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From: Ivan Voras <ivoras@freebsd.org>
Date: Sat, 2 Jun 2012 12:48:41 +0200
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To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Cc: freebsd-hackers@freebsd.org, Florian Smeets <flo@freebsd.org>,
	lev@freebsd.org
Subject: Re: SuperPages utilization survey
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On 2 June 2012 12:29, Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> wrote:
>>>
>>
>> In my words i would say "It enables mysql to use super-pages/large-pages".
>
> i asked the question wrong. the right should be "how does it do". Because i
> am not aware about any user level interface in FreeBSD to explicitly request
> superpage mapping.

You are right, there isn't any.

The code in mysqld.cc only works if HAVE_SOLARIS_LARGE_PAGES is defined:

3229 #endif /* HAVE_LARGE_PAGES */
3230 #ifdef HAVE_SOLARIS_LARGE_PAGES
3231 #define LARGE_PAGESIZE (4*1024*1024)  /* 4MB */
3232 #define SUPER_LARGE_PAGESIZE (256*1024*1024)  /* 256MB */
3233   if (opt_large_pages)
3234   {

...

3278   }
3279 #endif /* HAVE_SOLARIS_LARGE_PAGES */