ref:

• Linux Available Memory

開機的 message:

Memory: 192820K/1046528K available (5182K kernel code, 490K rwdata, 1464K rodata, 320K init, 225K bss, 26316K reserved, 827392K cma-reserved)

是在 mm/page_alloc.c:

void __init mem_init_print_info(const char *str)
{
 ..
 ..
         pr_info("Memory: %luK/%luK available (%luK kernel code, %luK rwdata, %luK rodata, %luK init, %luK bss, %luK reserved, %luK cma-reserved"
#ifdef  CONFIG_HIGHMEM
                ", %luK highmem"
#endif
                "%s%s)\n",
                nr_free_pages() << (PAGE_SHIFT - 10),
                physpages << (PAGE_SHIFT - 10),
                codesize >> 10, datasize >> 10, rosize >> 10,
                (init_data_size + init_code_size) >> 10, bss_size >> 10,
                (physpages - totalram_pages() - totalcma_pages) << (PAGE_SHIFT - 10),
                totalcma_pages << (PAGE_SHIFT - 10),
#ifdef  CONFIG_HIGHMEM
                totalhigh_pages() << (PAGE_SHIFT - 10),
#endif
                str ? ", " : "", str ? str : "");