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    SubjectRe: [PATCH] Only reset e820 once, even with multiple memmap=exactmap params
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    On Thu, Jan 10, 2013 at 9:01 AM, Vivek Goyal <vgoyal@redhat.com> wrote:
    > On Thu, Jan 10, 2013 at 08:53:18AM -0800, Yinghai Lu wrote:
    >> On Thu, Jan 10, 2013 at 6:26 AM, Vivek Goyal <vgoyal@redhat.com> wrote:
    >> >
    >> > This happens only in case of kdump and not kexec. In case of kdump
    >> > we want second kernel to use only selected memory areas.
    >> >
    >> > In fact this is one improvement area. Instead of using memmap= entries
    >> > in kdump case, we should probably modify the e820 map passed in
    >> > zero page and get rid of memmap= entries.
    >>
    >> then how the kdump kernel get saved_max_pfn?
    >>
    >
    > Oh, I forgot about that. May be we can pass saved_max_pfn on command line
    > instead of passing all memmap= entries.

    then we create another kernel version/kexec tools dependency.

    kexec tools need to check kernel version, to see if saved_max_pfn= is supported.


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