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Date: Tue, 19 Jun 2007 15:33:08 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
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To: Matt Mackall <mpm@selenic.com>
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       linux-mm@kvack.org, Pekka Enberg <penberg@cs.helsinki.fi>,
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Subject: Re: [patch 05/26] Slab allocators: Cleanup zeroing allocations
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On Tue, 19 Jun 2007, Matt Mackall wrote:

> I worry a bit about adding another branch checking __GFP_ZERO in such
> a hot path for SLAB/SLUB.

Its checking the gfpflags variable on the stack. In a recently touched 
cachline.