Re: [PATCH v5 09/11] thp: lazy huge zero page allocation

From: H. Peter Anvin
Date: Wed Dec 12 2012 - 16:47:56 EST

On 12/12/2012 01:30 PM, Andrew Morton wrote:
>> I can rewrite the check to static_key if you want. Would it be better?
> The new test-n-branch only happens on the first read fault against a
> thp huge page, yes? In which case it's a quite infrequent event and I
> suspect this isn't worth bothering about.

Not to mention that flipping the static key is *incredibly* expensive.


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