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

H. Peter Anvin
2012-12-12T21:48:10Z

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.

-hpa