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    SubjectWhat was in the x86 merge for .20

    [The merge already made it to Linus' tree. Sorry for sending this message

    Most of this is for both i386 and x86-64, unless when noted

    These are just some high lights. As usual there are more
    smaller optimizations, cleanups etc

    - paravirt support for i386: the basic hooks for replacing all
    non virtualizable instructions on x86 are in. This currently
    only runs on native hardware, but will allow to link in
    modules for paravirtualized Xen/Vmware/lhype.
    There are some limitations like no SMP support yet.
    - Support for a Processor Data Area (PDA) on i386. This makes
    the code more similar to x86-64 and will allow some other
    optimizations in the future.
    - Relocatable kernel support for i386. This allows to load
    a single kernel binary on multiple addresses. This is useful
    to use kdump kernels without having to maintain separate
    - Sleazy FPU feature also supported now on i386 -- this will
    give a small improvement to FPU intensive programs because
    they have to do less lazy FPU exceptions.
    - When a spinlock lockup occurs print backtraces of all CPUs. This
    makes debugging deadlocks easier
    - x86-64 now also spins on spinlocks with interrupts enabled when
    - Various dwarf2 unwinder improvements.
    In particular better debugging support for figuring out what's wrong
    and the unwinder should be less likely to crash now when it finds
    invalid unwinding data.
    - Use more efficient cache flushing when cache attributes are changed
    - Allow compiling kernel for core2. To be really useful this
    will require gcc support to compile for core2 which isn't ready yet.
    - Various fixes to the MTRR code
    - Some preparatory infrastructure for perfmon
    - Improve TSC setup heuristics on Core2 and AMD K8
    - Don't try to synchronize TSCs on boot anymore. Instead just
    checks if they are synchronized or not and disable TSC use
    when unsynchronized.
    - More fixes to the idle notifier
    - Various other bug fixes and cleanups

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