[리눅스] min_free_kbytes 사이즈 공식(?)

int min_free_kbytes = 1024;
 
min_free_kbytes = sqrt(lowmem_kbytes * 16)
 
int __meminit init_per_zone_wmark_min(void)
{
        unsigned long lowmem_kbytes;
 
        lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10); 
 
        min_free_kbytes = int_sqrt(lowmem_kbytes * 16); 
        if (min_free_kbytes < 128) 
                min_free_kbytes = 128; 
        if (min_free_kbytes > 65536)
                min_free_kbytes = 65536;
        setup_per_zone_wmarks();
        refresh_zone_stat_thresholds();
        setup_per_zone_lowmem_reserve();
        setup_per_zone_inactive_ratio();
        return 0;
}