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    SubjectRe: [Patch 8/8] kexec: allow to shrink reserved memory
    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 ?

    Thanks,
    -Kame



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