Messages in this thread | | | Date | Wed, 19 Aug 2009 10:41:13 +0800 | From | Amerigo Wang <> | Subject | Re: [Patch 8/8] kexec: allow to shrink reserved memory |
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KAMEZAWA Hiroyuki wrote: > On Tue, 18 Aug 2009 18:35:32 +0800 > Amerigo Wang <amwang@redhat.com> wrote: > > >> KAMEZAWA Hiroyuki wrote: >> >>> On Tue, 18 Aug 2009 14:31:23 +0800 >>> Amerigo Wang <amwang@redhat.com> wrote: >>> >>> >>>>> It's hidden from the system before mem_init() ? >>>>> >>>>> >>>>> >>>> Not sure, but probably yes. It is reserved in setup_arch() which is >>>> before mm_init() which calls mem_init(). >>>> >>>> Do you have any advice to free that reserved memory after boot? :) >>>> >>>> >>>> >>> Let's see arch/x86/mm/init.c::free_initmem() >>> >>> Maybe it's all you want. >>> >>> - ClearPageReserved() >>> - init_page_count() >>> - free_page() >>> - totalram_pages++ >>> >>> >> Just FYI: calling ClearPageReserved() caused an oops: "Unable to handle >> paging request". >> >> I am trying to figure out why... >> >> > Hmm...then....memmap is not there. > pfn_valid() check will help you. What arch ? x86-64 ? >
Hmm, yes, x86_64, but this code is arch-independent, I mean it should work or not work on all arch, no?
So I am afraid we need to use other API to free it...
Thanks.
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