Date: Sat, 2 Jun 2012 12:48:41 +0200 From: Ivan Voras <ivoras@freebsd.org> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: freebsd-hackers@freebsd.org, Florian Smeets <flo@freebsd.org>, lev@freebsd.org Subject: Re: SuperPages utilization survey Message-ID: <CAF-QHFUhOF=aW5Y2LRByH5wi%2BKsezMyrZuUL0w0AQCNweEGTaA@mail.gmail.com> In-Reply-To: <alpine.BSF.2.00.1206021228320.43360@wojtek.tensor.gdynia.pl> References: <jqac8f$6mn$1@dough.gmane.org> <1073159468.20120602121458@serebryakov.spb.ru> <4FC9D420.6010203@FreeBSD.org> <alpine.BSF.2.00.1206021054120.40882@wojtek.tensor.gdynia.pl> <4FC9D68D.60405@FreeBSD.org> <alpine.BSF.2.00.1206021228320.43360@wojtek.tensor.gdynia.pl>
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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 */
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