taglinefilesource code
min_free_pages520fs/buffer.cwhile (nr_free_pages > min_free_pages*2 && needed > 0 &&
min_free_pages1590fs/buffer.cif (nr_free_pages > min_free_pages*2) 
min_free_pages127include/linux/mm.hextern int min_free_pages;
min_free_pages35mm/swap.cint min_free_pages = 20;
min_free_pages663mm/swap.creserved_pages = min_free_pages;
min_free_pages1038mm/swap.cmin_free_pages = i;