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    SubjectRe: [Fastboot] [RFC][PATCH] Add missing notifier before crashing
    On Fri, 02 Jun 2006 05:52:32 -0600 (Eric W. Biederman) wrote:

    > Preben Traerup <> writes:
    > > Since I'm one of the people who very much would like best of both worlds,
    > > I do belive Vivek Goyal's concern about the reliability of kdump must be
    > > adressed properly.
    > >
    > > I do belive the crash notifier should at least be a list of its own.
    > > Attaching element to the list proves your are kdump aware - in theory
    > >
    > > However:
    > >
    > > Conceptually I do not like the princip of implementing crash notifier
    > > as a list simply because for all (our) practical usage there will only
    > > be one element attached to the list anyway.
    > >
    > > And as I belive crash notifiers only will be used by a very limited
    > > number of users, I suggested in another mail that a simple
    > >
    > > if (function pointer)
    > > call functon
    > >
    > > approach to be used for this special case to keep things very simple.
    > I am completely against crash notifiers. The code crash_kexec switches to
    > is what is notified and it can do whatever it likes. The premise is
    > that the kernel does not work. Therefore we cannot safely notify
    > kernel code. We do the very minimal to get out of the kernel,
    > and it is my opinion we still do to much.
    > The crash_kexec entry point is not about taking crash dumps. It is
    > about implementing policy when the kernel panics. Generally the
    > policy we want is a crash dump but the mechanism is general purpose
    > and not limited to that.

    I understand it is more reliable that the notifier is executed
    by crash_kexec(). But I guess it take longer time than a clustering
    system demand and it is more complex to implement the notifier.
    The crash notifier I proposed is very simple and lightweight,
    and it is easy to use for all people.


    Akiyama, Nobuyuki

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