diff options
Diffstat (limited to 'mysys/my_largepage.c')
| -rw-r--r-- | mysys/my_largepage.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/mysys/my_largepage.c b/mysys/my_largepage.c index 0fdc4e17a26..9cc1e19772b 100644 --- a/mysys/my_largepage.c +++ b/mysys/my_largepage.c @@ -251,6 +251,28 @@ int my_init_large_pages(my_bool super_large_pages) } +/** + Large page size helper. + This rounds down, if needed, the size parameter to the largest + multiple of an available large page size on the system. +*/ +void my_large_page_truncate(size_t *size) +{ + if (my_use_large_pages) + { + size_t large_page_size= 0; +#ifdef _WIN32 + large_page_size= my_large_page_size; +#elif defined(HAVE_MMAP) + int page_i= 0; + large_page_size= my_next_large_page_size(*size, &page_i); +#endif + if (large_page_size > 0) + *size-= *size % large_page_size; + } +} + + #if defined(HAVE_MMAP) && !defined(_WIN32) /* Solaris for example has only MAP_ANON, FreeBSD has MAP_ANONYMOUS and MAP_ANON but MAP_ANONYMOUS is marked "for compatibility" */ |