Messages in this thread | | | Date | Fri, 21 Aug 2009 09:59:27 +0800 | From | Amerigo Wang <> | Subject | Re: [Patch 8/8] kexec: allow to shrink reserved memory |
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On Fri, Aug 21, 2009 at 09:34:52AM +0900, KAMEZAWA Hiroyuki wrote: >On Thu, 20 Aug 2009 17:15:56 +0800 >Amerigo Wang <amwang@redhat.com> wrote: > >> > The, problem is whether memmap is there or not. That's all. >> > plz see init sequence and check there are memmap. >> > If memory-for-crash is obtained via bootmem, >> > Don't you try to free memory hole ? >> > >> >> Hi, >> >> It looks like that mem_map has 'struct page' for the reserved memory, I >> checked my "early_node_map[] active PFN ranges" output, the reserved >> memory area for crash kernel is right in one range. Am I missing >> something here? >> >> I don't know why that oops comes out, maybe because of no PTE for thoese >> pages? >> >Hmm ? Could you show me the code you use ?
(Sorry that I reply to you with my gmail, my work email can't send out this message, probably because one of the destinations is broken... I am the same person, don't be confused. :-)
Sure. Below is it:
+ for (addr = end + 1; addr < crashk_res.end; addr += PAGE_SIZE) { + printk(KERN_DEBUG "PFN is valid? %d\n", pfn_valid(addr>>PAGE_SHIFT)); + ClearPageReserved(virt_to_page(addr)); + init_page_count(virt_to_page(addr)); + free_page(addr); + totalram_pages++; + }
pfn_valid() returns 1, and oops happens at ClearPageReserved(). ('addr' is right between crashk_res.start and crashk_res.end)
Thank you!
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