On 2013年08月15日 16:51, Woody Wu wrote:
On Thu, Aug 15, 2013 at 10:41:39AM +0200, Belisko Marek wrote:
Hi,
On Thu, Aug 15, 2013 at 10:08 AM, Woody Wu<narkewoody@gmail.com> wrote:
Hi,
Near the end of kernel startup, there is a message 'Freeing init memory ..'. This process on embedded system takes several seconds. After searched kernel source, however, I cannot find the same literal text in all the .c files. rgrep 'Freeing' . on kernell source give me a lot of output. I believe you're looking on arm for that one: arch/arm/mm/init.c: printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
Yes, thank you very much! Now I want to disable the 'Freeing' behavior to reduce boot time, is there a kernel config or cmdline option? I am not sure if I can disable CONFIG_HIGHMEM to archive this purpose.
Why not bother to read the code? 712 void free_initmem(void) 713 { 714 #ifdef CONFIG_HAVE_TCM 715 extern char __tcm_start, __tcm_end; 716 717 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 718 __phys_to_pfn(__pa(&__tcm_end)), 719 "TCM link"); 720 #endif 721 722 if (!machine_is_integrator() && !machine_is_cintegrator()) 723 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 724 __phys_to_pfn(__pa(__init_end)), 725 "init"); 726 } 727 478 static inline int free_area(unsigned long pfn, unsigned long end, char *s) 479 { 480 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 481 482 for (; pfn < end; pfn++) { 483 struct page *page = pfn_to_page(pfn); 484 ClearPageReserved(page); 485 init_page_count(page); 486 __free_page(page); 487 pages++; 488 } 489 490 if (size && s) 491 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Does this really mean operations before the "Freeing init memory" cause the delay???? You want to bypass "Now I want to disable the 'Freeing' behavior", are you kidding? Please select printk timing the kernel hacking to find out where the delay actually lies.
So, I want to know, who was printing this message and
how can I disable the behavior to save some boot time since I don't care losting of several hundreds kilo bytes of memory.
Thanks in advance. woody
-- I can't go back to yesterday - because I was a different person then
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marek
-- as simple and primitive as possible ------------------------------------------------- Marek Belisko - OPEN-NANDRA Freelance Developer
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