of GFP_LEVEL_MASK. I could not find a reason for this in the
> original patch: 3977971c7f09ce08ed1b8d7a67b2098eb732e4cd in the -bk
> tree.
> 
> This of course is in stark contradiction with the comment accompanying
> GFP_LEVEL_MASK.

NACK.

The effect that this patch will have is that __GFP_ZERO is passed through 
to the page allocator which will needlessly zero pages. GFP_LEVEL_MASK is 
used to filter out the flags that are to be passed to the page allocator. 
__GFP_ZERO is not passed on but handled by the slab allocators.


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