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.
true. anyway there should be such interface to freebsd kernel.
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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